api_response_page_1.json

{
  "items" : [ {
    "tags" : [ "java", "swing" ],
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      "display_name" : "James Henderson",
      "link" : "https://stackoverflow.com/users/2152865/james-henderson"
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    "question_id" : 79839444,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79839444/java-resize-jframe-when-moving-to-new-screen",
    "title" : "Java - Resize JFrame When Moving to New Screen",
    "body" : "<p>I have two monitors with different resolutions. I would like for a <code>JFrame</code> to dynamically resize when dragged to a different monitor.  This has proven surprisingly difficult.</p>\n<p>Here is a reproducible example.<br />\nWhen dragging to a new frame, the label will update, but the frame will not change size.\nI've tried various combinations of revalidation, repainting, everything I can think of.</p>\n<p>Any help is appreciated.</p>\n<pre class=\"lang-java prettyprint-override\"><code>import javax.swing.JFrame;\nimport javax.swing.JLabel;\nimport javax.swing.SwingUtilities;\nimport java.awt.Dimension;\nimport java.awt.GraphicsDevice;\nimport java.awt.event.ComponentEvent;\nimport java.awt.event.ComponentListener;\n\npublic class ResizeTest extends JFrame {\n    private GraphicsDevice currentScreen;\n    public ResizeTest() {\n        currentScreen = getGraphicsConfiguration().getDevice();\n        JLabel screenLabel = new JLabel(currentScreen.getIDstring());\n        getContentPane().add(screenLabel);\n\n        addComponentListener(new ComponentListener() {\n\n            @Override\n            public void componentResized(ComponentEvent e) {}\n\n            @Override\n            public void componentMoved(ComponentEvent e) {\n                SwingUtilities.invokeLater(() -&gt; {\n                    GraphicsDevice newScreen = getGraphicsConfiguration().getDevice();\n                    if(!newScreen.equals(currentScreen)) {\n                        currentScreen = newScreen;\n                        screenLabel.setText(currentScreen.getIDstring());\n                        setSize(new Dimension(getWidth(), (int) (currentScreen.getDisplayMode().getHeight() * 0.8)));\n                        revalidate();\n                    }\n                });\n            }\n\n            @Override\n            public void componentShown(ComponentEvent e) {}\n\n            @Override\n            public void componentHidden(ComponentEvent e) {}\n        });\n    }\n\n    public static void main(String[] args) {\n        SwingUtilities.invokeLater(() -&gt; {\n            ResizeTest frame = new ResizeTest();\n            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);\n            frame.setSize(500, 500);\n            frame.revalidate();\n            frame.setLocationRelativeTo(null);\n            frame.setVisible(true);\n        });\n    }\n}\n</code></pre>\n"
  }, {
    "tags" : [ "java", "spring", "aop", "aspectj", "jdbi" ],
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      "display_name" : "Vaent",
      "link" : "https://stackoverflow.com/users/4620361/vaent"
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    "is_answered" : false,
    "view_count" : 16,
    "answer_count" : 0,
    "score" : 2,
    "last_activity_date" : 1764975961,
    "creation_date" : 1764975961,
    "question_id" : 79839373,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79839373/is-it-possible-to-inspect-method-invocations-on-a-jdbi-dao-using-aspect-oriented",
    "title" : "Is it possible to inspect method invocations on a JDBI DAO using aspect-oriented programming?",
    "body" : "<p>We mostly use <code>Jdbi.onDemand</code> with DAO interfaces to interact with our RDS.</p>\n<p>I'm trying to get visibility of when each DAO method is invoked.</p>\n<p>We have hundreds of methods across dozens of interfaces, so adding logs to every invocation individually is impractical.</p>\n<p>I was hoping to use an AOP advice based on JDBI annotations on the interface methods. We have <code>@annotation</code> advice for some controller methods, which works well, but the same approach isn't working for DAO methods.</p>\n<p>I suspect this is because both Spring AOP and JDBI work by creating proxy classes based on the interface, so that JDBI is able to get an instance and use it to interact with the database, but my aspect can't &quot;see&quot; that instance to apply the advice. I'm pretty new to this though and still getting my head round the details.</p>\n<p>Example code snippets (simplified):</p>\n<pre class=\"lang-java prettyprint-override\"><code>@Service\npublic class MyService {\n  private Jdbi jdbi;\n\n  public Long getCount() {\n    // MyDAO#getCount is invoked as expected\n    return jdbi.onDemand(MyDAO.class).getCount();\n  }\n}\n</code></pre>\n<pre class=\"lang-java prettyprint-override\"><code>public interface MyDAO {\n  @SqlQuery(&quot;SELECT COUNT(*) FROM myschema.mytable&quot;)\n  public Long getCount();\n}\n</code></pre>\n<pre class=\"lang-java prettyprint-override\"><code>@Aspect\n@Component\npublic class MyAspect {\n  @Before(&quot;@annotation(sqlQuery)&quot;)\n  public void queryAdvice(SqlQuery sqlQuery) {\n    // When the service method is invoked, I expect this to be printed, but nothing happens\n    System.out.println(&quot;Executing query: &quot; + sqlQuery.value());\n  }\n}\n</code></pre>\n<p>I've tried different advice types, different pointcut expressions including <code>bean</code> and <code>execution</code>, using a separate pointcut method, using a custom annotation instead of the JDBI one. Nothing I've tried seems to make any difference.</p>\n<p>Is there a workaround or a way to configure the aspect/interface so that JDBI's on-demand extension can interact with AspectJ/Spring AOP/any other aspect-oriented framework?</p>\n"
  }, {
    "tags" : [ "java", "spring-boot", "spring-mvc" ],
    "owner" : {
      "account_id" : 27077117,
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      "display_name" : "Udhayakumar T",
      "link" : "https://stackoverflow.com/users/20626843/udhayakumar-t"
    },
    "is_answered" : false,
    "view_count" : 23,
    "answer_count" : 0,
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    "last_activity_date" : 1764959198,
    "creation_date" : 1764959198,
    "question_id" : 79839208,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79839208/from-which-package-do-i-import-webmvctest-in-spring-boot-4-x",
    "title" : "From which package do I import @WebMvcTest in Spring Boot 4.x?",
    "body" : "<pre class=\"lang-java prettyprint-override\"><code>import org.junit.jupiter.api.BeforeEach;\nimport org.junit.jupiter.api.Test;\nimport org.springframework.beans.factory.annotation.Autowired;\nimport org.springframework.boot.webmvc.test.autoconfigure.WebMvcTest;\nimport org.springframework.http.MediaType;\nimport org.springframework.test.context.bean.override.mockito.MockitoBean;\nimport org.springframework.test.web.servlet.MockMvc;\n\nimport com.fasterxml.jackson.databind.ObjectMapper;\nimport com.fasterxml.jackson.databind.module.SimpleModule;\n\n@WebMvcTest(ProfSrchRestService.class)\nclass ProfSrchRestServiceUnitTest {\n    // test code\n}\n</code></pre>\n<p>VS code says:</p>\n<blockquote>\n<p>The import <code>org.springframework.boot.webmvc.test</code> cannot be resolved</p>\n</blockquote>\n<p>When I run the tests, I get the following:</p>\n<pre><code>[ERROR] TestEngine with ID 'junit-jupiter' failed to discover tests\n[INFO] \n[INFO] Results:\n[INFO]\n[INFO] Tests run: 0, Failures: 0, Errors: 0, Skipped: 0\n[INFO]\n[INFO] ------------------------------------------------------------------------\n[INFO] BUILD FAILURE\n[INFO] ------------------------------------------------------------------------\n[INFO] Total time:  01:21 min\n[INFO] Finished at: 2025-12-05T13:17:29+05:30\n[INFO] ------------------------------------------------------------------------\n[ERROR] Failed to execute goal org.apache.maven.plugins:maven-surefire-plugin:3.5.4:test (default-test) on project sdpco-cust-profile-search-svc:\n[ERROR]\n[ERROR] See C:\\Users\\UT001012134\\git\\4\\sdpco-cust-profile-search-svc\\target\\surefire-reports for the individual test results.\n[ERROR] See dump files (if any exist) [date].dump, [date]-jvmRun[N].dump and [date].dumpstream.\n[ERROR] There was an error in the forked process\n[ERROR] TestEngine with ID 'junit-jupiter' failed to discover tests\n[ERROR] org.apache.maven.surefire.booter.SurefireBooterForkException: There was an error in the forked process\n[ERROR] TestEngine with ID 'junit-jupiter' failed to discover tests\n[ERROR]         at org.apache.maven.plugin.surefire.booterclient.ForkStarter.fork(ForkStarter.java:631)  \n[ERROR]         at org.apache.maven.plugin.surefire.booterclient.ForkStarter.run(ForkStarter.java:285)   \n[ERROR]         at org.apache.maven.plugin.surefire.booterclient.ForkStarter.run(ForkStarter.java:250)   \n[ERROR]         at org.apache.maven.plugin.surefire.AbstractSurefireMojo.executeProvider(AbstractSurefireMojo.java:1337)\n[ERROR]         at org.apache.maven.plugin.surefire.AbstractSurefireMojo.executeAfterPreconditionsChecked(AbstractSurefireMojo.java:1135)\n[ERROR]         at org.apache.maven.plugin.surefire.AbstractSurefireMojo.execute(AbstractSurefireMojo.java:969)\n[ERROR]         at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:126)\n[ERROR]         at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute2(MojoExecutor.java:328)    \n[ERROR]         at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute(MojoExecutor.java:316)     \n[ERROR]         at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:212)       \n[ERROR]         at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:174)       \n[ERROR]         at org.apache.maven.lifecycle.internal.MojoExecutor.access$000(MojoExecutor.java:75)     \n[ERROR]         at org.apache.maven.lifecycle.internal.MojoExecutor$1.run(MojoExecutor.java:162)\n[ERROR]         at org.apache.maven.plugin.DefaultMojosExecutionStrategy.execute(DefaultMojosExecutionStrategy.java:39)\n</code></pre>\n<p>I used this as reference: <a href=\"https://docs.spring.io/spring-boot/api/java/org/springframework/boot/webmvc/test/autoconfigure/WebMvcTest.html\" rel=\"nofollow noreferrer\">https://docs.spring.io/spring-boot/api/java/org/springframework/boot/webmvc/test/autoconfigure/WebMvcTest.html</a></p>\n<p>My pom has:</p>\n<pre class=\"lang-xml prettyprint-override\"><code>&lt;dependency&gt;\n    &lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;\n    &lt;artifactId&gt;spring-boot-starter-webmvc&lt;/artifactId&gt;\n&lt;/dependency&gt;\n&lt;dependency&gt;\n    &lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;\n    &lt;artifactId&gt;spring-boot-starter-webmvc-test&lt;/artifactId&gt;\n    &lt;scope&gt;test&lt;/scope&gt;\n&lt;/dependency&gt;\n&lt;dependency&gt;\n    &lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;\n    &lt;artifactId&gt;spring-boot-starter-test&lt;/artifactId&gt;\n    &lt;scope&gt;test&lt;/scope&gt;\n&lt;/dependency&gt;\n&lt;dependency&gt;\n    &lt;groupId&gt;org.junit.jupiter&lt;/groupId&gt;\n    &lt;artifactId&gt;junit-jupiter-api&lt;/artifactId&gt;\n    &lt;version&gt;6.0.1&lt;/version&gt;\n    &lt;scope&gt;test&lt;/scope&gt;\n&lt;/dependency&gt;\n</code></pre>\n<p>Am I doing the import correctly?</p>\n"
  }, {
    "tags" : [ "java", "spring", "gradle", "boot" ],
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      "display_name" : "Al Harper",
      "link" : "https://stackoverflow.com/users/1430752/al-harper"
    },
    "is_answered" : false,
    "view_count" : 18,
    "answer_count" : 1,
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    "last_activity_date" : 1764962823,
    "creation_date" : 1764956361,
    "question_id" : 79839168,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79839168/gradle-does-not-add-the-correct-main-class-entry-in-the-manifest-mf-file",
    "title" : "Gradle does not add the correct main-class entry in the manifest.mf file",
    "body" : "<p>I have tried for days now to get the Gradle build to produce a Spring Boot jar file that will run. Everything builds ok except for one thing. Gradle does not put the correct main-class entry in the manifest.mf file. It puts:</p>\n<pre><code>Main-Class: org.springframework.boot.loader.JarLauncher\ninstead of:\nMain-Class: org.springframework.boot.loader.PropertiesLauncher\n</code></pre>\n<p>in the manifest file. No matter what I've tried so far that Gradle accepts as a properly formatted build.gradle file, will produce a manifest.mf file with that one entry that I need the PropertiesLauncher class.</p>\n<p>I've tried every example I could fine with Google in my build.gradle file. It builds fine but refuses to add the correct main-class entry in the manifest.</p>\n<p>If I manually add the main-class entry in the file and splice it back into the jar everything work fine. My program launches just fine and everything is great. This is a multi-project Gradle build.</p>\n<p>The following is my gutted build.gradle. There is some possible proprietary stuff in it, and delete hopefully unnecessary stuff. I'm hopping there is enough here for analysis. If more is needed I might have to cough up more info. Hopefully most of what's needed is in the bootJar task.</p>\n<pre><code>import java.text.SimpleDateFormat\n\nimport java.nio.file.Files;\nimport java.nio.file.Paths;\nimport java.nio.file.StandardCopyOption;\nimport java.nio.file.StandardCopyOption\n\nplugins {\n//    id 'org.springframework.boot' version '3.2.0'\n    id 'application'\n    id 'java'\n    alias(libs.plugins.springBootPlugin)\n//    alias(libs.plugins.springDependencyManagementPlugin)\n//    id 'org.springframework.boot' version '3.2.0' // Apply the Spring Boot plugin\n    id 'io.spring.dependency-management' version '1.1.4' // Recommended for managing Spring Boot dependencies\n}\n\napplication {\n    mainClass = 'org.springframework.boot.loader.PropertiesLauncher' \n}\n//mainClassName = 'org.springframework.boot.loader.PropertiesLauncher'\n\njava {\n  sourceCompatibility = JavaVersion.VERSION_1_8\n  targetCompatibility = JavaVersion.VERSION_1_8\n}\n\napply plugin: 'org.springframework.boot'\n\next{\n  group   = rootProject.properties.get('groupId')\n//  version = rootProject.properties.get('cupps.platform.version')\n}\n\nconfigurations {\n    wrapperservice\n}\n\next {\n}\n\ndependencies {\n            \n    // The following JMX stuff does not exist on Maven anymore.\n    // So we get them from maven-releases on our Nexus repository\n    implementation 'com.sun.jmx:jmxri:1.2.1'\n    implementation 'com.sun.jdmk:jmxtools:1.2.1'\n    implementation 'javax.management:jmxremote:1.0.1_04'\n}\n\ntasks.named(&quot;compileJava&quot;) {\n}\n\n// To disable the standard 'jar' task if you only want the bootJar\njar {\n    enabled = false\n}\n\n// Configuring the Main Class\n// https://docs.spring.io/spring-boot/docs/current/gradle-plugin/reference/htmlsingle/#packaging-executable.configuring.main-class\ntasks.named(&quot;bootJar&quot;) {\n\n    archiveFileName = &quot;${artifactId}-${project.property('cupps.platform.version')}.jar&quot; \n    println &quot;version2: &quot; + &quot;${artifactId}-${project.property('cupps.platform.version')}.jar&quot; \n\n    duplicatesStrategy = DuplicatesStrategy.EXCLUDE\n\n    //mainClassName = 'com.arinc.afd.cupps.Application'   // For Spring Boot Gradle Plugin version 2.6.x and above\n//    mainClassName = 'org.springframework.boot.loader.PropertiesLauncher' // For Spring Boot Gradle Plugin version 2.5.x and below\n\n    exclude ('**/batik*.*')\n    exclude ('**/service-wrapper.zip')\n    \n    // To include the properties files, conf files, and xml file, etc under the resources folder into the JAR file.\n    from sourceSets.main.resources\n\n// 'Main-Class': 'org.springframework.boot.loader.PropertiesLauncher'\n\n    manifest {\n        attributes (\n                'Start-Class' : 'com.arinc.afd.cupps.Application',\n                'Built-By' : &quot;${builtBy}&quot;,\n                'Build-Timestamp': new SimpleDateFormat(&quot;yyyy-MM-dd'T'HH:mm:ss.SSSZ&quot;).format(new Date()),\n                'Build-OS' : &quot;${System.properties['os.name']} ${System.properties['os.arch']} ${System.properties['os.version']}&quot;,\n                'Created-By' : &quot;${createdBy}&quot;,\n                'Specification-Title' : &quot;${specTitle}&quot;,\n                'Specification-Vendor' : &quot;${specVendor}&quot;,\n                'Specification-Version' : &quot;${specVersion}&quot;,\n                'Implementation-Title' : &quot;${implementTitle}&quot;,\n                'Implementation-Vendor' : &quot;${implementVendor}&quot;,\n                'Implementation-Version' : &quot;${implementVersion}&quot;,\n        )\n    }\n}\n\n</code></pre>\n"
  }, {
    "tags" : [ "java", "spring-boot", "mockito" ],
    "owner" : {
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      "reputation" : 11,
      "user_id" : 12195739,
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      "profile_image" : "https://lh3.googleusercontent.com/a-/AAuE7mAeLmW9XcQzHxvnxr8lzn-8SqbnNO6HxO5ydFp-5g=k-s256",
      "display_name" : "Roman Gajardo Robles",
      "link" : "https://stackoverflow.com/users/12195739/roman-gajardo-robles"
    },
    "is_answered" : false,
    "view_count" : 36,
    "answer_count" : 1,
    "score" : 1,
    "last_activity_date" : 1764959811,
    "creation_date" : 1764951052,
    "last_edit_date" : 1764957988,
    "question_id" : 79839094,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79839094/classcastexception-monovoid-unit-test-java",
    "title" : "ClassCastException Mono&lt;Void&gt; unit test Java",
    "body" : "<p>i have the method in springboot that consume a endpoint</p>\n<pre class=\"lang-java prettyprint-override\"><code>public Mono&lt;Void&gt; mesaVisadoCalculadoraNotificar(NotificarIn in) {\n        setTimeoutErrorCode(&quot;MVC-01&quot;);\n        return Mono.fromCallable(() -&gt; {\n            WebTarget path = target.path(MesaVisadoCalculadora.NOTIFICAR.getUri());\n            \n            return restHelper.performRequest(path, in, new GenericType&lt;Void&gt;(){}, HttpAction.POST);\n        });\n    }\n}\n</code></pre>\n<p>and this test</p>\n<pre class=\"lang-java prettyprint-override\"><code>@Test\npublic void mesavisadoCalculadoraNotificaTest(){\n    when(target.path(Mockito.anyString())).thenReturn(target);\n    when(restHelper.performRequest(Mockito.any(WebTarget.class), Mockito.any(), Mockito.any(GenericType.class),Mockito.any(HttpAction.class))).thenReturn(Mono.empty());\n\n    Mono&lt;Void&gt; promise = agent.mesaVisadoCalculadoraNotificar(in);\n    promise.block()\n    Assertions.assertNotNull(promise);\n   \n\n}\n</code></pre>\n<p>but in the line promise.block() return ClassCastException, any idea what it might be,</p>\n<p>this is a error in console:</p>\n<pre class=\"lang-none prettyprint-override\"><code>MesavisadoCalculadoraAgentTest &gt; mesavisadoCalculadoraNotificaTest() FAILED\n    java.lang.ClassCastException at MesavisadoCalculadoraAgentTest.java:65\n\njava.lang.ClassCastException: reactor.core.publisher.MonoIgnorePublisher cannot be cast to java.lang.Void\n    at infrastructure.agent.apimesavisadocalculadora.MesaVisadoCalculadoraAgent.lambda$mesaVisadoCalculadoraNotificar$0(MesaVisadoCalculadoraAgent.java:45)\n    at reactor.core.publisher.MonoCallable.block(MonoCallable.java:81)\n    at reactor.core.publisher.MonoCallable.block(MonoCallable.java:74)\n    at infrastructure.agent.apimesavisadocalculadora.MesavisadoCalculadoraAgentTest.mesavisadoCalculadoraNotificaTest(MesavisadoCalculadoraAgentTest.java:65)\n    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)\n    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)\n    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)\n    at java.lang.reflect.Method.invoke(Method.java:498)\n    at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:686)\n    at org.junit.jupiter.engine.execution.MethodInvocation.proceed(MethodInvocation.java:60)\n</code></pre>\n"
  }, {
    "tags" : [ "java", "mockito", "junit5", "jboss-arquillian", "payara-micro" ],
    "owner" : {
      "account_id" : 26036770,
      "reputation" : 42,
      "user_id" : 19742116,
      "user_type" : "registered",
      "profile_image" : "https://www.gravatar.com/avatar/0b8eb1099efac9225080681c728f5c64?s=256&d=identicon&r=PG&f=y&so-version=2",
      "display_name" : "Albert Albatros",
      "link" : "https://stackoverflow.com/users/19742116/albert-albatros"
    },
    "is_answered" : false,
    "view_count" : 20,
    "answer_count" : 0,
    "score" : 0,
    "last_activity_date" : 1764950125,
    "creation_date" : 1764950125,
    "question_id" : 79839079,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79839079/caused-by-java-lang-classnotfoundexception-org-mockito-internal-creation-byteb",
    "title" : "Caused by: java.lang.ClassNotFoundException: org.mockito.internal.creation.bytebuddy.inject.MockMethodDispatcher",
    "body" : "<p>I have integration tests configured in my project with payara-micro-managed, arquillian, and junit5. Everything works fine until I use Mockito. I get this error:</p>\n<pre><code>[2025-12-05T14:58:04.760+0000] [] [&amp;amp#27;[1;93mWARNING&amp;amp#27;[0m] [] [&amp;amp#27;[1;94mjakarta.enterprise.web&amp;amp#27;[0m] [tid: _ThreadID=77 _ThreadName=http-thread-pool::http-listener(1)] [timeMillis: 1764946684760] [levelValue: 900] [[\n  StandardWrapperValve[ArquillianServletRunnerEE9]: Servlet.service() for servlet ArquillianServletRunnerEE9 threw exception\norg.jboss.weld.exceptions.WeldException\n    at org.jboss.weld.module.ejb.SessionBeanProxyInstantiator.newInstance(SessionBeanProxyInstantiator.java:69)\n    at org.jboss.weld.module.ejb.SessionBeanImpl.create(SessionBeanImpl.java:157)\n    at org.jboss.weld.contexts.unbound.DependentContextImpl.get(DependentContextImpl.java:64)\n    at org.jboss.weld.bean.ContextualInstanceStrategy$DefaultContextualInstanceStrategy.get(ContextualInstanceStrategy.java:106)\n    at org.jboss.weld.bean.ContextualInstance.get(ContextualInstance.java:50)\n    at org.jboss.weld.manager.BeanManagerImpl.getReference(BeanManagerImpl.java:706)\n    at org.jboss.weld.manager.BeanManagerImpl.getInjectableReference(BeanManagerImpl.java:813)\n    at org.jboss.weld.injection.FieldInjectionPoint.inject(FieldInjectionPoint.java:93)\n    at org.jboss.weld.util.Beans.injectBoundFields(Beans.java:357)\n    at org.jboss.weld.util.Beans.injectFieldsAndInitializers(Beans.java:368)\n    at org.jboss.weld.injection.producer.ResourceInjector$1.proceed(ResourceInjector.java:70)\n    at org.glassfish.weld.services.InjectionServicesImpl.aroundInject(InjectionServicesImpl.java:245)\n    at org.jboss.weld.injection.InjectionContextImpl.run(InjectionContextImpl.java:47)\n    at org.jboss.weld.injection.producer.ResourceInjector.inject(ResourceInjector.java:72)\n    at org.jboss.weld.injection.producer.BasicInjectionTarget.inject(BasicInjectionTarget.java:126)\n    at org.jboss.weld.bean.ManagedBean.create(ManagedBean.java:165)\n    at org.jboss.weld.contexts.AbstractContext.get(AbstractContext.java:96)\n    at org.jboss.weld.bean.ContextualInstanceStrategy$DefaultContextualInstanceStrategy.get(ContextualInstanceStrategy.java:106)\n    at org.jboss.weld.bean.ContextualInstanceStrategy$CachingContextualInstanceStrategy.get(ContextualInstanceStrategy.java:192)\n    at org.jboss.weld.bean.ContextualInstance.get(ContextualInstance.java:50)\n    at org.jboss.weld.bean.proxy.ContextBeanInstance.getInstance(ContextBeanInstance.java:101)\n    at org.jboss.weld.bean.proxy.ProxyMethodHandler.getInstance(ProxyMethodHandler.java:136)\n    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:253)\n    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:211)\n    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:253)\n    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:211)\n    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:257)\n    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:166)\n    at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:757)\n    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:577)\n    at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99)\n    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:158)\n    at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:372)\n    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:239)\n    at com.sun.enterprise.v3.services.impl.ContainerMapper$HttpHandlerCallable.call(ContainerMapper.java:520)\n    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:217)\n    at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:174)\n    at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:153)\n    at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:196)\n    at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:88)\n    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:246)\n    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:178)\n    at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:118)\n    at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:96)\n    at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:51)\n    at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:510)\n    at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:82)\n    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:83)\n    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:101)\n    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:535)\n    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:515)\n    at java.base/java.lang.Thread.run(Thread.java:1583)\nCaused by: java.lang.reflect.InvocationTargetException\n    at java.base/jdk.internal.reflect.DirectConstructorHandleAccessor.newInstance(DirectConstructorHandleAccessor.java:74)\n    at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:502)\n    at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:486)\n    at org.jboss.weld.security.NewInstanceAction.run(NewInstanceAction.java:40)\n    at java.base/java.security.AccessController.doPrivileged(AccessController.java:571)\n    at org.jboss.weld.module.ejb.SessionBeanProxyInstantiator.newInstance(SessionBeanProxyInstantiator.java:55)\n    ... 55 more\nCaused by: java.lang.NoClassDefFoundError: org/mockito/internal/creation/bytebuddy/inject/MockMethodDispatcher\n    at java.base/jdk.internal.reflect.DirectConstructorHandleAccessor.newInstance(DirectConstructorHandleAccessor.java:62)\n    ... 60 more\nCaused by: java.lang.ClassNotFoundException: org.mockito.internal.creation.bytebuddy.inject.MockMethodDispatcher\n    ... 64 more\n</code></pre>\n<p>I don't understand why I get this error even though I have the mockito-core library.\nMy configuration looks like this:</p>\n<blockquote>\n<p>maven profile for building payara micro jar and running tests</p>\n</blockquote>\n<pre><code>    &lt;profile&gt;\n            &lt;id&gt;build-test-microbundle&lt;/id&gt;\n            &lt;build&gt;\n                &lt;plugins&gt;\n                    &lt;plugin&gt;\n                        &lt;groupId&gt;fish.payara.maven.plugins&lt;/groupId&gt;\n                        &lt;artifactId&gt;payara-micro-maven-plugin&lt;/artifactId&gt;\n                        &lt;executions&gt;\n                            &lt;execution&gt;\n                                &lt;id&gt;create-microbundle&lt;/id&gt;\n                                &lt;phase&gt;package&lt;/phase&gt;\n                                &lt;goals&gt;\n                                    &lt;goal&gt;bundle&lt;/goal&gt;\n                                &lt;/goals&gt;\n                            &lt;/execution&gt;\n                        &lt;/executions&gt;\n                        &lt;configuration&gt;\n                            &lt;payaraVersion&gt;${payaraVersion}&lt;/payaraVersion&gt;\n                            &lt;payaraMicroAbsolutePath&gt;\n                                target/microbundle.jar\n                            &lt;/payaraMicroAbsolutePath&gt;\n                            &lt;deployWar&gt;false&lt;/deployWar&gt;\n\n                            &lt;customJars&gt;\n                                &lt;artifactItem&gt;\n                                    &lt;groupId&gt;net.bytebuddy&lt;/groupId&gt;\n                                    &lt;artifactId&gt;byte-buddy-agent&lt;/artifactId&gt;\n                                &lt;/artifactItem&gt;\n                                &lt;artifactItem&gt;\n                                    &lt;groupId&gt;net.bytebuddy&lt;/groupId&gt;\n                                    &lt;artifactId&gt;byte-buddy&lt;/artifactId&gt;\n                                &lt;/artifactItem&gt;\n                                &lt;artifactItem&gt;\n                                    &lt;groupId&gt;org.mockito&lt;/groupId&gt;\n                                    &lt;artifactId&gt;mockito-core&lt;/artifactId&gt;\n                                &lt;/artifactItem&gt;\n                            &lt;/customJars&gt;\n                        &lt;/configuration&gt;\n                    &lt;/plugin&gt;\n                &lt;/plugins&gt;\n            &lt;/build&gt;\n        &lt;/profile&gt;\n        &lt;profile&gt;\n            &lt;id&gt;integration-test&lt;/id&gt;\n            &lt;build&gt;\n                &lt;plugins&gt;\n                    &lt;plugin&gt;\n                        &lt;groupId&gt;org.apache.maven.plugins&lt;/groupId&gt;\n                        &lt;artifactId&gt;maven-surefire-plugin&lt;/artifactId&gt;\n                        &lt;configuration&gt;\n                            &lt;systemPropertyVariables&gt;\n                                &lt;arquillian.launch&gt;payara-micro-managed&lt;/arquillian.launch&gt;\n                            &lt;/systemPropertyVariables&gt;\n                            &lt;includes&gt;\n                                &lt;include&gt;**/*IntegrationTest.java&lt;/include&gt;\n                            &lt;/includes&gt;\n                        &lt;/configuration&gt;\n                    &lt;/plugin&gt;\n                &lt;/plugins&gt;\n            &lt;/build&gt;\n        &lt;/profile&gt;\n</code></pre>\n<blockquote>\n<p>arquillian.xml</p>\n</blockquote>\n<pre><code>&lt;arquillian xmlns=&quot;http://jboss.org/schema/arquillian&quot;\n                        xmlns:xsi=&quot;http://www.w3.org/2001/XMLSchema-instance&quot;\n                        xsi:schemaLocation=&quot;http://jboss.org/schema/arquillian\n            http://jboss.org/schema/arquillian/arquillian_1_0.xsd&quot;&gt;\n\n    &lt;container qualifier=&quot;payara-micro-managed&quot; default=&quot;true&quot;&gt;\n        &lt;configuration&gt;\n            &lt;property name=&quot;microJar&quot;&gt;target/microbundle.jar&lt;/property&gt;\n            &lt;property name=&quot;autoBindHttp&quot;&gt;true&lt;/property&gt;\n            &lt;property name=&quot;clusterEnabled&quot;&gt;false&lt;/property&gt;\n\n        &lt;/configuration&gt;\n    &lt;/container&gt;\n&lt;/arquillian&gt;\n</code></pre>\n<blockquote>\n<p>@Deployment method</p>\n</blockquote>\n<pre><code>    @Deployment\n    public static WebArchive getArchive() {\n        WebArchive war = ShrinkWrap.create(WebArchive.class, &quot;test.war&quot;);\n        war.addPackages(true, &quot;com.example&quot;);\n        war.addAsLibraries(Maven.resolver()\n                .loadPomFromFile(&quot;pom.xml&quot;)\n                .importDependencies(ScopeType.COMPILE, ScopeType.TEST)\n                .resolve()\n                .withTransitivity()\n                .asFile());\n\n        return war;\n    }\n</code></pre>\n<blockquote>\n<p>Test</p>\n</blockquote>\n<pre><code>    @Test\n    public void testResolveActionWithoutRedirectNavigationParameters() {\n        Action action = Mockito.mock(Action.class);\n        assertNotNull(action);\n    }\n\n</code></pre>\n<blockquote>\n<p>Dependencies</p>\n</blockquote>\n<pre><code>        &lt;dependency&gt;\n            &lt;groupId&gt;org.mockito&lt;/groupId&gt;\n            &lt;artifactId&gt;mockito-core&lt;/artifactId&gt;\n            &lt;version&gt;5.15.2&lt;version&gt;\n        &lt;/dependency&gt;\n        &lt;dependency&gt;\n            &lt;groupId&gt;fish.payara.arquillian&lt;/groupId&gt;\n            &lt;artifactId&gt;arquillian-payara-micro-managed&lt;/artifactId&gt;\n            &lt;version&gt;4.0.alpha4&lt;/version&gt;\n            &lt;scope&gt;test&lt;/scope&gt;\n        &lt;/dependency&gt;\n        &lt;dependency&gt;\n            &lt;groupId&gt;org.jboss.arquillian.junit5&lt;/groupId&gt;\n            &lt;artifactId&gt;arquillian-junit5-container&lt;/artifactId&gt;\n            &lt;version&gt;1.7.0.Final&lt;/version&gt;\n            &lt;scope&gt;test&lt;/scope&gt;\n        &lt;/dependency&gt;\n        &lt;dependency&gt;\n            &lt;groupId&gt;org.jboss.arquillian.protocol&lt;/groupId&gt;\n            &lt;artifactId&gt;arquillian-protocol-servlet&lt;/artifactId&gt;\n            &lt;version&gt;1.7.0.Final&lt;/version&gt;\n            &lt;scope&gt;test&lt;/scope&gt;\n        &lt;/dependency&gt;\n</code></pre>\n<blockquote>\n<p>Im using payara 6.2025.11</p>\n</blockquote>\n"
  }, {
    "tags" : [ "java", "spring", "spring-boot", "apache-kafka", "spring-kafka" ],
    "owner" : {
      "account_id" : 16791300,
      "reputation" : 133,
      "user_id" : 12138892,
      "user_type" : "registered",
      "profile_image" : "https://lh4.googleusercontent.com/-ODgFgc7UbZs/AAAAAAAAAAI/AAAAAAAAAAA/ACHi3rdhwqpf7qo4hCZta5XwFE2nGRRB_A/s256-rj/photo.jpg",
      "display_name" : "Mykyta Piddubskiy",
      "link" : "https://stackoverflow.com/users/12138892/mykyta-piddubskiy"
    },
    "is_answered" : true,
    "view_count" : 28,
    "answer_count" : 1,
    "score" : 1,
    "last_activity_date" : 1764947235,
    "creation_date" : 1764944254,
    "question_id" : 79838989,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79838989/spring-boot-kafka-batching-for-all-partitions",
    "title" : "Spring boot Kafka batching for all partitions",
    "body" : "<p>I have Spring Boot with Kafka batching and a topic with 3 partitions. For example, I want to have 1 batch with 100 records continuously if I have a lot of messages in the topic, but if I have a low rate, then I want my app to send me a batch with 100 records or to wait 10 seconds and send me as big batch as possible.<br />\nRight now, I have the following properties in my test app (concurrency is 1):</p>\n<pre><code>fetch-min-size: 60_000\nfetch-max-wait: 10_000\nmax-poll-records: 100\n</code></pre>\n<p>And the problem is that if I have 1 partition, it works fine, but if I create a topic with 3 partitions, I start getting 3 small batches with a 10-second interval each. I assume that the listener listens for partitions separately and does not combine messages from them.<br />\nIs it possible to achieve it without the creation of a custom implementation of a listener to cache the responses, probably, and then divide them by batch size? Or are there other solutions?</p>\n<p>This property does not help since I use it for now, but it creates just a delay between polls, and in case of a big queue, I process very slowly.</p>\n<pre><code>idle-between-polls\n</code></pre>\n"
  }, {
    "tags" : [ "java", "javafx", "javafx-8" ],
    "owner" : {
      "account_id" : 10187542,
      "reputation" : 2677,
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      "profile_image" : "https://i.sstatic.net/NZSXm.jpg?s=256",
      "display_name" : "Sergey Zolotarev",
      "link" : "https://stackoverflow.com/users/20692967/sergey-zolotarev"
    },
    "is_answered" : true,
    "view_count" : 47,
    "answer_count" : 1,
    "score" : 1,
    "last_activity_date" : 1764968329,
    "creation_date" : 1764937122,
    "last_edit_date" : 1764954417,
    "question_id" : 79838872,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79838872/nested-javafx-services",
    "title" : "Nested JavaFX Services",
    "body" : "<p>Here's a simplistic form for &quot;saving&quot; DB connection settings.</p>\n<ol>\n<li>It has two fields: URL and password. Valid credentials are &quot;test&quot; and &quot;test&quot;.</li>\n<li>It has two buttons: &quot;Test connection&quot; and &quot;Save&quot;.</li>\n<li>&quot;Test connection&quot; attempts to connect using provided credentials (that is, imagine it does). If they are not, then the fields get outlined in red.</li>\n<li>&quot;Save&quot; first tests the connection and, if successful, saves the settings.</li>\n</ol>\n<p>Important: testing connection can be done clicking either button, but saving must be performed only on clicking &quot;Save&quot;.</p>\n<h1>Approach #1</h1>\n<p>I can declare two separate <code>Service</code>s. It means the saving listener is not activated on testing. However, the connection failure handling (red outlining) must either be duplicated in the save listener or be missing (in my MRE it's missing). In the real application, the testing functionality belongs to a child component's scope (imagine the testing button would be inside some container with a tiny spinner to boot that reflected the test status, for example). It would be a bit weird if my form would be nosing around in the child component's scope repeating the same failure handling.</p>\n<pre class=\"lang-java prettyprint-override\"><code>import javafx.application.Application;\nimport javafx.concurrent.Service;\nimport javafx.concurrent.WorkerStateEvent;\nimport javafx.css.PseudoClass;\nimport javafx.geometry.Insets;\nimport javafx.geometry.Pos;\nimport javafx.scene.Parent;\nimport javafx.scene.Scene;\nimport javafx.scene.control.Button;\nimport javafx.scene.control.Label;\nimport javafx.scene.control.TextField;\nimport javafx.scene.layout.Background;\nimport javafx.scene.layout.BackgroundFill;\nimport javafx.scene.layout.CornerRadii;\nimport javafx.scene.layout.GridPane;\nimport javafx.scene.layout.HBox;\nimport javafx.scene.paint.Color;\nimport javafx.scene.text.Font;\nimport javafx.stage.Stage;\n\nimport java.net.URL;\nimport java.time.Duration;\nimport java.util.Optional;\n\n\npublic class FXServiceDemo extends Application {\n\n    static TextField urlField;\n    static TextField passwordField;\n\n    @Override\n    public void start(Stage primaryStage) {\n        primaryStage.setScene(createScene());\n        primaryStage.setTitle(&quot;DB Settings&quot;);\n        primaryStage.show();\n    }\n\n    private Scene createScene() {\n        Parent root = createRoot();\n        Scene scene = new Scene(root);\n        findStylesheet().ifPresent(s -&gt; scene.getStylesheets().add(s));\n        return scene;\n    }\n\n    private static Optional&lt;String&gt; findStylesheet() {\n        URL nullableStylesheet = FXServiceDemo.class.getResource(&quot;/styles/styles.css&quot;);\n        Optional&lt;URL&gt; stylesheetOptional = Optional.ofNullable(nullableStylesheet);\n        return stylesheetOptional.map(URL::toExternalForm);\n    }\n\n    private Parent createRoot() {\n        GridPane root = new GridPane();\n        root.setAlignment(Pos.CENTER);\n        root.setPadding(new Insets(5));\n        root.hgapProperty().set(5);\n        root.vgapProperty().set(5);\n        Label header = new Label(&quot;DB settings&quot;);\n        header.setFont(Font.font(20));\n        root.add(header, 0, 0, 2, 1);\n        root.addRow(1, new Label(&quot;URL&quot;), urlField = new TextField());\n        root.addRow(2, new Label(&quot;Password&quot;), passwordField = new TextField());\n        root.add(createButtonRow(), 1, 3, 2, 1);\n        return root;\n    }\n\n    private HBox createButtonRow() {\n        HBox row = new HBox();\n        row.setSpacing(5);\n        row.setAlignment(Pos.CENTER_RIGHT);\n        row.getChildren().add(createTestConnectionButton());\n        row.getChildren().add(createSaveButton());\n        return row;\n    }\n\n    Service&lt;Void&gt; testConnectionService = Services.from(this::testConnection);\n    private Button createTestConnectionButton() {\n        Button button = new Button();\n        button.textProperty().set(&quot;Test Connection&quot;);\n        button.setOnAction(e -&gt; testConnectionService.restart());\n        button.disableProperty().bind(testConnectionService.runningProperty());\n        testConnectionService.addEventHandler(WorkerStateEvent.WORKER_STATE_SUCCEEDED, FXServiceDemo::onConnectionSuccess);\n        testConnectionService.addEventHandler(WorkerStateEvent.WORKER_STATE_FAILED, FXServiceDemo::onConnectionFailure);\n        return button;\n    }\n\n    private static void onConnectionSuccess(WorkerStateEvent e) {\n        setValid(true);\n        System.out.println(&quot;Connection was not established.&quot;);\n    }\n\n    private static void onConnectionFailure(WorkerStateEvent e) {\n        setValid(false);\n        System.out.println(&quot;Connection was not established.&quot;);\n    }\n\n    private static void setValid(boolean valid) {\n        PseudoClass invalid = PseudoClass.getPseudoClass(&quot;invalid&quot;);\n        urlField.pseudoClassStateChanged(invalid, !valid);\n        passwordField.pseudoClassStateChanged(invalid, !valid);\n    }\n\n    Service&lt;Void&gt; saveSettingsService = Services.from(this::saveSettings);\n    private Button createSaveButton() {\n        Button button = new Button();\n        button.textFillProperty().set(Color.WHITE);\n        button.backgroundProperty().set(new Background(new BackgroundFill(Color.GREEN, new CornerRadii(3), null)));\n        button.textProperty().set(&quot;Save&quot;);\n        button.setOnAction(e -&gt; saveSettingsService.restart());\n        button.disableProperty().bind(testConnectionService.runningProperty().or(saveSettingsService.runningProperty()));\n        saveSettingsService.addEventHandler(WorkerStateEvent.WORKER_STATE_SUCCEEDED, FXServiceDemo::onSaveSuccess);\n        saveSettingsService.addEventHandler(WorkerStateEvent.WORKER_STATE_FAILED, FXServiceDemo::onSaveFailure);\n        return button;\n    }\n\n    private static void onSaveSuccess(WorkerStateEvent e) {\n        System.out.println(&quot;Connection settings successfully saved.&quot;);\n    }\n\n    private static void onSaveFailure(WorkerStateEvent e) {\n        System.out.println(&quot;Connection settings could not saved.&quot;);\n    }\n\n    private void testConnection() {\n        System.out.println(&quot;Testing connection...&quot;);\n        sleep(Duration.ofSeconds(1));\n        if (credentialsValid()) return;\n        throw new IllegalArgumentException(&quot;Invalid Credentials&quot;);\n    }\n\n    private boolean credentialsValid() {\n        String correctUrl = &quot;test&quot;;\n        String correctPass = &quot;test&quot;;\n        return correctUrl.equals(urlField.textProperty().get()) &amp;&amp;\n                correctPass.equals(passwordField.textProperty().get());\n    }\n\n    private void saveSettings() {\n        testConnection();\n        System.out.println(&quot;Saving connection settings...&quot;);\n        sleep(Duration.ofSeconds(1));\n    }\n\n    private static void sleep(Duration duration) {\n        try {\n            Thread.sleep(duration.toMillis());\n        } catch (InterruptedException e) {\n            throw new RuntimeException(e);\n        }\n    }\n}\n</code></pre>\n<pre class=\"lang-none prettyprint-override\"><code>import javafx.concurrent.Service;\nimport javafx.concurrent.Task;\n\npublic class Services {\n\n    public static Service&lt;Void&gt; from(Runnable task) {\n        return new Service&lt;Void&gt;() {\n            @Override\n            protected Task&lt;Void&gt; createTask() {\n                return new Task&lt;Void&gt;() {\n                    @Override\n                    protected Void call() {\n                        task.run();\n                        return null;\n                    }\n                };\n            }\n        };\n    }\n}\n</code></pre>\n<pre class=\"lang-css prettyprint-override\"><code>/* resources/styles/styles.css */\n\n.text-field:invalid {\n    -fx-border-color : salmon;\n}\n</code></pre>\n<p><a href=\"https://i.sstatic.net/F0BDQRWV.png\" rel=\"nofollow noreferrer\"><img src=\"https://i.sstatic.net/F0BDQRWV.png\" alt=\"enter image description here\" /></a></p>\n<h1>Approach #2</h1>\n<p>I can declare one <code>Service</code>. Then failure handling will be executed no matter which button triggers it. However, testing connection will then notify the same saving listener (since listeners would also be shared). In effect, it would mean the testing button would be saving as well — unacceptable.</p>\n<h1>Approach #3</h1>\n<p><strong>(theoretical)</strong></p>\n<p>If I could:</p>\n<ol>\n<li>Declare two separate services.</li>\n<li>But have the saving service &quot;contain&quot; the lifecycle of the testing service.</li>\n</ol>\n<p>I could meet all of my requirements.</p>\n<p>However, it seems, I can't have nested <code>Service</code>s in JavaFX.</p>\n<h1>Approach #4</h1>\n<p><strong>(theoretical)</strong></p>\n<p>I could call some <code>restartAndThen(resultConsumer)</code> method that would register no additional listeners but execute a one-off callback on that particular invocation – the invocation performed by the saving button's action listener.</p>\n<p>Again, it's imaginary. No such API exists.</p>\n<p>How do I achieve my goals?</p>\n<p>Java 8.</p>\n"
  }, {
    "tags" : [ "java" ],
    "owner" : {
      "account_id" : 44916351,
      "reputation" : 1,
      "user_id" : 32003327,
      "user_type" : "registered",
      "profile_image" : "https://www.gravatar.com/avatar/3e767d39f71ec86b8b027b29e1235790?s=256&d=identicon&r=PG&f=y&so-version=2",
      "display_name" : "Prathap Reddy",
      "link" : "https://stackoverflow.com/users/32003327/prathap-reddy"
    },
    "is_answered" : false,
    "view_count" : 15,
    "closed_date" : 1764944421,
    "answer_count" : 0,
    "score" : -2,
    "last_activity_date" : 1764936879,
    "creation_date" : 1764936879,
    "question_id" : 79838871,
    "link" : "https://stackoverflow.com/questions/79838871/webclient-exception-pkix-path-building",
    "closed_reason" : "Not suitable for this site",
    "title" : "Webclient Exception : PKIX path building",
    "body" : "<p>pkix path building failed when i call target server API from java application code where target server gave me PEM and key and passphrase</p>\n"
  }, {
    "tags" : [ "java", "ssl", "ssl-certificate", "webclient", "x509" ],
    "owner" : {
      "account_id" : 17055723,
      "reputation" : 9,
      "user_id" : 12340316,
      "user_type" : "registered",
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      "display_name" : "Arpit Sharma",
      "link" : "https://stackoverflow.com/users/12340316/arpit-sharma"
    },
    "is_answered" : false,
    "view_count" : 45,
    "answer_count" : 3,
    "score" : 0,
    "last_activity_date" : 1764953119,
    "creation_date" : 1764930290,
    "question_id" : 79838766,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79838766/pkix-path-building-failed-unable-to-find-valid-certification-path-how-to-load",
    "title" : "PKIX path building failed: unable to find valid certification path — How to load PEM certificate into truststore at runtime in Spring Boot?",
    "body" : "<p>I am getting the below SSL error when my Java (Java 21, Spring Boot 3/4) application makes a REST call to a gateway:</p>\n<pre><code>Internal server error: (certificate_unknown) PKIX path building failed: \nsun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target\n</code></pre>\n<p>I already have the server certificate in a <code>.pem</code> file (X.509 certificate).<br />\nExample format:</p>\n<pre class=\"lang-none prettyprint-override\"><code>-----BEGIN CERTIFICATE-----\nMIIGmjCCBYKgAwIBAgIT...\n-----END CERTIFICATE-----\n</code></pre>\n<p>My Java application needs to trust this certificate when calling the Gateway.<br />\nThe Gateway requires certificate pinning — if the cert is not trusted, the request fails immediately.</p>\n<p>When my Java/Spring application starts:</p>\n<ol>\n<li><p><strong>Load this PEM certificate</strong> from <code>resources/certs/certificate.pem</code></p>\n</li>\n<li><p><strong>Add it to an in-memory truststore (JKS or PKCS12)</strong> at runtime</p>\n</li>\n<li><p><strong>Use that truststore for all outbound REST calls</strong> (WebClient / RestTemplate)</p>\n</li>\n<li><p>I do <em>not</em> want to modify the JVM default <code>cacerts</code>.</p>\n</li>\n<li><p>I want the application itself to load &amp; trust only the pinned certificate.</p>\n</li>\n</ol>\n<h3>What I have tried</h3>\n<p>I tried manually loading the cert:</p>\n<pre class=\"lang-java prettyprint-override\"><code>CertificateFactory cf = CertificateFactory.getInstance(&quot;X.509&quot;);\nX509Certificate cert = (X509Certificate) cf.generateCertificate(new FileInputStream(&quot;uidai_public.pem&quot;));\n</code></pre>\n<p>This loads successfully, but configuring it into SSLContext is failing.</p>\n<p>My WebClient configuration attempts:</p>\n<pre class=\"lang-java prettyprint-override\"><code>TrustManagerFactory tmf = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());\ntmf.init(myKeystore);\nSSLContext sslContext = SSLContext.getInstance(&quot;TLS&quot;);\nsslContext.init(null, tmf.getTrustManagers(), null);\n</code></pre>\n<p>But unless the certificate is in a real truststore file, Spring throws the same <code>PKIX path building failed</code>.</p>\n<h3>Question</h3>\n<p><strong>How do I correctly:</strong></p>\n<ul>\n<li><p>Load an X.509 PEM certificate inside <code>src/main/resources</code></p>\n</li>\n<li><p>Programmatically create an in-memory truststore</p>\n</li>\n<li><p>Register that truststore with <code>WebClient</code> (or <code>HttpClient</code>) so that only that certificate is trusted?</p>\n</li>\n<li><p>Ensure that calls to the Gateway no longer fail with PKIX errors?</p>\n</li>\n</ul>\n<h3>Constraints</h3>\n<ul>\n<li><p>Java 21</p>\n</li>\n<li><p>Spring Boot 3.4.x / 4.x</p>\n</li>\n<li><p>Certificate is a <code>.pem</code> file containing a full X.509 certificate (NOT a public key only)</p>\n</li>\n<li><p>Application runs inside a container, so I cannot manually modify <code>/etc/ssl/certs</code> or JVM <code>cacerts</code></p>\n</li>\n</ul>\n"
  }, {
    "tags" : [ "java", "compilation", "jvm", "dynamic-compilation" ],
    "owner" : {
      "account_id" : 44915103,
      "reputation" : 1,
      "user_id" : 32002554,
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      "profile_image" : "https://i.sstatic.net/vgiXro7C.jpg?s=256",
      "display_name" : "Basta Youssef",
      "link" : "https://stackoverflow.com/users/32002554/basta-youssef"
    },
    "is_answered" : false,
    "view_count" : 44,
    "answer_count" : 0,
    "score" : -1,
    "last_activity_date" : 1764928458,
    "creation_date" : 1764928458,
    "question_id" : 79838729,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79838729/jvm-escape-analysis-stack-allocation",
    "title" : "JVM – Escape Analysis &amp; Stack Allocation",
    "body" : "<p>How can I reliably determine whether the JVM is performing stack allocation through Escape Analysis for a specific object inside a hot method, and how can I verify it at runtime using JIT logs or JFR?</p>\n"
  }, {
    "tags" : [ "java", "circuit-breaker", "resilience4j" ],
    "owner" : {
      "account_id" : 44915104,
      "reputation" : 1,
      "user_id" : 32002555,
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      "profile_image" : "https://www.gravatar.com/avatar/95b8b5e4e10e3dd94b8d7e6ff1adedc9?s=256&d=identicon&r=PG&f=y&so-version=2",
      "display_name" : "Demotivational Speaker",
      "link" : "https://stackoverflow.com/users/32002555/demotivational-speaker"
    },
    "is_answered" : false,
    "view_count" : 19,
    "answer_count" : 0,
    "score" : 0,
    "last_activity_date" : 1764998348,
    "creation_date" : 1764928325,
    "last_edit_date" : 1764998348,
    "question_id" : 79838727,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79838727/circuitbreaker-is-going-to-open-state-from-closed-before-minimumnumberofcalls",
    "title" : "CircuitBreaker is going to OPEN state from CLOSED before minimumNumberOfCalls",
    "body" : "<p>I'm using custom configuration for the <code>CircuitBreaker</code>:</p>\n<pre class=\"lang-java prettyprint-override\"><code>CircuitBreakerConfig circuitBreakerConfig = CircuitBreakerConfig.custom()\n                                                                .failureRateThreshold(50)\n                                                                .slowCallDurationThreshold(60000)\n                                                                .permittedNumberOfCallsInHalfOpenState(5)\n                                                                .slidingWindowSize(10)\n                                                                .minimumNumberOfCalls(10)\n                                                                .build();\n</code></pre>\n<p>According the above code I should get <code>CallNotPermittedException</code> only after ten calls, but I'm getting at 6<sup>th</sup> call.<br />\nI've checked it's not <code>slowCall</code>.<br />\nFYI: I'm using Resilince4j 2.3.0, and its COUNT_BASED window.<br />\nWhat could be the reason ?</p>\n"
  }, {
    "tags" : [ "java", "spring", "spring-boot" ],
    "owner" : {
      "account_id" : 2314234,
      "reputation" : 261,
      "user_id" : 2031618,
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      "display_name" : "Bobby Akyong",
      "link" : "https://stackoverflow.com/users/2031618/bobby-akyong"
    },
    "is_answered" : true,
    "view_count" : 76,
    "closed_date" : 1765002740,
    "accepted_answer_id" : 79838749,
    "answer_count" : 1,
    "score" : 1,
    "last_activity_date" : 1764960843,
    "creation_date" : 1764926718,
    "last_edit_date" : 1764960843,
    "question_id" : 79838704,
    "link" : "https://stackoverflow.com/questions/79838704/spring-boot-4-x-need-manual-inject-for-objectmapper-jackson",
    "closed_reason" : "Not suitable for this site",
    "title" : "Spring Boot 4.x need manual inject for ObjectMapper Jackson?",
    "body" : "<p>Will Spring Boot 4 not inject a bean for Jackson automatically?</p>\n<p>I'm getting an error like this, given below:</p>\n<pre><code>\nAction:\n\nConsider defining a bean of type 'com.fasterxml.jackson.databind.ObjectMapper' in your configuration.\n\n\nProcess finished with exit code 0\n\n</code></pre>\n<p>I did configure the ObjectMapper Bean manually in my app for now:</p>\n<pre><code>   @Bean\n   public ObjectMapper objectMapper() {\n        return new ObjectMapper();\n   }\n</code></pre>\n<p>Take a look at <a href=\"https://github.com/akyong/SpringBoot4-MVC-MYSQL-cRUD/blob/main/src/main/java/com/bobbyakyong/spring_mvc_crud_mysql/SpringMvcCrudMysqlApplication.java\" rel=\"nofollow noreferrer\">Github</a></p>\n"
  }, {
    "tags" : [ "java", "sonarqube" ],
    "owner" : {
      "account_id" : 10465788,
      "reputation" : 13482,
      "user_id" : 7715250,
      "user_type" : "registered",
      "accept_rate" : 74,
      "profile_image" : "https://www.gravatar.com/avatar/4218136fceb989e7e6c1c7e549267b07?s=256&d=identicon&r=PG&f=y&so-version=2",
      "display_name" : "J. Doe",
      "link" : "https://stackoverflow.com/users/7715250/j-doe"
    },
    "is_answered" : false,
    "view_count" : 20,
    "closed_date" : 1764922250,
    "answer_count" : 0,
    "score" : -3,
    "last_activity_date" : 1764934733,
    "creation_date" : 1764920792,
    "last_edit_date" : 1764934733,
    "question_id" : 79838637,
    "link" : "https://stackoverflow.com/questions/79838637/turn-off-coverage-for-certain-lines-in-java",
    "closed_reason" : "Duplicate",
    "title" : "Turn off coverage for certain lines in Java",
    "body" : "<p>I am using SonarQube and this is in the report:</p>\n<p><img src=\"https://i.sstatic.net/4h8d1R1L.png\" alt=\"enter image description here\" /></p>\n<p>It doesn't make sense it shows that annotation in the first place. I tried turning the coverage off with configuration and adding the comments, like:</p>\n<pre class=\"lang-ini prettyprint-override\"><code>sonar.issue.ignore.block=e2\nsonar.issue.ignore.block.e2.beginBlockRegexp=@sonar-ignore\nsonar.issue.ignore.block.e2.endBlockRegexp=@end\n</code></pre>\n<p>That didn't work, below also doesn't work after adding it to a lombok.config file:</p>\n<pre class=\"lang-ini prettyprint-override\"><code>config.stopBubbling = true\nlombok.addLombokGeneratedAnnotation = true\n</code></pre>\n<p>Any suggestions? I have other blocks of code I also want to exclude. In the UI it doesn't seem like this is possible (my preference is in the code itself).</p>\n"
  }, {
    "tags" : [ "java", "android", "bluetooth", "hc-05" ],
    "owner" : {
      "account_id" : 44408219,
      "reputation" : 1,
      "user_id" : 31737120,
      "user_type" : "registered",
      "profile_image" : "https://i.sstatic.net/65YstSoB.png?s=256",
      "display_name" : "Claudiu",
      "link" : "https://stackoverflow.com/users/31737120/claudiu"
    },
    "is_answered" : false,
    "view_count" : 39,
    "answer_count" : 0,
    "score" : 0,
    "last_activity_date" : 1764920002,
    "creation_date" : 1764919909,
    "last_edit_date" : 1764920002,
    "question_id" : 79838627,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79838627/i-cannot-connect-to-my-hc-05-bluetooth-module-using-my-own-java-app",
    "title" : "I cannot connect to my HC-05 bluetooth module using my own Java app",
    "body" : "<p>I built a Java app where I implemented bluetooth functionality. Using the documentation I managed to discover devices and pair with them. I managed to get the whole device info (address, name), but it fails when I want to establish communication with the module.</p>\n<p><strong>In the ConnectThread constructor:</strong></p>\n<pre><code>if (ContextCompat.checkSelfPermission(context, Manifest.permission.BLUETOOTH_CONNECT) == PackageManager.PERMISSION_GRANTED) {\n            try {\n                tmp = device.createRfcommSocketToServiceRecord(UUID.fromString(&quot;00001101-0000-1000-8000-00805F9B34FB&quot;));\n            } catch (IOException e) {\n                Log.e(TAG, &quot;Socket's create() method failed&quot;, e);\n            }\n        } else {\n            Log.e(TAG, &quot;Missing BLUETOOTH_CONNECT permission&quot;);\n        }\n        targetSocket = tmp;\n</code></pre>\n<p><strong>In the ConnectThread method run():</strong></p>\n<pre><code>bluetoothAdapter.cancelDiscovery();\n\ntry {\n    targetSocket.connect();\n    Log.i(TAG, &quot;Connection successful!&quot;);\n} catch (IOException e) {\n    Log.d(TAG, Log.getStackTraceString(e));\n    Log.e(TAG, &quot;Could not connect; closing socket&quot;, e);\n    try {\n        targetSocket.close();\n    } catch (IOException e2) {\n        Log.e(TAG, &quot;Could not close the client socket&quot;, e2);\n    }\n}\n</code></pre>\n<p><strong>In the MainActivity, when I choose a device from the paired devices list:</strong></p>\n<pre><code>ConnectThread connectThread = new ConnectThread(device, mBluetoothManager, MainActivity.this);\nconnectThread.start();\n</code></pre>\n<p>**<br />\nWhat I have in my LOGCAT**</p>\n<pre><code>ConnectThread           com.example.carcontroller            D  java.io.IOException: read failed, socket might closed or timeout, read ret: -1\n                                                                                                        at android.bluetooth.BluetoothSocket.readAll(BluetoothSocket.java:1170)\n                                                                                                        at android.bluetooth.BluetoothSocket.readInt(BluetoothSocket.java:1188)\n                                                                                                        at android.bluetooth.BluetoothSocket.connect(BluetoothSocket.java:566)\n                                                                                                        at com.example.carcontroller.ConnectThread.run(ConnectThread.java:50)\nConnectThread           com.example.carcontroller            E  Could not connect; closing socket\n                                                                                                    java.io.IOException: read failed, socket might closed or timeout, read ret: -1\n                                                                                                        at android.bluetooth.BluetoothSocket.readAll(BluetoothSocket.java:1170)\n                                                                                                        at android.bluetooth.BluetoothSocket.readInt(BluetoothSocket.java:1188)\n                                                                                                        at android.bluetooth.BluetoothSocket.connect(BluetoothSocket.java:566)\n                                                                                                        at com.example.carcontroller.ConnectThread.run(ConnectThread.java:50)\n\n</code></pre>\n<p>Using the <strong><a href=\"https://play.google.com/store/apps/details?id=de.kai_morich.serial_bluetooth_terminal\" rel=\"nofollow noreferrer\">Serial Bluetooth Terminal</a></strong> from google play I managed to connect to my module and send data so I figure that the problem is on my end but I can't find any information about why this happens.</p>\n"
  }, {
    "tags" : [ "java", "concurrency", "javafx-8" ],
    "owner" : {
      "account_id" : 10187542,
      "reputation" : 2677,
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      "profile_image" : "https://i.sstatic.net/NZSXm.jpg?s=256",
      "display_name" : "Sergey Zolotarev",
      "link" : "https://stackoverflow.com/users/20692967/sergey-zolotarev"
    },
    "is_answered" : false,
    "view_count" : 25,
    "answer_count" : 1,
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    "last_activity_date" : 1764937440,
    "creation_date" : 1764919905,
    "last_edit_date" : 1764937440,
    "question_id" : 79838626,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79838626/binding-two-javafx-services-running-properties",
    "title" : "Binding two JavaFX services&#39; running properties",
    "body" : "<p>How do I bind the <code>running</code> property of one <code>Service</code> to the same <code>property</code> of another <code>Service</code> that it (re)starts? The first service must be considered running as long as the &quot;nested&quot; service is. In my simple demo, there's only one nested service, yet there could be more.</p>\n<p>The problematic part is <code>service.runningProperty()</code> does not return a <code>javafx.beans.property.Property</code> with a <code>bind()</code> method. It instead returns a <code>ReadOnlyBooleanProperty</code> that does not expose such a method.</p>\n<p>I could override <code>javafx.concurrent.Service#runningProperty</code> in a subclass to return <code>super.runningProperty().or(nestedRunningProperty())</code>, but the method is <code>final</code>, could not be overridden.</p>\n<p>I am hesitant to declare a separate property in my <code>Service</code> subclass (say, <code>effectiveRunningProperty()</code>). I don't want the service's clients to even know whether it has nested services. I am fine with declaring <code>myService.addAndWire(anotherService)</code>, on the other hand, if necessary (may be called by another client beforehand, not the one requesting/ binding to the <code>running</code> property).</p>\n<p>What is the best way to achieve my goal?</p>\n<p>Here's a demo that does <strong>not</strong> achieve it. Its idea is to keep the &quot;Start&quot; button disabled as long as the service, in its entirety, is running.</p>\n<pre class=\"lang-java prettyprint-override\"><code>import javafx.application.Application;\nimport javafx.concurrent.Service;\nimport javafx.geometry.Insets;\nimport javafx.geometry.Pos;\nimport javafx.scene.Scene;\nimport javafx.scene.control.Button;\nimport javafx.scene.layout.VBox;\nimport javafx.stage.Stage;\n\nimport java.time.Duration;\nimport java.util.function.Function;\n\n\npublic class FXServiceDemo extends Application {\n\n    @Override\n    public void start(Stage primaryStage) {\n        primaryStage.setScene(createScene());\n        primaryStage.setTitle(&quot;Service Demo&quot;);\n        primaryStage.show();\n    }\n\n    private Scene createScene() {\n        VBox root = createRoot();\n        Scene scene = new Scene(root);\n        return scene;\n    }\n\n    private VBox createRoot() {\n        VBox root = new VBox();\n        root.setAlignment(Pos.CENTER);\n        root.setPadding(new Insets(5));\n        root.getChildren().add(createStartButton());\n        return root;\n    }\n\n    private Button createStartButton() {\n        Service&lt;Void&gt; outerService = createOuterService(); // inner Service is not create in this scope\n        Button button = new Button();\n        button.textProperty().set(&quot;Start&quot;);\n        button.disableProperty().bind(outerService.runningProperty()); // button doesn't know there could be nested services\n        Function&lt;Boolean, String&gt; toWord = disable -&gt; disable ? &quot;DISABLED&quot; : &quot;ENABLED&quot;;\n        button.disableProperty().addListener((ob, ov, nv) -&gt; System.out.printf(&quot;Button was %s, but is now %s\\n&quot;, toWord.apply(ov), toWord.apply(nv)));\n        button.onActionProperty().setValue(e -&gt; outerService.restart());\n        return button;\n    }\n\n    private static Service&lt;Void&gt; createOuterService() {\n        Service&lt;Void&gt; service = Services.from(FXServiceDemo::perform);\n        return service;\n    }\n\n    private static void perform() {\n        System.out.println(&quot;Doing something before launching the nested Service...&quot;);\n        sleep(Duration.ofSeconds(1));\n        System.out.println(&quot;Launching the nested Service...&quot;);\n        startInnerService();\n    }\n\n    private static void startInnerService() {\n        Service&lt;Void&gt; service = createInnerService();\n        service.restart();\n    }\n\n    private static void sleep(Duration duration) {\n        try {\n            Thread.sleep(duration.toMillis());\n        } catch (InterruptedException e) {\n            throw new RuntimeException(e);\n        }\n    }\n\n    private static Service&lt;Void&gt; createInnerService() {\n        Service&lt;Void&gt; service = Services.from(FXServiceDemo::performNested);\n        return service;\n    }\n\n    private static void performNested() {\n        System.out.println(&quot;Doing something in the nested Service...&quot;);\n        sleep(Duration.ofSeconds(2));\n        System.out.println(&quot;Nested completed&quot;);\n    }\n}\n</code></pre>\n<pre class=\"lang-java prettyprint-override\"><code>import javafx.concurrent.Service;\nimport javafx.concurrent.Task;\n\npublic class Services {\n\n    public static Service&lt;Void&gt; from(Runnable task) {\n        return new Service&lt;Void&gt;() {\n            @Override\n            protected Task&lt;Void&gt; createTask() {\n                return new Task&lt;Void&gt;() {\n                    @Override\n                    protected Void call() {\n                        task.run();\n                        return null;\n                    }\n                };\n            }\n        };\n    }\n}\n</code></pre>\n<p>Once you run it and press the button, you get this console:</p>\n<pre><code>Button was ENABLED, but is now DISABLED \nDoing something before launching the nested Service...\nLaunching the nested Service...\nButton was DISABLED, but is now ENABLED \nDoing something in the nested Service...\nNested completed\n</code></pre>\n<p>Instead, it should be:</p>\n<pre><code>Button was ENABLED, but is now DISABLED \nDoing something before launching the nested Service...\nLaunching the nested Service...\nDoing something in the nested Service...\nNested completed\nButton was DISABLED, but is now ENABLED \n</code></pre>\n<p>Java 8.</p>\n"
  }, {
    "tags" : [ "java", "angular", "postgresql", "spring-boot" ],
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      "account_id" : 44913844,
      "reputation" : 1,
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      "display_name" : "Mlvin",
      "link" : "https://stackoverflow.com/users/32001765/mlvin"
    },
    "is_answered" : true,
    "view_count" : 58,
    "answer_count" : 2,
    "score" : 0,
    "last_activity_date" : 1764920569,
    "creation_date" : 1764918307,
    "last_edit_date" : 1764918883,
    "question_id" : 79838612,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79838612/risks-of-using-java-25-lts-versus-java-21-lts-in-a-new-spring-boot-backend",
    "title" : "Risks of using Java 25 LTS versus Java 21 LTS in a new Spring Boot backend",
    "body" : "<p>I’m starting an inventory system: multi-branch, reporting, invoicing, which I plan to maintain for several years.</p>\n<p>Tentative stack:\nBackend: Java + Spring Boot\nDB: PostgreSQL\nInterface: Angular 21</p>\n<p>But I have some doubts about versions:\nJava:</p>\n<p>Option A: Java 21 LTS + Spring Boot 3.5\nOption B: Java 25 LTS + Spring Boot 3.5 or 4</p>\n<p>PostgreSQL:\n16, 17 or even 18 for this new project.</p>\n<p>And I’d like to clarify a few questions about the following:</p>\n<p>For a new backend with Spring Boot, what risks do you see in using Java 25 LTS instead of Java 21 (library compatibility, tooling, stability) as of today?</p>\n<p>For PostgreSQL, what criteria would you use to choose between 16, 17 or 18 in a CRUD-intensive inventory system? Is there any strong reason to avoid any of these versions in production right now?</p>\n"
  }, {
    "tags" : [ "java", "gwt" ],
    "owner" : {
      "account_id" : 4830465,
      "reputation" : 207,
      "user_id" : 3898783,
      "user_type" : "registered",
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      "profile_image" : "https://www.gravatar.com/avatar/5461c373f57050efd35db91e0c0b3378?s=256&d=identicon&r=PG&f=y&so-version=2",
      "display_name" : "user3898783",
      "link" : "https://stackoverflow.com/users/3898783/user3898783"
    },
    "is_answered" : false,
    "view_count" : 23,
    "answer_count" : 0,
    "score" : 0,
    "last_activity_date" : 1764915584,
    "creation_date" : 1764915584,
    "question_id" : 79838587,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79838587/fields-are-not-showing-on-screen-after-upgrading-gwt-from-2-8-0-to-2-10-0-and-ja",
    "title" : "Fields are not showing on screen after upgrading gwt from 2.8.0 to 2.10.0 and java 8 to 10",
    "body" : "<p>Fields are not showing on screen after upgrading gwt from 2.8.0 to 2.10.0 and java 8 to 10.  org.dominokit:domino-ui -&gt; 1.0.7 and com.google.jsinterop:base -&gt; 1.0.0.</p>\n<pre><code>MaterialWidget widget = new MaterialWidget(Document.get().createDivElement());\n</code></pre>\n<p>The above widget not loading in screen.</p>\n"
  }, {
    "tags" : [ "java", "apache-kafka" ],
    "owner" : {
      "account_id" : 34107195,
      "reputation" : 1,
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      "display_name" : "Pallavi Ar",
      "link" : "https://stackoverflow.com/users/26388899/pallavi-ar"
    },
    "is_answered" : false,
    "view_count" : 17,
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    "question_id" : 79838557,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79838557/getting-duplicate-records-in-parquet-files-created-in-kafka-consumer",
    "title" : "Getting duplicate records In Parquet files created In Kafka Consumer",
    "body" : "<p>So when The consumer polls records after subscribing to kafka topic when the Very first parquet file created its has some offset entries but is creating a Huge file and when the next file created it has offset entries from previous files too so meaning that the latest File is having records from past entries why this duplicate records coming and until the batch is true we are not committing anything need solution to resolve the duplicate record issue</p>\n<p>Any Resolutions</p>\n<pre><code>try (KafkaConsumer&lt;byte[], String&gt; consumer = new KafkaConsumer&lt;byte[], String&gt;(props)) {       \n LOGGER.info(&quot;subscribing to kafka topic.&quot;);\n        consumer.subscribe(Arrays.asList(topic));\n\n        ConsumerRecords&lt;byte[], String&gt; records;\n        do {\n            LOGGER.info(&quot;polling new records from kafka stream.&quot;);\n            records = consumer.poll(Duration.ofMillis(10000));\n            LOGGER.info(&quot;{} records returned.&quot;, records.count());\n\n            for (ConsumerRecord&lt;byte[], String&gt; record : records) {\n                JsonObject jsonObject = JsonParser.parseString(record.value()).getAsJsonObject();\n                String payload = jsonObject.get(&quot;payload&quot;).getAsString();\n\n               \n                try (InputStream payloadIn = IOUtils.toInputStream(payload, StandardCharsets.US_ASCII)) {\n\n                    try (Base64InputStream base64In = new Base64InputStream(payloadIn)) {\n\n                        \n                        try (GZIPInputStream gzipIn = new GZIPInputStream(base64In)) {\n                            String xml = IOUtils.toString(gzipIn, StandardCharsets.UTF_8);\n\n                            writer.write(record.topic(), record.partition(), record.offset(), record.timestamp(), xml);\n                        }\n                    }\n                }\n            }\n\n            LOGGER.info(&quot;records processed.&quot;);\n\n            if (writer.endBatch()) {\n                LOGGER.info(&quot;batch closed.&quot;);\n                consumer.commitSync();\n                LOGGER.info(&quot;batch committed.&quot;);\n            }\n        } while(true);\n    }   \n\npublic boolean endBatch() throws IOException { if (this.writer != null) { Instant now = Instant.now(); Duration elapsed = Duration.between(this.firstRecordTimestamp, now); if ( (this.maxRecordsPerFile &gt; 0 &amp;&amp; (this.recordCount % this.maxRecordsPerFile) == 0) || (this.maxCollectionDuration.compareTo(Duration.ZERO) &gt; 0 &amp;&amp; (elapsed.compareTo(this.maxCollectionDuration) &gt;= 0)) ) { LOGGER.info(&quot;batch is complete either because of record limit or duration limit.&quot;); // the writer is full and should be closed. this.close(); return true; } }\n\n    return false;\n}  `\n</code></pre>\n"
  }, {
    "tags" : [ "java", "postgresql", "spring-boot", "hibernate", "testcontainers" ],
    "owner" : {
      "account_id" : 6099767,
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      "display_name" : "parsecer",
      "link" : "https://stackoverflow.com/users/4759176/parsecer"
    },
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    "answer_count" : 2,
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    "creation_date" : 1764898227,
    "question_id" : 79838482,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79838482/testcontainer-h2-is-still-used-in-test-domain-text-not-found",
    "title" : "Testcontainer: H2 is still used in test, Domain &quot;TEXT&quot; not found;",
    "body" : "<p>I have a very simple example: the entity uses <code>TEXT</code> column and the test fails because of it, despite using PostgreSQL testcontainer:</p>\n<p><strong>application-test.properties</strong></p>\n<pre><code>spring.datasource.url=jdbc:postgresql://localhost:5432/testdb   \nspring.datasource.username=postgres\nspring.datasource.password=postgres\nspring.jpa.hibernate.ddl-auto=create-drop\nspring.jpa.database-platform=org.hibernate.dialect.PostgreSQLDialect\nspring.jpa.show-sql=true\nspring.jpa.properties.hibernate.jdbc.batch_size=0\n</code></pre>\n<p><strong>Dog.java</strong>:</p>\n<pre class=\"lang-java prettyprint-override\"><code>@Entity\n@Getter\n@Setter\npublic class Dog {\n    @Id\n    @SequenceGenerator(name = &quot;dog_sequence&quot;,\n            sequenceName = &quot;dog_sequence&quot;,\n            allocationSize = 1)\n    @GeneratedValue(strategy = GenerationType.SEQUENCE,\n            generator = &quot;dog_sequence&quot;)\n    private Long id;\n\n    @Column\n    private String name;\n    @Column(columnDefinition = &quot;TEXT&quot;)\n    private String description;\n\n}\n</code></pre>\n<p><strong>DogRepository.java</strong>:</p>\n<pre class=\"lang-java prettyprint-override\"><code>public interface DogRepository extends JpaRepository&lt;Dog, Long&gt; {}\n</code></pre>\n<p><strong>DogTest.java</strong>:</p>\n<pre class=\"lang-java prettyprint-override\"><code>@Testcontainers\n@DataJpaTest\n@ActiveProfiles(&quot;test&quot;)\npublic class DogTest {\n    @Container\n    static PostgreSQLContainer&lt;?&gt; postgres = new PostgreSQLContainer&lt;&gt;(&quot;postgres:15.4&quot;)\n            .withDatabaseName(&quot;testdb&quot;)\n            .withUsername(&quot;postgres&quot;)\n            .withPassword(&quot;postgres&quot;);\n\n    @DynamicPropertySource\n    static void overrideProperties(DynamicPropertyRegistry registry) {\n        registry.add(&quot;spring.datasource.url&quot;, postgres::getJdbcUrl);\n        registry.add(&quot;spring.datasource.username&quot;, postgres::getUsername);\n        registry.add(&quot;spring.datasource.password&quot;, postgres::getPassword);\n        registry.add(&quot;spring.datasource.driver-class-name&quot;, postgres::getDriverClassName);\n        registry.add(&quot;spring.jpa.hibernate.ddl-auto&quot;, () -&gt; &quot;create-drop&quot;);\n        registry.add(&quot;spring.jpa.database-platform&quot;, () -&gt; &quot;org.hibernate.dialect.PostgreSQLDialect&quot;);\n    }\n\n\n    @Autowired\n    private DogRepository repository;\n\n    @Autowired\n    private TestEntityManager entityManager;\n\n\n    @Before\n    public void setUp() {\n        for (int i = 0; i &lt; 10; i++) {\n            Dog dog = new Dog();\n            entityManager.persist(dog);\n        }\n\n        entityManager.flush();\n    }\n\n\n    @Test\n    public void testFindDogs() {\n        List&lt;Dog&gt; dogs = repository.findAll();\n        Assertions.assertEquals(1, dogs.size());\n\n    }\n}\n</code></pre>\n<p>When I run the test I get the error:</p>\n<pre><code>Hibernate: \n    create table &quot;dog&quot; (\n        &quot;id&quot; bigint not null,\n        &quot;description&quot; &quot;TEXT&quot;,\n        &quot;name&quot; varchar(255),\n        primary key (&quot;id&quot;)\n    )\n2025-12-04T20:27:04.096-05:00  WARN 560907 --- [           main] o.h.t.s.i.ExceptionHandlerLoggedImpl     : GenerationTarget encountered exception accepting command : Error executing DDL &quot;\n    create table &quot;dog&quot; (\n        &quot;id&quot; bigint not null,\n        &quot;description&quot; &quot;TEXT&quot;,\n        &quot;name&quot; varchar(255),\n        primary key (&quot;id&quot;)\n    )&quot; via JDBC [Domain &quot;TEXT&quot; not found;]\n\norg.hibernate.tool.schema.spi.CommandAcceptanceException: Error executing DDL &quot;\n    create table &quot;dog&quot; (\n        &quot;id&quot; bigint not null,\n        &quot;description&quot; &quot;TEXT&quot;,\n        &quot;name&quot; varchar(255),\n        primary key (&quot;id&quot;)\n    )&quot; via JDBC [Domain &quot;TEXT&quot; not found;]\n</code></pre>\n<p>From what I understand, <code>TEXT</code> is not used by <code>H2</code>, however works with <code>PostgreSQL</code>. It should work with PostgreSQL testcontainer, yet it doesn't, so it seems like the test is still using <code>H2</code>, and I don't see why.</p>\n<p>How do I make the test run without removing <code>TEXT</code> column type?</p>\n"
  }, {
    "tags" : [ "java", "swing", "inputverifier" ],
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      "display_name" : "J&#246;rg",
      "link" : "https://stackoverflow.com/users/8368531/j%c3%b6rg"
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    "question_id" : 79838436,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79838436/swing-tutorial-inputverifier-setup",
    "title" : "Swing tutorial: InputVerifier setup",
    "body" : "<p>Below you find the example code for an <a href=\"https://docs.oracle.com/javase/tutorial/displayCode.html?code=https://docs.oracle.com/javase/tutorial/uiswing/examples/misc/InputVerificationDialogDemoProject/src/misc/InputVerificationDialogDemo.java\" rel=\"nofollow noreferrer\">InputVerifier from the swing tutorial</a>, slightly modified to compile error-free under java 25.\nThe code creates an InputVerifer (<code>class MyVerifier</code>), which is set to the four JTextFields. Nowhere in the code the InputVerifier is &quot;removed&quot; (set to null), but in its <code>shouldYieldFocus(...)</code> method it is set anew with every verification (<code>input.setInputVerifier(this)</code>). Commenting out this line shows no different behaviour on my side. So is this line at least recommendable or maybe even necessary for reasons I cannot figure out?</p>\n<pre><code>//package misc;\n \nimport java.util.Set;\nimport java.util.HashSet;\n \nimport java.awt.*;\nimport java.awt.event.*;\n \nimport javax.swing.*;\nimport javax.swing.event.*;\nimport javax.swing.text.*;\n \nimport java.beans.PropertyChangeListener;\nimport java.beans.PropertyChangeEvent;\n \nimport java.text.*;\n \n/**\n * InputVerificationDialogDemo.java is a 1.4 example that\n * requires no other files.\n *\n * Yet another mortgage calculator.\n * However, instead of using a formatted text field,\n * as shown in FormattedTextFieldDemo, this example\n * uses input verification to validate user input.\n * This one uses a dialog to warn people when their input is bad.\n */\npublic class InputVerificationDialogDemo extends JPanel {\n    //Default values\n    private static double DEFAULT_AMOUNT = 100000;\n    private static double DEFAULT_RATE = 7.5;  //7.5 %\n    private static int DEFAULT_PERIOD = 30;\n \n    //Labels to identify the text fields\n    private JLabel amountLabel;\n    private JLabel rateLabel;\n    private JLabel numPeriodsLabel;\n    private JLabel paymentLabel;\n \n    //Strings for the labels\n    private static String amountString = &quot;Loan Amount (10,000 - 10,000,000): &quot;;\n    private static String rateString = &quot;APR (&gt;= 0%): &quot;;\n    private static String numPeriodsString = &quot;Years (1-40): &quot;;\n    private static String paymentString = &quot;Monthly Payment: &quot;;\n \n    //Text fields for data entry\n    private JTextField amountField;\n    private JTextField rateField;\n    private JTextField numPeriodsField;\n    private JTextField paymentField;\n \n    //Formats to format and parse numbers\n    private NumberFormat moneyFormat;\n    private NumberFormat percentFormat;\n    private DecimalFormat decimalFormat;\n    private DecimalFormat paymentFormat;\n    private NumberFormat integerFormat;\n    private MyVerifier verifier = new MyVerifier();\n \n    public InputVerificationDialogDemo() {\n        super(new BorderLayout());\n        setUpFormats();\n        double payment = computePayment(DEFAULT_AMOUNT,\n                                        DEFAULT_RATE,\n                                        DEFAULT_PERIOD);\n \n        //Create the labels.\n        amountLabel = new JLabel(amountString);\n        rateLabel = new JLabel(rateString);\n        numPeriodsLabel = new JLabel(numPeriodsString);\n        paymentLabel = new JLabel(paymentString);\n \n        //Create the text fields and set them up.\n        amountField = new JTextField(moneyFormat.format(DEFAULT_AMOUNT), 10);\n        amountField.setInputVerifier(verifier);\n \n        rateField = new JTextField(percentFormat.format(DEFAULT_RATE), 10);\n        rateField.setInputVerifier(verifier);\n \n        numPeriodsField = new JTextField(decimalFormat.format(DEFAULT_PERIOD), 10);\n        numPeriodsField.setInputVerifier(verifier);\n \n        paymentField = new JTextField(paymentFormat.format(payment), 10);\n        paymentField.setInputVerifier(verifier);\n        paymentField.setEditable(false);\n        //Remove this component from the focus cycle.\n        paymentField.setFocusable(false); \n        paymentField.setForeground(Color.red);\n \n        //Register an action listener to handle Return.\n        amountField.addActionListener(verifier);\n        rateField.addActionListener(verifier);\n        numPeriodsField.addActionListener(verifier);\n \n        //Tell accessibility tools about label/textfield pairs.\n        amountLabel.setLabelFor(amountField);\n        rateLabel.setLabelFor(rateField);\n        numPeriodsLabel.setLabelFor(numPeriodsField);\n        paymentLabel.setLabelFor(paymentField);\n \n        //Lay out the labels in a panel.\n        JPanel labelPane = new JPanel(new GridLayout(0,1));\n        labelPane.add(amountLabel);\n        labelPane.add(rateLabel);\n        labelPane.add(numPeriodsLabel);\n        labelPane.add(paymentLabel);\n \n        //Layout the text fields in a panel.\n        JPanel fieldPane = new JPanel(new GridLayout(0,1));\n        fieldPane.add(amountField);\n        fieldPane.add(rateField);\n        fieldPane.add(numPeriodsField);\n        fieldPane.add(paymentField);\n \n        //Put the panels in this panel, labels on left,\n        //text fields on right.\n        setBorder(BorderFactory.createEmptyBorder(20, 20, 20, 20));\n        add(labelPane, BorderLayout.CENTER);\n        add(fieldPane, BorderLayout.LINE_END);\n    }\n \n    class MyVerifier extends InputVerifier \n                     implements ActionListener {\n        double MIN_AMOUNT = 10000.0;\n        double MAX_AMOUNT = 10000000.0;\n        double MIN_RATE = 0.0;\n        int MIN_PERIOD = 1;\n        int MAX_PERIOD = 40;\n        String message = null;\n \n        public boolean shouldYieldFocus(JComponent input, JComponent target) {\n            boolean inputOK = verify(input);\n            makeItPretty(input);\n            updatePayment();\n \n            if (inputOK) {\n                return true;\n            }\n \n \n            //Beep and then tell whoever called us that we don't\n            //want to yield focus.\n            Toolkit.getDefaultToolkit().beep();\n            //Pop up the message dialog.\n            message += &quot;.\\nPlease try again.&quot;;\n            JOptionPane.showMessageDialog(null, //no owner frame\n                                          message, //text to display\n                                          &quot;Invalid Value&quot;, //title\n                                          JOptionPane.WARNING_MESSAGE);\n// vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv\n            //Reinstall the input verifier. - - WHY??\n//            input.setInputVerifier(this);\n// ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n \n/* Following lines moved up, to beep with the error message, not after closing the OptionPane.\n            //Beep and then tell whoever called us that we don't\n            //want to yield focus.\n            Toolkit.getDefaultToolkit().beep();\n*/\n            return false;\n        }\n \n        protected void updatePayment() {\n            double amount = DEFAULT_AMOUNT;\n            double rate = DEFAULT_RATE;\n            int numPeriods = DEFAULT_PERIOD;\n            double payment = 0.0;\n \n            //Parse the values.\n            try {\n                amount = moneyFormat.parse(amountField.getText()).\n                                 doubleValue();\n            } catch (ParseException pe) {}\n            try {\n                rate = percentFormat.parse(rateField.getText()).\n                                 doubleValue();\n            } catch (ParseException pe) {}\n            try {\n                numPeriods = decimalFormat.parse(numPeriodsField.getText()).\n                    intValue();\n            } catch (ParseException pe) {}\n \n            //Calculate the result and update the GUI.\n            payment = computePayment(amount, rate, numPeriods);\n            paymentField.setText(paymentFormat.format(payment));\n        }\n \n        //This method checks input, but should cause no side effects.\n        public boolean verify(JComponent input) {\n            return checkField(input, false);\n        }\n \n        protected void makeItPretty(JComponent input) {\n            checkField(input, true);\n        }\n \n        protected boolean checkField(JComponent input, boolean changeIt) {\n            if (input == amountField) {\n                return checkAmountField(changeIt);\n            } else if (input == rateField) {\n                return checkRateField(changeIt);\n            } else if (input == numPeriodsField) {\n                return checkNumPeriodsField(changeIt);\n            } else {\n                return true; //shouldn't happen\n            }\n        }\n \n        //Checks that the amount field is valid.  If it is valid,\n        //it returns true, otherwise it sets the message field and\n        //returns false.  If the change argument is true,  set\n        //the textfield to the parsed number so that it looks\n        //good -- no letters, for example.\n        public boolean checkAmountField(boolean change) {\n            boolean wasValid = true;\n            double amount = DEFAULT_AMOUNT;\n \n            //Parse the value.\n            try {\n                amount = moneyFormat.parse(amountField.getText()).\n                                     doubleValue();\n            } catch (ParseException pe) {\n                message = &quot;Invalid money format in Loan Amount field&quot;;\n                return false;\n            }\n \n            //Value was invalid.\n            if ((amount &lt; MIN_AMOUNT) || (amount &gt; MAX_AMOUNT)) {\n                wasValid = false;\n                if (amount &lt; MIN_AMOUNT) {\n                    message = &quot;Loan Amount was &lt; &quot;\n                              + integerFormat.format(MIN_AMOUNT);\n                } else { //amount is greater than MAX_AMOUNT\n                    message = &quot;Loan Amount was &gt; &quot;\n                              + integerFormat.format(MAX_AMOUNT);\n                }\n            }\n \n            //Whether value was valid or not, format it nicely.\n            if (change) {\n                amountField.setText(moneyFormat.format(amount));\n                amountField.selectAll();\n            }\n        return wasValid;\n        }\n \n        //Checks that the rate field is valid.  If it is valid,\n        //it returns true, otherwise it sets the message field and\n        //returns false. If the change argument is true, set the\n        //textfield to the parsed number so that it looks good -- no \n        //letters, for example.\n        public boolean checkRateField(boolean change) {\n            boolean wasValid = true;\n            double rate = DEFAULT_RATE;\n \n            //Parse the value.\n            try {\n                rate = percentFormat.parse(rateField.getText()).\n                                     doubleValue();\n            } catch (ParseException pe) {\n                message = &quot;Invalid percent format in APR field&quot;;\n                return false;\n            }\n \n            //Value was invalid.\n            if (rate &lt; MIN_RATE) {\n                wasValid = false;\n                message = &quot;Bad value: APR was &lt; &quot; + MIN_RATE;\n            }\n \n            //Whether value was valid or not, format it nicely.\n            if (change) {\n                rateField.setText(percentFormat.format(rate));\n                rateField.selectAll();\n            }\n \n            return wasValid;\n        }\n     \n        //Checks that the numPeriods field is valid.  If it is valid,\n        //it returns true, otherwise it sets the message field and\n        //returns false. If the change argument is true, set the \n        //textfield to the parsed number so that it looks good -- no\n        //letters, for example.\n        public boolean checkNumPeriodsField(boolean change) {\n            boolean wasValid = true;\n            int numPeriods = DEFAULT_PERIOD;\n \n            //Parse the value.\n            try {\n                numPeriods = decimalFormat.parse(numPeriodsField.getText()).\n                                           intValue();\n            } catch (ParseException pe) {\n                message = &quot;Invalid decimal format in Years field&quot;;\n                return false;\n            }\n           \n            //Value was invalid.\n            if (numPeriods &lt; MIN_PERIOD) {\n                wasValid = false;\n                message = &quot;Bad value: Number of years was &lt; &quot;\n                          + integerFormat.format(MIN_PERIOD);\n            } else if (numPeriods &gt; MAX_PERIOD) {\n                wasValid = false;\n                message = &quot;Bad value: Number of years was &gt; &quot;\n                          + integerFormat.format(MAX_PERIOD);\n            }\n \n            //Whether value was valid or not, format it nicely.\n            if (change) {\n                numPeriodsField.setText(decimalFormat.format(numPeriods));\n                numPeriodsField.selectAll();\n            }\n \n            return wasValid;\n        }\n \n        public void actionPerformed(ActionEvent e) {\n            JTextField source = (JTextField)e.getSource();\n            shouldYieldFocus(source); //ignore return value\n            source.selectAll();\n        }\n    }\n \n    /**\n     * Create the GUI and show it.  For thread safety,\n     * this method should be invoked from the\n     * event-dispatching thread.\n     */\n    private static void createAndShowGUI() {\n        //Create and set up the window.\n        JFrame frame = new JFrame(&quot;InputVerificationDialogDemo&quot;);\n        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);\n        JComponent newContentPane = new InputVerificationDialogDemo();\n        newContentPane.setOpaque(true); //content panes must be opaque\n        frame.setContentPane(newContentPane);\n \n        //Display the window.\n        frame.pack();\n        frame.setVisible(true);\n    }\n \n    public static void main(String[] args) {\n    /* Use an appropriate Look and Feel */\n        try {\n            //UIManager.setLookAndFeel(&quot;com.sun.java.swing.plaf.windows.WindowsLookAndFeel&quot;);\n            //UIManager.setLookAndFeel(&quot;com.sun.java.swing.plaf.gtk.GTKLookAndFeel&quot;);\n            UIManager.setLookAndFeel(&quot;javax.swing.plaf.metal.MetalLookAndFeel&quot;);\n        } catch (UnsupportedLookAndFeelException ex) {\n            ex.printStackTrace();\n        } catch (IllegalAccessException ex) {\n            ex.printStackTrace();\n        } catch (InstantiationException ex) {\n            ex.printStackTrace();\n        } catch (ClassNotFoundException ex) {\n            ex.printStackTrace();\n        }\n        /* Turn off metal's use of bold fonts */\n        UIManager.put(&quot;swing.boldMetal&quot;, Boolean.FALSE);\n         \n        //Schedule a job for the event-dispatching thread:\n        //creating and showing this application's GUI.\n        javax.swing.SwingUtilities.invokeLater(new Runnable() {\n            public void run() {\n                createAndShowGUI();\n            }\n        });\n    }\n \n    //Compute the monthly payment based on the loan amount,\n    //APR, and length of loan.\n    double computePayment(double loanAmt, double rate, int numPeriods) {\n        double I, partial1, denominator, answer;\n \n        numPeriods *= 12;        //get number of months\n        if (rate &gt; 0.01) {  \n            I = rate / 100.0 / 12.0;         //get monthly rate from annual\n            partial1 = Math.pow((1 + I), (0.0 - numPeriods));\n            denominator = (1 - partial1) / I;\n        } else { //rate ~= 0\n            denominator = numPeriods;\n        }\n        answer = (-1 * loanAmt) / denominator;\n        return answer;\n    }\n \n    //Create and set up number formats. These objects also\n    //parse numbers input by user.\n    private void setUpFormats() {\n        moneyFormat = (NumberFormat)NumberFormat.getNumberInstance();\n \n        percentFormat = NumberFormat.getNumberInstance();\n        percentFormat.setMinimumFractionDigits(3);\n \n        decimalFormat = (DecimalFormat)NumberFormat.getNumberInstance();\n        decimalFormat.setParseIntegerOnly(true);\n \n        paymentFormat = (DecimalFormat)NumberFormat.getNumberInstance();\n        paymentFormat.setMaximumFractionDigits(2);\n        paymentFormat.setNegativePrefix(&quot;(&quot;);\n        paymentFormat.setNegativeSuffix(&quot;)&quot;);\n \n        integerFormat = NumberFormat.getIntegerInstance();\n    }\n}\n</code></pre>\n"
  }, {
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    "link" : "https://stackoverflow.com/questions/79838375/javafx-controls-module-cant-be-found-but-its-exists-in-the-right-location",
    "title" : "javafx.controls module can&#39;t be found but its exists in the right location",
    "body" : "<p>I using <strong>JDK 25</strong> and <strong>Apache Netbeans</strong> and <strong>Windows 11</strong>. My JavaFX SDK folder is in <code>C:\\</code> and I verified that it is indeed in the <em>lib</em> folder, but the compiler still says it can't find it. I'm pretty sure I initialized the correct VM options. Oh, and my <strong>build tool is Ant</strong>.</p>\n<p>VM Options:</p>\n<pre class=\"lang-none prettyprint-override\"><code>--module-path &quot;C:\\javafx-sdk-25.0.1\\lib&quot; --add-modules=javafx.controls,javafx.fxml\n</code></pre>\n<p>Erorr Message I keep getting:</p>\n<blockquote>\n<p>Error occurred during initialization of boot layer<br />\njava.lang.module.FindException: Module javafx.fxml not found</p>\n</blockquote>\n<p>Also can't find <code>javafx.controls</code></p>\n<p>Question: What am I possibly doing wrong and why can't the compiler find these two files?</p>\n<p>I read some stuff regarding dependencies causing this type of error. If that is the case can someone explain on how I would be able to configure these <em>dependencies</em> properly?</p>\n<p>Full Code (if it helps):</p>\n<pre class=\"lang-java prettyprint-override\"><code>/*\n * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license\n * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Main.java to edit this template\n */\npackage robot2;\n\n// Java FX library for playing mp3 audios\n\nimport com.phidget22.*;\nimport javafx.application.Application;\nimport javafx.scene.Scene;\n//import javafx.scene.control.Label;\nimport javafx.stage.Stage;\nimport javafx.scene.media.*;\nimport java.io.FileInputStream;\nimport static javafx.application.Application.launch;\n/**\n *\n * @author #\n */\npublic class Robot2 extends Application {\n    \n    private boolean alarmBlaring = false; // debounce boolean. prevents multiple JavaFX threads while one is already active\n    \n    /**\n     * @param args the command line arguments\n     */\n    @Override\n    public void start (Stage stage)\n    {\n        if (!alarmBlaring)\n        {\n            alarmBlaring = true;\n            System.out.println(&quot;Alarm playing!&quot;);\n            String fileDir = &quot;\\&quot;C:\\\\Users\\\\#\\\\Downloads\\\\alarm-clock-90867.mp3\\&quot;&quot;; // path to the mp3 audio file of the alarm\n            Media audioMedia = new Media(fileDir); // gets the file from the directory string\n            MediaPlayer alarm = new MediaPlayer(audioMedia); // declares the player of the mp3 file\n            alarm.setVolume(0.5);\n            alarm.setCycleCount(MediaPlayer.INDEFINITE); // loops the alarm audio indefinitely\n            try\n            {\n                alarm.play();\n                Thread.sleep(10000); // stop the alarm audio after 10 seconds\n                alarm.stop();\n                alarmBlaring = false;\n            }\n            catch (Exception e)\n            {\n                alarmBlaring = false;\n                System.out.println(&quot;error occured: &quot; + e); // print out error message\n            }\n        }\n    }\n    \n    public static void main(String[] args) throws Exception{\n        // TODO code application logic here\n        \n        // configs\n        float dbThreshold = 20f; // the max difference to trigger the output device (speaker/light)\n        \n        // inits\n        FileInputStream alarmDir = new FileInputStream(&quot;.mp3&quot;);\n        \n        SoundSensor dbChecker = new SoundSensor();\n        double prevDb = 0;\n        \n        dbChecker.setHubPort(4);\n        //dbChecker.setIsHubPortDevice(true);\n        \n        //greenLED.open(1000);\n        dbChecker.open(5000);\n        \n        while (true)\n        {\n            try\n            {\n                double db = dbChecker.getdB();\n                if (prevDb == 0)\n                {\n                    prevDb = db;\n                } else\n                {\n                    System.out.println(&quot;db: &quot; + db + &quot; | &quot; + &quot;prev: &quot; + prevDb);\n                    double dbDiff = db - prevDb;\n                    if (dbDiff &gt; dbThreshold)\n                    {\n                        launch(args);\n                    } \n                }\n                prevDb = db;\n                \n                //System.out.println(&quot;Recorded Decibles: &quot; + db);\n                // db spike logic\n            }\n            catch (PhidgetException err)\n            {\n                System.out.println(&quot;Decibles exceed sensor capability&quot;);\n            }\n            Thread.sleep(250);\n        }\n    }\n}\n</code></pre>\n"
  }, {
    "tags" : [ "java", "string", "http", "http-headers", "text-parsing" ],
    "owner" : {
      "account_id" : 22114836,
      "reputation" : 1,
      "user_id" : 16369121,
      "user_type" : "registered",
      "profile_image" : "https://www.gravatar.com/avatar/f3809bc9ffd8edb176ab83509e08e0c2?s=256&d=identicon&r=PG&f=y&so-version=2",
      "display_name" : "Abdelouahab ",
      "link" : "https://stackoverflow.com/users/16369121/abdelouahab"
    },
    "is_answered" : true,
    "view_count" : 49,
    "answer_count" : 2,
    "score" : 0,
    "last_activity_date" : 1764885099,
    "creation_date" : 1764878538,
    "last_edit_date" : 1764879847,
    "question_id" : 79838312,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79838312/how-to-handle-variable-length-header-values-when-parsing-http-requests-in-java",
    "title" : "How to handle variable-length header values when parsing HTTP requests in Java?",
    "body" : "<p>I'm building an HTTP server and parsing request headers. My current code fails when the <code>Host</code> header includes a port number because I'm splitting on <code>:</code>.</p>\n<p><strong>Current Code:</strong></p>\n<pre class=\"lang-java prettyprint-override\"><code>String[] header = line.split(&quot;:&quot;);\nString key = header[0].trim();\nString value = header[1].trim();\nif (key.equals(&quot;Host&quot;)) {\n    value = value + &quot;:&quot; + header[2]; // ArrayIndexOutOfBoundsException!\n}\n</code></pre>\n<p><strong>Problem:</strong></p>\n<ul>\n<li><p>Works for <code>Host: example.com:8080</code></p>\n</li>\n<li><p>Fails for <code>Host: example.com</code> (no port)</p>\n</li>\n</ul>\n<p><strong>Question:</strong></p>\n<p>What's the best way to rejoin header values that may contain colons?</p>\n<p><strong>What I've tried:</strong></p>\n<ul>\n<li><p>Checking <code>header.length</code> but feels clunky</p>\n</li>\n<li><p>Using <code>indexOf(':')</code> instead of <code>split()</code></p>\n</li>\n</ul>\n<p>Which approach is more robust for HTTP header parsing?</p>\n"
  }, {
    "tags" : [ "java", "shader", "processing", "fragment-shader" ],
    "owner" : {
      "account_id" : 23865169,
      "reputation" : 3,
      "user_id" : 17867596,
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      "display_name" : "helpthisnoob",
      "link" : "https://stackoverflow.com/users/17867596/helpthisnoob"
    },
    "is_answered" : false,
    "view_count" : 50,
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    "score" : 0,
    "last_activity_date" : 1764868688,
    "creation_date" : 1764868688,
    "question_id" : 79838187,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79838187/how-to-prevent-pixels-from-overwriting-each-other-in-processing",
    "title" : "How to prevent pixels from overwriting each other in processing?",
    "body" : "<p>I am learning dithering, and the best way for me to do this is to play around in processing. My end goal is to create something that mimics the aesthetic of <em>The Return of Obra Dinn.</em></p>\n<p>My code so far does 2 things:</p>\n<ol>\n<li>detect edges and change the color of edge pixels to white</li>\n<li>complete bayer dithering (though i think I may have done it a little differently than true bayer dithering. but this is not my issue, i'm fine the way it is and learning this on my own).</li>\n</ol>\n<p>The issue I am having is that the white edge pixels are not rendering. If I remove all the bayer dithering pieces in the draw function, it does draw correctly. However, with the bayer dithering it disappears. I sense it has to do with the order of how I'm rendering this, but I can't seem to figure out what I should change.</p>\n<p>So far, I have tried moving things around in the draw function so that the whole chunk of changing edges happens at the end of the draw function rather than the start. I've also tried adding an if statement so that any white pixels on img are skipped when going through the loops of dithering. Maybe I'm loading and updating pixels incorrectly?</p>\n<pre><code>PImage img;\ncolor white= color(255);\ncolor black=color(0);\nIntList seed;\nint starter=0;\nint z=0;\nint v= 0;\nint gCols=0;\nint gRows=0;\nint [][]gMatrix;\ncolor light= #e5ffff;\ncolor dark= #333319;\nfloat pRound= 0;\nfloat gRound=0;\n\nvoid setup (){\n  size (800,500);\n  img= loadImage(&quot;nosferatu.jpg&quot;);\n  noLoop();\n  img.loadPixels();\n  seed= new IntList(0,32,8,40,2,34,10,42,48,16,56,24,50,18,58,26,12,44,4,36,14,46,6,38,60,28,52,20,62,30,54,22,3,35,11,43,1,33,9,41,51,19,59,27,49,17,57,25,15,47,7,39,13,45,5,37,63,31,55,23,61,29,53,21);\n  for (int k=0; k&lt;seed.size();k++){\n    int newK= seed.get(k);\n    int newS= (newK/63)*255;\n    seed.set(k,newS);\n  }\n  int cols= 8;\n  int rows= 8;\n  int [][]matrix= new int [cols][rows];\n  for (int i = 0; i &lt;rows; i++){\n    for (int j = 0; j&lt;cols; j++){\n      matrix[j][i]= seed.get(starter);\n      starter=starter+1;\n    }\n  }\n  int fCols= img.width;\n  int fRows= img.height;\n  int [][]fMatrix = new int [fCols][fRows];\n  for (int t=0; t&lt;fRows; t++){\n    if (v&gt;7){\n      v=0;\n    }\n    for (int s=0; s&lt;fCols; s++){\n      if (z&gt;7){\n        z=0;\n      }\n      fMatrix[s][t]= matrix[z][v];\n      z=z+1;\n    }\n    v=v+1;\n  \n}\n  gCols= img.width;\n  gRows= img.height;\n  gMatrix= new int [gCols][gRows];\n  for (int q=0; q&lt;gRows; q++){\n    for (int p=0; p&lt;gCols; p++){\n      gMatrix[p][q]= fMatrix[p][q];\n    }\n    \n}\n}\n\nvoid draw () {\n  image(img,0,0);\n  img.filter(GRAY);\n  img.loadPixels();\n  PImage grayImg = img.copy();\n  grayImg.filter (BLUR,13);\n  grayImg.loadPixels();\n  for (int y=1; y&lt;grayImg.height-1; y++) {\n    for (int x=1; x&lt;grayImg.width-1; x++){\n      color gValue= grayImg.get (x,y);\n      float g2Value= red(gValue);\n      color lValue= grayImg.get(x-1,y);\n      float l2Value= red(lValue);\n      color rValue= grayImg.get(x+1,y);\n      float r2Value= red(rValue);\n      color bValue= grayImg.get(x, y+1);\n      float b2Value= red(bValue);\n      float rSub= abs(g2Value-r2Value);\n      float lSub=abs(g2Value-l2Value);\n      float bSub= abs(g2Value-b2Value);\n      if ((rSub&gt;5) || (lSub&gt;5) || (bSub&gt;5)){\n        img.set(x,y,white);\n      } \n      \n  }\n  }\n  for (int yy =0; yy&lt;img.height; yy++){\n    for (int xx=0; xx&lt;img.width;xx++){\n      color iValue= img.get(xx,yy);\n      float pValue= red(iValue);\n      if (pValue != white){\n        if (pValue&gt;255/2){\n          pRound = 255;\n        } else {\n          pRound=0;\n        }   \n         if (gMatrix[xx][yy]&gt;255/2){\n          gRound = 255;\n        } else {\n          gRound=0;\n        }     \n        if (pValue&gt;gMatrix[xx][yy]){\n          if (pRound==255){\n          img.set(xx,yy,light);\n          } else {\n            img.set(xx,yy,dark);\n        }} else if (pValue &lt; gMatrix[xx][yy]) {\n            if (gRound == 255){\n            img.set(xx,yy,light);\n            } else {\n              img.set(xx,yy,dark);\n        }\n        } else{\n          img.set(xx,yy,gMatrix[xx][yy]);\n      }\n      }\n    }\n    }\n  img.updatePixels();\n  image(img,0,0);\n  \n  \n}\n</code></pre>\n<p>I know my code is not written efficiently. Again, I'm learning dithering so it's easier for me to first start by breaking up my challenge before optimizing.</p>\n<p>Looking for some help to figure out what I am doing wrong. Can you point me in the right direction at least?</p>\n"
  }, {
    "tags" : [ "java", "android", "android-studio", "smali" ],
    "owner" : {
      "account_id" : 34761195,
      "reputation" : 1,
      "user_id" : 26826325,
      "user_type" : "registered",
      "profile_image" : "https://www.gravatar.com/avatar/2227e0c9079e7a0a0fd6eef1846cba80?s=256&d=identicon&r=PG&f=y&so-version=2",
      "display_name" : "Ahn",
      "link" : "https://stackoverflow.com/users/26826325/ahn"
    },
    "is_answered" : false,
    "view_count" : 20,
    "answer_count" : 0,
    "score" : -1,
    "last_activity_date" : 1764865400,
    "creation_date" : 1764864641,
    "last_edit_date" : 1764865400,
    "question_id" : 79838128,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79838128/android-studio-fail-to-load-plugin-descriptor-from-file-smalidea-zip",
    "title" : "Android Studio - Fail to load plugin descriptor from file smalidea.zip",
    "body" : "<p>I want to use smalidea plugin in Android Studio (version 4.1.1) from this github <a href=\"https://github.com/JesusFreke/smalidea\" rel=\"nofollow noreferrer\">repo</a> but after downloading many version of smalidea (.zip file) using their <a href=\"https://bitbucket.org/JesusFreke/smalidea/downloads\" rel=\"nofollow noreferrer\">DOWNLOAD LINK</a> and installed plugin from disk in Android Studio. AS returned the same error: &quot;Fail to load plugin descriptor from file JesusFreke-smalidea-xxx.zip&quot;.</p>\n<p>I tried to use the some solution like changing version of Android Studio (3.5.1, 3.6.3) but it's not working.\nI also tried to</p>\n<ol>\n<li>Download smalidea-0.05.zip from bitbucket</li>\n<li>Extract the plugin.xml in smalidea/META-INF/ somewhere you can edit</li>\n<li>Add the following tag under the  tag:\n&lt; depends&gt;com.intellij.modules.androidstudio&lt;/ depends&gt;</li>\n</ol>\n<p>Please help me to fix this, I appreciate any answer. <a href=\"https://i.sstatic.net/LKrTjZdr.png\" rel=\"nofollow noreferrer\">error in android studio</a></p>\n"
  }, {
    "tags" : [ "java", "regex", "unit-testing" ],
    "owner" : {
      "account_id" : 27523081,
      "reputation" : 37,
      "user_id" : 31391455,
      "user_type" : "registered",
      "profile_image" : "https://i.sstatic.net/JfGXLng2.jpg?s=256",
      "display_name" : "holysh",
      "link" : "https://stackoverflow.com/users/31391455/holysh"
    },
    "is_answered" : true,
    "view_count" : 72,
    "answer_count" : 1,
    "score" : -1,
    "last_activity_date" : 1764952960,
    "creation_date" : 1764863480,
    "last_edit_date" : 1764952960,
    "question_id" : 79838110,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79838110/how-can-i-solve-this-problem-of-test-difference",
    "title" : "How can I solve this problem of test difference?",
    "body" : "<p>As far as I understand, the difference between expected and actual one is <strong>NBSP</strong> (<a href=\"https://en.wikipedia.org/wiki/Non-breaking_space\" rel=\"nofollow noreferrer\">Non‐Breaking Space</a>).</p>\n<p>I don’t know how to remove this. It doesn’t get highlighted and cannot be found using CTRL+H (looking for \\u00A0).</p>\n<p><em>I've already tried:</em></p>\n<ul>\n<li>searching via CTRL+H to remove or replace it</li>\n<li>deleting the entire line and rewriting it manually.</li>\n</ul>\n<p><strong>here is the code of my test:</strong></p>\n<pre><code>void shouldReturnFullReport_whenGivenSeveralDrivers() {\n\n    Map&lt;String, RacerInfo&gt; racers = new LinkedHashMap&lt;&gt;();\n    racers.put(&quot;SVF&quot;, new RacerInfo(&quot;Sebastian Vettel&quot;, &quot;FERRARI&quot;));\n    racers.put(&quot;DRR&quot;, new RacerInfo(&quot;Daniel Ricciardo&quot;, &quot;RED BULL RACING TAG HEUER&quot;));\n    racers.put(&quot;VBM&quot;, new RacerInfo(&quot;Valtteri Bottas&quot;, &quot;MERCEDES&quot;));\n    racers.put(&quot;LHM&quot;, new RacerInfo(&quot;Lewis Hamilton&quot;, &quot;MERCEDES&quot;));\n\n    Map&lt;String, Duration&gt; lapTimes = new LinkedHashMap&lt;&gt;();\n    lapTimes.put(&quot;SVF&quot;, Duration.ofMinutes(1).plusSeconds(4).plusMillis(415));\n    lapTimes.put(&quot;DRR&quot;, Duration.ofMinutes(1).plusSeconds(12).plusMillis(13));\n    lapTimes.put(&quot;VBM&quot;, Duration.ofMinutes(1).plusSeconds(12).plusMillis(434));\n    lapTimes.put(&quot;LHM&quot;, Duration.ofMinutes(1).plusSeconds(12).plusMillis(460));\n\n    String expected = &quot;&quot;&quot;\n         1. Sebastian Vettel       | FERRARI                        | 1:04.415\n         2. Daniel Ricciardo       | RED BULL RACING TAG HEUER      | 1:12.013\n         3. Valtteri Bottas        | MERCEDES                       | 1:12.434\n         4. Lewis Hamilton         | MERCEDES                       | 1:12.460\n        &quot;&quot;&quot;;\n\n    assertEquals(expected, ResultFormatter.format(lapTimes, racers));\n}\n</code></pre>\n<p><a href=\"https://i.sstatic.net/Tg95nmJj.png\" rel=\"nofollow noreferrer\"><img src=\"https://i.sstatic.net/Tg95nmJj.png\" alt=\"here is the difference between expected and actual one\" /></a></p>\n"
  }, {
    "tags" : [ "java", "spring", "spring-boot", "mcp-server" ],
    "owner" : {
      "account_id" : 44524247,
      "reputation" : 11,
      "user_id" : 31797545,
      "user_type" : "registered",
      "profile_image" : "https://www.gravatar.com/avatar/ebc59fb36d33cafa2920c72faa04e6fe?s=256&d=identicon&r=PG&f=y&so-version=2",
      "display_name" : "user31797545",
      "link" : "https://stackoverflow.com/users/31797545/user31797545"
    },
    "is_answered" : false,
    "view_count" : 36,
    "answer_count" : 0,
    "score" : 1,
    "last_activity_date" : 1764856907,
    "creation_date" : 1764856279,
    "last_edit_date" : 1764856907,
    "question_id" : 79837982,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79837982/how-to-connect-to-mcp-server-transport-type-streamable-http-in-mcp-inspector",
    "title" : "How to connect to MCP server (Transport type: Streamable HTTP) in MCP Inspector (v0.17.2)",
    "body" : "<p>I have this local MCP-server and I want to test with this <a href=\"https://modelcontextprotocol.io/docs/tools/inspector\" rel=\"nofollow noreferrer\">MCP Inspector</a>, I followed this <a href=\"https://medium.com/@laurentkubaski/how-to-use-mcp-inspector-2748cd33faeb\" rel=\"nofollow noreferrer\">tutorial</a> but it does not work.</p>\n<p><a href=\"https://i.sstatic.net/6HNuvMwB.png\" rel=\"nofollow noreferrer\">Got this following error.</a></p>\n<p>My MCP-server written in java (Spring boot) using:</p>\n<pre><code>&lt;dependency&gt; \n    &lt;groupId&gt;org.springframework.ai&lt;/groupId&gt; \n    &lt;artifactId&gt;spring-ai-starter-mcp-server-webflux&lt;/artifactId&gt; \n&lt;/dependency&gt;\n</code></pre>\n<p>McpApplication.java</p>\n<pre><code>@SpringBootApplication  \npublic class McpApplication {  \n  \n    public static void main(String args) {  \n        SpringApplication.run(McpApplication.class, args);  \n    }  \n  \n    @Bean  \n    public ToolCallbackProvider employeeTools(EmployeeService employeeService) {  \n        return MethodToolCallbackProvider.builder().toolObjects(employeeService).build();  \n    }  \n}  \n</code></pre>\n<p>ToolService.java</p>\n<pre><code>@Service  \n@RequiredArgsConstructor  \n@Slf4j  \npublic class EmployeeService {  \n  \nprivate final SomeRepository someRepository;  \n  \n@Tool(description =&quot;Tool Description&quot;)  \npublic Flux&lt;ResponseChunk&gt; toolMethod( Param param) {       \n     // Tool implementation here.  \n}  \n}  \n</code></pre>\n<p>And these are config option.</p>\n<pre><code>\nspring.ai.mcp.server.enabled=true spring.ai.mcp.server.name=filter-mcp-server spring.ai.mcp.server.version=0.0.1 spring.ai.mcp.server.protocol=STREAMABLE spring.ai.mcp.server.type=ASYNC spring.ai.mcp.server.endpoint=/mcp spring.ai.mcp.server.stdio=false\n</code></pre>\n<p>Need some help!</p>\n"
  }, {
    "tags" : [ "java", "javafx" ],
    "owner" : {
      "account_id" : 10187542,
      "reputation" : 2677,
      "user_id" : 20692967,
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      "profile_image" : "https://i.sstatic.net/NZSXm.jpg?s=256",
      "display_name" : "Sergey Zolotarev",
      "link" : "https://stackoverflow.com/users/20692967/sergey-zolotarev"
    },
    "is_answered" : true,
    "view_count" : 94,
    "answer_count" : 7,
    "score" : 1,
    "last_activity_date" : 1764859131,
    "creation_date" : 1764842953,
    "question_id" : 79837783,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79837783/disable-button-as-click-is-still-processed",
    "title" : "Disable Button as click is still processed",
    "body" : "<p>Suppose a click on a JavaFX button is processed for some period of time (e.g. it performs some IO). How do you block interaction with that button while a click is still being processed? Say, it is processed for one second, and during that second no clicks made by the user should be processed.</p>\n<p>I feel there's a better way than to manually manipulate the <code>disable</code> property.</p>\n<p>Java 8, JavaFX 8.</p>\n<pre class=\"lang-java prettyprint-override\"><code>    private Button createOkButton() {\n        Button ok = new Button(&quot;OK&quot;);\n        ok.setOnAction(e -&gt; onOk());\n    }\n\n    private void onOk() {\n        ok.setDisable(true);\n        doSomething();\n        ok.setDisable(false);\n    }\n</code></pre>\n"
  }, {
    "tags" : [ "java" ],
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      "display_name" : "ablyworks",
      "link" : "https://stackoverflow.com/users/23543144/ablyworks"
    },
    "is_answered" : false,
    "view_count" : 46,
    "closed_date" : 1764842878,
    "answer_count" : 0,
    "score" : -5,
    "last_activity_date" : 1764839064,
    "creation_date" : 1764838065,
    "last_edit_date" : 1764839064,
    "question_id" : 79837707,
    "link" : "https://stackoverflow.com/questions/79837707/issue-integrating-aeps-api-with-java-backend",
    "closed_reason" : "Not suitable for this site",
    "title" : "Issue Integrating AEPS API With Java Backend",
    "body" : "<p>I am building an AEPS service panel in <strong>Java + React</strong>.<br />\nWhile integrating an AEPS API, I am facing an issue where the request takes too long and returns a timeout.</p>\n<h3><strong>My backend setup:</strong></h3>\n<ul>\n<li><p>Java (Spring Boot)</p>\n</li>\n<li><p>React frontend</p>\n</li>\n<li><p>Using external AEPS API for cash withdrawal &amp; balance check</p>\n</li>\n<li><p>Server deployed on a VPS</p>\n</li>\n</ul>\n<h3><strong>My Problem:</strong></h3>\n<p>Whenever I send a request to the AEPS API endpoint, I get:</p>\n<h3><strong>Code Snippet:</strong></h3>\n<h3><strong>What I Have Tried:</strong></h3>\n<ul>\n<li><p>Increasing timeout</p>\n</li>\n<li><p>Changing internet network</p>\n</li>\n<li><p>Testing API via Postman (works fine)</p>\n</li>\n<li><p>Tried adding connection timeout:</p>\n</li>\n</ul>\n<p>Still getting timeout only from Java backend, not Postman.</p>\n<h3><strong>Expected Output:</strong></h3>\n<p>API response (JSON) with transaction status.</p>\n<h3><strong>Actual Output:</strong></h3>\n<p>Timeout exception only from Java code.</p>\n"
  }, {
    "tags" : [ "java", "swing", "jcombobox" ],
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      "display_name" : "Sam Shipley",
      "link" : "https://stackoverflow.com/users/30771329/sam-shipley"
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    "last_activity_date" : 1764856813,
    "creation_date" : 1764827083,
    "question_id" : 79837547,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79837547/java-swing-jcombobox-getselecteditem-not-finding-the-object-cannot-be-resol",
    "title" : "Java Swing - JComboBox getSelectedItem() not finding the object (cannot be resolved)",
    "body" : "<p>I'm making a simple budget calculator tool, where I have a couple input boxes, and a <code>JComboBox</code> to select /week, /month, or /year</p>\n<p>I assumed I could just call <code>getSelectedItem()</code> on <em>foodRateBox</em> to get the selected item like I can with getting the text from a field such as <em>foodField</em> using <code>getText()</code>, but when I try it, I get:</p>\n<blockquote>\n<p>&quot;foodRateBox cannot be resolved <em>Java(570425394)</em>&quot;</p>\n</blockquote>\n<p>What am I missing?</p>\n<p>Basic stuff:</p>\n<pre class=\"lang-java prettyprint-override\"><code>public class BudgetBase extends JPanel {    // based on Swing JPanel\n\n    JFrame topLevelFrame;  // top-level JFrame\n    GridBagConstraints layoutConstraints = new GridBagConstraints(); // layout\n\n    private JButton calculateButton;   // Calculate button\n    private JButton exitButton;        // Exit button\n\n    private JTextField wagesField;     // Wages text field\n    private JTextField loansField;     // Loans text field\n    private JTextField otherIncomeField;     // text field for anyhting else\n    private JTextField totalIncomeField; // Total Income field\n\n    private JTextField foodField;   // food text field\n    private JTextField rentField;   // rent text field\n    private JTextField otherSpendingField;  // text field for anyhting else\n    private JTextField totalSpendingField;  // Total Spending field\n\n    private JTextField deficitField; // difference between spending and income\n    String[] rate = {&quot;/week&quot;, &quot;/month&quot;, &quot;/year&quot;};   // selection for the JComboBoxes\n...\n</code></pre>\n<p>Then I have a function for the components and adding them to the gridbag</p>\n<pre class=\"lang-java prettyprint-override\"><code>private void initComponents() { \n\n    ...\n\n// Row 1 - Wages label, box, and text field\n    JLabel wagesLabel = new JLabel(&quot;Wages&quot;);\n    addComponent(wagesLabel, 1, 0);\n\n    final JComboBox&lt;String&gt; wagesRateBox = new JComboBox&lt;String&gt;(rate);\n    addComponent(wagesRateBox, 1, 1);\n\n    wagesField = new JTextField(&quot;&quot;, 10);   // blank initially, with 10 columns\n    wagesField.setHorizontalAlignment(JTextField.RIGHT) ;  \n    addComponent(wagesField, 1, 2); \n\n    ...\n</code></pre>\n<p>When the <em>calculate</em> button is pressed, it calls a function to do some calculations and this is where I want to get the item in the <code>JComboBox</code>.</p>\n<pre class=\"lang-java prettyprint-override\"><code>public double calculateTotalSpending() {\n\n    // get values from spendng text fields.  valie is NaN if an error occurs\n    String spendingError = &quot;&quot;;    // track errors to output as one message\n    double food = getTextFieldValue(foodField);\n    double rent = getTextFieldValue(rentField);\n    double otherS = getTextFieldValue(otherSpendingField);    //otherS for 'Other Spending'\n\n    String foodRate = foodRateBox.getSelectedItem();\n\n    ...\n</code></pre>\n<p><code>getTextFieldValue</code> is just this:</p>\n<pre class=\"lang-java prettyprint-override\"><code>private double getTextFieldValue(JTextField field) {\n\n    // get value as String from field\n    String fieldString = field.getText();  // get text from text field\n\n    if ((fieldString.trim()).equals(&quot;&quot;)) {   // if text field is blank, return 0\n        return 0.0;\n    } \n\n    else {  // if text field is not blank, parse it into a double\n        try {\n            return Double.parseDouble(fieldString);  // parse field number into a double\n         } catch (java.lang.NumberFormatException ex) {  // catch invalid number exception\n            return Double.NaN;  // return NaN to show that field is not a number\n        }\n    }\n}\n</code></pre>\n"
  }, {
    "tags" : [ "java", "solr", "ddf" ],
    "owner" : {
      "account_id" : 965027,
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    "question_id" : 79837459,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79837459/unable-to-ingest-geojson-into-ddf-2-26-45-solr-error-ingest-fails-with-no-det",
    "title" : "Unable to ingest GeoJSON into DDF 2.26.45 (Solr error + ingest fails with no detailed message)",
    "body" : "<p>I'm running DDF 2.26.45 on macOS and configured it to use an external Solr 8.6.1 running locally at:</p>\n<pre><code>http://localhost:8983/solr\n</code></pre>\n<p>DDF detects Solr correctly:</p>\n<pre><code>solr.client = HttpSolrClient\nsolr.http.url = http://localhost:8983/solr\n</code></pre>\n<p>I created a Solr core:</p>\n<pre><code>./solr create -c alerts -s 1 -rf 1\n</code></pre>\n<p>Solr starts correctly.</p>\n<hr />\n<h2>Goal</h2>\n<p>I want to ingest a simple GeoJSON file into the DDF catalog.</p>\n<p>File: /tmp/test-location.geojson</p>\n<pre><code>{\n  &quot;type&quot;: &quot;FeatureCollection&quot;,\n  &quot;features&quot;: [\n    {\n      &quot;type&quot;: &quot;Feature&quot;,\n      &quot;geometry&quot;: {\n        &quot;type&quot;: &quot;Point&quot;,\n        &quot;coordinates&quot;: [-77.0369, 38.9072]\n      },\n      &quot;properties&quot;: {\n        &quot;name&quot;: &quot;Test Location&quot;\n      }\n    }\n  ]\n}\n</code></pre>\n<hr />\n<h2>Command used inside DDF Karaf</h2>\n<pre><code>catalog:ingest -t geojson /tmp/test-location.geojson\n</code></pre>\n<p>Also tried:</p>\n<pre><code>catalog:ingest -t geojson -s catalog /tmp/test-location.geojson\n</code></pre>\n<hr />\n<h2>Result</h2>\n<pre><code>0 file(s) ingested in 0 seconds\n1 file(s) failed to be ingested. See the ingest log for more details.\n</code></pre>\n<p>Enabled debug logging:</p>\n<pre><code>log:set DEBUG org.codice.ddf.commands.catalog.IngestCommand\n</code></pre>\n<hr />\n<h2>ingest_error.log excerpts</h2>\n<pre><code>2025-12-03T13:28:26,449 | INFO  | location.geojson | ingestLogger | f.commands.catalog.IngestCommand 338 | 455 - catalog-core-commands - 2.26.45 | 0 file(s) ingested in 0 seconds [0 records/sec]\n2025-12-03T13:28:26,449 | WARN  | location.geojson | ingestLogger | f.commands.catalog.IngestCommand 351 | 455 - catalog-core-commands - 2.26.45 | 1 file(s) failed to be ingested.\n(repeats every attempt)\n</code></pre>\n<hr />\n<h2>ddf.log Solr error spam</h2>\n<pre><code>Error retrieving system alert.\norg.codice.ddf.persistence.PersistenceException\n\nCaused by: org.apache.solr.client.solrj.impl.HttpSolrClient$RemoteSolrException:\nError from server at http://localhost:8983/solr/alerts:\ncan not sort on multivalued field: id_txt of type: text_general\n</code></pre>\n<hr />\n<h2>Additional details</h2>\n<p>GeoJSON transformers appear in service:list:</p>\n<pre><code>id = catalog.data.metacard.geojson\nid = geojson\ndisplayName = GeoJSON\nshortname = geojson\n</code></pre>\n<p>The ingest command always returns:</p>\n<pre><code>0 ingested, 1 failed\n</code></pre>\n<p>The DDF admin UI shows:</p>\n<pre><code>&quot;Persistent Storage Not Responding. Could Not Retrieve Alerts.&quot;\n</code></pre>\n<p>I only created a single Solr core named &quot;alerts&quot;.\nI'm not sure what cores or configsets DDF requires when using external Solr.</p>\n<hr />\n<h2>Question</h2>\n<p>Exactly what Solr cores and configsets does DDF 2.26.45 require when using external Solr, and how do I configure them so that:</p>\n<ol>\n<li>GeoJSON ingestion works</li>\n<li>The Solr error &quot;cannot sort on multivalued field: id_txt&quot; stops</li>\n<li>The internal alerts/persistence store initializes properly</li>\n</ol>\n<p>If anyone has a working external-Solr setup for DDF 2.26.x, please share the required cores, configsets, and schema.xml examples.</p>\n"
  }, {
    "tags" : [ "java", "mysql", "jdbc" ],
    "owner" : {
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      "display_name" : "PEREZ MONSIVAIS JOSE DE JESUS ",
      "link" : "https://stackoverflow.com/users/26564077/perez-monsivais-jose-de-jesus"
    },
    "is_answered" : false,
    "view_count" : 65,
    "closed_date" : 1764809796,
    "answer_count" : 0,
    "score" : 3,
    "last_activity_date" : 1764809746,
    "creation_date" : 1764806995,
    "last_edit_date" : 1764808173,
    "question_id" : 79837422,
    "link" : "https://stackoverflow.com/questions/79837422/why-dont-my-mysql-usernames-match-when-i-use-them-in-jdbc",
    "closed_reason" : "Duplicate",
    "title" : "Why don&#39;t my MySQL usernames match when I use them in JDBC?",
    "body" : "<p>I’m having trouble understanding how MySQL users actually work.<br />\nWhen I run:</p>\n<p><code>SELECT USER();</code> MySql shows: <code>root@localhost</code> .<br />\nBut my username when i log in is <em><strong>ade</strong></em>. so when I to set a connection using <code>DriverManager. getConnnection()</code>, I try both usernames but it gives me:</p>\n<pre><code>Exception in thread &quot;main&quot; java.lang.RuntimeException: java.sql.SQLException: Access denied for user 'ade'@'localhost' (using password: YES)\n    at jdbcpractices.Test.main(Test.java:18)\n</code></pre>\n<p>or</p>\n<pre><code>Exception in thread &quot;main&quot; java.lang.RuntimeException: java.sql.SQLException: Access denied for user 'root@localhost'@'localhost' (using password: YES)\n    at jdbcpractices.Test.main(Test.java:18)\n</code></pre>\n<p>It only works when using the user <code>&quot;root&quot;</code>. (my implementation below.)</p>\n<pre><code>public class Test {\n    public static void main(String[] args) {\n        String user = &quot;root&quot;; //ade\n        String password = &quot;quesadilla&quot;;\n        String URL = &quot;jdbc:mysql://localhost:3306/ademysql&quot;;\n\n        try {\n            Connection conn = DriverManager.getConnection(URL, user, password);\n            System.out.println(&quot;Connected to database&quot;);\n        } catch (SQLException e) {\n            throw new RuntimeException(e);\n        }\n\n    }\n}\n</code></pre>\n<p>So what’s the difference between them? Isn’t it supposed to work with <code>ade</code> or <code>root@localhost</code> as well? I’m confused about how this works underneath. Please give me some guidelines or help me understand this confusion. Thanks in advance!!</p>\n"
  }, {
    "tags" : [ "java", "spring", "hibernate" ],
    "owner" : {
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    "last_activity_date" : 1764792298,
    "creation_date" : 1764790978,
    "last_edit_date" : 1764792298,
    "question_id" : 79837267,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79837267/hibernate-lazyinitializationexception-cannot-evaluate-tostring",
    "title" : "Hibernate LazyInitializationException - Cannot evaluate .toString()",
    "body" : "<p>I'm migrating from Spring Boot 2.7 to Spring Boot 3 and this means i'm migrating from Hibernate 5 to Hibernate 6.</p>\n<p>I'm meeting some LazyInitializationException .</p>\n<p>This is part of a entity of mine:</p>\n<pre class=\"lang-java prettyprint-override\"><code>@Data\n@AllArgsConstructor\n@NoArgsConstructor\n@Entity\n@Table(name = &quot;base_doc_class&quot;, schema = &quot;anag&quot;)\n@EqualsAndHashCode(callSuper = true)\n@ToString(callSuper = true)\npublic class BaseDocClass extends AuditTrailEntity implements Serializable {\n\n\n\n    @EqualsAndHashCode.Exclude\n    @ToString.Exclude\n    @OneToMany(fetch = FetchType.LAZY, mappedBy = &quot;baseDocClass&quot;)\n    private Set&lt;UserDocClass&gt; userDocClass;\n\n    @ManyToOne\n    @JoinColumn(name = &quot;parent_id&quot;)\n    private BaseDocClass parentClass;\n\n\n}\n</code></pre>\n<p>And this is my other entity:</p>\n<pre class=\"lang-java prettyprint-override\"><code>@Data\n@AllArgsConstructor\n@NoArgsConstructor\n@Entity\n@Table(name = &quot;user_doc_class&quot;, schema = &quot;anag&quot;)\n@EqualsAndHashCode(callSuper = true)\n@ToString(callSuper = true)\npublic class UserDocClass extends AuditTrailEntity implements Serializable {\n\n\n\n    @ManyToOne\n    @JsonIgnore\n    @JoinColumn(name = &quot;base_doc_class_id&quot;)\n    private BaseDocClass baseDocClass;\n\n    @EqualsAndHashCode.Exclude\n    @ToString.Exclude\n    @JsonIgnore\n    @OneToMany(fetch = FetchType.LAZY, mappedBy = &quot;userDocClass&quot;)\n    private Set&lt;ArchiveDocclassMimetype&gt; archiveDocclassMimetype;\n\n\n}\n</code></pre>\n<p>Since I passed to Hibernate 6 I'm meeting Hibernate Lazy Exception each time I make a get of an entity from another entity, this is a simple code sample:</p>\n<pre class=\"lang-java prettyprint-override\"><code>pdv.setParentdocclassname(syncPdvBucketHolder.getUserDocClass().getBaseDocClass().getName());\n</code></pre>\n<p>The BaseDocClass contained by the UserDocClass has only the id, the other attributes are empty and when I try to run that code I'm meeting this exception (package name censored):</p>\n<pre class=\"lang-none prettyprint-override\"><code>could not initialize proxy [****.entity.anag.BaseDocClass#22897e28-c859-401a-a19e-82216f64a891] - no Session\n</code></pre>\n<p>I tried most solutions I read online to solve this. I tried adding <code>@ManyToOne(fetch = fetchtype.eager)</code> annotation on attibute columns but it didn't work. I tried even using things like the Spring properties:</p>\n<pre class=\"lang-yaml prettyprint-override\"><code>spring:\n  jpa:\n    open-in-view: true\n    properties:\n      hibernate:\n        enable_lazy_load_no_trans: true\n</code></pre>\n<p>But it still doesn't work.\nI tried using <code>@Transactional</code> annotation on method and it didn't work.</p>\n<p>Do you have any other ideas?</p>\n<p>Here's the complete stacktrace:</p>\n<pre><code>org.hibernate.LazyInitializationException: could not initialize proxy [****.entity.anag.BaseDocClass#22897e28-c859-401a-a19e-82216f64a891] - no Session\n    at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:164)\n    at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:309)\n    at org.hibernate.proxy.pojo.bytebuddy.ByteBuddyInterceptor.intercept(ByteBuddyInterceptor.java:44)\n    at org.hibernate.proxy.ProxyConfiguration$InterceptorDispatcher.intercept(ProxyConfiguration.java:95)\n    at ****.entity.anag.BaseDocClass$HibernateProxy$uYsjXwmW.getName(Unknown Source)\n    at ****.service.generic.GenericPdvService.createPdv(GenericPdvService.java:652)\n    at ****.pdvupload.service.PdvDepositService.savePdv(PdvDepositService.java:126)\n    at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:132)\n    at reactor.core.publisher.MonoFlatMap$FlatMapMain.secondComplete(MonoFlatMap.java:245)\n    at reactor.core.publisher.MonoFlatMap$FlatMapInner.onNext(MonoFlatMap.java:305)\n    at reactor.core.publisher.FluxOnErrorResume$ResumeSubscriber.onNext(FluxOnErrorResume.java:79)\n    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onNext(FluxMapFuseable.java:129)\n    at reactor.core.publisher.Operators$ScalarSubscription.request(Operators.java:2570)\n    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.request(FluxMapFuseable.java:171)\n    at reactor.core.publisher.Operators$MultiSubscriptionSubscriber.set(Operators.java:2366)\n    at reactor.core.publisher.FluxOnErrorResume$ResumeSubscriber.onSubscribe(FluxOnErrorResume.java:74)\n    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onSubscribe(FluxMapFuseable.java:96)\n    at reactor.core.publisher.MonoJust.subscribe(MonoJust.java:55)\n    at reactor.core.publisher.InternalMonoOperator.subscribe(InternalMonoOperator.java:76)\n    at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:165)\n    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onNext(FluxMapFuseable.java:129)\n    at reactor.core.publisher.Operators$ScalarSubscription.request(Operators.java:2570)\n    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.request(FluxMapFuseable.java:171)\n    at reactor.core.publisher.MonoFlatMap$FlatMapMain.request(MonoFlatMap.java:194)\n    at reactor.core.publisher.MonoFlatMap$FlatMapMain.request(MonoFlatMap.java:194)\n    at reactor.core.publisher.MonoFlatMap$FlatMapMain.request(MonoFlatMap.java:194)\n    at reactor.core.publisher.MonoFlatMap$FlatMapMain.request(MonoFlatMap.java:194)\n    at reactor.core.publisher.MonoFlatMap$FlatMapMain.request(MonoFlatMap.java:194)\n    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.request(FluxMapFuseable.java:171)\n    at reactor.core.publisher.MonoFlatMap$FlatMapMain.request(MonoFlatMap.java:194)\n    at reactor.core.publisher.MonoFlatMap$FlatMapMain.request(MonoFlatMap.java:194)\n    at reactor.core.publisher.MonoFlatMap$FlatMapMain.request(MonoFlatMap.java:194)\n    at reactor.core.publisher.Operators$MultiSubscriptionSubscriber.set(Operators.java:2366)\n    at reactor.core.publisher.FluxOnErrorResume$ResumeSubscriber.onSubscribe(FluxOnErrorResume.java:74)\n    at reactor.core.publisher.MonoFlatMap$FlatMapMain.onSubscribe(MonoFlatMap.java:117)\n    at reactor.core.publisher.MonoFlatMap$FlatMapMain.onSubscribe(MonoFlatMap.java:117)\n    at reactor.core.publisher.MonoFlatMap$FlatMapMain.onSubscribe(MonoFlatMap.java:117)\n    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onSubscribe(FluxMapFuseable.java:96)\n    at reactor.core.publisher.MonoFlatMap$FlatMapMain.onSubscribe(MonoFlatMap.java:117)\n    at reactor.core.publisher.MonoFlatMap$FlatMapMain.onSubscribe(MonoFlatMap.java:117)\n    at reactor.core.publisher.MonoFlatMap$FlatMapMain.onSubscribe(MonoFlatMap.java:117)\n    at reactor.core.publisher.MonoFlatMap$FlatMapMain.onSubscribe(MonoFlatMap.java:117)\n    at reactor.core.publisher.MonoFlatMap$FlatMapMain.onSubscribe(MonoFlatMap.java:117)\n    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onSubscribe(FluxMapFuseable.java:96)\n    at reactor.core.publisher.MonoJust.subscribe(MonoJust.java:55)\n    at reactor.core.publisher.InternalMonoOperator.subscribe(InternalMonoOperator.java:76)\n    at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:165)\n    at reactor.core.publisher.MonoFlatMap$FlatMapMain.secondComplete(MonoFlatMap.java:245)\n    at reactor.core.publisher.MonoFlatMap$FlatMapInner.onNext(MonoFlatMap.java:305)\n    at reactor.core.publisher.FluxMap$MapSubscriber.onNext(FluxMap.java:122)\n    at reactor.core.publisher.FluxOnErrorResume$ResumeSubscriber.onNext(FluxOnErrorResume.java:79)\n    at reactor.core.publisher.MonoFlatMap$FlatMapMain.secondComplete(MonoFlatMap.java:245)\n    at reactor.core.publisher.MonoFlatMap$FlatMapInner.onNext(MonoFlatMap.java:305)\n    at reactor.core.publisher.Operators$BaseFluxToMonoOperator.completePossiblyEmpty(Operators.java:2096)\n    at reactor.core.publisher.FluxDefaultIfEmpty$DefaultIfEmptySubscriber.onComplete(FluxDefaultIfEmpty.java:134)\n    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onComplete(FluxMapFuseable.java:152)\n    at reactor.core.publisher.MonoFlatMap$FlatMapMain.onComplete(MonoFlatMap.java:189)\n    at reactor.core.publisher.FluxFilterFuseable$FilterFuseableSubscriber.onComplete(FluxFilterFuseable.java:171)\n    at reactor.core.publisher.Operators$ScalarSubscription.request(Operators.java:2572)\n    at reactor.core.publisher.FluxFilterFuseable$FilterFuseableSubscriber.request(FluxFilterFuseable.java:191)\n    at reactor.core.publisher.MonoFlatMap$FlatMapMain.request(MonoFlatMap.java:194)\n    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.request(FluxMapFuseable.java:171)\n    at reactor.core.publisher.FluxDefaultIfEmpty$DefaultIfEmptySubscriber.request(FluxDefaultIfEmpty.java:98)\n    at reactor.core.publisher.MonoFlatMap$FlatMapInner.onSubscribe(MonoFlatMap.java:291)\n    at reactor.core.publisher.Operators$BaseFluxToMonoOperator.onSubscribe(Operators.java:2050)\n    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onSubscribe(FluxMapFuseable.java:96)\n    at reactor.core.publisher.MonoFlatMap$FlatMapMain.onSubscribe(MonoFlatMap.java:117)\n    at reactor.core.publisher.FluxFilterFuseable$FilterFuseableSubscriber.onSubscribe(FluxFilterFuseable.java:87)\n    at reactor.core.publisher.MonoJust.subscribe(MonoJust.java:55)\n    at reactor.core.publisher.InternalMonoOperator.subscribe(InternalMonoOperator.java:76)\n    at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:165)\n    at reactor.core.publisher.MonoFlatMap$FlatMapMain.secondComplete(MonoFlatMap.java:245)\n    at reactor.core.publisher.MonoFlatMap$FlatMapInner.onNext(MonoFlatMap.java:305)\n    at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:158)\n    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onNext(FluxMapFuseable.java:129)\n    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onNext(FluxMapFuseable.java:129)\n    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onNext(FluxMapFuseable.java:129)\n    at reactor.core.publisher.MonoFlatMap$FlatMapMain.secondComplete(MonoFlatMap.java:245)\n    at reactor.core.publisher.MonoFlatMap$FlatMapInner.onNext(MonoFlatMap.java:305)\n    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onNext(FluxMapFuseable.java:129)\n    at reactor.core.publisher.Operators$ScalarSubscription.request(Operators.java:2570)\n    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.request(FluxMapFuseable.java:171)\n    at reactor.core.publisher.MonoFlatMap$FlatMapInner.onSubscribe(MonoFlatMap.java:291)\n    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onSubscribe(FluxMapFuseable.java:96)\n    at reactor.core.publisher.MonoJust.subscribe(MonoJust.java:55)\n    at reactor.core.publisher.InternalMonoOperator.subscribe(InternalMonoOperator.java:76)\n    at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:165)\n    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onNext(FluxMapFuseable.java:129)\n    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onNext(FluxMapFuseable.java:129)\n    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onNext(FluxMapFuseable.java:129)\n    at reactor.core.publisher.Operators$ScalarSubscription.request(Operators.java:2570)\n    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.request(FluxMapFuseable.java:171)\n    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.request(FluxMapFuseable.java:171)\n    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.request(FluxMapFuseable.java:171)\n    at reactor.core.publisher.MonoFlatMap$FlatMapMain.request(MonoFlatMap.java:194)\n    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.request(FluxMapFuseable.java:171)\n    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.request(FluxMapFuseable.java:171)\n    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.request(FluxMapFuseable.java:171)\n    at reactor.core.publisher.MonoFlatMap$FlatMapMain.request(MonoFlatMap.java:194)\n    at reactor.core.publisher.MonoFlatMap$FlatMapInner.onSubscribe(MonoFlatMap.java:291)\n    at reactor.core.publisher.MonoFlatMap$FlatMapMain.onSubscribe(MonoFlatMap.java:117)\n    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onSubscribe(FluxMapFuseable.java:96)\n    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onSubscribe(FluxMapFuseable.java:96)\n    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onSubscribe(FluxMapFuseable.java:96)\n    at reactor.core.publisher.MonoFlatMap$FlatMapMain.onSubscribe(MonoFlatMap.java:117)\n    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onSubscribe(FluxMapFuseable.java:96)\n    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onSubscribe(FluxMapFuseable.java:96)\n    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onSubscribe(FluxMapFuseable.java:96)\n    at reactor.core.publisher.MonoJust.subscribe(MonoJust.java:55)\n    at reactor.core.publisher.InternalMonoOperator.subscribe(InternalMonoOperator.java:76)\n    at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:165)\n    at reactor.core.publisher.FluxHide$SuppressFuseableSubscriber.onNext(FluxHide.java:137)\n    at reactor.core.publisher.FluxOnErrorResume$ResumeSubscriber.onNext(FluxOnErrorResume.java:79)\n    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onNext(FluxMapFuseable.java:129)\n    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onNext(FluxMapFuseable.java:129)\n    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onNext(FluxMapFuseable.java:129)\n    at reactor.core.publisher.Operators$ScalarSubscription.request(Operators.java:2570)\n    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.request(FluxMapFuseable.java:171)\n    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.request(FluxMapFuseable.java:171)\n    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.request(FluxMapFuseable.java:171)\n    at reactor.core.publisher.Operators$MultiSubscriptionSubscriber.set(Operators.java:2366)\n    at reactor.core.publisher.FluxOnErrorResume$ResumeSubscriber.onSubscribe(FluxOnErrorResume.java:74)\n    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onSubscribe(FluxMapFuseable.java:96)\n    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onSubscribe(FluxMapFuseable.java:96)\n    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onSubscribe(FluxMapFuseable.java:96)\n    at reactor.core.publisher.MonoJust.subscribe(MonoJust.java:55)\n    at reactor.core.publisher.Mono.subscribe(Mono.java:4576)\n    at reactor.core.publisher.FluxFlatMap.trySubscribeScalarMap(FluxFlatMap.java:205)\n    at reactor.core.publisher.MonoFlatMap.subscribeOrReturn(MonoFlatMap.java:53)\n    at reactor.core.publisher.InternalMonoOperator.subscribe(InternalMonoOperator.java:63)\n    at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:165)\n    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onNext(FluxMapFuseable.java:129)\n    at reactor.core.publisher.MonoFlatMap$FlatMapMain.secondComplete(MonoFlatMap.java:245)\n    at reactor.core.publisher.MonoFlatMap$FlatMapInner.onNext(MonoFlatMap.java:305)\n    at reactor.core.publisher.FluxOnErrorResume$ResumeSubscriber.onNext(FluxOnErrorResume.java:79)\n    at reactor.core.publisher.MonoPeekTerminal$MonoTerminalPeekSubscriber.onNext(MonoPeekTerminal.java:180)\n    at reactor.core.publisher.FluxPeekFuseable$PeekFuseableConditionalSubscriber.onNext(FluxPeekFuseable.java:503)\n    at reactor.core.publisher.FluxMapFuseable$MapFuseableConditionalSubscriber.onNext(FluxMapFuseable.java:299)\n    at reactor.core.publisher.MonoFlatMap$FlatMapMain.secondComplete(MonoFlatMap.java:245)\n    at reactor.core.publisher.MonoFlatMap$FlatMapInner.onNext(MonoFlatMap.java:305)\n    at reactor.core.publisher.FluxOnErrorResume$ResumeSubscriber.onNext(FluxOnErrorResume.java:79)\n    at reactor.core.publisher.Operators$BaseFluxToMonoOperator.completePossiblyEmpty(Operators.java:2096)\n    at reactor.core.publisher.FluxDefaultIfEmpty$DefaultIfEmptySubscriber.onComplete(FluxDefaultIfEmpty.java:134)\n    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onComplete(FluxMapFuseable.java:152)\n    at reactor.core.publisher.FluxFilterFuseable$FilterFuseableSubscriber.onComplete(FluxFilterFuseable.java:171)\n    at reactor.core.publisher.Operators$ScalarSubscription.request(Operators.java:2572)\n    at reactor.core.publisher.FluxFilterFuseable$FilterFuseableSubscriber.request(FluxFilterFuseable.java:191)\n    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.request(FluxMapFuseable.java:171)\n    at reactor.core.publisher.FluxDefaultIfEmpty$DefaultIfEmptySubscriber.request(FluxDefaultIfEmpty.java:98)\n    at reactor.core.publisher.Operators$MultiSubscriptionSubscriber.set(Operators.java:2366)\n    at reactor.core.publisher.FluxOnErrorResume$ResumeSubscriber.onSubscribe(FluxOnErrorResume.java:74)\n    at reactor.core.publisher.Operators$BaseFluxToMonoOperator.onSubscribe(Operators.java:2050)\n    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onSubscribe(FluxMapFuseable.java:96)\n    at reactor.core.publisher.FluxFilterFuseable$FilterFuseableSubscriber.onSubscribe(FluxFilterFuseable.java:87)\n    at reactor.core.publisher.MonoJust.subscribe(MonoJust.java:55)\n    at reactor.core.publisher.InternalMonoOperator.subscribe(InternalMonoOperator.java:76)\n    at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:165)\n    at reactor.core.publisher.MonoFlatMap$FlatMapMain.secondComplete(MonoFlatMap.java:245)\n    at reactor.core.publisher.MonoFlatMap$FlatMapInner.onNext(MonoFlatMap.java:305)\n    at reactor.core.publisher.FluxMap$MapSubscriber.onNext(FluxMap.java:122)\n    at reactor.core.publisher.MonoUsingWhen$MonoUsingWhenSubscriber.deferredComplete(MonoUsingWhen.java:268)\n    at reactor.core.publisher.FluxUsingWhen$CommitInner.onComplete(FluxUsingWhen.java:532)\n    at reactor.core.publisher.Operators.complete(Operators.java:137)\n    at reactor.core.publisher.MonoEmpty.subscribe(MonoEmpty.java:46)\n    at reactor.core.publisher.Mono.subscribe(Mono.java:4576)\n    at reactor.core.publisher.FluxUsingWhen$UsingWhenSubscriber.onComplete(FluxUsingWhen.java:389)\n    at reactor.core.publisher.MonoFlatMap$FlatMapMain.secondComplete(MonoFlatMap.java:246)\n    at reactor.core.publisher.MonoFlatMap$FlatMapInner.onNext(MonoFlatMap.java:305)\n    at reactor.core.publisher.MonoFlatMap$FlatMapMain.onNext(MonoFlatMap.java:158)\n    at reactor.core.publisher.FluxMapFuseable$MapFuseableSubscriber.onNext(FluxMapFuseable.java:129)\n    at reactor.core.publisher.Operators$BaseFluxToMonoOperator.completePossiblyEmpty(Operators.java:2096)\n    at reactor.core.publisher.MonoTakeLastOne$TakeLastOneSubscriber.onComplete(MonoTakeLastOne.java:162)\n    at reactor.core.publisher.Operators$MultiSubscriptionSubscriber.onComplete(Operators.java:2230)\n    at reactor.core.publisher.MonoFlatMapMany$FlatMapManyInner.onComplete(MonoFlatMapMany.java:261)\n    at reactor.core.publisher.FluxMap$MapSubscriber.onComplete(FluxMap.java:144)\n    at reactor.core.publisher.Operators$MultiSubscriptionSubscriber.onComplete(Operators.java:2230)\n    at reactor.core.publisher.MonoNext$NextSubscriber.onComplete(MonoNext.java:102)\n    at reactor.core.publisher.MonoNext$NextSubscriber.onNext(MonoNext.java:83)\n    at reactor.core.publisher.MonoNext$NextSubscriber.onNext(MonoNext.java:82)\n    at reactor.core.publisher.MonoFlatMap$FlatMapMain.secondComplete(MonoFlatMap.java:245)\n    at reactor.core.publisher.MonoFlatMap$FlatMapInner.onNext(MonoFlatMap.java:305)\n    at reactor.core.publisher.MonoPeekTerminal$MonoTerminalPeekSubscriber.onNext(MonoPeekTerminal.java:180)\n    at reactor.core.publisher.MonoCreate$DefaultMonoSink.success(MonoCreate.java:176)\n    at com.mongodb.reactivestreams.client.internal.MongoOperationPublisher.lambda$sinkToCallback$33(MongoOperationPublisher.java:524)\n    at com.mongodb.reactivestreams.client.internal.OperationExecutorImpl.lambda$execute$9(OperationExecutorImpl.java:126)\n    at com.mongodb.internal.async.ErrorHandlingResultCallback.onResult(ErrorHandlingResultCallback.java:47)\n    at com.mongodb.internal.operation.AsyncOperationHelper.lambda$exceptionTransformingCallback$17(AsyncOperationHelper.java:335)\n    at com.mongodb.internal.async.function.AsyncCallbackSupplier.lambda$whenComplete$1(AsyncCallbackSupplier.java:97)\n    at com.mongodb.internal.async.function.RetryingAsyncCallbackSupplier$RetryingCallback.onResult(RetryingAsyncCallbackSupplier.java:123)\n    at com.mongodb.internal.async.ErrorHandlingResultCallback.onResult(ErrorHandlingResultCallback.java:47)\n    at com.mongodb.internal.async.function.AsyncCallbackSupplier.lambda$whenComplete$1(AsyncCallbackSupplier.java:97)\n    at com.mongodb.internal.async.ErrorHandlingResultCallback.onResult(ErrorHandlingResultCallback.java:47)\n    at com.mongodb.internal.async.function.AsyncCallbackSupplier.lambda$whenComplete$1(AsyncCallbackSupplier.java:97)\n    at com.mongodb.internal.operation.MixedBulkWriteOperation.lambda$executeBulkWriteBatchAsync$9(MixedBulkWriteOperation.java:352)\n    at com.mongodb.internal.async.function.AsyncCallbackLoop$LoopingCallback.onResult(AsyncCallbackLoop.java:85)\n    at com.mongodb.internal.async.function.AsyncCallbackLoop$LoopingCallback.onResult(AsyncCallbackLoop.java:62)\n    at com.mongodb.internal.async.function.LoopState.breakAndCompleteIf(LoopState.java:113)\n    at com.mongodb.internal.operation.MixedBulkWriteOperation.lambda$executeBulkWriteBatchAsync$8(MixedBulkWriteOperation.java:300)\n    at com.mongodb.internal.async.function.AsyncCallbackLoop$LoopingCallback.onResult(AsyncCallbackLoop.java:83)\n    at com.mongodb.internal.async.function.AsyncCallbackLoop$LoopingCallback.onResult(AsyncCallbackLoop.java:62)\n    at com.mongodb.internal.operation.MixedBulkWriteOperation.lambda$executeBulkWriteBatchAsync$7(MixedBulkWriteOperation.java:322)\n    at com.mongodb.internal.async.ErrorHandlingResultCallback.onResult(ErrorHandlingResultCallback.java:47)\n    at com.mongodb.internal.connection.DefaultServer$DefaultServerProtocolExecutor.lambda$executeAsync$0(DefaultServer.java:249)\n    at com.mongodb.internal.async.ErrorHandlingResultCallback.onResult(ErrorHandlingResultCallback.java:47)\n    at com.mongodb.internal.connection.CommandProtocolImpl.lambda$executeAsync$0(CommandProtocolImpl.java:88)\n    at com.mongodb.internal.connection.DefaultConnectionPool$PooledConnection.lambda$sendAndReceiveAsync$1(DefaultConnectionPool.java:774)\n    at com.mongodb.internal.connection.UsageTrackingInternalConnection.lambda$sendAndReceiveAsync$1(UsageTrackingInternalConnection.java:150)\n    at com.mongodb.internal.async.ErrorHandlingResultCallback.onResult(ErrorHandlingResultCallback.java:47)\n    at com.mongodb.internal.connection.InternalStreamConnection.lambda$sendCommandMessageAsync$0(InternalStreamConnection.java:532)\n    at com.mongodb.internal.connection.InternalStreamConnection$MessageHeaderCallback$MessageCallback.onResult(InternalStreamConnection.java:826)\n    at com.mongodb.internal.connection.InternalStreamConnection$MessageHeaderCallback$MessageCallback.onResult(InternalStreamConnection.java:789)\n    at com.mongodb.internal.connection.InternalStreamConnection$3.completed(InternalStreamConnection.java:648)\n    at com.mongodb.internal.connection.InternalStreamConnection$3.completed(InternalStreamConnection.java:645)\n    at com.mongodb.internal.connection.AsynchronousChannelStream$BasicCompletionHandler.completed(AsynchronousChannelStream.java:245)\n    at com.mongodb.internal.connection.AsynchronousChannelStream$BasicCompletionHandler.completed(AsynchronousChannelStream.java:228)\n    at java.base/sun.nio.ch.Invoker.invokeUnchecked(Invoker.java:129)\n    at java.base/sun.nio.ch.Invoker.invokeUnchecked(Invoker.java:284)\n    at java.base/sun.nio.ch.WindowsAsynchronousSocketChannelImpl$ReadTask.completed(WindowsAsynchronousSocketChannelImpl.java:586)\n    at java.base/sun.nio.ch.Iocp$EventHandlerTask.run(Iocp.java:387)\n    at java.base/sun.nio.ch.AsynchronousChannelGroupImpl$1.run(AsynchronousChannelGroupImpl.java:113)\n    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)\n    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)\n    at java.base/java.lang.Thread.run(Thread.java:842)\n</code></pre>\n"
  }, {
    "tags" : [ "python", "java" ],
    "owner" : {
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      "display_name" : "Amit_45",
      "link" : "https://stackoverflow.com/users/31524773/amit-45"
    },
    "is_answered" : false,
    "view_count" : 107,
    "closed_date" : 1764777703,
    "answer_count" : 0,
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    "last_activity_date" : 1764775940,
    "creation_date" : 1764775777,
    "last_edit_date" : 1764775940,
    "question_id" : 79837052,
    "link" : "https://stackoverflow.com/questions/79837052/how-does-garbage-collection-differ-between-python-and-java-and-when-do-objects",
    "closed_reason" : "Needs more focus",
    "title" : "How does garbage collection differ between Python and Java, and when do objects actually get destroyed?",
    "body" : "<p>I'm trying to understand how garbage collection works in Python vs Java.</p>\n<p>From what I know:</p>\n<ul>\n<li><p>Python uses reference counting + a garbage collector</p>\n</li>\n<li><p>Java uses an automatic garbage collector based on JVM</p>\n</li>\n</ul>\n<p>But I'm confused about when objects are actually destroyed in both languages.</p>\n<p>For example:</p>\n<ul>\n<li><p>Python code</p>\n<pre class=\"lang-py prettyprint-override\"><code>class A:\n    def __del__(self):\n        print(&quot;Destroyed&quot;)\n\nobj = A()\nobj = None\nprint(&quot;End&quot;)\n</code></pre>\n<p>Sometimes <code>__del__</code> prints immediately, and sometimes it doesn't (especially when using circular references).</p>\n</li>\n<li><p>Java code</p>\n<pre class=\"lang-java prettyprint-override\"><code>class A {\n    protected void finalize() {\n        System.out.println(&quot;Destroyed&quot;);\n    }\n}\n\npublic class Main {\n    public static void main(String[] args) {\n        A obj = new A();\n        obj = null;\n        System.out.println(&quot;End&quot;);\n    }\n}\n</code></pre>\n<p>In Java, the <code>finalize()</code> method doesn’t always run before the program ends.</p>\n</li>\n</ul>\n<p>My questions:</p>\n<ol>\n<li><p>When exactly does object destruction happen in Python and Java?</p>\n</li>\n<li><p>Is there a way in either language to force object destruction?</p>\n</li>\n<li><p>Why does <code>__del__</code> in Python behave differently in some cases?</p>\n</li>\n</ol>\n"
  }, {
    "tags" : [ "java", "spring", "mongodb" ],
    "owner" : {
      "account_id" : 30652349,
      "reputation" : 1,
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      "display_name" : "Investia.tech",
      "link" : "https://stackoverflow.com/users/23498477/investia-tech"
    },
    "is_answered" : false,
    "view_count" : 75,
    "closed_date" : 1764765941,
    "answer_count" : 1,
    "score" : -3,
    "last_activity_date" : 1764766161,
    "creation_date" : 1764765651,
    "question_id" : 79836893,
    "link" : "https://stackoverflow.com/questions/79836893/spring-boot-4-0-0-with-a-mongodb-database-the-properties-in-application-propert",
    "closed_reason" : "Duplicate",
    "title" : "Spring Boot 4.0.0 with a MongoDB database, the properties in application.properties are not working",
    "body" : "<p>The properties in the <code>application.properties</code> file are not working. The application connects to the <code>test</code> database instead of the one specified in the <code>application.properties</code> file, and it also connects without any credentials credential=null.</p>\n<pre><code>spring.data.mongodb.host=localhost\nspring.data.mongodb.port=27017\nspring.data.mongodb.database=newsletter\nspring.data.mongodb.username=newsletter_user\nspring.data.mongodb.password=secret\nspring.data.mongodb.authentication-database=admin\n</code></pre>\n<p>I also try uri:</p>\n<pre><code>spring.data.mongodb.uri=mongodb://newsletter_user:secret@localhost:27017/newsletter?authSource=admin\n</code></pre>\n<p>Import application.yml</p>\n<pre><code>implementation(&quot;org.springframework.boot:spring-boot-starter-data-mongodb&quot;)\n</code></pre>\n<p>The temporary workaround I managed to implement is using a configuration <code>@Bean</code>.</p>\n<pre><code>package tech.investia.newsletter.configs;\n\nimport com.mongodb.ConnectionString;\nimport com.mongodb.MongoClientSettings;\nimport com.mongodb.client.MongoClient;\nimport com.mongodb.client.MongoClients;\nimport org.springframework.context.annotation.Bean;\nimport org.springframework.context.annotation.Configuration;\nimport org.springframework.data.mongodb.core.MongoTemplate;\n\n@Configuration\npublic class MongoConfig {\n    private static final String MONGO_URI =\n            &quot;mongodb://newsletter_user:secret@localhost:27017/newsletter?authSource=admin&quot;;\n\n    @Bean\n    public MongoClient mongoClient() {\n        ConnectionString cs = new ConnectionString(MONGO_URI);\n\n        MongoClientSettings settings = MongoClientSettings.builder()\n                .applyConnectionString(cs)\n                .build();\n\n        return MongoClients.create(settings);\n    }\n\n    @Bean\n    public MongoTemplate mongoTemplate(MongoClient mongoClient) {\n        ConnectionString cs = new ConnectionString(MONGO_URI);\n        assert cs.getDatabase() != null;\n        return new MongoTemplate(mongoClient, cs.getDatabase());\n    }\n}\n</code></pre>\n"
  }, {
    "tags" : [ "java", "android", "kotlin" ],
    "owner" : {
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      "display_name" : "Shah Suhail",
      "link" : "https://stackoverflow.com/users/18578047/shah-suhail"
    },
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    "creation_date" : 1764762213,
    "last_edit_date" : 1764763686,
    "question_id" : 79836830,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79836830/how-to-use-callbacks-in-android-kotlin",
    "title" : "How to use Callbacks in Android Kotlin",
    "body" : "<p>Callbacks in Adapter :- If i having an adapter and there i having a button onto which i want to click and pass that value to the activity inorder to navigate or toast something on the screen.</p>\n"
  }, {
    "tags" : [ "java", "spring", "hibernate", "jpa", "pgvector" ],
    "owner" : {
      "account_id" : 44226426,
      "reputation" : 21,
      "user_id" : 31642875,
      "user_type" : "registered",
      "profile_image" : "https://i.sstatic.net/TwsbxWJj.png?s=256",
      "display_name" : "Iwan de Jong",
      "link" : "https://stackoverflow.com/users/31642875/iwan-de-jong"
    },
    "is_answered" : true,
    "view_count" : 37,
    "answer_count" : 1,
    "score" : 1,
    "last_activity_date" : 1764832132,
    "creation_date" : 1764760794,
    "last_edit_date" : 1764775937,
    "question_id" : 79836804,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79836804/hibernate-invalid-stream-header-0-when-trying-to-deserialize-pgvector-embe",
    "title" : "Hibernate: Invalid stream header &quot;[-0.&quot; when trying to deserialize pgvector embedding into JPA entity",
    "body" : "<p>I created a PGvector database:</p>\n<pre class=\"lang-sql prettyprint-override\"><code>CREATE TABLE IF NOT EXISTS vector_store (\n    id uuid DEFAULT uuid_generate_v4() PRIMARY KEY,\n    content text,\n    metadata jsonb,\n    embedding vector(1024),\n    created_at timestamptz DEFAULT now()\n);\n</code></pre>\n<p>and defined a JPA entity following <a href=\"https://docs.hibernate.org/orm/current/userguide/html_single/#vector-module\" rel=\"nofollow noreferrer\">Hibernate's documentation regarding vectors</a>:</p>\n<pre class=\"lang-java prettyprint-override\"><code>@Entity\n@Table(name = &quot;vector_store&quot;)\npublic class Document {\n    @Id\n    @Column(columnDefinition = &quot;uuid&quot;)\n    private UUID id;\n\n    @Column(columnDefinition = &quot;text&quot;)\n    private String content;\n\n    @JdbcTypeCode(SqlTypes.JSON)\n    @Column(columnDefinition = &quot;jsonb&quot;)\n    private LogMetadata metadata;\n\n    @JdbcTypeCode(SqlTypes.VECTOR)\n    @Column(columnDefinition = &quot;vector(1024)&quot;)\n    @Array(length = 1024)\n    private double[] embedding;\n\n    // getters and setters\n}\n</code></pre>\n<p>However, when trying to deserialize the embedding into a Document object,</p>\n<pre class=\"lang-java prettyprint-override\"><code>public List&lt;Document&gt; fetchAllDocuments() {\n    return documentRepository.findAll();\n}\n</code></pre>\n<p>I get the following error:</p>\n<pre><code>org.hibernate.type.SerializationException: could not deserialize\n...\njava.io.StreamCorruptedException: invalid stream header: 5B2D302E\n</code></pre>\n<p>Info: <code>5B2D302E</code> translates to <code>[-0.</code>, which is the first few characters of the embedding of an entry.</p>\n<p>I tried <code>SqlTypes.VECTOR_FLOAT64</code> as well, but without luck.</p>\n<p>Any idea what this could be?</p>\n"
  }, {
    "tags" : [ "java", "android", "kotlin", "android-studio", "android-studio-3.0" ],
    "owner" : {
      "account_id" : 19057866,
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      "profile_image" : "https://i.sstatic.net/eA0GSyzv.jpg?s=256",
      "display_name" : "Ankit Kumar",
      "link" : "https://stackoverflow.com/users/13914597/ankit-kumar"
    },
    "is_answered" : false,
    "view_count" : 30,
    "answer_count" : 0,
    "score" : 0,
    "last_activity_date" : 1764744234,
    "creation_date" : 1764744234,
    "question_id" : 79836589,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79836589/cannot-import-place-field-name-lat-lng-address-in-google-places-sdk-5-x",
    "title" : "Cannot import Place.Field.NAME, LAT_LNG, ADDRESS in Google Places SDK 5.x",
    "body" : "<p>I am using the new Google Places SDK in my Android app.</p>\n<pre><code>places = &quot;5.1.1&quot;\nplaces = { module = &quot;com.google.android.libraries.places:places&quot;, version.ref = &quot;places&quot; }\n\n   val fields: List&lt;Place.Field&gt; = listOf(\n            Place.Field.ID,\n            Place.Fie\n\nld.NAME,\n            Place.Field.LAT_LNG,\n            Place.Field.ADDRESS\n        )\n\n        val intent = Autocomplete.IntentBuilder(AutocompleteActivityMode.FULLSCREEN, fields)\n            .setCountry(&quot;IN&quot;)\n            .build(this)\n</code></pre>\n<p>But the class doesn't contain these fields.</p>\n<p><strong>What is the correct dependency or import for accessing Place.Field in the latest Places SDK?</strong></p>\n"
  }, {
    "tags" : [ "java", "xstream", "java-module" ],
    "owner" : {
      "account_id" : 2152669,
      "reputation" : 1762,
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      "display_name" : "Thomas",
      "link" : "https://stackoverflow.com/users/1945316/thomas"
    },
    "is_answered" : true,
    "view_count" : 68,
    "answer_count" : 3,
    "score" : 0,
    "last_activity_date" : 1764804841,
    "creation_date" : 1764710538,
    "last_edit_date" : 1764771649,
    "question_id" : 79836333,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79836333/java-module-system-breaking-serialization-of-standard-library-classes-is-there",
    "title" : "Java Module System Breaking Serialization of Standard Library Classes - Is there a better solution than --add-opens?",
    "body" : "<h2>Problem</h2>\n<p>When serializing Java standard library classes (like <code>java.awt.Rectangle</code>, <code>Point</code>, <code>Dimension</code>, etc.) using frameworks like XStream, Jackson, or Gson, I'm forced to use <code>--add-opens</code> flags:</p>\n<pre class=\"lang-bash prettyprint-override\"><code>--add-opens java.desktop/java.awt=ALL-UNNAMED\n</code></pre>\n<p>This is required because serialization frameworks need deep reflection access to private fields, but the module system blocks this even though my code properly declares module dependencies:</p>\n<pre class=\"lang-java prettyprint-override\"><code>module my.app {\n    requires java.desktop;  // Not sufficient for reflection!\n}\n</code></pre>\n<h2>The Core Issue</h2>\n<p><strong>I cannot open another module's packages from my <code>module-info.java</code></strong> - only the owning module can do that. The <code>opens</code> directive only works for your own packages:</p>\n<pre class=\"lang-java prettyprint-override\"><code>module my.app {\n    opens my.package to com.thoughtworks.xstream;  // ✓ Works for MY packages\n    requires java.desktop;                          // ✗ Doesn't open THEIR packages\n}\n</code></pre>\n<p>This design seems fundamentally broken for legitimate serialization use cases.</p>\n<h2>Why This Matters</h2>\n<ol>\n<li><strong><code>--add-opens</code> is a maintenance nightmare</strong> - Must track all affected modules across JDK versions</li>\n<li><strong>Runtime-only solution</strong> - Can't be declared in code, hard to discover when missing</li>\n<li><strong>Standard library classes aren't exotic</strong> - These are normal, stable public APIs (<code>Rectangle</code>, <code>Color</code>, <code>File</code>, etc.)</li>\n<li><strong>Affects all reflection-based frameworks</strong> - Not just serialization but also ORMs, testing frameworks, etc.</li>\n</ol>\n<h2>Questions</h2>\n<ol>\n<li><p><strong>Is there a comprehensive library providing serialization converters/adapters for common JDK classes?</strong> Specifically looking for XStream converters, but interested in solutions for Jackson/Gson as well.</p>\n</li>\n<li><p><strong>Why doesn't the JDK provide a &quot;serialization-friendly&quot; module</strong> that explicitly opens these stable classes for reflection? Something like <code>java.desktop.reflection</code> that could be optionally required?</p>\n</li>\n<li><p><strong>Are there any proposals or JEPs addressing this friction between modules and reflection?</strong></p>\n</li>\n</ol>\n<h2>What might be a solution?</h2>\n<ul>\n<li><strong>DTOs/wrapper classes</strong> - Too much boilerplate for dozens of JDK classes</li>\n<li><strong>Custom converters</strong> - Works but requires writing converters for every JDK class I serialize</li>\n</ul>\n<h2>Context</h2>\n<ul>\n<li>Using XStream for configuration serialization</li>\n<li>Need to serialize complex object graphs containing AWT geometry classes</li>\n<li>Java 17+, modular application</li>\n</ul>\n"
  }, {
    "tags" : [ "java", "intellij-idea", "jvm", "aspectj" ],
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    "last_edit_date" : 1764751253,
    "question_id" : 79836329,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79836329/how-to-define-run-debug-configuration-templates-per-module",
    "title" : "How to define Run/Debug configuration templates per module?",
    "body" : "<p>Is it achievable in any way, shape or form, to be able to create a JUnit Run/Debug configuration template that has VM argument <code>-javaagent</code> and it being applied to only one of many modules?</p>\n<p>I have multiple modules, and one is called acceptance-tests, and only in this module I am using an AspectJ weaver, thus needing an aspectjweaver -javaagent. In another module there are unit tests, but when running them from the IDE I don't want the VM argument with aspectjweaver -javaagent to propagate to these unit tests, because it only throws errors and nothing else.</p>\n<p>I am using the IntelliJ's &quot;green arrow&quot; runner to run test in various places in various amounts, thus the need for the template, but it is completely unnecessary in other modules.</p>\n<p>If need be, I can implement any other strategy that allows for restricting this VM argument to only one module. I tried attaching it to the currently running JVM, which works, but it is being attached after all classes are loaded so it doesn't weave anything.</p>\n"
  }, {
    "tags" : [ "java", "spring-boot", "amazon-elasticache", "lettuce", "valkey" ],
    "owner" : {
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      "display_name" : "alex",
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    "last_activity_date" : 1764825152,
    "creation_date" : 1764707004,
    "last_edit_date" : 1764713808,
    "question_id" : 79836300,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79836300/java-springboot-talking-to-elasticache-api-calls-fail-during-ecs-tasks-auto-sc",
    "title" : "Java Springboot talking to Elasticache - API calls fail during ecs tasks auto-scaling",
    "body" : "<p>Java Springboot application talks to Aws Elasticache using Lettuce client running on ECS.</p>\n<p>Springboot version 3.4.5\nLettuce version 6.8.1.RELEASE\nElasticache Valkey serverless using IAM authentication</p>\n<p>Observed weird behavior during Load test. When ECS tasks auto-scaling kicks off on high load (cpu &gt;50%) during 500rps,</p>\n<ul>\n<li>API latency spikes</li>\n<li>API calls timeout with 504</li>\n<li>elasticache commands fail with connection timeout, command timeout</li>\n<li>Ecs tasks health check fails and tasks get created/killed continuously in a loop for a while</li>\n</ul>\n<p>It takes ~30mins for the tasks to scale up properly, then everything settles down and APIs behave normally.</p>\n<p>Auto-scale policy triggers when:\nCPU utilization &gt;50%\nMemory utilization &gt;50%</p>\n<p>Elasticache config:\nmaxTotal 15\nmaxIdle 8\nminIdle 3\nconnection timeout 3s\ncommand timeout 2s</p>\n<p>What is going wrong here?\nBelow is the elasticache configuration class. Thanks in advance.</p>\n<pre><code>public class ElastiCacheConfig {\n\n@Bean(destroyMethod = &quot;shutdown&quot;)\npublic ClientResources clientResources() {\n    return DefaultClientResources.builder()\n            .ioThreadPoolSize(8)\n            .computationThreadPoolSize(8)\n            .reconnectDelay(Delay.equalJitter(\n                    Duration.ofMillis(100),\n                    Duration.ofSeconds(30),\n                    1, TimeUnit.MILLISECONDS))\n            .build();\n}\n\n@Bean(destroyMethod = &quot;shutdown&quot;)\npublic RedisClient redisClient(ClientResources clientResources) {\n    RedisURI redisURI = RedisURI.builder()\n            .withHost(host)\n            .withPort(6379)\n            .withSsl(true)\n            .withAuthentication(getCredentials())\n            .withTimeout(Duration.ofMillis(3000))\n            .build();\n\n    RedisClient client = RedisClient.create(clientResources, redisURI);\n    client.setOptions(createClientOptions());\n    return client;\n}\n\n@Bean\npublic CompletionStage&lt;BoundedAsyncPool&lt;StatefulRedisConnection&lt;String, String&gt;&gt;&gt; cacheAsyncConnectionPool(RedisClient redisClient) {\n    RedisURI redisURI = RedisURI.builder()\n            .withHost(host)\n            .withPort(port)\n            .withSsl(true)\n            .withAuthentication(getCredentials())\n            .withTimeout(Duration.ofMillis(3000))\n            .build();\n\n    BoundedPoolConfig poolConfig = BoundedPoolConfig.builder()\n            .maxTotal(15)\n            .maxIdle(8)\n            .minIdle(3)\n            .testOnAcquire(true)\n            .testOnCreate(true)\n            .build();\n\n    return AsyncConnectionPoolSupport.createBoundedObjectPoolAsync(\n            () -&gt; redisClient.connectAsync(StringCodec.UTF8, redisURI),\n            poolConfig);\n}\n\nprivate ClientOptions createClientOptions() {\n    return ClientOptions.builder()\n            .pingBeforeActivateConnection(true)\n            .socketOptions(SocketOptions.builder()\n                    .connectTimeout(Duration.ofMillis(3000))\n                    .keepAlive(true)\n                    .tcpNoDelay(true)\n                    .build())\n            .timeoutOptions(TimeoutOptions.builder()\n                    .fixedTimeout(Duration.ofMillis(2000))\n                    .build())\n            .build();\n}\n\nprivate RedisCredentialsProvider getCredentials() {\n    AWSCredentialsProvider awsCredentialsProvider = new DefaultAWSCredentialsProviderChain();\n    IAMAuthTokenRequest iamAuthTokenRequest = new IAMAuthTokenRequest(user, name, region, true);\n    return new RedisIAMAuthCredentialsProvider(\n            user, iamAuthTokenRequest, awsCredentialsProvider);\n}\n</code></pre>\n<p>}</p>\n"
  }, {
    "tags" : [ "java", "bash", "runtime" ],
    "owner" : {
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      "display_name" : "user23282541",
      "link" : "https://stackoverflow.com/users/23282541/user23282541"
    },
    "is_answered" : true,
    "view_count" : 84,
    "closed_date" : 1764702287,
    "answer_count" : 1,
    "score" : -1,
    "last_activity_date" : 1764697036,
    "creation_date" : 1764694670,
    "question_id" : 79836133,
    "link" : "https://stackoverflow.com/questions/79836133/how-to-give-root-access-to-java-runtime-process",
    "closed_reason" : "Not suitable for this site",
    "title" : "How to give root access to Java Runtime Process?",
    "body" : "<p>I am trying to run a bash command through Java.Runtime.exec(), specifically coredumpctl.</p>\n<p>I am only able to run the command on a bash terminal when I login as a root user, and this doesn't seem to be the same permission that the Java.Runtime has.</p>\n<p>Is there any way to modify the Java.Runtime login or grant the Runtime root access?</p>\n"
  }, {
    "tags" : [ "java", "logging", "stream" ],
    "owner" : {
      "account_id" : 2920132,
      "reputation" : 171,
      "user_id" : 5325562,
      "user_type" : "registered",
      "profile_image" : "https://i.sstatic.net/ZffWS.jpg?s=256",
      "display_name" : "Maarten",
      "link" : "https://stackoverflow.com/users/5325562/maarten"
    },
    "is_answered" : true,
    "view_count" : 75,
    "answer_count" : 2,
    "score" : 0,
    "last_activity_date" : 1764842239,
    "creation_date" : 1764691493,
    "last_edit_date" : 1764842239,
    "question_id" : 79836078,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79836078/java-stream-api-logging-inside-a-stream",
    "title" : "java stream api: logging inside a stream",
    "body" : "<p>Disclaimer: The question below was met with quite a bit of critisicm. The only reason I did not delete this question is becasue stackoverflow doesnt let me after somebody reacted on it. Also the code has been altered so lots of the criticism doesnt apply anymore. I did trigger some discussion though. I guess that's good. Maybe this concept will result in an improved new question from me or somebody else. Here it comes:</p>\n<p>I really love the way you can program with java streams as a way to get from an input variable to a output in a series of well defined standardized steps, like map and filter. Therefore it sometimes feel like a pitty to leave this structure. Sometimes it seems easier and more readible to leave this structure, but that might be because a lack of available library functionality, best practices or my knowledge thereof.</p>\n<p>Let's look at this 'old-school' code (well it does have Optional and var so not that old-school)</p>\n<pre><code>public Optional&lt;Address&gt; getValidSupplierAddress(Contact contact) {\n    if (!contact.hadRecentProjects) {\n        log.debug(&quot;contact didn't have any recent projects&quot;);\n        return Optional.empty();\n    }\n    if (!contact.validatedByBoardOfCommerce()) {\n        log.debug(&quot;contact is not validated by board of commerce&quot;);\n        return Optional.empty();\n    }\n    var address = contact.getAddress();\n    if (address == null) {\n        log.debug(&quot;no address specified for contact&quot;);\n        return Optional.empty();\n    }\n    if (address.isPobox()) {\n        log.debug(&quot;address is not valid, no po. box allowed&quot;);\n        return Optional.empty();\n    }\n    return Optional.of(address);\n}\n</code></pre>\n<p>You could write this into something like this:</p>\n<pre><code>public Optional&lt;Address&gt; getValidSupplierAddress(Contact contact) {\n    return Optional.of(contact)\n         .filter(testOrElse(Contact::hadRecentProjects, \n                    () -&gt; log.debug(&quot;contact didn't have any recent projects&quot;)))\n         .filter(testOrElse(Contact::validatedByBoardOfCommerce, \n                    () -&gt; log.debug(&quot;contact is not validated by board of commerce&quot;)))\n         .map(supplier -&gt; Optional.of(supplier.getAddress())\n         .filter(testOrElse(Optional::isPresent, \n                    () -&gt; log.debug(&quot;no address specified for supplier&quot;)))\n         .map(Optional::get)\n         .filter(testOrElse(not(Address::isPobox), \n                    () -&gt; log.debug(&quot;address is not valid, no po. box allowed&quot;)));\n}\n\n    private &lt;X&gt; Predicate&lt;X&gt; testOrElse(Predicate&lt;X&gt; condition, Runnable executeOnFalse) {\n        return condition.or(x1 -&gt; { executeOnFalse.run(); return false; });\n    }\n\n</code></pre>\n<p>Did I make more readable code here or not? Not quite sure yet. I But I guess when there are any library functions that would support an approach similar to this, it might become (even?) more readable. Can anybody improve upon this code, preferrably using existing mainstream libraries?</p>\n"
  }, {
    "tags" : [ "java", "formatting", "classcastexception", "messageformat" ],
    "owner" : {
      "account_id" : 181683,
      "reputation" : 460,
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      "profile_image" : "https://i.sstatic.net/CekZ3.jpg?s=256",
      "display_name" : "Maarten van Leunen",
      "link" : "https://stackoverflow.com/users/415848/maarten-van-leunen"
    },
    "is_answered" : false,
    "view_count" : 97,
    "closed_date" : 1764751697,
    "answer_count" : 0,
    "score" : -1,
    "last_activity_date" : 1764862110,
    "creation_date" : 1764682383,
    "last_edit_date" : 1764862110,
    "question_id" : 79835931,
    "link" : "https://stackoverflow.com/questions/79835931/messageformat-format-gives-classcast-exception",
    "closed_reason" : "Needs details or clarity",
    "title" : "MessageFormat.format() gives ClassCast exception",
    "body" : "<p>The following code snippet throws a ClassCastException.</p>\n<p>I know how to fix it, but I'm disappointed that I have to fix it at all, as the Javadoc seems to indicate this should work. But the implementation tries to cast it to an Array (without checking).</p>\n<pre><code>  @Test\n  public void testHelloWorldFormat() {\n    MessageFormat fmt = new MessageFormat(\n        &quot;Hello, {0}.&quot;);\n\n    assertThat(fmt.format(&quot;world&quot;)).isEqualTo(&quot;Hello, world.&quot;);\n  }\n</code></pre>\n<p>I have to write it according to the following, and I don't like it:</p>\n<pre><code>  @Test\n  public void testHelloWorldFormat() {\n    MessageFormat fmt = new MessageFormat(\n        &quot;Hello, {0}.&quot;);\n\n    assertThat(fmt.format(new String[] { &quot;world&quot; })).isEqualTo(&quot;Hello, world.&quot;);\n  }\n</code></pre>\n<p>Relevant link: <a href=\"https://docs.oracle.com/en/java/javase/25/docs/api//java.base/java/text/MessageFormat.html\" rel=\"nofollow noreferrer\">javadoc of <code>MessageFormat</code></a>.</p>\n<p>I found the cause of the problem:</p>\n<p>I'm calling a method from the generic superclass <strong>Format</strong></p>\n<p><code>public final String format(Object obj) </code></p>\n<p>With the generic javadoc &quot;Formats an object to produce a string..&quot;</p>\n"
  }, {
    "tags" : [ "java", "html", "selenium-webdriver", "xpath" ],
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      "display_name" : "Tony",
      "link" : "https://stackoverflow.com/users/5888946/tony"
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    "view_count" : 70,
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    "last_edit_date" : 1764681778,
    "question_id" : 79835817,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79835817/unable-to-locate-an-element-with-the-xpath-expression-spanclass-windowtitle",
    "title" : "Unable to locate an element with the xpath expression //span[@class=&#39;windowTitle&#39;]",
    "body" : "<p>OK I cannot figure out this error.  We are running an IE test (testng with selenium) (which opens Edge) on a Jenkins machine.  I keep getting this error &quot;Unable to locate an element with the xpath expression //span[@class='windowTitle']&quot; (see HTML below).  The Jenkins logfile has the source HMTL and when I inspect and do a search for &quot;//span[@class='windowTitle']&quot; it finds it fine.  When we get a Jenkins error I always download to Eclipse and run locally on my machine.  When I do that it finds the xpath with no problems.  Xpaths prior to this statement are also found.</p>\n<p>Usually with &quot;Object Errors&quot; it can be a driver/browser mismatch.  I don't have direct access to the Jenkins machine but they told me it is Edge Version 142.0.3595.53 and we just updated (to try to fis the problem which didn't work) the driver to 142.0.3595.80.</p>\n<p>HTML code is (partial)</p>\n<pre><code> &lt;span class=&quot;windowNoMargin&quot;&gt;\n   &lt;span class=&quot;windowTitle&quot;&gt;Search Facility&lt;/span&gt;\n   &lt;span class = 'buttonarea'&gt;...&lt;/span&gt;\n &lt;/span&gt;\n</code></pre>\n<p>As I say those object errors are usually a result of mismatched browser/driver but these should be compatible.</p>\n<p>The code searching for the XPATH:</p>\n<pre><code>do {\n    System.out.println(&quot;Searching for Search Input Page Header&quot;);\n} while (!timer.done() &amp;&amp; !SeleniumTools.waitForWebElementVisible(driver, By.xpath(gei.getProperty(\n                &quot;searchPage_Title&quot;)), DELAY));\n</code></pre>\n<p><code>waitForWebElementVisible()</code> does a <code>WebDriverWait</code> for the expected condition.  The property &quot;searchPage_Title&quot; is  <code>searchPage_Title=//span[@class='windowTitle']</code></p>\n<p>I am not sure what else to try.  Again to reiterate it works find when I run it locally from my machine.  My Edge is 142.0.3595.80 and Edge Driver is 142.0.3595.76.  I don't believe the IEDriverServer has changed in a long time.  I did a query for the latest version 4.14.0.0.</p>\n<p>I would like to include more HTML code but am worried about company proprietary information.</p>\n"
  }, {
    "tags" : [ "java", "servlets", "osgi", "classloader", "websphere-liberty" ],
    "owner" : {
      "account_id" : 44746813,
      "reputation" : 1,
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      "profile_image" : "https://www.gravatar.com/avatar/edbc03fa1850982f067265e6864ecfcc?s=256&d=identicon&r=PG&f=y&so-version=2",
      "display_name" : "Mohana Krishnan G",
      "link" : "https://stackoverflow.com/users/31914929/mohana-krishnan-g"
    },
    "is_answered" : false,
    "view_count" : 39,
    "answer_count" : 0,
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    "last_activity_date" : 1764672861,
    "creation_date" : 1764672861,
    "question_id" : 79835767,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79835767/application-migration-to-websphere-liberty",
    "title" : "Application migration to Websphere Liberty",
    "body" : "<p>I am migrating an application to liberty based. the application is servlet based and Jsp files based. I have created dockerfiles, helm chart and liberty config files like server.xml. my application is packed with its own set of JARs required. I am using parentLast delegation to isolate application from liberty interference.</p>\n<p>Current Error:</p>\n<p>Caused by: java.lang.LinkageError. loading constraint violation when resolving method &quot;org/eclipse/ equinox/servletbridge/BridgeServl et.registerServletDelegate(Ljavax/ servlet/http/HttpServlet;)V&quot;: loader &quot;org/eclipse/osgi/internal/baseadaptor /DefaultClassLoader@d66d27b2&quot; of class &quot;org/eclipse/equinox/http/ servletbridge/internal/Activator&quot; and loader &quot;com/ibm/ws/classloading/internal /ParentLastClassLoader@fc9bb2bd&quot; of class &quot;org/eclipse/equinox/servletbridge/ BridgeServlet&quot; have different types for the method signature.</p>\n<p>Root Cause: Liberty servlet-3.0 feature provides HttpServlet (servlet 3.1 API) to parent classloader, while embedded javax.servlet_3.0.0 bundle provides HttpServlet (servlet 3.0 API) to OSGi bundles. Same class name, DIFFERENT Class objects = LinkageError!</p>\n<p>For ERROR : I have tried 3 ways:</p>\n<p>-&gt; one is keeping servlet feature and removing servlet bundle from packing but it causes HTTPServlet and GenericServlet classes not found error.</p>\n<p>-&gt; another is keeping servlet bundle and removing servlet feature but it causes application to not start as liberty requires servlet features to deploy WARs</p>\n<p>-&gt; when i keep both of them - causes linkage error as mentioned above.</p>\n"
  }, {
    "tags" : [ "java", "android", "mqtt", "paho" ],
    "owner" : {
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      "display_name" : "ves",
      "link" : "https://stackoverflow.com/users/9089026/ves"
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    "question_id" : 79835732,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79835732/paho-android-mqtt-client-does-not-send-pingreq-to-broker-when-phone-screen-is-of",
    "title" : "paho Android MQTT client does not send PINGREQ to broker when phone screen is off",
    "body" : "<p>I have a small android app implementing a foreground service which communicates with mosquito mqtt broker, using paho MQTTClient: <strong>org.eclipse.paho:org.eclipse.paho.client.mqttv3:1.2.5</strong><br>\nEverything is fine except the case when screen is off and charging cable disconnected.<br>\nIn this case, it gets disconnected from broker because “has exceeded timeout”, which is caused by the fact that client doesn’t send any pingreq.<br>\nIf screen is on (locked or not) and no charging cable connected I can see the pingreq every keepalive interval.<br>The same when screen is off with charging cable connected.\nIt’s the same behavior on Android 9 and 14\nRegarding android settings</p>\n<ul>\n<li>on A14 I allowed the app “to use battery in the background without any restrictions” (unrestricted mode), in the app settings.</li>\n<li>on A9 its allowed background activity and no battery optimization</li>\n</ul>\n<p>The service is started in MainActivity in a standard way with</p>\n<pre><code>onCreate (Bundle savedInstanceState)\n  {\n  ...\n  startService(new Intent(this, MQTTService.class));\n  ...\n  }\n\n</code></pre>\n<p>And in MQTTService class</p>\n<pre><code>public int onStartCommand(Intent intent, int flags, int startId)\n        {\n        Intent notIntent = new Intent(this, MainActivity.class);\n        PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, notIntent, PendingIntent.FLAG_IMMUTABLE);\n        Notification not = new NotificationCompat.Builder(this, CHANNEL_ID)\n                                   .setContentTitle(&quot;MQTT listener&quot;)\n                                   .setContentText(&quot;connecting to broker...&quot;)\n                                   .setSmallIcon(R.drawable.ic_mqtt)\n                                   .setContentIntent(pendingIntent)\n                                   .setColor(getColor(R.color.white))\n                                   .setOngoing(true)\n                                   .setPriority(PRIORITY_MAX)\n                                   .build();\n        not.flags = Notification.FLAG_ONGOING_EVENT;\n        startForeground(NOT_STATE_ID, not);\n        connect2Server();\n        Log.d(TAG, &quot;onStartCommand()&quot;);\n        isRunning = true;\n        return START_STICKY;\n        }\n</code></pre>\n<p>What am I missing here? It doesnt look to be a MQTT clinet issue, but rather android power management.</p>\n<p>[Edit on dec-3]Here are some updates</p>\n<ol>\n<li>as a desperate solution I implemented a dedicated thread  which sends a dumb message to broker every keepalive interval. With this thread the client is no longer disconnected by the broker.</li>\n<li>found I missed a connection parameter: <strong>automaticReconnect</strong>\nwhich default is false. After setting it to true, I start seeing PING messages and the client was no longer disconnected. Thought I can point the culprit, but setting it back to false does not recreate the issue!?! and the client is sending now PING messages no matter automaticReconnect is true or false ….</li>\n</ol>\n<p>Not sure if automaticReconnect has any impact so I will go with the dedicated thread.</p>\n<p>[Edit on dec-5]\nSame behavior for the thread sending the dumb message.Works only if charger cable connected.\nNow i'm pretty sure this is not MQTT client issue but Android power management.\nWill raise another question removing paho mqtt client.</p>\n"
  }, {
    "tags" : [ "java", "javafx", "jar", "classloader", "graalvm" ],
    "owner" : {
      "account_id" : 25922749,
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      "display_name" : "Robert Hood",
      "link" : "https://stackoverflow.com/users/19645050/robert-hood"
    },
    "is_answered" : false,
    "view_count" : 83,
    "answer_count" : 0,
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    "last_activity_date" : 1764663733,
    "creation_date" : 1764663733,
    "question_id" : 79835635,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79835635/launching-a-jar-by-directly-loading-jar-bytes-in-memory-from-a-graal-native-imag",
    "title" : "Launching a jar by directly loading jar bytes in memory from a graal native image and launching the application no disk writes",
    "body" : "<p>I'm building an application launcher using GraalVM native image. The launcher downloads an encrypted JAR, decrypts it in memory, and needs to launch it without ever touching the disk. Security requirement - the decrypted application code should never be written anywhere. Is it possible to load the full jar?</p>\n<p>What I've tried (all failed):</p>\n<ol>\n<li><p>Direct ClassLoader approach - Doesn't work, native-image has no bytecode interpreter</p>\n</li>\n<li><p>Embedding JVM via JNI -Too complex and wasted a full day, and it never worked and i did not see or understand what was wrong and where and won't try this again due to jni unless some guides me. Technically possible, but it is a nightmare to work with it.</p>\n</li>\n<li><p>Writing temp JAR and spawning <strong><code>java -jar</code></strong> - Works perfectly BUT defeats the entire purpose (JAR is on disk, even if briefly), this is currently for testing my app.</p>\n</li>\n</ol>\n<p>I'm bundling a JRE means the launcher will download if not found on the user's machine, same as the jar from my server, so I can spawn Java processes. I just need a way to tell that JVM process, &quot;here's a JAR in memory, load it&quot; without writing files.</p>\n<p>How do enterprise apps handle this? Game launchers, IDE updaters, etc - they must have solved this problem, right?</p>\n<p>I love Java, but here I just don't like it. I can not compile it to a full native image as some libs don't support it, which I have in my jar.  Also, all methods of loading by defineClass work in ide but without jvm can not work in a native image.</p>\n<p>Any suggestions would be greatly appreciated! I really need help from you all legends.</p>\n"
  }, {
    "tags" : [ "java", "spring-boot", "ssl", "jks", "openfeign" ],
    "owner" : {
      "account_id" : 18214005,
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      "display_name" : "Miraj Hossain Shawon",
      "link" : "https://stackoverflow.com/users/13255966/miraj-hossain-shawon"
    },
    "is_answered" : false,
    "view_count" : 24,
    "answer_count" : 0,
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    "last_activity_date" : 1764703143,
    "creation_date" : 1764653378,
    "last_edit_date" : 1764703143,
    "question_id" : 79835509,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79835509/unable-to-configure-ssl-context-for-open-feign-client-getting-pkix-error",
    "title" : "Unable to configure SSL Context For Open Feign Client. Getting PKIX Error",
    "body" : "<p>I am seeking to establish a mutual TLS (mTLS) connection between two of my Spring Boot applications: a Backend service and a Web service. For that reason, I have created keystores, certificates, and truststores.</p>\n<p>Here are my commands.</p>\n<pre class=\"lang-bash prettyprint-override\"><code>keytool -genkeypair -alias backend-service -keyalg RSA -keysize 2048 -validity 3650 -keystore backend-keystore.jks -storepass changeit -keypass changeit -ext SAN=dns:localhost,ip:127.0.0.1 -dname &quot;CN=backend, OU=TK, O=AYE, L=Dhaka, C=BD&quot;\nkeytool -genkeypair -alias web-service -keyalg RSA -keysize 2048 -validity 3650 -keystore web-keystore.jks -storepass changeit -keypass changeit -ext SAN=dns:localhost,ip:127.0.0.1 -dname &quot;CN=web, OU=TK, O=AYE, L=Dhaka, C=BD&quot;\nkeytool -exportcert -alias backend-service -keystore backend-keystore.jks -file backend-service.cer -storepass changeit\nkeytool -exportcert -alias web-service -keystore web-keystore.jks -file web-service.cer -storepass changeit\nkeytool -import -alias web-service -file &quot;D:\\projects\\springProjects\\AyeTKVehicleManagement\\web-service\\src\\main\\resources\\web-service.cer&quot; -keystore backend-truststore.jks -storepass changeit -noprompt\nkeytool -import -alias backend-service -file &quot;D:\\projects\\springProjects\\AyeTKVehicleManagement\\backend-service\\src\\main\\resources\\backend-service.cer&quot; -keystore web-truststore.jks -storepass changeit -noprompt\n</code></pre>\n<p><strong>Backend Application Properties file.</strong></p>\n<pre><code>server.port=8443\nserver.servlet.context-path=/aye-backend-service\nserver.ssl.enabled=true\nserver.ssl.key-store-type=PKCS12\nserver.ssl.key-store=classpath:backend-keystore.jks\nserver.ssl.key-store-password=changeit\nserver.ssl.key-alias=backend-service\nserver.ssl.key-password=changeit\nserver.ssl.trust-store=classpath:backend-truststore.jks\nserver.ssl.trust-store-password=changeit\nserver.ssl.trust-store-type=PKCS12\nserver.ssl.client-auth=need\n</code></pre>\n<p><strong>Web Application Properties file.</strong></p>\n<pre><code>server.servlet.context-path=/aye-web-service\nserver.port=8081\nserver.ssl.enabled=true\nserver.ssl.protocol=TLS\nserver.ssl.key-store-type=PKCS12\nserver.ssl.key-store=classpath:web-keystore.jks\nserver.ssl.key-store-password=changeit\nserver.ssl.key-alias=web-service\nserver.ssl.key-password=changeit\nserver.ssl.trust-store=classpath:web-truststore.jks\nserver.ssl.trust-store-password=changeit\nserver.ssl.trust-store-type=PKCS12\nspring.cloud.openfeign.http2client.enabled=true\n</code></pre>\n<p><strong>SSL Configuration for Open Feign</strong></p>\n<pre><code>@Configuration\npublic class ApacheHttp5FeignSslClientConfig {\n\n    @Bean\n    public Feign.Builder feignBuilder(\n            @Value(&quot;${server.ssl.protocol}&quot;) String protocol,\n            @Value(&quot;${server.ssl.key-store-type}&quot;) String keyStoreType,\n            @Value(&quot;${server.ssl.key-store}&quot;) String keyStore,\n            @Value(&quot;${server.ssl.key-store-password}&quot;) String keyStorePassword,\n            @Value(&quot;${server.ssl.key-password}&quot;) String keyPassword,\n            @Value(&quot;${server.ssl.trust-store}&quot;) String trustStore,\n            @Value(&quot;${server.ssl.trust-store-password}&quot;) String trustStorePassword\n\n    ) {\n        SSLContext sslContext = getSSLContext(protocol, keyStoreType, keyStore, keyStorePassword, keyPassword, trustStore, trustStorePassword);\n        SSLConnectionSocketFactory sslConnectionSocketFactory = SSLConnectionSocketFactoryBuilder.create().setSslContext(sslContext).build();\n        HttpClientConnectionManager connectionManager = PoolingHttpClientConnectionManagerBuilder.create().setSSLSocketFactory(sslConnectionSocketFactory).build();\n        return Feign.builder()\n                .retryer(Retryer.NEVER_RETRY)\n                .client(new ApacheHttp5Client(HttpClients.custom()\n                        .setConnectionManager(connectionManager)\n                        .build()));\n    }\n\n    private SSLContext getSSLContext(String protocol, String keyStoreType,\n                                     String keyStore, String keyStorePassword, String keyPassword,\n                                     String trustStore, String trustStorePassword) {\n        try {\n            // Load key store\n            KeyStore keyStoreObj = KeyStore.getInstance(keyStoreType);\n            try (FileInputStream keyStoreStream = new FileInputStream(ResourceUtils.getFile(keyStore))) {\n                keyStoreObj.load(keyStoreStream, keyStorePassword.toCharArray());\n            }\n\n            // Load trust store\n            KeyStore trustStoreObj = KeyStore.getInstance(keyStoreType);\n            try (FileInputStream trustStoreStream = new FileInputStream(ResourceUtils.getFile(trustStore))) {\n                trustStoreObj.load(trustStoreStream, trustStorePassword.toCharArray());\n            }\n\n            // Create key manager factory\n            KeyManagerFactory keyManagerFactory = KeyManagerFactory.getInstance(\n                    KeyManagerFactory.getDefaultAlgorithm());\n            keyManagerFactory.init(keyStoreObj, keyPassword.toCharArray());\n\n            // Create trust manager factory\n            TrustManagerFactory trustManagerFactory = TrustManagerFactory.getInstance(\n                    TrustManagerFactory.getDefaultAlgorithm());\n            trustManagerFactory.init(trustStoreObj);\n\n            // Create SSL context\n            SSLContext sslContext = SSLContext.getInstance(protocol);\n            sslContext.init(keyManagerFactory.getKeyManagers(),\n                    trustManagerFactory.getTrustManagers(), new SecureRandom());\n\n            return sslContext;\n\n        } catch (Exception e) {\n            log.error(&quot;Error while building SSLContext for ApacheHttp5FeignSslClient&quot;, e);\n            throw new RuntimeException(&quot;Error while building SSLContext&quot;, e);\n        }\n    }\n\n\n}\n</code></pre>\n<p><strong>Feign Client</strong></p>\n<pre><code>@FeignClient(name = &quot;StepServiceFeignClient&quot;,\n        url = &quot;${backend.service.url}${backend.service.steps.prefix}&quot;,\n        configuration = ApacheHttp5FeignSslClientConfig.class)\npublic interface StepServiceFeignClient {}\n</code></pre>\n<p>When trying to call backend api from web service using open feign client it is throwing error i am unable understand the point of failure.</p>\n<p>threw exception</p>\n<pre class=\"lang-none prettyprint-override\"><code>[Request processing failed: feign.RetryableException: PKIX path building failed:\n  sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target executing GET https://localhost:8443/aye-backend-service/api/steps?size=20&amp;page=0] with root cause\n  sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target\n</code></pre>\n"
  }, {
    "tags" : [ "java", "memory", "memory-leaks", "pmap", "nmt" ],
    "owner" : {
      "account_id" : 9972847,
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      "display_name" : "walker_fish",
      "link" : "https://stackoverflow.com/users/7378390/walker-fish"
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    "last_activity_date" : 1764726643,
    "creation_date" : 1764644612,
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    "question_id" : 79835446,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79835446/why-large-string-log-data-cause-the-java-progress-memory-high",
    "title" : "Why large string log data cause the java progress memory high?",
    "body" : "<h1>problem--why the large string log data cause the jvm memory go high?</h1>\n<p><a href=\"https://i.sstatic.net/Z44baqqm.png\" rel=\"nofollow noreferrer\"><img src=\"https://i.sstatic.net/Z44baqqm.png\" alt=\"memory problem\" /></a></p>\n<p><a href=\"https://i.sstatic.net/YFLvsBSx.png\" rel=\"nofollow noreferrer\"><img src=\"https://i.sstatic.net/YFLvsBSx.png\" alt=\"top res\" /></a></p>\n<ul>\n<li>problem: the java process is using more and more memory over time.</li>\n<li>jvm argument:java -Xmx5120M -Xms5120M -XX:NewRatio=1 -XX:MetaspaceSize=512m -XX:MaxMetaspaceSize=512m -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/data/log -XX:+PrintCommandLineFlags -XX:+PrintGCDetails -XX:+PrintGCDateStamps -XX:+PrintGCTimeStamps -Xloggc:/data/log/gc-%t.log -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=5 -XX:GCLogFileSize=20m -XX:ErrorFile=/data/log/hs_err_%p.log -XX:+UseConcMarkSweepGC -XX:CMSInitiatingOccupancyFraction=80 -XX:+UseCMSInitiatingOccupancyOnly -XX:AutoBoxCacheMax=20000 -XX:-UseBiasedLocking -XX:NativeMemoryTracking=detail -jar /data/app/app-live-admin-service/app_live_admin_services.jar</li>\n<li>jdkversion:openjdk version &quot;1.8.0_412&quot;</li>\n<li>the docker memory is 8GB</li>\n</ul>\n<h2>jcmd GC heap info:</h2>\n<pre class=\"lang-none prettyprint-override\"><code>root@app-live-admin-service-prod-gzhy-idc-1283210-ml75f:~# jcmd 115 GC.heap_info\n115:\n par new generation   total 2359296K, used 406730K [0x00000006a0800000, 0x0000000740800000, 0x0000000740800000)\n  eden space 2097152K,  18% used [0x00000006a0800000, 0x00000006b8266b70, 0x0000000720800000)\n  from space 262144K,   7% used [0x0000000730800000, 0x0000000731acbd30, 0x0000000740800000)\n  to   space 262144K,   0% used [0x0000000720800000, 0x0000000720800000, 0x0000000730800000)\n concurrent mark-sweep generation total 2621440K, used 362690K [0x0000000740800000, 0x00000007e0800000, 0x00000007e0800000)\n Metaspace       used 180048K, capacity 196318K, committed 196608K, reserved 1224704K\n  class space    used 19486K, capacity 22194K, committed 22272K, reserved 1048576K\n</code></pre>\n<h2>heap_info</h2>\n<pre class=\"lang-none prettyprint-override\"><code>Attaching to process ID 115, please wait...\nDebugger attached successfully.\nServer compiler detected.\nJVM version is 25.412-b08\n\nusing parallel threads in the new generation.\nusing thread-local object allocation.\nConcurrent Mark-Sweep GC\n\nHeap Configuration:\n   MinHeapFreeRatio         = 40\n   MaxHeapFreeRatio         = 70\n   MaxHeapSize              = 5368709120 (5120.0MB)\n   NewSize                  = 2684354560 (2560.0MB)\n   MaxNewSize               = 2684354560 (2560.0MB)\n   OldSize                  = 2684354560 (2560.0MB)\n   NewRatio                 = 1\n   SurvivorRatio            = 8\n   MetaspaceSize            = 536870912 (512.0MB)\n   CompressedClassSpaceSize = 528482304 (504.0MB)\n   MaxMetaspaceSize         = 536870912 (512.0MB)\n   G1HeapRegionSize         = 0 (0.0MB)\n\nHeap Usage:\nNew Generation (Eden + 1 Survivor Space):\n   capacity = 2415919104 (2304.0MB)\n   used     = 53123984 (50.66297912597656MB)\n   free     = 2362795120 (2253.3370208740234MB)\n   2.1989140245649548% used\nEden Space:\n   capacity = 2147483648 (2048.0MB)\n   used     = 31850616 (30.37511444091797MB)\n   free     = 2115633032 (2017.624885559082MB)\n   1.4831598848104477% used\nFrom Space:\n   capacity = 268435456 (256.0MB)\n   used     = 21273368 (20.287864685058594MB)\n   free     = 247162088 (235.7121353149414MB)\n   7.924947142601013% used\nTo Space:\n   capacity = 268435456 (256.0MB)\n   used     = 0 (0.0MB)\n   free     = 268435456 (256.0MB)\n   0.0% used\nconcurrent mark-sweep generation:\n   capacity = 2684354560 (2560.0MB)\n   used     = 395406008 (377.0885543823242MB)\n   free     = 2288948552 (2182.911445617676MB)\n   14.73002165555954% used\n\n85820 interned Strings occupying 9118248 bytes.\n\n</code></pre>\n<h2>nmt info</h2>\n<p><a href=\"https://github.com/walkertest/JavaStudy/blob/master/doc/problemdoc/AMemoryHighProblem/nmt.txt\" rel=\"nofollow noreferrer\">detail see</a></p>\n<ul>\n<li>jcmd pid VM.native_memory detail scale=MB &gt; nmt.txt</li>\n</ul>\n<pre class=\"lang-none prettyprint-override\"><code>Native Memory Tracking:\n\nTotal: reserved=7532MB, committed=6442MB\n-                 Java Heap (reserved=5120MB, committed=5120MB)\n                            (mmap: reserved=5120MB, committed=5120MB) \n \n-                     Class (reserved=1202MB, committed=198MB)\n                            (classes #29966)\n                            (malloc=6MB #91853) \n                            (mmap: reserved=1196MB, committed=192MB) \n \n-                    Thread (reserved=632MB, committed=632MB)\n                            (thread #629)\n                            (stack: reserved=630MB, committed=630MB)\n                            (malloc=1MB #3768) \n                            (arena=1MB #1253)\n \n-                      Code (reserved=277MB, committed=191MB)\n                            (malloc=34MB #42103) \n                            (mmap: reserved=244MB, committed=158MB) \n \n-                        GC (reserved=31MB, committed=31MB)\n                            (malloc=16MB #2974) \n                            (mmap: reserved=15MB, committed=15MB) \n \n-                  Compiler (reserved=2MB, committed=2MB)\n                            (malloc=2MB #4636) \n \n-                  Internal (reserved=155MB, committed=155MB)\n                            (malloc=155MB #52511) \n \n-                    Symbol (reserved=31MB, committed=31MB)\n                            (malloc=27MB #309643) \n                            (arena=4MB #1)\n \n-    Native Memory Tracking (reserved=9MB, committed=9MB)\n                            (malloc=1MB #9371) \n                            (tracking overhead=8MB)\n \n-                   Unknown (reserved=73MB, committed=73MB)\n                            (mmap: reserved=73MB, committed=73MB) \n \nVirtual memory map:\n</code></pre>\n<h2>jmap detail data</h2>\n<p><a href=\"https://i.sstatic.net/2f30gJQM.png\" rel=\"nofollow noreferrer\"><img src=\"https://i.sstatic.net/2f30gJQM.png\" alt=\"jmap mat\" /></a></p>\n<h2>pmap info</h2>\n<pre class=\"lang-none prettyprint-override\"><code>pmap info：pmap -x pid &gt; pmap1.txt\npmap info sort :sort -n -k 3 -r pmap1.txt -o pmap2.txt\nsee the addressinfo :tail -c +$((0x00007f8eec000000+1)) /proc/${pid}/mem|head -c $((11616*1024))|strings &gt; data10.txt\n</code></pre>\n<p><a href=\"https://github.com/walkertest/JavaStudy/blob/master/doc/problemdoc/AMemoryHighProblem/pmap1.txt\" rel=\"nofollow noreferrer\">pmap1.txt</a>\n<a href=\"https://github.com/walkertest/JavaStudy/blob/master/doc/problemdoc/AMemoryHighProblem/pmap2.txt\" rel=\"nofollow noreferrer\">pmap2.txt</a>\n<a href=\"https://raw.githubusercontent.com/walkertest/JavaStudy/refs/heads/master/doc/problemdoc/AMemoryHighProblem/data10.txt\" rel=\"nofollow noreferrer\">data10.txt</a></p>\n<p><a href=\"https://i.sstatic.net/JYJkE52C.png\" rel=\"nofollow noreferrer\"><img src=\"https://i.sstatic.net/JYJkE52C.png\" alt=\"enter image description here\" /></a></p>\n<p><a href=\"https://i.sstatic.net/TMOXbTaJ.png\" rel=\"nofollow noreferrer\"><img src=\"https://i.sstatic.net/TMOXbTaJ.png\" alt=\"enter image description here\" /></a></p>\n<ul>\n<li>there are many memory info has be releated to the large string log data(The log may be serval days before). So i do a version that not log large string data then the memory is normal.</li>\n<li>I want to know why the large string log data will cause the jvm memory go high? And which area the memory go high(the log address is not in the nmt info)?</li>\n<li>The large string log data means that the log line has 20KB or more bigger. The code is like below picture.\n<a href=\"https://i.sstatic.net/f9bTec6t.png\" rel=\"nofollow noreferrer\"><img src=\"https://i.sstatic.net/f9bTec6t.png\" alt=\"enter image description here\" /></a></li>\n</ul>\n"
  }, {
    "tags" : [ "java", "architecture", "transactions", "soa" ],
    "owner" : {
      "account_id" : 12883424,
      "reputation" : 337,
      "user_id" : 16492630,
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      "profile_image" : "https://www.gravatar.com/avatar/6d9b4d29d992db6b2980892e9ba504cf?s=256&d=identicon&r=PG&f=y&so-version=2",
      "display_name" : "RogueGingerz",
      "link" : "https://stackoverflow.com/users/16492630/roguegingerz"
    },
    "is_answered" : false,
    "view_count" : 36,
    "answer_count" : 0,
    "score" : 1,
    "last_activity_date" : 1764644543,
    "creation_date" : 1764644543,
    "question_id" : 79835445,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79835445/data-ownership-and-transaction-managment-in-soa",
    "title" : "Data Ownership and Transaction Managment in SOA",
    "body" : "<p>I'm trying to learn more about Service Oriented Architecture as to me, it seems like a good middle ground between monolithic and micro service applications. Please correct me if I'm wrong but the primary goal is to segment domains (business logic) into separated independent services that are still wrapped by an overarching build orchestrator.</p>\n<p>From my perspective, even though the domains are separated and independent, that doesn't necessarily mean that each domain should control an independent persistent layer, instead they should share a persistent layer to share referential integrity and maintain easy querying.</p>\n<p><em><strong>This leads me to my primary questions</strong></em>:</p>\n<ul>\n<li>If there are multiple independent services that are all making transactions to the db, how do you ensure that if there is a failure in a downstream process, how do you properly manage the rollback of the previous transactions? Do you just literally chain try catches from the start all the way to the end to ensure that the lowest process is successful? In both these two other posts, people point out 2 phase commit protocol. Is this still used/relevant (I ask because the posts are rather old)?</li>\n</ul>\n<p><a href=\"https://stackoverflow.com/questions/18662025/in-service-oriented-architecture-soa-should-each-service-own-its-own-data\">Data Management in SOA</a></p>\n<p><a href=\"https://stackoverflow.com/questions/10187360/transaction-management-in-soa\">Transaction Management in SOA</a></p>\n"
  }, {
    "tags" : [ "java", "spring", "spring-boot", "gradle", "build.gradle" ],
    "owner" : {
      "account_id" : 12883424,
      "reputation" : 337,
      "user_id" : 16492630,
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      "profile_image" : "https://www.gravatar.com/avatar/6d9b4d29d992db6b2980892e9ba504cf?s=256&d=identicon&r=PG&f=y&so-version=2",
      "display_name" : "RogueGingerz",
      "link" : "https://stackoverflow.com/users/16492630/roguegingerz"
    },
    "is_answered" : true,
    "view_count" : 75,
    "accepted_answer_id" : 79835464,
    "answer_count" : 1,
    "score" : 4,
    "last_activity_date" : 1764647076,
    "creation_date" : 1764642427,
    "question_id" : 79835427,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79835427/multi-gradle-with-spring-boot-config-question",
    "title" : "Multi-Gradle with Spring Boot Config Question",
    "body" : "<p>I'm looking for an explanation to why do I need to have a <code>build.gradle</code> in my service directory to stop the root build.gradle from treating it like a buildable project:</p>\n<p>My Directory:</p>\n<pre><code>root:\n|-&gt; services\n   |-&gt; gateway\n      |-&gt; (under the normal folder structure) GatewayApplication.java (Where my @SpringBootApplication is)\n      |-&gt; build.gradle\n   |-&gt; userService\n      |-&gt; UserServiceApplication.java (Where my @SpringBootApplication is)\n      |-&gt; build.gradle\n   |-&gt; build.gradle (the gradle file in question)\n|-&gt; (root's) build.gradle\n|-&gt; settings.gradle\n</code></pre>\n<p>My <code>setting.gradle</code></p>\n<pre><code>rootProject.name = 'black-creek'\n// I thought that these would dictate that it where these directories, gateway and userService where the only buildable gradle projects\ninclude 'services:gateway'\ninclude 'services:userService'\n</code></pre>\n<p>root <code>build.gradle</code>:</p>\n<pre><code>plugins {\n    id 'java'\n    id 'org.springframework.boot' version '4.0.0' apply false\n    id 'io.spring.dependency-management' version '1.1.7' apply false\n}\n\nallprojects {\n    group = 'ciallsoftware'\n    version = '0.0.1-SNAPSHOT'\n}\n\nsubprojects {\n    apply plugin: 'java'\n    apply plugin: 'org.springframework.boot'\n    apply plugin: 'io.spring.dependency-management'\n\n    java {\n        toolchain {\n            languageVersion = JavaLanguageVersion.of(21)\n        }\n    }\n\n    repositories {\n        mavenCentral()\n    }\n\n    dependencies {\n        developmentOnly 'org.springframework.boot:spring-boot-devtools'\n        testImplementation 'org.springframework.boot:spring-boot-starter-test'\n        testRuntimeOnly 'org.junit.platform:junit-platform-launcher'\n    }\n\n    tasks.named('test') {\n        useJUnitPlatform()\n    }\n}\n</code></pre>\n<p>Each of the service's projects have their own <code>build.gradle</code> for their specific dependencies. So I won't post those.</p>\n<p>If I didn't include the <code>build.gradle</code> at the root of the service directory I'd continuously receive the following error:</p>\n<pre><code>./gradlew bR\n&gt; Task :services:bootRun FAILED\n\nFAILURE: Build failed with an exception.\n\n* What went wrong:\nExecution failed for task ':services:bootRun'.\n&gt; Failed to query the value of task ':services:bootRun' property 'mainClass'.\n   &gt; Main class name has not been configured and it could not be resolved from classpath \n</code></pre>\n<p>But I had discovered that the build.gradle was treating my service directory as a buildable project, even though I thought in the settings.gradle I dictated it was the subdirectories, i.e <code>services:gateway</code>, not the service directory. I had to include in the build.gradle in question:</p>\n<pre><code>bootJar {\n    enabled = false\n}\nbootRun {\n    enabled = false\n}\njar {\n    enabled = false\n}\n</code></pre>\n<p>I guess I just don't understand why it would treat my service directory as a buildable project, and why I would have to include what was printed just above this to prevent it.\nAny explanation / insight would be helpful.</p>\n"
  }, {
    "tags" : [ "java", "javafx", "canvas", "snapshot" ],
    "owner" : {
      "account_id" : 12506291,
      "reputation" : 811,
      "user_id" : 9103039,
      "user_type" : "registered",
      "profile_image" : "https://i.sstatic.net/TqlDK.jpg?s=256",
      "display_name" : "Starnec",
      "link" : "https://stackoverflow.com/users/9103039/starnec"
    },
    "is_answered" : true,
    "view_count" : 79,
    "accepted_answer_id" : 79835979,
    "answer_count" : 1,
    "score" : 1,
    "last_activity_date" : 1764769905,
    "creation_date" : 1764634042,
    "question_id" : 79835369,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79835369/using-fitwidth-and-fitheight-results-in-a-snapshot-with-a-smaller-rendered-image",
    "title" : "Using FitWidth and FitHeight results in a snapshot with a smaller rendered image than expected",
    "body" : "<h2>Intro</h2>\n<p>The following code implements a <code>draw-by-brush</code> on an image using a canvas. The Idea is to stack a <a href=\"https://openjfx.io/javadoc/25/javafx.graphics/javafx/scene/canvas/Canvas.html\" rel=\"nofollow noreferrer\">Canvas</a> object over an <a href=\"https://openjfx.io/javadoc/25/javafx.graphics/javafx/scene/image/ImageView.html\" rel=\"nofollow noreferrer\">ImageView</a>, draw on it, and finally render the <a href=\"https://openjfx.io/javadoc/25/javafx.graphics/javafx/scene/layout/StackPane.html\" rel=\"nofollow noreferrer\">StackPane</a> (image + canvas) using the <a href=\"https://openjfx.io/javadoc/25/javafx.graphics/javafx/scene/SnapshotParameters.html\" rel=\"nofollow noreferrer\">SnapshotParameters</a> and <a href=\"https://openjfx.io/javadoc/25/javafx.graphics/javafx/scene/image/WritableImage.html\" rel=\"nofollow noreferrer\">WritableImage</a>.</p>\n<h2>Code</h2>\n<p>The <code>saveSnapshot(StackPane stack, int width, int height)</code> method simply creates a <code>WritableImage</code> with the specified width and height (matching the original image's dimensions), and takes a <code>snapshot</code> of the <code>StackPane</code> on it.</p>\n<p>This is the full code:</p>\n<pre><code>import javafx.application.Application;\nimport javafx.beans.binding.Bindings;\nimport javafx.beans.binding.DoubleBinding;\nimport javafx.embed.swing.SwingFXUtils;\nimport javafx.geometry.Pos;\nimport javafx.scene.Scene;\nimport javafx.scene.SnapshotParameters;\nimport javafx.scene.canvas.Canvas;\nimport javafx.scene.canvas.GraphicsContext;\nimport javafx.scene.control.Button;\nimport javafx.scene.image.Image;\nimport javafx.scene.image.ImageView;\nimport javafx.scene.image.WritableImage;\nimport javafx.scene.input.MouseButton;\nimport javafx.scene.layout.StackPane;\nimport javafx.scene.layout.VBox;\nimport javafx.scene.paint.Color;\nimport javafx.stage.Stage;\n\nimport javax.imageio.ImageIO;\nimport java.awt.image.BufferedImage;\nimport java.io.File;\nimport java.io.IOException;\nimport java.util.Objects;\n\npublic class DrawOverImageCanvas extends Application {\n    private double lastX;\n    private double lastY;\n\n    @Override\n    public void start(Stage stage) {\n        Image image = new Image(Objects.requireNonNull(getClass().getResourceAsStream(&quot;yourPath&quot;)));\n        int height = (int) image.getHeight();\n        int width = (int) image.getWidth();\n\n        System.out.println(&quot;width: &quot; + width + &quot; height: &quot; + height);\n\n        if (image.isError())\n            System.err.println(&quot;Could not load image: &quot; + image.getException());\n\n        ImageView imageView = new ImageView(image);\n        imageView.setPreserveRatio(true);\n        imageView.setSmooth(true);\n        imageView.setFitWidth(500);\n\n        Canvas canvas = new Canvas();\n        GraphicsContext gc = canvas.getGraphicsContext2D();\n        gc.setLineWidth(3);\n        gc.setStroke(Color.RED);\n\n        canvas.setOnMousePressed(e -&gt; {\n            if (e.getButton() == MouseButton.PRIMARY) {\n                lastX = e.getX();\n                lastY = e.getY();\n            }\n        });\n\n        canvas.setOnMouseDragged(e -&gt; {\n            if (e.getButton() == MouseButton.PRIMARY) {\n                double x = e.getX();\n                double y = e.getY();\n                gc.strokeLine(lastX, lastY, x, y);\n                lastX = x;\n                lastY = y;\n            }\n        });\n\n        StackPane stack = new StackPane(imageView, canvas);\n        stack.setAlignment(Pos.CENTER);\n        stack.setStyle(&quot;-fx-background-color: transparent;&quot;);\n\n        DoubleBinding imageWidth = Bindings.createDoubleBinding(\n                () -&gt; imageView.getLayoutBounds().getWidth(),\n                imageView.layoutBoundsProperty()\n        );\n\n        DoubleBinding imageHeight = Bindings.createDoubleBinding(\n                () -&gt; imageView.getLayoutBounds().getHeight(),\n                imageView.layoutBoundsProperty()\n        );\n\n        stack.minWidthProperty().bind(imageWidth);\n        stack.prefWidthProperty().bind(imageWidth);\n        stack.maxWidthProperty().bind(imageWidth);\n\n        stack.minHeightProperty().bind(imageHeight);\n        stack.prefHeightProperty().bind(imageHeight);\n        stack.maxHeightProperty().bind(imageHeight);\n\n        canvas.widthProperty().bind(imageWidth);\n        canvas.heightProperty().bind(imageHeight);\n\n        Button saveButton = new Button(&quot;Save PNG&quot;);\n        saveButton.setOnAction(e -&gt; saveSnapshot(stack, width, height));\n\n        Button clearButton = new Button(&quot;Clear Drawing&quot;);\n        clearButton.setOnAction(e -&gt; {\n            gc.clearRect(0, 0, canvas.getWidth(), canvas.getHeight());\n        });\n\n        VBox root = new VBox(10, stack, new VBox(5, saveButton, clearButton));\n        root.setAlignment(Pos.CENTER);\n        root.setStyle(&quot;-fx-padding: 10; -fx-background-color: #333333;&quot;);\n\n        Scene scene = new Scene(root);\n        stage.setTitle(&quot;Draw over Image with Canvas&quot;);\n        stage.setScene(scene);\n        stage.sizeToScene();\n        stage.show();\n    }\n\n    private void saveSnapshot(StackPane stack, int width, int height) {\n        SnapshotParameters params = new SnapshotParameters();\n        params.setFill(Color.TRANSPARENT);\n\n        WritableImage writableImage = new WritableImage(width, height);\n        stack.snapshot(params, writableImage);\n\n        BufferedImage bufferedImage = SwingFXUtils.fromFXImage(writableImage, null);\n        File outFile = new File(&quot;500.png&quot;);\n\n        try {\n            ImageIO.write(bufferedImage, &quot;png&quot;, outFile);\n            System.out.println(&quot;Saved to: &quot; + outFile.getAbsolutePath());\n        } catch (IOException ex) {\n            ex.printStackTrace();\n        }\n    }\n}\n</code></pre>\n<h2>Issue</h2>\n<p>The issue is that when the image's <code>FitWidth</code> and <code>FitHeight</code> are set to values smaller than their actual width and height, the snapshot captures the entire <code>StackPane</code>, using the <code>FitWidth</code> and <code>FitHeight</code> values rather than the image's actual width and height, since the <code>StackPane</code> size is bound to the <code>ImageView</code>'s.</p>\n<p>The resulting snapshot image will keep its original size (since the <code>WritableImage</code> size matches the image's), but with a <code>StackPane</code> rendered inside it because <code>FitWidth</code> and <code>FitHeight</code> were smaller than the image's actual height and width.</p>\n<p>The screenshot below is from my PC's file explorer, showing different results generated by using various Fit Width values from 200 to 500, compared to the original image at its actual size. All the images have the same dimensions, but the rendered ones <code>StackPane</code> varies depending on the value used for the <code>setFitWidth</code>.</p>\n<p><img src=\"https://i.sstatic.net/F0ZH4c9V.png\" alt=\"enter image description here\" /></p>\n<p>Is there a way for the rendered StackPane to occupy the full height and width as the original image?</p>\n"
  }, {
    "tags" : [ "java", "javafx", "point-of-sale", "network-printers" ],
    "owner" : {
      "account_id" : 17216137,
      "reputation" : 31,
      "user_id" : 16906770,
      "user_type" : "registered",
      "profile_image" : "https://lh3.googleusercontent.com/a-/AOh14GgOH3WFftUyR1aByIB3WVxfGvPxGUZKqYPkQ8ES=k-s256",
      "display_name" : "Armin Brkić",
      "link" : "https://stackoverflow.com/users/16906770/armin-brki%c4%87"
    },
    "is_answered" : false,
    "view_count" : 64,
    "answer_count" : 0,
    "score" : 0,
    "last_activity_date" : 1764655974,
    "creation_date" : 1764620132,
    "last_edit_date" : 1764655974,
    "question_id" : 79835251,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79835251/how-to-check-the-online-offline-status-of-a-pos-printer-in-java",
    "title" : "How to check the online/offline status of a POS Printer in Java?",
    "body" : "<p>I am developing a Java application that prints receipts to a DGT POS Printer Speed Line 300-UL. The printer is connected via Ethernet (network), not USB.</p>\n<p>I want to implement a feature where the application checks if the printer is online before sending a print job, so that if the printer is offline, the user (cashier) receives a warning and the order is not lost.</p>\n<p>Currently, I am using <code>PrintServiceLookup.lookupPrintServices()</code> in Java to get the printer by name, but I cannot reliably determine if the printer is online. The printer’s name is detected correctly, but there is no status information.</p>\n<p>I have considered:</p>\n<ul>\n<li>Using WMIC or querying the Windows printer port → doesn’t work reliably for this printer.</li>\n<li>Sending a small test print to check if the printer is reachable → works, but I wonder if there is a cleaner way.</li>\n</ul>\n<p>My questions:</p>\n<ul>\n<li>Is there a way in Java to check the online/offline status of a network POS printer by name?</li>\n<li>Is there a method to reliably get the printer IP from Java if only the printer name is known?</li>\n<li>Are there any best practices for POS Ethernet printers to verify connectivity before printing?</li>\n</ul>\n<p>I am specifically targeting DGT POS Printer Speed Line 300-UL, but general solutions for Ethernet POS printers in Java are also welcome.</p>\n<p>Thanks in advance!</p>\n<p>My print function</p>\n<pre><code>public static void printToPOSInvoice(ObservableList&lt;PrinterRules&gt; printRules, long orderHeader_id, Preferences preferences) {\n    System.out.println(&quot;Print to pos&quot;);\n\n    //  Checking if POS printing is enabled at all\n    if (!preferences.getBoolean(Functions.POSSTATUS, false)) {\n        return; // Exit if POS is disabled\n    }\n\n    try {\n        OrderHeader aos = OrderHeaderService.orderHeaderService.getById(orderHeader_id);\n        Table tempTable = TablesServices.tablesServices.getById(aos.getTable_id());\n        if (tempTable == null) {\n            tempTable = new Table(0, &quot;&quot;, 0, &quot;&quot;, 1, &quot;&quot;);\n        }\n        final Table table = tempTable;\n\n        Map&lt;String, List&lt;CartItem&gt;&gt; groupsToPrint =\n                PrintGroupService.groupItemsByPrinter(printRules, CartFunctions.cartList);\n\n        // WE START WITH THE ITERATION FOR PRINTING\n        groupsToPrint.forEach((printerName, items) -&gt; {\n\n            try {\n                // 1. CHECKING THE EXISTENCE OF A PRINTER\n                PrintService service = PrintRulesService.getPrintServiceByName(printerName);\n                if (service == null) {\n                    throw new RuntimeException(\n                            &quot;Printer '&quot; + printerName + &quot;' is not found. Check name or driver.&quot;\n                    );\n                }\n                System.out.println(&quot;Printer is found: &quot; + printerName);\n\n                // --- Text and data generation  ---\n                String text = PrintRulesService.printRulesService.generatePrintTextInvoice(aos, items);\n\n                byte[] data = PrintRulesService.concat(\n                        PrintRulesService.INIT,\n                        PrintRulesService.ALIGN_CENTER,\n                        PrintRulesService.LARGE_ON,\n                        PrintRulesService.BOLD_ON,\n                        PrintRulesService.text(&quot;==== NARUDZBA ====\\n&quot;),\n                        // ... other data (abbreviated for clarity) ...\n                        PrintRulesService.text(text),\n                        PrintRulesService.LF, PrintRulesService.LF,\n                        PrintRulesService.ALIGN_CENTER,\n                        QRGenerator.generateQRForOrder(aos, null),\n                        PrintRulesService.LF, PrintRulesService.LF,\n                        PrintRulesService.ALIGN_CENTER,\n                        PrintRulesService.text(&quot;==== Hvala! ====\\n&quot;),\n                        PrintRulesService.LF, PrintRulesService.LF,\n                        PrintRulesService.LF, PrintRulesService.LF,\n                        PrintRulesService.LF,\n                        PrintRulesService.CUT\n                );\n                // ----------------------------------------------------\n                // 3) Sending bytes to POS printer\n                PrintRulesService.printBytes(printerName, data);\n\n            } catch (RuntimeException re) {\n                // Catches errors when searching for printers\n                Dialogs.showOKDialog(\n                        PrintRulesService.class,\n                        &quot;Preparation Error&quot;,\n                        &quot;An error occurred while preparing the print job for '&quot; + printerName + &quot;':\\n&quot; + re.getMessage()\n\n                );\n            } catch (Exception e) {\n                // Catches all I/O and PrintService errors from PrintRulesService.printBytes(printerName, data)\n                Dialogs.showOKDialog(\n                        PrintRulesService.class,\n                        &quot;Error from POS printer: &quot; + printerName,\n                        &quot;**Printer is OFFLINE or unavailable!**\\n\\n An error occurred while printing to '&quot; + printerName + &quot;':\\n&quot; + e.getMessage()                    );\n            }\n        }); //\n\n    } catch (Exception e) {\n        // Catch errors outside the loop (e.g., retrieving OrderHeader or TablesServices)\n\n        Dialogs.showOKDialog(\n                PrintRulesService.class,\n                &quot;General System Error&quot;,\n                &quot;A general error occurred before printing.:\\n&quot; + e.getMessage()\n        );\n    }\n}\n</code></pre>\n<p>And printBytes function:</p>\n<pre><code>public static void printBytes(String printerName, byte[] bytes) {\n    try {\n        // 1. Get a printer\n        PrintService service = getPrintServiceByName(printerName);\n\n        // \uD83D\uDD34Printer does not exist → throw an error !!!\n        if (service == null) {\n            System.out.println(&quot;Printer '&quot; + printerName + &quot;' not found or not ON.&quot;);\n            throw new RuntimeException(&quot;Printer '&quot; + printerName + &quot;' not found or not ON.&quot;);\n        }\n\n        // 2. Preparing for printing\n        DocPrintJob job = service.createPrintJob();\n        DocFlavor flavor = DocFlavor.BYTE_ARRAY.AUTOSENSE;\n        Doc doc = new SimpleDoc(bytes, flavor, null);\n\n        // 3. try print\n        job.print(doc, null);\n\n    } catch (Exception e) {\n        System.out.println(e.getMessage());\n        // \uD83D\uDD34 Any error goes further to printToPOSInvoice\n        throw new RuntimeException(&quot;Error sending data to POS printer: &quot; + e.getMessage(), e);\n    }\n}\n</code></pre>\n"
  }, {
    "tags" : [ "java", "android" ],
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      "display_name" : "redoc01",
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    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79835242/android-java-ui-does-not-load-intermittently",
    "title" : "Android Java - UI does not load intermittently",
    "body" : "<p>Im developing a app in Android using Java.</p>\n<p>When i run the app in android studio the UI does not load completely, i can see the bottom navigation and toolbar but the fragments do not load 90% of the time when i run the app in Android Studio.</p>\n<p>This is the main layout when the app loads:</p>\n<pre><code>    package com.balu.datez;\n    import com.google.gson.Gson;\n    import com.microsoft.signalr.HubConnection;\n    import com.microsoft.signalr.HubConnectionBuilder;\n    \n    import android.content.Intent;\n    import android.content.SharedPreferences;\n    import android.os.Bundle;\n    import androidx.activity.OnBackPressedCallback;\n    import androidx.annotation.NonNull;\n    import androidx.appcompat.app.ActionBarDrawerToggle;\n    import androidx.appcompat.app.AppCompatActivity;\n    import androidx.core.view.GravityCompat;\n    import androidx.drawerlayout.widget.DrawerLayout;\n    \n    import android.os.Handler;\n    import android.os.Looper;\n    import android.view.MenuItem;\n    import android.widget.Toast;\n    import androidx.appcompat.widget.Toolbar;\n    \n    import com.google.android.material.bottomnavigation.BottomNavigationView;\n    import com.google.android.material.navigation.NavigationView;\n    import com.microsoft.signalr.HubConnectionState;\n    \n    import androidx.activity.EdgeToEdge;\n    import androidx.fragment.app.Fragment;\n    import androidx.fragment.app.FragmentManager;\n    import androidx.fragment.app.FragmentTransaction;\n    \n    import java.util.concurrent.ExecutorService;\n    import java.util.concurrent.Executors;\n    \n    \n    public class MainLayoutActivity extends AppCompatActivity {\n    \n        SignalRConnectionsMainHelper signalConnectionsMainHelper;\n        SignalRFollowsMainHelper signalRFollowsMainHelper;\n        private DrawerLayout drawerLayout;\n        private NavigationView navigationView;\n        private Toolbar toolbar;\n        Fragment homeFragment;\n        InteractionsFragment interactionFragment;\n        Fragment highlightsFragment;\n        Fragment searchFragment;\n        FragmentTransaction transaction;\n        @Override\n        protected void onCreate(Bundle savedInstanceState) {\n            super.onCreate(savedInstanceState);\n            EdgeToEdge.enable(this);\n            setContentView(R.layout.activity_main_layout);\n    \n            HttpsHelper.trustAllCertificates();\n    \n            SharedPreferences settingsLoginData = getApplicationContext().getSharedPreferences(&quot;LoginData&quot;, 0);\n            String userGuidSP = settingsLoginData.getString(&quot;userGuid&quot;, &quot;&quot;);\n    \n            drawerLayout = findViewById(R.id.drawer_layout);\n            toolbar = findViewById(R.id.toolbar);\n            navigationView = findViewById(R.id.nav_view);\n    \n            Intent intent = getIntent();\n            if(intent.getBooleanExtra(&quot;newProfileAdded&quot;, false)){\n    \n            }\n    \n            BottomNavigationView bottomNavigationView = findViewById(R.id.bottomNavigationView);\n    \n            FragmentManager fragmentManager = getSupportFragmentManager();\n            transaction = fragmentManager.beginTransaction();\n    \n            homeFragment = new HomeFragment();\n            interactionFragment = new InteractionsFragment();\n            highlightsFragment = new HighlightsFragment();\n            searchFragment = new SearchFragment();\n    \n    \n            signalConnectionsMainHelper = new SignalRConnectionsMainHelper(this, interactionFragment, userGuidSP);\n            signalRFollowsMainHelper = new SignalRFollowsMainHelper(this, interactionFragment, userGuidSP);\n    \n            new Thread(() -&gt; {\n                transaction.add(R.id.fragment_container, homeFragment);\n                transaction.add(R.id.fragment_container, interactionFragment);\n                transaction.add(R.id.fragment_container, highlightsFragment);\n                transaction.add(R.id.fragment_container, searchFragment);\n    \n                toolbar.setTitle(&quot;Home&quot;);\n    \n                transaction.show(homeFragment);\n                transaction.hide(interactionFragment);\n                transaction.hide(highlightsFragment);\n                transaction.hide(searchFragment);\n                transaction.commit();  // crashes in RUN, sometimes works in DEBUG\n            }).start();\n    \n    \n            //setCurrentFragment(homeFragment, &quot;Home&quot;);\n    \n            bottomNavigationView.setOnItemSelectedListener(item -&gt; {\n                FragmentTransaction transactionTemp = getSupportFragmentManager().beginTransaction();\n    \n                switch (item.getItemId()) {\n                    case R.id.home:\n                        toolbar.setTitle(&quot;Home&quot;);\n                        transactionTemp.show(homeFragment);\n                        transactionTemp.hide(interactionFragment);\n                        transactionTemp.hide(highlightsFragment);\n                        transactionTemp.hide(searchFragment);\n                        transactionTemp.commit();\n                        break;\n                    case R.id.interations:\n                        toolbar.setTitle(&quot;Interactions&quot;);\n                        transactionTemp.hide(homeFragment);\n                        transactionTemp.show(interactionFragment);\n                        transactionTemp.hide(highlightsFragment);\n                        transactionTemp.hide(searchFragment);\n                        transactionTemp.commit();\n                        break;\n                    case R.id.highlights:\n                        toolbar.setTitle(&quot;Highlights&quot;);\n                        transactionTemp.hide(homeFragment);\n                        transactionTemp.hide(interactionFragment);\n                        transactionTemp.show(highlightsFragment);\n                        transactionTemp.hide(searchFragment);\n                        transactionTemp.commit();\n                        break;\n                    case R.id.search:\n                        toolbar.setTitle(&quot;Search&quot;);\n                        transactionTemp.hide(homeFragment);\n                        transactionTemp.hide(interactionFragment);\n                        transactionTemp.hide(highlightsFragment);\n                        transactionTemp.show(searchFragment);\n                        transactionTemp.commit();\n                        break;\n                }\n                return true;\n            });\n    \n            ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(\n                    this, drawerLayout, toolbar, R.string.nav_open, R.string.nav_close);\n            drawerLayout.addDrawerListener(toggle);\n            toggle.syncState();\n            navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {\n    \n                // Called when an item in the NavigationView is selected.\n                @Override\n                public boolean onNavigationItemSelected(@NonNull MenuItem item) {\n                    // Handle the selected item based on its ID\n                    FragmentTransaction transactionTemp = getSupportFragmentManager().beginTransaction();\n                    if (item.getItemId() == R.id.nav_home) {\n                        toolbar.setTitle(&quot;Home&quot;);\n                        transactionTemp.show(homeFragment);\n                        transactionTemp.hide(interactionFragment);\n                        transactionTemp.hide(highlightsFragment);\n                        transactionTemp.hide(searchFragment);\n                        transactionTemp.commit();\n                        MenuItem itemBottomNav = bottomNavigationView.getMenu().findItem(R.id.home);\n                        itemBottomNav.setChecked(true);\n                        // Show a Toast message for the Account item\n                        //Toast.makeText(MainActivity.this,\n                            //    &quot;Account Details&quot;, Toast.LENGTH_SHORT).show();\n                    }\n    \n                    if (item.getItemId() == R.id.nav_interactions) {\n                        toolbar.setTitle(&quot;Interactions&quot;);\n                        transactionTemp.hide(homeFragment);\n                        transactionTemp.show(interactionFragment);\n                        transactionTemp.hide(highlightsFragment);\n                        transactionTemp.hide(searchFragment);\n                        transactionTemp.commit();\n                        MenuItem itemBottomNav = bottomNavigationView.getMenu().findItem(R.id.interations);\n                        itemBottomNav.setChecked(true);\n                        // Show a Toast message for the Settings item\n                        //Toast.makeText(MainActivity.this,\n                             //   &quot;Settings Opened&quot;, Toast.LENGTH_SHORT).show();\n                    }\n    \n                    if (item.getItemId() == R.id.nav_highlights) {\n                        toolbar.setTitle(&quot;Highlights&quot;);\n                        transactionTemp.hide(homeFragment);\n                        transactionTemp.hide(interactionFragment);\n                        transactionTemp.show(highlightsFragment);\n                        transactionTemp.hide(searchFragment);\n                        transactionTemp.commit();\n                        MenuItem itemBottomNav = bottomNavigationView.getMenu().findItem(R.id.highlights);\n                        itemBottomNav.setChecked(true);\n                        // Show a Toast message for the Logout item\n                        //Toast.makeText(MainActivity.this,\n                             //   &quot;You are Logged Out&quot;, Toast.LENGTH_SHORT).show();\n                    }\n    \n                    if (item.getItemId() == R.id.nav_search) {\n                        toolbar.setTitle(&quot;Search&quot;);\n                        transactionTemp.hide(homeFragment);\n                        transactionTemp.hide(interactionFragment);\n                        transactionTemp.hide(highlightsFragment);\n                        transactionTemp.show(searchFragment);\n                        transactionTemp.commit();\n                        MenuItem itemBottomNav = bottomNavigationView.getMenu().findItem(R.id.search);\n                        itemBottomNav.setChecked(true);\n                        // Show a Toast message for the Logout item\n                        //Toast.makeText(MainActivity.this,\n                        //   &quot;You are Logged Out&quot;, Toast.LENGTH_SHORT).show();\n                    }\n    \n                    // Close the drawer after selection\n                    drawerLayout.closeDrawers();\n                    // Indicate that the item selection has been handled\n                    return true;\n                }\n            });\n    \n            // Add a callback to handle the back button press\n            getOnBackPressedDispatcher().addCallback(this, new OnBackPressedCallback(true) {\n                // Called when the back button is pressed.\n                @Override\n                public void handleOnBackPressed() {\n                    // Check if the drawer is open\n                    if (drawerLayout.isDrawerOpen(GravityCompat.START)) {\n                        // Close the drawer if it's open\n                        drawerLayout.closeDrawer(GravityCompat.START);\n                    } else {\n                        // Finish the activity if the drawer is closed\n                        finish();\n                    }\n                }\n            });\n        }\n    \n        private void setCurrentFragment(Fragment fragment, String title) {\n            toolbar.setTitle(title);\n            getSupportFragmentManager()\n                    .beginTransaction()\n                    .replace(R.id.fragment_container, fragment)\n                    .commit();\n        }\n    }\n</code></pre>\n<p>Is this something to do with Android Studio or is this to do with my code?</p>\n<p>I tried:</p>\n<pre><code>new Thread(() -&gt; {\n        transaction.add(R.id.fragment_container, homeFragment);\n        transaction.add(R.id.fragment_container, interactionFragment);\n        transaction.add(R.id.fragment_container, highlightsFragment);\n        transaction.add(R.id.fragment_container, searchFragment);\n\n        toolbar.setTitle(&quot;Home&quot;);\n\n        transaction.show(homeFragment);\n        transaction.hide(interactionFragment);\n        transaction.hide(highlightsFragment);\n        transaction.hide(searchFragment);\n        transaction.commit();  // crashes in RUN, sometimes works in DEBUG\n    }).start();\n</code></pre>\n<p>But still no luck.</p>\n"
  }, {
    "tags" : [ "java", "arrays", "algorithm" ],
    "owner" : {
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      "display_name" : "SHOBANA G",
      "link" : "https://stackoverflow.com/users/25783170/shobana-g"
    },
    "is_answered" : true,
    "view_count" : 146,
    "closed_date" : 1764666642,
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    "last_edit_date" : 1764666550,
    "question_id" : 79835034,
    "link" : "https://stackoverflow.com/questions/79835034/how-to-calculate-mirrored-sum-of-an-array-in-java",
    "closed_reason" : "Duplicate",
    "title" : "How to calculate mirrored sum of an array in Java?",
    "body" : "<p>I am trying to calculate the sum of mirrored elements in an array using Java.</p>\n<p>A mirrored element pair is formed by pairing the first element with the last, second element with the second last, and so on.<br />\nIf the array has an odd length, the middle element should be added as-is. I want to implement this efficiently, ideally using a two-pointer approach.</p>\n<p>For example, with the input:</p>\n<pre class=\"lang-none prettyprint-override\"><code>5\n1 2 3 4 5\n</code></pre>\n<p>The expected output is:</p>\n<pre class=\"lang-none prettyprint-override\"><code>15\n</code></pre>\n<p>Explanation: Pairs: (1+5)=6, (2+4)=6, middle element=3 → Total = 6+6+3 = 15</p>\n<p>Code I tried:</p>\n<pre class=\"lang-java prettyprint-override\"><code>import java.util.*;\n\npublic class MirrorSum {\n    public static void main(String[] args) {\n        Scanner sc = new Scanner(System.in);\n\n        int N = sc.nextInt();\n        int[] A = new int[N];\n\n        for(int i = 0; i &lt; N; i++) {\n            A[i] = sc.nextInt();\n        }\n\n        int sum = 0;\n        // I am not sure how to correctly add mirrored pairs efficiently\n        System.out.println(sum);\n    }\n}\n</code></pre>\n<p>How can I efficiently calculate the sum of mirrored pairs in Java, especially for large arrays? I would like to know the best approach to do this, preferably using two pointers.</p>\n<p>Update: For just summing the elements, you could simply add them all. But the exercise is about mirrored pairs, which is a common technique in programming for handling arrays symmetrically. Using mirrored pairs prepares you for problems where you might multiply pairs, check conditions, or find mirrored maximums, not just sum. –</p>\n<p>Summing mirrored pairs in this problem produces the same result as summing all elements. The purpose of using mirrored pairs is likely to teach the two-pointer technique and prepare for problems where operations on mirrored pairs differ from the total sum.</p>\n"
  }, {
    "tags" : [ "java", "c#", "go", "domain-driven-design" ],
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      "display_name" : "Erfan Mirhoseini",
      "link" : "https://stackoverflow.com/users/10357025/erfan-mirhoseini"
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    "question_id" : 79835008,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79835008/representing-4-types-of-card-templates-adhering-to-ddd",
    "title" : "Representing 4 types of Card Templates Adhering to DDD",
    "body" : "<p>I have an Entity Called CardTemplate. For physical cards, there will have to be a pattern chosen to physically print the card. And based on the two types of operations that the cards are allowed to do, the templates must also have a range of possible card numbers as a property if the cards are going to be used for banking operations (operation type1) and no range is needed otherwise(operation type 2). So we will have 4 types of cards: physical with operation type 1, physical with operation type 2, virtual with operation type 1, and virtual with operation type 2.</p>\n<p>How can I represent these in code while implementing the rules for each type of card? I first thought of having 4 types, but what if there were another IF (if the card is x then y)? We will then have to have 8 types</p>\n"
  }, {
    "tags" : [ "java", "swing", "user-interface", "archlinux" ],
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      "display_name" : "MMT007_backUP",
      "link" : "https://stackoverflow.com/users/19609110/mmt007-backup"
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    "last_activity_date" : 1764934986,
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    "question_id" : 79834897,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79834897/java-swing-invisible-image",
    "title" : "Java Swing Invisible Image",
    "body" : "<h1>Context:</h1>\n<p>I'm trying to make an app with java swing, however when trying to add a background to the Login Page, the image does not show up. It is there and moves other JComponents when adding a layout to the root JPanel of the Page, it just, doesn't display the image. I've also tried JavaFX but it seems like I'm having the same problem over there.</p>\n<p>I've also tried to find if anyone else has the same problem, however couldn't find anything useful. After spending a whole day trying to figure out a solution, I resorted to asking over here</p>\n<h2>Pc Info:</h2>\n<p>This is my PC info if it sums up to be a DE promblem</p>\n<pre><code>                  -`                     mmt007@mmt007desktop\n                 .o+`                    --------------------\n                `ooo/                    OS: Arch Linux x86_64\n               `+oooo:                   Host: B75M-D3P\n              `+oooooo:                  Kernel: Linux 6.17.6-arch1-1\n              -+oooooo+:                 Uptime: 21 mins\n            `/:-:++oooo+:                Packages: 1022 (pacman), 26 (flatpak)\n           `/++++/+++++++:               Shell: bash 5.3.3\n          `/++++++++++++++:              Display (WX942): 1440x900 in 19&quot;, 60 Hz [External]\n         `/+++ooooooooooooo/`            WM: Hyprland 0.51.1 (Wayland)\n        ./ooosssso++osssssso+`           Theme: Adwaita-dark [GTK2/3/4]\n       .oossssso-````/ossssss+`          Icons: Adwaita [GTK2/3/4]\n      -osssssso.      :ssssssso.         Font: Noto Sans (12pt) [Qt], Adwaita Sans (11pt) [GTK2/3/4]\n     :osssssss/        osssso+++.        Cursor: default (24px)\n    /ossssssss/        +ssssooo/-        Terminal: kitty 0.43.1\n  `/ossssso+/:-        -:/+osssso+-      Terminal Font: NimbusMonoPS-Regular (11pt)\n `+sso+:-`                 `.-/+oso:     CPU: Intel(R) Core(TM) i5-3570 (4) @ 3.80 GHz\n`++:.                           `-/+/    GPU: Intel Xeon E3-1200 v2/3rd Gen Core processor Graphics Controller @ 1.15 GHz [Integrated]\n.`                                 `/    Memory: 3.73 GiB / 7.62 GiB (49%)\n                                         Swap: 0 B / 4.00 GiB (0%)\n                                         Disk (/): 82.46 GiB / 214.08 GiB (39%) - ext4\n                                         Locale: en_US.UTF-8\n</code></pre>\n<h2>The Code:</h2>\n<p>And here is the code that is giving me problems:</p>\n<h3>Login Page class:</h3>\n<pre class=\"lang-java prettyprint-override\"><code>public class LoginPage extends Page {\n    protected void init() {\n        root.setLayout(new FlowLayout());\n\n        JImageLabel background = new JImageLabel(new ImageIcon(&quot;assets/backgrounds/login_background.png&quot;));\n        background.setSize(400,400);\n\n        background.setPreferredSize(new Dimension(800,100));\n\n        root.add(background);\n        root.setBackground(Color.BLACK);\n    }\n\n}\n</code></pre>\n<h3>Page class:</h3>\n<pre class=\"lang-java prettyprint-override\"><code>public abstract class Page {\n    protected final JPanel root = new JPanel();\n\n    public Page() { init(); }\n\n    protected abstract void init();\n}\n</code></pre>\n<h3>JImageLabel class:</h3>\n<pre class=\"lang-java prettyprint-override\"><code>public class JImageLabel extends JLabel {\n    private ImageIcon image;\n\n    public JImageLabel(ImageIcon image)\n    {super(image);}\n}\n</code></pre>\n<h3>Window class:</h3>\n<pre class=\"lang-java prettyprint-override\"><code>public class Window extends JFrame {\n    private static final Window INSTANCE = new Window(&quot;Disbot&quot;);\n\n    private static final Dimension DEFAULT_WINDOW_SIZE = new Dimension(1280,720);\n    private static Page page = null;\n\n    private Window(String title) throws HeadlessException\n    {super(title);}\n\n    public static void init(){\n        INSTANCE.setDefaultCloseOperation(EXIT_ON_CLOSE);\n        INSTANCE.setSize(DEFAULT_WINDOW_SIZE);\n\n        INSTANCE.setVisible(true);\n    }\n\n    public static void setPage(Page new_page){\n        page = new_page;\n        INSTANCE.setContentPane(page.root);\n        INSTANCE.repaint();\n    }\n}\n</code></pre>\n<h3>Main Class:</h3>\n<pre class=\"lang-java prettyprint-override\"><code>public class Main {\n    public static void main(String[] args) {\n        SwingUtilities.invokeLater(() -&gt; {\n            Window.init();\n            Window.setPage(new LoginPage());\n        });\n    }\n}\n</code></pre>\n<h2>Screenshots:</h2>\n<p><a href=\"https://i.sstatic.net/YjMwcVpx.png\" rel=\"nofollow noreferrer\"><img src=\"https://i.sstatic.net/YjMwcVpx.png\" alt=\"image1 - black blank screen\" /></a>\n<a href=\"https://i.sstatic.net/f5BAPRK6.png\" rel=\"nofollow noreferrer\"><img src=\"https://i.sstatic.net/f5BAPRK6.png\" alt=\"image2 - two jbuttons on either side of the invisible image\" /></a></p>\n"
  }, {
    "tags" : [ "java", "android", "surfaceview" ],
    "owner" : {
      "account_id" : 3017087,
      "reputation" : 308,
      "user_id" : 2558929,
      "user_type" : "registered",
      "accept_rate" : 100,
      "profile_image" : "https://www.gravatar.com/avatar/5d3d0aadc37091c3e37e4d9d9ff1584f?s=256&d=identicon&r=PG",
      "display_name" : "Tomas F.",
      "link" : "https://stackoverflow.com/users/2558929/tomas-f"
    },
    "is_answered" : true,
    "view_count" : 57,
    "answer_count" : 1,
    "score" : 0,
    "last_activity_date" : 1764602206,
    "creation_date" : 1764588159,
    "last_edit_date" : 1764602206,
    "question_id" : 79834742,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79834742/android-java-surfaceview-declaring-and-hiding",
    "title" : "Android Java Surfaceview, declaring and hiding",
    "body" : "<p>I have a main activity with a button. When I press the button, a hidden <code>SurfaceView</code> becomes visible and an animation shows. It's working really well, but I have two problems.</p>\n<p>First, what is the proper way to declare an external <code>SurfaceView</code> class in the manifest? I have declared it as a normal activity, but I'm pretty sure it's not the correct way. Android studio says:</p>\n<blockquote>\n<p>The class should provide a default constructor (a public constructor with no arguments).</p>\n</blockquote>\n<p>How do I do that?</p>\n<p>Second, when the animation is finished I want to hide the <code>SurfaceView</code> again. How and where do I do this?</p>\n<p>Manifest:</p>\n<pre class=\"lang-xml prettyprint-override\"><code>&lt;activity\n    android:name=&quot;com.lammet.intervaltimer.ClockSurfaceView&quot;\n    android:theme=&quot;@style/Theme.IntervalTimer&quot;\n    android:configChanges=&quot;locale|orientation&quot;\n    android:exported=&quot;false&quot;&gt;\n    &lt;intent-filter&gt;\n        &lt;action android:name=&quot;android.intent.action.INTERVALSURFACEVIEW&quot; /&gt;\n        &lt;category android:name=&quot;android.intent.category.LAUNCHER&quot; /&gt;\n    &lt;/intent-filter&gt;\n&lt;/activity&gt; \n</code></pre>\n<p>Main Activity:</p>\n<pre class=\"lang-java prettyprint-override\"><code>binding.setIntervalGoButton.setOnClickListener(v -&gt; {\n    binding.setIntervalLayout.setVisibility(View.GONE);\n    binding.clockSurfaceview.setVisibility(View.VISIBLE);\n    invalidateOptionsMenu();\n});\n</code></pre>\n<p>intervalSurfaceView:</p>\n<pre class=\"lang-java prettyprint-override\"><code>public class IntervalSurfaceView extends SurfaceView implements SurfaceHolder.Callback, Runnable {\n    public IntervalSurfaceView(Context context, AttributeSet attrs) {\n        super(context, attrs);\n        surfaceHolder = getHolder();\n        surfaceHolder.addCallback(this);\n    }\n    @Override\n    public void surfaceCreated(@NonNull SurfaceHolder holder) {\n        gIsIntervalRunning = true;\n        drawingThread = new Thread(this);\n        drawingThread.start();\n    }\n    @Override\n    public void surfaceChanged(@NonNull SurfaceHolder holder, int format, int width, int height) {\n    }\n    @Override\n    public void surfaceDestroyed(@NonNull SurfaceHolder holder) {\n        gIsIntervalRunning = false;\n        try {\n            drawingThread.join(); // Wait for the thread to finish\n        } catch (InterruptedException e) {\n            Thread.currentThread().interrupt();\n        }\n    }\n    @Override\n    public void run() {\n        while (gIsIntervalRunning) {\n            Canvas canvas = null;\n            try {\n                canvas = surfaceHolder.lockCanvas();\n                if (canvas != null) {\n                    synchronized (surfaceHolder) {\n                        drawInterval(canvas);\n                    }\n                }\n            } finally {\n                if (canvas != null) {\n                    surfaceHolder.unlockCanvasAndPost(canvas);\n                }\n            }\n            try {\n                Thread.sleep(100); // Approximately 60 FPS\n            } catch (InterruptedException e) {\n                Thread.currentThread().interrupt();\n            }\n        }\n    }\n    protected static void drawInterval(Canvas canvas) {\n    // The animation is drawn\n    if (animation == finished) gIsIntervalRunning = false;\n    }\n</code></pre>\n"
  }, {
    "tags" : [ "java", "generics", "lower-bound" ],
    "owner" : {
      "account_id" : 2238186,
      "reputation" : 4365,
      "user_id" : 1973933,
      "user_type" : "registered",
      "accept_rate" : 58,
      "profile_image" : "https://www.gravatar.com/avatar/45e1e6d2acd53544362e57016421d3bf?s=256&d=identicon&r=PG",
      "display_name" : "Melad Basilius",
      "link" : "https://stackoverflow.com/users/1973933/melad-basilius"
    },
    "is_answered" : true,
    "view_count" : 62,
    "answer_count" : 4,
    "score" : 0,
    "last_activity_date" : 1764609958,
    "creation_date" : 1764587392,
    "last_edit_date" : 1764588047,
    "question_id" : 79834724,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79834724/lower-bounded-wildcards-is-it-about-supertype-or-subtype",
    "title" : "Lower Bounded Wildcards: is it about superType or subType",
    "body" : "<p><a href=\"https://docs.oracle.com/javase/tutorial/java/generics/lowerBounded.html\" rel=\"nofollow noreferrer\">Oracle documentation</a> mentioned it clearly.</p>\n<blockquote>\n<p>a <em>lower bounded</em> wildcard restricts the unknown type to be a specific type or a <em>super type</em> of that type.</p>\n</blockquote>\n<blockquote>\n<p>To write the method that works on lists of Integer and the <strong>supertypes</strong> of Integer, such as Integer, Number, and Object, you would specify List&lt;? super Integer&gt;. The term List&lt;Integer&gt; is more restrictive than List&lt;? super Integer&gt; because the former matches a list of type Integer only, whereas the latter matches a list of any type<br />\nthat is a supertype of Integer.</p>\n</blockquote>\n<p>However when I try to add a supertype to a lower bounded collection it produce compiler error.</p>\n<pre><code>\n\nclass Item {\n}\n\nclass SubItem1 extends Item {\n}\n\nclass SubItem2 extends Item {\n}\n\nclass ItemManager {\n    public Collection&lt;? super Item&gt; items;\n\n    public void addItems() {\n        items.add(new Item());\n        items.add(new SubItem1());\n        items.add(new SubItem2());\n        items.add(new Object()); //compiler error\n    }\n}\n</code></pre>\n<p>Does the expression <strong>Collection&lt;? super Item&gt;</strong> means any superType to Item or any subType of Item <strong>?</strong></p>\n"
  }, {
    "tags" : [ "java", "blockchain", "web3-java" ],
    "owner" : {
      "account_id" : 43361420,
      "reputation" : 1,
      "user_id" : 31964191,
      "user_type" : "registered",
      "profile_image" : "https://www.gravatar.com/avatar/68266ef892fc6f2dd4136a32ca42347b?s=256&d=identicon&r=PG&f=y&so-version=2",
      "display_name" : "강백호",
      "link" : "https://stackoverflow.com/users/31964191/%ea%b0%95%eb%b0%b1%ed%98%b8"
    },
    "is_answered" : false,
    "view_count" : 17,
    "answer_count" : 0,
    "score" : 0,
    "last_activity_date" : 1764587328,
    "creation_date" : 1764587328,
    "question_id" : 79834721,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79834721/even-when-connecting-web3j-via-websocket-i-can-t-receive-blocks-instantly",
    "title" : "Even when connecting Web3j via WebSocket, I can’t receive blocks instantly",
    "body" : "<p>I made sure the RPC URL definitely starts with <strong>wss</strong>, but Web3j still keeps fetching blocks at specific intervals instead of receiving them in real time.<br />\nDo I need to call a different method?<br />\nMy Web3j version is <strong>5.0.1</strong>.</p>\n<pre><code>WebSocketService ws = new WebSocketService(chain.getWsRpc(), false);\n\ntry {\n    ws.connect();\n} catch (ConnectException e) {\n    log.error(&quot;Connection Error: {}&quot;, e.getMessage(), e);\n}\n\nWeb3j web3j1 = Web3j.build(ws);\nweb3j1.blockFlowable(false).subscribe(block -&gt; {\n    System.out.println(&quot;New block number: &quot; + block.getBlock().getNumber());\n});\n</code></pre>\n<p>It fetches multiple blocks in batches every 3–4 seconds.<br />\nThe networks I used are <strong>Polygon (amoy)</strong> and Infura.io’s <strong>free plan RPC</strong>.</p>\n"
  }, {
    "tags" : [ "java", "android", "google-cloud-firestore" ],
    "owner" : {
      "account_id" : 43828404,
      "reputation" : 17,
      "user_id" : 31437107,
      "user_type" : "registered",
      "profile_image" : "https://www.gravatar.com/avatar/e066c4c6ab11a24e1953f9f5f05c2b04?s=256&d=identicon&r=PG&f=y&so-version=2",
      "display_name" : "999",
      "link" : "https://stackoverflow.com/users/31437107/999"
    },
    "is_answered" : false,
    "view_count" : 28,
    "closed_date" : 1764585830,
    "answer_count" : 0,
    "score" : -2,
    "last_activity_date" : 1764594517,
    "creation_date" : 1764585250,
    "last_edit_date" : 1764594517,
    "question_id" : 79834681,
    "link" : "https://stackoverflow.com/questions/79834681/firestore-only-updates-when-the-activity-using-it-is-accessed-through-a-specific",
    "closed_reason" : "Duplicate",
    "title" : "Firestore only updates when the activity using it is accessed through a specific Android activity",
    "body" : "<p>I'm working on an Android app where users can add and remove restaurants from their favourites via the RestaurantPage activity. When I access the RestaurantPage activity from the UserFavourites activity and attempt to remove the restaurant from my favourites, Firestore successfully updates, removing the restaurant from my favourites in the database. However, when I access a restaurant via the Search activity, I cannot remove the restaurant from my favourites (Firestore isn't updated when the favourite button is clicked). Here is the code for my RestaurantPage activity, UserFavourites activity, Search activity and AppManager class. I'm new to Android developing so any help would be much appreciated!</p>\n<p>RestaurantPage:</p>\n<pre><code>\n\nimport android.content.Intent;\nimport android.net.Uri;\nimport android.os.Bundle;\nimport android.util.Log;\nimport android.widget.Button;\n\nimport java.util.ArrayList;\n\n\npublic class RestaurantPage extends AppCompatActivity {\n\n    Button favourited;\n    \n    \n    \n\n   \n\n    @Override\n    protected void onCreate(Bundle savedInstanceState) {\n        super.onCreate(savedInstanceState);\n        EdgeToEdge.enable(this);\n        setContentView(R.layout.menu_restaurantpage);\n        favourited = findViewById(R.id.favouriteButton);\n\n        Restaurant currRestaurant = AppManager.getCurrentRestaurant();\n        \n        ArrayList&lt;Restaurant&gt; currFavourites = AppManager.getCurrentUser().getFavourites();\n        Log.d(&quot;CURR USER&quot;, AppManager.getCurrentUser().getUsername());\n\n        int i = 0;\n        boolean flag = false;\n        while (i &lt; currFavourites.size() &amp;&amp; !flag){\n            if (currFavourites.get(i).getName().equals(currRestaurant.getName())){\n                flag = true;\n            }\n            i++;\n        }\n\n        if (flag) {\n            favourited.setText(&quot;Remove from favourites&quot;);\n        }\n        else {\n            favourited.setText(&quot;Add to favourites&quot;);\n        }\n\n\n\n        favourited.setOnClickListener((view) -&gt; {\n            ArrayList&lt;Restaurant&gt; currentFavourites = AppManager.getCurrentUser().getFavourites();\n            int j = 0;\n            boolean flag2 = false;\n            while (j &lt; currentFavourites.size() &amp;&amp; !flag2) {\n                if (currentFavourites.get(j).getName().equals(currRestaurant.getName())) {\n                    flag2 = true;\n                }\n                j++;\n            }\n\n            if (flag2) {\n                AppManager.getCurrentUser().removeFavourite(currRestaurant);\n                favourited.setText(&quot;Add to favourites&quot;);\n            }\n            else {\n                AppManager.getCurrentUser().addFavourite(currRestaurant);\n                favourited.setText(&quot;Remove from favourites&quot;);\n            }\n            AppManager.uploadUser(AppManager.getCurrentUser());\n        });\n\n        \n\n\n     \n    }\n\n\n}\n</code></pre>\n<p>UserFavourites:</p>\n<pre><code>\n\n\npublic class UserFavourites extends AppCompatActivity implements AdapterView.OnItemSelectedListener {\n\n    private FirebaseAuth authenticate;\n    private ArrayList&lt;User&gt; userList;\n\n    private User currentUser;\n\n    private SearchView favouritesBar;\n\n    private RecyclerView favouritesRecyclerView;\n\n    private SearchAdapter searchAdapter;\n\n\n    @Override\n    protected void onCreate(Bundle savedInstanceState) {\n        super.onCreate(savedInstanceState);\n        EdgeToEdge.enable(this);\n        setContentView(R.layout.menu_favourites);\n        authenticate = FirebaseAuth.getInstance();\n\n       \n\n        favouritesRecyclerView = findViewById(R.id.favourites_list);\n\n        favouritesRecyclerView.setItemAnimator(new DefaultItemAnimator());\n        favouritesRecyclerView.addItemDecoration(new DividerItemDecoration(this, LinearLayoutManager.VERTICAL));\n        currentUser = AppManager.getCurrentUser();\n        if (currentUser == null){\n            Log.d( &quot;USER FAIL&quot;, &quot;No user found&quot;);\n            startActivity(new Intent(UserFavourites.this, HomeScreen.class));\n            return;\n        }\n        else {\n            Log.d(&quot;USER FOUND&quot;, &quot;User found&quot;);\n        }\n\n        searchAdapter = new SearchAdapter(currentUser.getFavourites(), UserFavourites.this, new SearchAdapter.ItemClickListener() {\n            @Override\n            public void onItemClick(Restaurant restaurant) {\n                Log.d(&quot;NEWPAGE&quot;, &quot;User sent to restaurant page for &quot; + restaurant.getName());\n                AppManager.setCurrentRestaurant(restaurant);\n                startActivity(new Intent(UserFavourites.this, RestaurantPage.class));\n            }\n        });\n\n\n    }\n\n    \n\n\n}\n</code></pre>\n<p>Search:</p>\n<pre><code>public class Search extends AppCompatActivity implements AdapterView.OnItemSelectedListener {\n\n    protected ArrayList&lt;Restaurant&gt; searchList;\n    protected RecyclerView searchRecyclerView;\n    SearchAdapter searchAdapter;\n\n   \n\n    private DrawerLayout nav_layout;\n    private Toolbar nav_toolbar;\n\n    private NavigationView nav_view;\n\n    private ArrayList&lt;User&gt; userList;\n\n    private User currentUser;\n\n    private FirebaseAuth authenticate;\n\n\n\n    @Override\n    protected void onCreate(Bundle savedInstanceState) {\n        super.onCreate(savedInstanceState);\n        EdgeToEdge.enable(this);\n        setContentView(R.layout.menu_searchpage);\n        nav_layout = findViewById(R.id.nav_layout);\n        nav_toolbar = findViewById(R.id.nav_toolbar);\n        nav_view = findViewById(R.id.navigationView);\n        nav_view.setItemIconTintList(null);\n\n        searchRecyclerView = findViewById(R.id.search_list);\n        searchRecyclerView.setItemAnimator(new DefaultItemAnimator());\n        searchRecyclerView.addItemDecoration(new DividerItemDecoration(this, LinearLayoutManager.VERTICAL));\n        searchList = AppManager.getRestaurants();\n        authenticate = FirebaseAuth.getInstance();\n        currentUser = AppManager.getCurrentUser();\n        if (currentUser == null){\n            Log.d( &quot;USER FAIL&quot;, &quot;No user found&quot;);\n            startActivity(new Intent(Search.this, HomeScreen.class));\n            return;\n        }\n        else {\n            Log.d(&quot;USER FOUND&quot;, &quot;User found&quot;);\n            \n        }\n\n\n        searchAdapter = new SearchAdapter(searchList, Search.this, new SearchAdapter.ItemClickListener() {\n            @Override\n            public void onItemClick(Restaurant restaurant) {\n                Log.d(&quot;NEWPAGE&quot;, &quot;User sent to restaurant page for &quot; + restaurant.getName());\n                AppManager.setCurrentRestaurant(restaurant);\n                startActivity(new Intent(Search.this, RestaurantPage.class));\n\n            }\n        });\n\n       \n    }\n\n}\n</code></pre>\n<p>AppManager:</p>\n<pre><code>package com.example.csia;\nimport android.util.Log;\n\nimport com.google.firebase.firestore.AggregateQuery;\nimport com.google.firebase.firestore.AggregateQuerySnapshot;\nimport com.google.firebase.firestore.AggregateSource;\nimport com.google.firebase.firestore.FirebaseFirestore;\nimport com.google.firebase.firestore.QueryDocumentSnapshot;\n\nimport java.util.ArrayList;\n\n\npublic class AppManager {\n\n    private static int numOfRestaurants;\n    private static FirebaseFirestore db = FirebaseFirestore.getInstance();\n    private static ArrayList&lt;User&gt; users = new ArrayList&lt;User&gt;();\n    protected static ArrayList&lt;Restaurant&gt; restaurants = new ArrayList&lt;Restaurant&gt;();\n\n    private static Restaurant currentRestaurant;\n    private static User currentUser;\n\n\n\n\n    public static ArrayList&lt;User&gt; getUsersImmediately(){\n        return users;\n    }\n    public static ArrayList&lt;User&gt; getUsers(){\n        users.clear();\n        db.collection(&quot;users&quot;).get()\n                .addOnCompleteListener((task) -&gt; {\n                    if (task.isSuccessful()) {\n                        for (QueryDocumentSnapshot document : task.getResult()) {\n                            users.add(document.toObject(User.class));\n                            Log.d(&quot;USER ADD&quot;, &quot;Added user to user list&quot;);\n\n                        }\n                        Log.d(&quot;DOWNLOAD DB&quot;, &quot;Successfully obtained users&quot;);\n\n                    }\n                })\n                .addOnFailureListener((task) -&gt; {\n                    Log.d(&quot;DOWNLOAD DB&quot;, &quot;Failed to obtain users&quot;);\n                });\n\n        return users;\n    }\n\n\n\n\n    public static void downloadRestaurants(){\n\n        restaurants.clear();\n        db.collection(&quot;restaurants&quot;).get()\n                .addOnCompleteListener((task) -&gt; {\n                    if (task.isSuccessful()) {\n                        for (QueryDocumentSnapshot document : task.getResult()) {\n                            restaurants.add(document.toObject(Restaurant.class));\n                            Log.d(&quot;RESTAURANT ADD&quot;, &quot;Added restaurant to restaurant list&quot;);\n\n                        }\n                        Log.d(&quot;DOWNLOAD DB&quot;, &quot;Successfully downloaded restaurants&quot;);\n\n                    }\n                })\n                .addOnFailureListener((task) -&gt; {\n                    Log.d(&quot;DOWNLOAD DB&quot;, &quot;Failed to download restaurants&quot;);\n                });\n\n\n    }\n\n\n    public static void downloadUsers(){\n\n        users.clear();\n        db.collection(&quot;users&quot;).get()\n                .addOnCompleteListener((task) -&gt; {\n                    if (task.isSuccessful()) {\n                        for (QueryDocumentSnapshot document : task.getResult()) {\n                            users.add(document.toObject(User.class));\n                            Log.d(&quot;USER ADD&quot;, &quot;Added user to user list&quot;);\n\n                        }\n                        Log.d(&quot;DOWNLOAD DB&quot;, &quot;Successfully downloaded users&quot;);\n\n                    }\n                })\n                .addOnFailureListener((task) -&gt; {\n                    Log.d(&quot;DOWNLOAD DB&quot;, &quot;Failed to download users&quot;);\n                });\n\n\n    }\n\n    public static void uploadUser(User user){\n        db.collection(&quot;users&quot;).document(user.getUsername())\n                .set(user)\n                .addOnSuccessListener((task) -&gt; {\n                    Log.d(&quot;UPLOAD DB&quot;, &quot;User &quot; + user.getUsername() + &quot; uploaded to database&quot;);\n                })\n                .addOnFailureListener((task) -&gt;{\n                    Log.d(&quot;UPLOAD DB&quot;, &quot;User could not be uploaded&quot;);\n\n                });\n    }\n\n    public static void uploadRestaurant(Restaurant restaurant){\n        db.collection(&quot;restaurants&quot;).document(restaurant.getName())\n                .set(restaurant)\n                .addOnSuccessListener((task) -&gt; {\n                    Log.d(&quot;UPLOAD DB&quot;, &quot;Restaurant &quot; + restaurant.getName() + &quot; uploaded to database&quot;);\n                })\n                .addOnFailureListener((task) -&gt;{\n                    Log.d(&quot;UPLOAD DB&quot;, &quot;Restaurant could not be uploaded&quot;);\n\n                });\n    }\n\n\n\n\n    public static boolean userExists(String username)\n    {\n        for (int i = 0; i &lt; users.size(); i++)\n        {\n            if (users.get(i).getUsername().equals(username)){\n                return false;\n            }\n        }\n        return true;\n    }\n\n    public static ArrayList&lt;Restaurant&gt; getRestaurants(){\n        restaurants.clear();\n        db.collection(&quot;restaurants&quot;).get()\n                .addOnCompleteListener((task) -&gt; {\n                    if (task.isSuccessful()) {\n                        for (QueryDocumentSnapshot document : task.getResult()) {\n                            restaurants.add(document.toObject(Restaurant.class));\n                            Log.d(&quot;RESTAURANT ADD&quot;, &quot;Added restaurant to restaurant list&quot;);\n\n                        }\n                        Log.d(&quot;DOWNLOAD DB&quot;, &quot;Successfully obtained restaurants&quot;);\n\n                    }\n                })\n                .addOnFailureListener((task) -&gt; {\n                    Log.d(&quot;DOWNLOAD DB&quot;, &quot;Failed to obtain restaurants&quot;);\n                });\n\n        return restaurants;\n    }\n\n\n    \n\n\n    \n\n\n\n    public static Restaurant getRestaurant(int i){\n        return restaurants.get(i);\n    }\n\n\n\n    public static Restaurant getCurrentRestaurant() {\n        return currentRestaurant;\n    }\n\n    public static void setCurrentRestaurant(Restaurant newCurrent) {\n        currentRestaurant = newCurrent;\n    }\n\n    public static User getCurrentUser() {\n        return currentUser;\n    }\n\n    public static void setCurrentUser(User currentUser) {\n        AppManager.currentUser = currentUser;\n    }\n\n}\n\n</code></pre>\n"
  }, {
    "tags" : [ "java", "spring", "jvm", "resttemplate", "mdc" ],
    "owner" : {
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      "display_name" : "Bashir Zamani",
      "link" : "https://stackoverflow.com/users/6672520/bashir-zamani"
    },
    "is_answered" : false,
    "view_count" : 54,
    "answer_count" : 0,
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    "last_activity_date" : 1764584031,
    "creation_date" : 1764584031,
    "question_id" : 79834647,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79834647/why-does-resttemplate-starting-from-java-21-run-on-a-different-thread-even-wit",
    "title" : "Why does RestTemplate, starting from Java 21, run on a different thread even without virtual threads and without @Async, and why does MDC get lost?",
    "body" : "<p>i recently migrated from java17 to 21. I use logback MDC to log http request and response. each http request may lead to execute several resttemplate sync call. i use mdc to generate UUID as traceId in jakarta servlet filter and get MDC befre and after resttemplate call to log traceId and resttemolate request and response. after migrate to java 21 the resttemolate executes in different thread and mdc values missed. even if virtual thread is not enabled.</p>\n"
  }, {
    "tags" : [ "java", "android", "directorystream" ],
    "owner" : {
      "account_id" : 34207086,
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      "display_name" : "Roy",
      "link" : "https://stackoverflow.com/users/26443463/roy"
    },
    "is_answered" : false,
    "view_count" : 77,
    "closed_date" : 1764589663,
    "answer_count" : 0,
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    "last_activity_date" : 1764593235,
    "creation_date" : 1764581886,
    "question_id" : 79834586,
    "link" : "https://stackoverflow.com/questions/79834586/how-to-list-pdf-filenames",
    "closed_reason" : "Duplicate",
    "title" : "How to List pdf filenames",
    "body" : "<p>I cannot get a list of files ending with .pdf, I have tried everything, it lists everything else in the folder, except for the pdf's, what is wrong with this. The program then displays the list in a<br />\nThe folder contains 29 pdf files, and 5 image files(jpg). Please don't suggest using <code>File[] fileList = directory.listFiles();</code>, been there done that, nothing works.</p>\n<p>All permissions are set, otherwise I wouldn't get the 5 image filenames</p>\n<pre><code>private void getFileList()\n{\n    fileList = new ArrayList&lt;&gt;();\n    File directory = getPDFDirectory();\n    try( DirectoryStream&lt;Path&gt; stream =\n            Files.newDirectoryStream( directory.toPath(), &quot;*.*&quot; ))\n    {\n        stream.forEach( path -&gt;\n        {\n            fileList.add( path.getFileName().toString() );\n        });\n\n        Collections.sort( fileList );\n    }\n    catch( IOException e )\n    {\n        Toast.makeText( this, &quot;Cannot read folder&quot;, Toast.LENGTH_SHORT );\n    }\n}\n</code></pre>\n<p>And for those who are curious, here is the <code>getPDFDirectory()</code> code</p>\n<pre><code>/**\n *\n * @return PDF Folder as a file\n */\n@NonNull\nprivate File getPDFDirectory()\n{\n\n    return new File( Environment\n            .getExternalStorageDirectory()\n            .getPath() + File.separatorChar +\n            &quot;Documents&quot; + File.separatorChar +\n            &quot;My App&quot; + File.separatorChar +\n            &quot;Files&quot; );\n}\n</code></pre>\n"
  }, {
    "tags" : [ "java", "spring", "spring-boot", "webclient" ],
    "owner" : {
      "account_id" : 30536733,
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      "display_name" : "Anish",
      "link" : "https://stackoverflow.com/users/23403710/anish"
    },
    "is_answered" : false,
    "view_count" : 75,
    "answer_count" : 0,
    "score" : 0,
    "last_activity_date" : 1764621499,
    "creation_date" : 1764578605,
    "last_edit_date" : 1764608235,
    "question_id" : 79834516,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79834516/spring-webclient-takes-too-long-to-process-the-first-request-subsequent-calls",
    "title" : "Spring WebClient takes too long to process the first request — subsequent calls fast",
    "body" : "<p>I'm using Spring WebClient in my Java application to authenticate with Keycloak.\nThe issue I'm facing is:</p>\n<p>The first WebClient request takes a long time (5-9 seconds), but all subsequent requests are extremely fast.</p>\n<p>This slowdown happens consistently everyday when I try to access the application for the first time.</p>\n<p>Here’s my WebClient configuration:</p>\n<pre><code>@Configuration\npublic class WebClientConfig {\n    @Bean\n    public WebClient webClient() {\n        return WebClient.builder()\n                .codecs(configurer -&gt;\n                        configurer.defaultCodecs().maxInMemorySize(5 * 1024 * 1024) // 5MB limit\n                    )\n                .build();\n        }\n    }\n}\n</code></pre>\n<p>And here is the login method making the Keycloak token call:</p>\n<pre><code>@Override\npublic LoginResponseDto login(LoginRequestDto loginRequestDto) {\n    LinkedMultiValueMap&lt;String, String&gt; formData = getLoginFormDataRequest(loginRequestDto);\n    String uri = UriComponentsBuilder.fromUriString(keycloakProperties.serverUrl())\n                .pathSegment(&quot;realms&quot;, keycloakProperties.realm(), &quot;protocol&quot;, &quot;openid-connect&quot;, &quot;token&quot;)\n                .toUriString();\n\n    try {\n        String response = webClient.post()\n                .uri(uri)\n                .contentType(MediaType.APPLICATION_FORM_URLENCODED)\n                .bodyValue(formData)\n                .retrieve()\n                .bodyToMono(String.class)\n                .block();\n\n        JsonNode jsonNode = objectMapper.readTree(response);\n        return new LoginResponseDto(\n                jsonNode.get(&quot;token_type&quot;).asText(),\n                jsonNode.get(&quot;access_token&quot;).asText(),\n                jsonNode.get(&quot;refresh_token&quot;).asText(),\n                jsonNode.get(&quot;expires_in&quot;).asText(),\n                jsonNode.get(&quot;refresh_expires_in&quot;).asText()\n        );\n    } catch (WebClientResponseException e) {\n        log.error(&quot;Error in Keycloak login: {}&quot;, e.getMessage(), e);\n        if (e.getStatusCode() == HttpStatus.UNAUTHORIZED) {\n            throw new InvalidCredentialsException(&quot;Invalid username or password&quot;, projectUtil.getCurrentUtcTimestamp());\n        }\n        throw new KeycloakServiceException(&quot;Invalid password&quot;, projectUtil.getCurrentUtcTimestamp());\n        } catch (JsonProcessingException e) {\n            log.error(&quot;JsonProcessing error in Keycloak login: {}&quot;, e.getMessage(), e);\n            throw new KeycloakServiceException(&quot;JSON processing error: login&quot;, projectUtil.getCurrentUtcTimestamp());\n        }\n    }\n}\n</code></pre>\n<p>What I’ve observed:</p>\n<ul>\n<li><p>It only happens for the very first request after startup.</p>\n</li>\n<li><p>Could be related to connection pool initialization, DNS lookup, SSL handshake, or WebClient configuration.</p>\n</li>\n<li><p>Using block() — but I need blocking here since this method must return synchronously.</p>\n</li>\n</ul>\n<p>Why does the first WebClient request take significantly longer than subsequent ones, and how can I prevent or reduce this startup delay?</p>\n<p>Any insights, profiling tips, or config improvements would be very helpful.</p>\n"
  }, {
    "tags" : [ "java", "java-17", "doclet", "documentation-tool", "scanner" ],
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      "display_name" : "Nap",
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    "is_answered" : true,
    "view_count" : 63,
    "accepted_answer_id" : 79834891,
    "answer_count" : 1,
    "score" : 4,
    "last_activity_date" : 1764606202,
    "creation_date" : 1764570386,
    "last_edit_date" : 1764606202,
    "question_id" : 79834396,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79834396/java-17-documentation-tool-causes-failed-unknownelementexception-for-record-para",
    "title" : "Java 17 Documentation Tool causes failed UnknownElementException for record parameter",
    "body" : "<p>I am using the javax.tools.DocumentationTool to parse the Documentation of my source code base. I am using Java 17 jdk to run. It is triggering an javax.lang.model.element.UnknownElementException exception when a record method parameter. The code is not even accessed via getter method.</p>\n<p>The stack trace as can be seen is when the record Component is visited.</p>\n<pre><code> [java] error: fatal error encountered: javax.lang.model.element.UnknownElementException: Unknown element: &quot;params&quot;\n [java] error: Please file a bug against the javadoc tool via the Java bug reporting page\n [java]   (https://bugreport.java.com) after checking the Bug Database (https://bugs.java.com)\n [java]   for duplicates. Include error messages and the following diagnostic in your report. Thank you.\n [java] javax.lang.model.element.UnknownElementException: Unknown element: &quot;elements&quot;\n [java]     at java.compiler@17.0.11/javax.lang.model.util.AbstractElementVisitor6.visitUnknown(AbstractElementVisitor6.java:129)\n [java]     at java.compiler@17.0.11/javax.lang.model.element.ElementVisitor.visitRecordComponent(ElementVisitor.java:225)\n [java]     at java.compiler@17.0.11/javax.lang.model.util.AbstractElementVisitor6.visitRecordComponent(AbstractElementVisitor6.java:166)\n [java]     at jdk.compiler/com.sun.tools.javac.code.Symbol$RecordComponent.accept(Symbol.java:1843)\n [java]     at java.compiler@17.0.11/javax.lang.model.util.ElementScanner6.scan(ElementScanner6.java:153)\n</code></pre>\n<p>The code is like below.</p>\n<pre><code>private record MyMethod(MyParam[] params, int length) {\n</code></pre>\n<p>The way the DocumentationTool was called is by calling the visitor scanner specifically a class inheriting the ElementScanner9 object.</p>\n<pre><code>public class MyClassScanner extends ElementScanner9&lt;Void, Integer&gt; {\n...\n    public void startScan(Set&lt;? extends Element&gt; elements) {\n        scan(elements, 0);\n    }\n</code></pre>\n<p>Any ideas for this?</p>\n<p>I called the doclet to scan, <strong>&quot;--show-types public&quot;</strong> does it have any effect?</p>\n"
  }, {
    "tags" : [ "java", "junit", "automation", "playwright", "playwright-java" ],
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      "link" : "https://stackoverflow.com/users/10217907/shivashankar163"
    },
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    "closed_date" : 1764538859,
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    "last_edit_date" : 1764534976,
    "question_id" : 79834151,
    "link" : "https://stackoverflow.com/questions/79834151/im-unable-to-implement-auto-focus-in-iframe",
    "closed_reason" : "Not suitable for this site",
    "title" : "I&#39;m unable to implement auto focus in Iframe",
    "body" : "<p>I'm designing custom automation report(Playwright with Java using Junit). Encountering issue where I'm unable to implement &quot;auto focus&quot; when I click on the scenario in the table. Focus remains in summary table but not to Iframe where it should be pointed at. My entire code is here&lt;https://pastebin.com/aXaJbeR3&gt;</p>\n"
  }, {
    "tags" : [ "java", "maven", "dependencies", "jrecord" ],
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      "display_name" : "ramakrishnar",
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    "question_id" : 79834142,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79834142/jrecord-build-issues-while-trying-to-install-package-through-maven-pom",
    "title" : "JRecord - Build issues while trying to install package through Maven POM",
    "body" : "<p>I am trying out way to install JRecord and CB2XML in my spring boot application. I tried to use the package through POM xml by mentioning the dependencies.</p>\n<pre class=\"lang-xml prettyprint-override\"><code>         &lt;dependency&gt;\n            &lt;groupId&gt;net.sf&lt;/groupId&gt;\n            &lt;artifactId&gt;cb2xml&lt;/artifactId&gt;\n            &lt;version&gt;0.90.2&lt;/version&gt;\n        &lt;/dependency&gt;\n        &lt;dependency&gt;\n            &lt;groupId&gt;net.sf&lt;/groupId&gt;\n            &lt;artifactId&gt;jrecord&lt;/artifactId&gt;\n            &lt;version&gt;0.90.2&lt;/version&gt;\n        &lt;/dependency&gt;\n</code></pre>\n<p>But I get warning as if the dependencies doesn't have pom files.</p>\n<pre class=\"lang-none prettyprint-override\"><code>C:\\Users\\USER\\.jdks\\openjdk-17.0.1\\bin\\java.exe -Dmaven.multiModuleProjectDirectory=D:\\projects\\naming-server -Djansi.passthrough=true -Dmaven.home=C:\\Users\\USER\\.m2\\wrapper\\dists\\apache-maven-3.9.6-bin\\439sdfsg2nbdob9ciift5h5nse\\apache-maven-3.9.6 -Dclassworlds.conf=C:\\Users\\USER\\.m2\\wrapper\\dists\\apache-maven-3.9.6-bin\\439sdfsg2nbdob9ciift5h5nse\\apache-maven-3.9.6\\bin\\m2.conf &quot;-Dmaven.ext.class.path=C:\\Program Files (x86)\\JetBrains\\IntelliJ IDEA Community Edition 2022.3\\plugins\\maven\\lib\\maven-event-listener.jar&quot; &quot;-javaagent:C:\\Program Files (x86)\\JetBrains\\IntelliJ IDEA Community Edition 2022.3\\lib\\idea_rt.jar=8891:C:\\Program Files (x86)\\JetBrains\\IntelliJ IDEA Community Edition 2022.3\\bin&quot; -Dfile.encoding=UTF-8 -classpath C:\\Users\\USER\\.m2\\wrapper\\dists\\apache-maven-3.9.6-bin\\439sdfsg2nbdob9ciift5h5nse\\apache-maven-3.9.6\\boot\\plexus-classworlds-2.7.0.jar;C:\\Users\\USER\\.m2\\wrapper\\dists\\apache-maven-3.9.6-bin\\439sdfsg2nbdob9ciift5h5nse\\apache-maven-3.9.6\\boot\\plexus-classworlds.license org.codehaus.classworlds.Launcher -Didea.version=2022.3.3 clean install\n[INFO] Scanning for projects...\n[INFO] \n[INFO] ----------------------&lt; com.wizard:naming-server &gt;----------------------\n[INFO] Building naming-server 0.0.1-SNAPSHOT\n[INFO]   from pom.xml\n[INFO] --------------------------------[ jar ]---------------------------------\n[WARNING] The POM for net.sf:cb2xml:jar:0.90.2 is invalid, transitive dependencies (if any) will not be available, enable debug logging for more details\n[WARNING] The POM for net.sf:jrecord:jar:0.90.2 is invalid, transitive dependencies (if any) will not be available, enable debug logging for more details\n[WARNING] The POM for net.sf:coboltoxml:jar:0.90.2 is invalid, transitive dependencies (if any) will not be available, enable debug logging for more details\n[INFO] \n[INFO] --- clean:3.3.2:clean (default-clean) @ naming-server ---\n[INFO] Deleting D:\\projects\\naming-server\\target\n[INFO] \n[INFO] --- resources:3.3.1:resources (default-resources) @ naming-server ---\n[INFO] Copying 1 resource from src\\main\\resources to target\\classes\n[INFO] Copying 1 resource from src\\main\\resources to target\\classes\n[INFO] \n[INFO] --- compiler:3.11.0:compile (default-compile) @ naming-server ---\n[INFO] Changes detected - recompiling the module! :source\n[INFO] Compiling 1 source file with javac [debug release 17] to target\\classes\n[INFO] -------------------------------------------------------------\n[ERROR] COMPILATION ERROR : \n[INFO] -------------------------------------------------------------\n[ERROR] error reading C:\\Users\\USER\\.m2\\repository\\net\\sf\\cb2xml\\0.90.2\\cb2xml-0.90.2.jar; zip END header not found\n[ERROR] error reading C:\\Users\\USER\\.m2\\repository\\net\\sf\\jrecord\\0.90.2\\jrecord-0.90.2.jar; zip END header not found\n[ERROR] error reading C:\\Users\\USER\\.m2\\repository\\net\\sf\\coboltoxml\\0.90.2\\coboltoxml-0.90.2.jar; zip END header not found\n[ERROR] /D:/projects/naming-server/src/main/java/com/wizard/namingserver/NamingServerApplication.java:[1,1] cannot access com.wizard.namingserver\n  zip END header not found\n[INFO] 4 errors \n[INFO] -------------------------------------------------------------\n[INFO] ------------------------------------------------------------------------\n[INFO] BUILD FAILURE\n[INFO] ------------------------------------------------------------------------\n[INFO] Total time:  12.556 s\n[INFO] Finished at: 2025-12-01T01:09:09+05:30\n[INFO] ------------------------------------------------------------------------\n[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.11.0:compile (default-compile) on project naming-server: Compilation failure: Compilation failure: \n[ERROR] error reading C:\\Users\\USER\\.m2\\repository\\net\\sf\\cb2xml\\0.90.2\\cb2xml-0.90.2.jar; zip END header not found\n[ERROR] error reading C:\\Users\\USER\\.m2\\repository\\net\\sf\\jrecord\\0.90.2\\jrecord-0.90.2.jar; zip END header not found\n[ERROR] error reading C:\\Users\\USER\\.m2\\repository\\net\\sf\\coboltoxml\\0.90.2\\coboltoxml-0.90.2.jar; zip END header not found\n[ERROR] /D:/projects/naming-server/src/main/java/com/wizard/namingserver/NamingServerApplication.java:[1,1] cannot access com.wizard.namingserver\n[ERROR]   zip END header not found\n[ERROR] -&gt; [Help 1]\n[ERROR] \n[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.\n[ERROR] Re-run Maven using the -X switch to enable full debug logging.\n[ERROR] \n[ERROR] For more information about the errors and possible solutions, please read the following articles:\n[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException\n\nProcess finished with exit code 1\n\n</code></pre>\n<p>When i check my local repository, the jar seems to be broken as the size is of 18 KB, whereas if i happen to use the download the jar directly from SourceForge. It is way over 200 KB. What went wrong here?</p>\n<p><a href=\"https://i.sstatic.net/ykU7nv0w.png\" rel=\"nofollow noreferrer\"><img src=\"https://i.sstatic.net/ykU7nv0w.png\" alt=\"current repository jar size\" /></a></p>\n<p><a href=\"https://i.sstatic.net/XW7nMgXc.png\" rel=\"nofollow noreferrer\"><img src=\"https://i.sstatic.net/XW7nMgXc.png\" alt=\"actual jar size\" /></a></p>\n<p>What i want to know is the reason for this issue &amp; how to resolve this so that i can use both the packages for my work?</p>\n"
  }, {
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    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79833905/translate-escaped-string-from-xml-file",
    "title" : "Translate escaped string from XML file",
    "body" : "<p>Let's assume I have the string &quot;F%c3%bcr%20alle&quot; in a xml file. It should translate to &quot;Für alle&quot;. I can do the unescaping with JavaScript:</p>\n<pre><code>let decoded = decodeURIComponent(&quot;F%c3%bcr%20alle&quot;);\n</code></pre>\n<p>And with C#:</p>\n<pre><code>var decoded = HttpUtility.UrlDecode(&quot;F%c3%bcr%20alle&quot;);\n</code></pre>\n<p>But what I need is <strong>Java on Android</strong>. I tried</p>\n<pre><code>String decoded = URLDecoder.decode(&quot;F%c3%bcr%20alle&quot;, StandardCharsets.UTF_8);\n</code></pre>\n<p>but the result is &quot;Für alle&quot;.</p>\n<p>Any ideas?</p>\n<p>Update: As user85421 pointed out this is not an issue of Java's URLDecoder.decode() but the real problem seems to be that Logcat doesn't output UTF-8 ... ? The debugger shows the expected value in the tooltip.</p>\n<p>Update: Someone requested an example xml ...</p>\n<pre><code>&lt;?xml version=&quot;1.0&quot;?&gt;\n&lt;d:multistatus xmlns:d=&quot;DAV:&quot; xmlns:s=&quot;http://sabredav.org/ns&quot; xmlns:oc=&quot;http://owncloud.org/ns&quot; xmlns:nc=&quot;http://nextcloud.org/ns&quot;&gt;\n&lt;d:response&gt;\n    &lt;d:href&gt;/next/remote.php/dav/files/xyz/F%c3%bcr%20alle/&lt;/d:href&gt;\n&lt;/d:response&gt;\n&lt;/d:multistatus&gt; \n</code></pre>\n"
  }, {
    "tags" : [ "java", "hibernate", "jpa", "mapping" ],
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      "link" : "https://stackoverflow.com/users/31969879/%d0%a1%d0%b5%d1%80%d0%b3%d0%b5%d0%b9-%d0%9f%d0%be%d1%82%d0%b0%d0%bf%d1%87%d1%83%d0%ba"
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    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79833859/mapping-an-entity-with-an-embedded-key",
    "title" : "Mapping an entity with an embedded key",
    "body" : "<p>There is a class with an <code>EmbeddedId</code>.</p>\n<pre><code>@Entity\n@Getter\n@Setter\n@Table(name = &quot;indicator_values&quot;)\npublic class IndicatorValue {\n\n    @EmbeddedId\n    public IndicatorValueId id;\n\n    @Column(name = &quot;value&quot;)\n    public BigDecimal value;\n\n    public IndicatorValue() {}\n\n    public IndicatorValue(\n        IndicatorValueId id,\n        BigDecimal value\n    ) {\n        this.id = id;\n        this.value = value;\n    }\n\n    // Constructor used for experimentation (invoked in the repository)\n    public IndicatorValue(\n        String categoryCode,\n        String indicatorCode,\n        BigDecimal value,\n        LocalDate effectiveDate\n    ) {\n        this.value = value;\n        this.id = new IndicatorValueId(categoryCode, indicatorCode, effectiveDate);\n    }\n\n}\n</code></pre>\n<p>Alongside it, there is an <code>@Embeddable</code> class that defines this ID.</p>\n<pre><code>@Embeddable\n@AllArgsConstructor\n@NoArgsConstructor\n@EqualsAndHashCode\n@Getter\n@Setter\npublic class IndicatorValueId implements Serializable {\n    @Column(name = &quot;category_code&quot;)\n    private String categoryCode;\n    @Column(name = &quot;indicator_code&quot;)\n    private String indicatorCode;\n    @Column(name = &quot;effective_date&quot;)\n    private LocalDate effectiveDate;\n}\n</code></pre>\n<p>And there is a repository (I’ve tried different methods to verify the result—this is not the complete list).</p>\n<pre><code>public interface IndicatorValueRepository extends JpaRepository&lt;IndicatorValue, IndicatorValueId&gt; {\n\n    @Query(&quot;&quot;&quot;\n    SELECT iv\n    FROM IndicatorValue iv\n    WHERE iv.id.indicatorCode = :indicatorCode\n      AND iv.id.effectiveDate &lt; :effectiveDate\n    ORDER BY iv.id.effectiveDate DESC\n    &quot;&quot;&quot;)\n    List&lt;IndicatorValue&gt; findByIndicatorCodeBeforeDate(\n            @Param(&quot;indicatorCode&quot;) String indicatorCode,\n            @Param(&quot;effectiveDate&quot;) LocalDate effectiveDate\n    );\n\n    @Query(&quot;&quot;&quot;\n    SELECT NEW by.vezhlivec.normsservice.entity.IndicatorValue(\n      iv.id.categoryCode,\n      iv.id.indicatorCode,\n      iv.value,\n      iv.id.effectiveDate\n      )\n    FROM IndicatorValue iv\n    WHERE iv.id.indicatorCode = :indicatorCode\n      AND iv.id.categoryCode IS NULL\n      AND iv.id.effectiveDate &lt; :effectiveDate\n    ORDER BY iv.id.effectiveDate DESC\n    &quot;&quot;&quot;)\n    List&lt;IndicatorValue&gt; findByIndicatorCodeBeforeDate1(\n            @Param(&quot;indicatorCode&quot;) String indicatorCode,\n            @Param(&quot;effectiveDate&quot;) LocalDate effectiveDate\n    );\n\n    List&lt;IndicatorValue&gt; findByIdIndicatorCode(String indicatorCode);\n\n    List&lt;IndicatorValue&gt; findByValue(BigDecimal value);\n}\n</code></pre>\n<p>The core issue is that data is retrieved correctly <strong>only</strong> when I select a specific field, use a native query, or perform mapping via a constructor (as in <code>findByIndicatorCodeBeforeDate1</code>).</p>\n<p>In all other cases—when attempting to fetch the entity or a list of entities—I either get <code>null</code> or a <code>List</code> with the correct number of elements, but every element is <code>null</code>.</p>\n<p>Even the standard <code>findById()</code> returns <code>null</code>, despite the record definitely existing in the database.</p>\n<p>Here is a test snippet from the service</p>\n<pre><code>        List&lt;IndicatorValue&gt; iv = indicatorValueRepository.findByIdIndicatorCode(&quot;worker_4th_grade_hour_rate_construction&quot;);\n        System.out.println(iv);\n        List&lt;IndicatorValue&gt; v = indicatorValueRepository.findByValue(new BigDecimal(&quot;13.02&quot;));\n        System.out.println(v);\n\n        List&lt;IndicatorValue&gt; iv1 = indicatorValueRepository\n                .findByIndicatorCodeBeforeDate(&quot;worker_4th_grade_hour_rate_construction&quot;, period.atDay(1));\n        System.out.println(iv1);\n\n        List&lt;IndicatorValue&gt; iv2 = indicatorValueRepository\n                .findByIndicatorCodeBeforeDate1(&quot;worker_4th_grade_hour_rate_construction&quot;, period.atDay(1));\n        for (IndicatorValue iv3 : iv2) {\n            log.debug(&quot;Код категории: {}, код индикатора: {}, значение: {}, дата: {}&quot;,\n                    iv3.getId().getCategoryCode(),\n                    iv3.getId().getIndicatorCode(),\n                    iv3.getValue(),\n                    iv3.getId().getEffectiveDate());\n        }\n\n        Optional&lt;IndicatorValue&gt; iv4 = indicatorValueRepository\n                .findById(new IndicatorValueId(\n                        null,\n                        &quot;worker_4th_grade_hour_rate_construction&quot;,\n                        LocalDate.of(2025, 9, 1)\n                        )\n                );\n        System.out.println(iv4.orElse(null));\n</code></pre>\n<p>and the corresponding log output.</p>\n<pre><code>2025-11-28T22:28:44.318+03:00 DEBUG 414781 --- [nio-8080-exec-2] org.hibernate.SQL                        : \n    select\n        iv1_0.category_code,\n        iv1_0.effective_date,\n        iv1_0.indicator_code,\n        iv1_0.value \n    from\n        indicator_values iv1_0 \n    where\n        iv1_0.indicator_code=?\n2025-11-28T22:28:44.323+03:00 TRACE 414781 --- [nio-8080-exec-2] org.hibernate.orm.jdbc.extract           : extracted value (1:VARCHAR) -&gt; [null]\n2025-11-28T22:28:44.324+03:00 TRACE 414781 --- [nio-8080-exec-2] org.hibernate.orm.jdbc.extract           : extracted value (1:VARCHAR) -&gt; [null]\n2025-11-28T22:28:44.324+03:00 TRACE 414781 --- [nio-8080-exec-2] org.hibernate.orm.jdbc.extract           : extracted value (1:VARCHAR) -&gt; [null]\n[null, null, null]\n2025-11-28T22:28:44.326+03:00 DEBUG 414781 --- [nio-8080-exec-2] org.hibernate.SQL                        : \n    select\n        iv1_0.category_code,\n        iv1_0.effective_date,\n        iv1_0.indicator_code,\n        iv1_0.value \n    from\n        indicator_values iv1_0 \n    where\n        iv1_0.value=?\n2025-11-28T22:28:44.327+03:00 TRACE 414781 --- [nio-8080-exec-2] org.hibernate.orm.jdbc.extract           : extracted value (1:VARCHAR) -&gt; [null]\n2025-11-28T22:28:44.327+03:00 TRACE 414781 --- [nio-8080-exec-2] org.hibernate.orm.jdbc.extract           : extracted value (1:VARCHAR) -&gt; [null]\n2025-11-28T22:28:44.327+03:00 TRACE 414781 --- [nio-8080-exec-2] org.hibernate.orm.jdbc.extract           : extracted value (1:VARCHAR) -&gt; [null]\n2025-11-28T22:28:44.327+03:00 TRACE 414781 --- [nio-8080-exec-2] org.hibernate.orm.jdbc.extract           : extracted value (1:VARCHAR) -&gt; [null]\n2025-11-28T22:28:44.327+03:00 TRACE 414781 --- [nio-8080-exec-2] org.hibernate.orm.jdbc.extract           : extracted value (1:VARCHAR) -&gt; [null]\n[null, null, null, null, null]\n2025-11-28T22:28:44.330+03:00 DEBUG 414781 --- [nio-8080-exec-2] org.hibernate.SQL                        : \n    select\n        iv1_0.category_code,\n        iv1_0.effective_date,\n        iv1_0.indicator_code,\n        iv1_0.value \n    from\n        indicator_values iv1_0 \n    where\n        iv1_0.indicator_code=? \n        and iv1_0.effective_date&lt;? \n    order by\n        iv1_0.effective_date desc\n2025-11-28T22:28:44.331+03:00 TRACE 414781 --- [nio-8080-exec-2] org.hibernate.orm.jdbc.extract           : extracted value (1:VARCHAR) -&gt; [null]\n[null]\n2025-11-28T22:28:44.333+03:00 DEBUG 414781 --- [nio-8080-exec-2] org.hibernate.SQL                        : \n    select\n        iv1_0.category_code,\n        iv1_0.indicator_code,\n        iv1_0.value,\n        iv1_0.effective_date \n    from\n        indicator_values iv1_0 \n    where\n        iv1_0.indicator_code=? \n        and iv1_0.category_code is null \n        and iv1_0.effective_date&lt;? \n    order by\n        iv1_0.effective_date desc\n2025-11-28T22:28:44.334+03:00 TRACE 414781 --- [nio-8080-exec-2] org.hibernate.orm.jdbc.extract           : extracted value (1:VARCHAR) -&gt; [null]\n2025-11-28T22:28:44.334+03:00 TRACE 414781 --- [nio-8080-exec-2] org.hibernate.orm.jdbc.extract           : extracted value (2:VARCHAR) -&gt; [worker_4th_grade_hour_rate_construction]\n2025-11-28T22:28:44.334+03:00 TRACE 414781 --- [nio-8080-exec-2] org.hibernate.orm.jdbc.extract           : extracted value (3:NUMERIC) -&gt; [13.02]\n2025-11-28T22:28:44.334+03:00 TRACE 414781 --- [nio-8080-exec-2] org.hibernate.orm.jdbc.extract           : extracted value (4:DATE) -&gt; [2024-09-01]\n2025-11-28T22:28:44.335+03:00 DEBUG 414781 --- [nio-8080-exec-2] b.v.n.s.i.u.IndicatorsUpdateService      : Код категории: null, код индикатора: worker_4th_grade_hour_rate_construction, значение: 13.02, дата: 2024-09-01\n2025-11-28T22:28:44.350+03:00 DEBUG 414781 --- [nio-8080-exec-2] org.hibernate.SQL                        : \n    select\n        iv1_0.category_code,\n        iv1_0.effective_date,\n        iv1_0.indicator_code,\n        iv1_0.value \n    from\n        indicator_values iv1_0 \n    where\n        (\n            iv1_0.category_code, iv1_0.effective_date, iv1_0.indicator_code\n        ) in ((?, ?, ?))\nnull\n</code></pre>\n"
  }, {
    "tags" : [ "java", "javafx" ],
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      "display_name" : "SilverCube",
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    "question_id" : 79833829,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79833829/can-javafx-webview-show-webp-images",
    "title" : "Can JavaFX WebView show webp images?",
    "body" : "<p>I use JavaFX 26-ea+6 on Ubuntu 20.04 and it seems that WebView can't show webp images. This is my code:</p>\n<pre><code>public class TestFx extends Application {\n\n    @Override\n    public void start(Stage primaryStage) {\n        WebView webView = new WebView();\n        webView.getEngine().load(&quot;https://www.bbc.com&quot;);\n\n        Scene scene = new Scene(webView, 800, 600);\n        primaryStage.setTitle(&quot;BBC Browser&quot;);\n        primaryStage.setScene(scene);\n        primaryStage.show();\n    }\n\n    public static void main(String[] args) {\n        launch(args);\n    }\n}\n</code></pre>\n<p>And this is the result:</p>\n<p><a href=\"https://i.sstatic.net/BHR10h4z.png\" rel=\"noreferrer\"><img src=\"https://i.sstatic.net/BHR10h4z.png\" alt=\"enter image description here\" /></a></p>\n<p><br>but generally images are shown as expected, for example youtube:<br></p>\n<p><a href=\"https://i.sstatic.net/2fEs0opM.png\" rel=\"noreferrer\"><img src=\"https://i.sstatic.net/2fEs0opM.png\" alt=\"enter image description here\" /></a></p>\n<p>Is this a bug or WebView can't show webp images?</p>\n"
  }, {
    "tags" : [ "java", "android", "google-cloud-firestore" ],
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    "question_id" : 79833790,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79833790/firestore-only-updates-when-accessed-through-a-specific-android-activity",
    "title" : "Firestore only updates when accessed through a specific Android activity",
    "body" : "<p>I'm working on an Android app where users can add and remove restaurants from their favourites via the RestaurantPage activity. When I access the RestaurantPage activity from the UserFavourites activity and attempt to remove the restaurant from my favourites, Firestore successfully updates, removing the restaurant from my favourites in the database. However, when I access a restaurant via the Search activity, I cannot remove the restaurant from my favourites (Firestore isn't updated when the favourite button is clicked). Here is the code for my RestaurantPage activity, UserFavourites activity, Search activity and AppManager class. I'm new to Android developing so any help would be much appreciated!</p>\n<p>RestaurantPage:</p>\n<pre><code>\n\nimport android.content.Intent;\nimport android.net.Uri;\nimport android.os.Bundle;\nimport android.util.Log;\nimport android.widget.Button;\n\nimport java.util.ArrayList;\n\n\npublic class RestaurantPage extends AppCompatActivity {\n\n    Button favourited;\n    \n    \n    \n\n   \n\n    @Override\n    protected void onCreate(Bundle savedInstanceState) {\n        super.onCreate(savedInstanceState);\n        EdgeToEdge.enable(this);\n        setContentView(R.layout.menu_restaurantpage);\n        favourited = findViewById(R.id.favouriteButton);\n\n        Restaurant currRestaurant = AppManager.getCurrentRestaurant();\n        \n        ArrayList&lt;Restaurant&gt; currFavourites = AppManager.getCurrentUser().getFavourites();\n        Log.d(&quot;CURR USER&quot;, AppManager.getCurrentUser().getUsername());\n\n        int i = 0;\n        boolean flag = false;\n        while (i &lt; currFavourites.size() &amp;&amp; !flag){\n            if (currFavourites.get(i).getName().equals(currRestaurant.getName())){\n                flag = true;\n            }\n            i++;\n        }\n\n        if (flag) {\n            favourited.setText(&quot;Remove from favourites&quot;);\n        }\n        else {\n            favourited.setText(&quot;Add to favourites&quot;);\n        }\n\n\n\n        favourited.setOnClickListener((view) -&gt; {\n            ArrayList&lt;Restaurant&gt; currentFavourites = AppManager.getCurrentUser().getFavourites();\n            int j = 0;\n            boolean flag2 = false;\n            while (j &lt; currentFavourites.size() &amp;&amp; !flag2) {\n                if (currentFavourites.get(j).getName().equals(currRestaurant.getName())) {\n                    flag2 = true;\n                }\n                j++;\n            }\n\n            if (flag2) {\n                AppManager.getCurrentUser().removeFavourite(currRestaurant);\n                favourited.setText(&quot;Add to favourites&quot;);\n            }\n            else {\n                AppManager.getCurrentUser().addFavourite(currRestaurant);\n                favourited.setText(&quot;Remove from favourites&quot;);\n            }\n            AppManager.uploadUser(AppManager.getCurrentUser());\n        });\n\n        \n\n\n     \n    }\n\n\n}\n</code></pre>\n<p>UserFavourites:</p>\n<pre><code>\n\n\npublic class UserFavourites extends AppCompatActivity implements AdapterView.OnItemSelectedListener {\n\n    private FirebaseAuth authenticate;\n    private ArrayList&lt;User&gt; userList;\n\n    private User currentUser;\n\n    private SearchView favouritesBar;\n\n    private RecyclerView favouritesRecyclerView;\n\n    private SearchAdapter searchAdapter;\n\n\n    @Override\n    protected void onCreate(Bundle savedInstanceState) {\n        super.onCreate(savedInstanceState);\n        EdgeToEdge.enable(this);\n        setContentView(R.layout.menu_favourites);\n        authenticate = FirebaseAuth.getInstance();\n\n       \n\n        favouritesRecyclerView = findViewById(R.id.favourites_list);\n\n        favouritesRecyclerView.setItemAnimator(new DefaultItemAnimator());\n        favouritesRecyclerView.addItemDecoration(new DividerItemDecoration(this, LinearLayoutManager.VERTICAL));\n        currentUser = AppManager.getCurrentUser();\n        if (currentUser == null){\n            Log.d( &quot;USER FAIL&quot;, &quot;No user found&quot;);\n            startActivity(new Intent(UserFavourites.this, HomeScreen.class));\n            return;\n        }\n        else {\n            Log.d(&quot;USER FOUND&quot;, &quot;User found&quot;);\n        }\n\n        searchAdapter = new SearchAdapter(currentUser.getFavourites(), UserFavourites.this, new SearchAdapter.ItemClickListener() {\n            @Override\n            public void onItemClick(Restaurant restaurant) {\n                Log.d(&quot;NEWPAGE&quot;, &quot;User sent to restaurant page for &quot; + restaurant.getName());\n                AppManager.setCurrentRestaurant(restaurant);\n                startActivity(new Intent(UserFavourites.this, RestaurantPage.class));\n            }\n        });\n\n\n    }\n\n    \n\n\n}\n</code></pre>\n<p>Search:</p>\n<pre><code>public class Search extends AppCompatActivity implements AdapterView.OnItemSelectedListener {\n\n    protected ArrayList&lt;Restaurant&gt; searchList;\n    protected RecyclerView searchRecyclerView;\n    SearchAdapter searchAdapter;\n\n   \n\n    private DrawerLayout nav_layout;\n    private Toolbar nav_toolbar;\n\n    private NavigationView nav_view;\n\n    private ArrayList&lt;User&gt; userList;\n\n    private User currentUser;\n\n    private FirebaseAuth authenticate;\n\n\n\n    @Override\n    protected void onCreate(Bundle savedInstanceState) {\n        super.onCreate(savedInstanceState);\n        EdgeToEdge.enable(this);\n        setContentView(R.layout.menu_searchpage);\n        nav_layout = findViewById(R.id.nav_layout);\n        nav_toolbar = findViewById(R.id.nav_toolbar);\n        nav_view = findViewById(R.id.navigationView);\n        nav_view.setItemIconTintList(null);\n\n        searchRecyclerView = findViewById(R.id.search_list);\n        searchRecyclerView.setItemAnimator(new DefaultItemAnimator());\n        searchRecyclerView.addItemDecoration(new DividerItemDecoration(this, LinearLayoutManager.VERTICAL));\n        searchList = AppManager.getRestaurants();\n        authenticate = FirebaseAuth.getInstance();\n        currentUser = AppManager.getCurrentUser();\n        if (currentUser == null){\n            Log.d( &quot;USER FAIL&quot;, &quot;No user found&quot;);\n            startActivity(new Intent(Search.this, HomeScreen.class));\n            return;\n        }\n        else {\n            Log.d(&quot;USER FOUND&quot;, &quot;User found&quot;);\n            \n        }\n\n\n        searchAdapter = new SearchAdapter(searchList, Search.this, new SearchAdapter.ItemClickListener() {\n            @Override\n            public void onItemClick(Restaurant restaurant) {\n                Log.d(&quot;NEWPAGE&quot;, &quot;User sent to restaurant page for &quot; + restaurant.getName());\n                AppManager.setCurrentRestaurant(restaurant);\n                startActivity(new Intent(Search.this, RestaurantPage.class));\n\n            }\n        });\n\n       \n    }\n\n}\n</code></pre>\n<p>AppManager:</p>\n<pre><code>\n\npublic class AppManager {\n\n    private static int numOfRestaurants;\n    private static FirebaseFirestore db = FirebaseFirestore.getInstance();\n    private static ArrayList&lt;User&gt; users = new ArrayList&lt;User&gt;();\n    protected static ArrayList&lt;Restaurant&gt; restaurants = new ArrayList&lt;Restaurant&gt;();\n\n    private static Restaurant currentRestaurant;\n    private static User currentUser;\n\n\n\n\n    public static ArrayList&lt;User&gt; getUsersImmediately(){\n        return users;\n    }\n    public static ArrayList&lt;User&gt; getUsers(){\n        users.clear();\n        db.collection(&quot;users&quot;).get()\n                .addOnCompleteListener((task) -&gt; {\n                    if (task.isSuccessful()) {\n                        for (QueryDocumentSnapshot document : task.getResult()) {\n                            users.add(document.toObject(User.class));\n                            Log.d(&quot;USER ADD&quot;, &quot;Added user to user list&quot;);\n\n                        }\n                        Log.d(&quot;DOWNLOAD DB&quot;, &quot;Successfully obtained users&quot;);\n\n                    }\n                })\n                .addOnFailureListener((task) -&gt; {\n                    Log.d(&quot;DOWNLOAD DB&quot;, &quot;Failed to obtain users&quot;);\n                });\n\n        return users;\n    }\n\n\n\n\n    public static void downloadRestaurants(){\n\n        restaurants.clear();\n        db.collection(&quot;restaurants&quot;).get()\n                .addOnCompleteListener((task) -&gt; {\n                    if (task.isSuccessful()) {\n                        for (QueryDocumentSnapshot document : task.getResult()) {\n                            restaurants.add(document.toObject(Restaurant.class));\n                            Log.d(&quot;RESTAURANT ADD&quot;, &quot;Added restaurant to restaurant list&quot;);\n\n                        }\n                        Log.d(&quot;DOWNLOAD DB&quot;, &quot;Successfully downloaded restaurants&quot;);\n\n                    }\n                })\n                .addOnFailureListener((task) -&gt; {\n                    Log.d(&quot;DOWNLOAD DB&quot;, &quot;Failed to download restaurants&quot;);\n                });\n\n\n    }\n\n\n    public static void downloadUsers(){\n\n        users.clear();\n        db.collection(&quot;users&quot;).get()\n                .addOnCompleteListener((task) -&gt; {\n                    if (task.isSuccessful()) {\n                        for (QueryDocumentSnapshot document : task.getResult()) {\n                            users.add(document.toObject(User.class));\n                            Log.d(&quot;USER ADD&quot;, &quot;Added user to user list&quot;);\n\n                        }\n                        Log.d(&quot;DOWNLOAD DB&quot;, &quot;Successfully downloaded users&quot;);\n\n                    }\n                })\n                .addOnFailureListener((task) -&gt; {\n                    Log.d(&quot;DOWNLOAD DB&quot;, &quot;Failed to download users&quot;);\n                });\n\n\n    }\n\n    public static void uploadUser(User user){\n        db.collection(&quot;users&quot;).document(user.getUsername())\n                .set(user)\n                .addOnSuccessListener((task) -&gt; {\n                    Log.d(&quot;UPLOAD DB&quot;, &quot;User &quot; + user.getUsername() + &quot; uploaded to database&quot;);\n                })\n                .addOnFailureListener((task) -&gt;{\n                    Log.d(&quot;UPLOAD DB&quot;, &quot;User could not be uploaded&quot;);\n\n                });\n    }\n\n    public static void uploadRestaurant(Restaurant restaurant){\n        db.collection(&quot;restaurants&quot;).document(restaurant.getName())\n                .set(restaurant)\n                .addOnSuccessListener((task) -&gt; {\n                    Log.d(&quot;UPLOAD DB&quot;, &quot;Restaurant &quot; + restaurant.getName() + &quot; uploaded to database&quot;);\n                })\n                .addOnFailureListener((task) -&gt;{\n                    Log.d(&quot;UPLOAD DB&quot;, &quot;Restaurant could not be uploaded&quot;);\n\n                });\n    }\n\n\n    public static ArrayList&lt;Restaurant&gt; getRestaurants(){\n        restaurants.clear();\n        db.collection(&quot;restaurants&quot;).get()\n                .addOnCompleteListener((task) -&gt; {\n                    if (task.isSuccessful()) {\n                        for (QueryDocumentSnapshot document : task.getResult()) {\n                            restaurants.add(document.toObject(Restaurant.class));\n                            Log.d(&quot;RESTAURANT ADD&quot;, &quot;Added restaurant to restaurant list&quot;);\n\n                        }\n                        Log.d(&quot;DOWNLOAD DB&quot;, &quot;Successfully obtained restaurants&quot;);\n\n                    }\n                })\n                .addOnFailureListener((task) -&gt; {\n                    Log.d(&quot;DOWNLOAD DB&quot;, &quot;Failed to obtain restaurants&quot;);\n                });\n\n        return restaurants;\n    }\n\n\n    \n\n\n    \n\n\n\n    public static Restaurant getRestaurant(int i){\n        return restaurants.get(i);\n    }\n\n\n\n    public static Restaurant getCurrentRestaurant() {\n        return currentRestaurant;\n    }\n\n    public static void setCurrentRestaurant(Restaurant newCurrent) {\n        currentRestaurant = newCurrent;\n    }\n\n    public static User getCurrentUser() {\n        return currentUser;\n    }\n\n    public static void setCurrentUser(User currentUser) {\n        AppManager.currentUser = currentUser;\n    }\n\n}\n\n</code></pre>\n"
  }, {
    "tags" : [ "java", "websocket", "twilio", "twilio-twiml" ],
    "owner" : {
      "account_id" : 185100,
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      "profile_image" : "https://www.gravatar.com/avatar/3eced70cd3418b88f0fe9c101048e4ea?s=256&d=identicon&r=PG",
      "display_name" : "vorburger",
      "link" : "https://stackoverflow.com/users/421602/vorburger"
    },
    "is_answered" : false,
    "view_count" : 42,
    "answer_count" : 1,
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    "last_activity_date" : 1764501760,
    "creation_date" : 1764468418,
    "last_edit_date" : 1764469400,
    "question_id" : 79833634,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79833634/twilio-signature-validation-for-conversationrelay-websocket-with-java-sdk",
    "title" : "Twilio Signature validation for ConversationRelay WebSocket with Java SDK",
    "body" : "<p>In <a href=\"https://github.com/enola-dev/enola/pull/1927\" rel=\"nofollow noreferrer\">https://github.com/enola-dev/enola/pull/1927</a> I attempted to add signature validation   for WebSocket authentication security to my <a href=\"https://github.com/enola-dev/twilio-conversation-relay-java\" rel=\"nofollow noreferrer\">https://github.com/enola-dev/twilio-conversation-relay-java</a> Java Client Library SDK for Twilio's ConversationRelay, with a WebSocket server.</p>\n<p>This isn't quite working yet, and the initial reason is likely that I didn't pass a valid full URL, as the AI code review feedback on the aforementioned PR claims. In <a href=\"https://github.com/enola-dev/enola/pull/1928/files\" rel=\"nofollow noreferrer\">https://github.com/enola-dev/enola/pull/1928/files</a> I've attempted to fix this, but it still does not work, and running <code>bazelisk run //java/dev/enola/audio/voice/twilio/relay/websocket:echo</code> in my project fails with: <em>&quot;Invalid Twilio signature: U3NY5SLOn+V8iDNzzVeLD8J4t+k= for wss://4ea9be067e20.ngrok-free.app/&quot;</em> My code ultimately basically just does:</p>\n<pre class=\"lang-java prettyprint-override\"><code>new RequestValidator(&quot;c...c&quot;)\n  .validate(&quot;https://4ea9be067e20.ngrok-free.app/&quot;,\n            Map.of(),\n            &quot;U3NY5SLOn+V8iDNzzVeLD8J4t+k=&quot;);\n</code></pre>\n<p>What am I missing and doing wrong? It's not very clear to me if, in the case of validating the signature in the <code>onOpen()</code> method of a <code>WebSocketServer</code>, where (IMHO, AFAIK) there are no &quot;parameters&quot; or &quot;body&quot;, one shold use the <code>RequestValidator</code>'s <code>boolean validate(String url, Map&lt;String, String&gt; params, String expectedSignature)</code> or <code>boolean validate(String url, String body, String expectedSignature)</code> method - but I've tried both, with either an empty <code>Map.of()</code> or an empty <code>&quot;&quot;</code> String, and neither worked.</p>\n<p>PS: Also <a href=\"https://help.twilio.com/tickets/24297613\" rel=\"nofollow noreferrer\">https://help.twilio.com/tickets/24297613</a>.</p>\n"
  }, {
    "tags" : [ "java" ],
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      "profile_image" : "https://i.sstatic.net/YeMQP.jpg?s=256",
      "display_name" : "DaBlick",
      "link" : "https://stackoverflow.com/users/979145/dablick"
    },
    "is_answered" : true,
    "view_count" : 114,
    "answer_count" : 5,
    "score" : 0,
    "last_activity_date" : 1764716665,
    "creation_date" : 1764460768,
    "question_id" : 79833607,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79833607/looking-for-workaround-for-library-with-missing-interface",
    "title" : "Looking for workaround for library with missing interface",
    "body" : "<p>I have a Java library (FIHR) where there are conventions in a bean class hierarchy that were NOT formalized as an interface.</p>\n<p>For example many subclasses have a <code>getStatus()</code> property  but there is no interface that formalizes that in a way that allows for me to share code as follows:</p>\n<pre><code>if (bean instanceof HasStatusProperty bean2) {\n    System.out.println(&quot;Status for this bean: &quot; + bean2.getStatus();\n    }\n</code></pre>\n<p>Can anyone think of a way to sortof project such an interface on a class that comes from a library.</p>\n<p>The best I can think of is to use the Reflection API to test if it has that property  and get the value.  But that's cumbersome.</p>\n"
  }, {
    "tags" : [ "java", "concurrency", "deadlock", "forkjoinpool", "recursivetask" ],
    "owner" : {
      "account_id" : 11193622,
      "reputation" : 65,
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      "profile_image" : "https://www.gravatar.com/avatar/e638e2a85ee54fa0ad149e284186eba0?s=256&d=identicon&r=PG&f=y&so-version=2",
      "display_name" : "Piotr Walkusz",
      "link" : "https://stackoverflow.com/users/8213093/piotr-walkusz"
    },
    "is_answered" : true,
    "view_count" : 91,
    "answer_count" : 1,
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    "last_activity_date" : 1764513504,
    "creation_date" : 1764456544,
    "question_id" : 79833584,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79833584/forkjoinpool-and-recursivetask-lead-to-deadlock-when-join-is-called-in-a-differe",
    "title" : "ForkJoinPool and RecursiveTask lead to deadlock when join is called in a different thread than fork",
    "body" : "<p>The program below never ends:</p>\n<pre><code>void main() {\n    try (Fibonacci fibonacci = new Fibonacci()) {\n        IO.println(fibonacci.calculate(9));\n    }\n}\n\npublic static class Fibonacci implements AutoCloseable {\n\n    private final ConcurrentHashMap&lt;Integer, FibonacciTask&gt; cache;\n    private final ForkJoinPool pool;\n\n    public Fibonacci() {\n        cache = new ConcurrentHashMap&lt;&gt;();\n        pool = new ForkJoinPool(2);\n    }\n\n    public long calculate(int n) {\n        return pool.invoke(new FibonacciTask(n));\n    }\n\n    private class FibonacciTask extends RecursiveTask&lt;Long&gt; {\n\n        private final int n;\n\n        private FibonacciTask(int n) {\n            this.n = n;\n        }\n\n        @Override\n        protected Long compute() {\n            IO.println(&quot;[%d] Start&quot;.formatted(n));\n            if (n &lt; 3) {\n                IO.println(&quot;[%d] End&quot;.formatted(n));\n                return 1L;\n            }\n\n            FibonacciTask previousValue = cache.putIfAbsent(n, this);\n            if (previousValue != null) {\n                IO.println(&quot;[%d] Wait&quot;.formatted(n));\n                long cachedValue = previousValue.join(); // &lt;-- PROBLEMATIC LINE\n                IO.println(&quot;[%d] Got value&quot;.formatted(n));\n\n                return cachedValue;\n            }\n\n            FibonacciTask a = new FibonacciTask(n - 2);\n            FibonacciTask b = new FibonacciTask(n - 1);\n            a.fork();\n            b.fork();\n\n            long value = a.join() + b.join();\n\n            IO.println(&quot;[%d] End&quot;.formatted(n));\n\n            return value;\n        }\n    }\n\n    @Override\n    public void close() {\n        if (pool != null) {\n            pool.close();\n        }\n    }\n}\n</code></pre>\n<p>Here is example log:</p>\n<pre><code>[9] Start\n[7] Start\n[8] Start\n[5] Start\n[6] Start\n[3] Start\n[4] Start\n[2] Start\n[1] Start\n[2] End\n[1] End\n[3] Start\n[2] Start\n[3] Wait\n[2] End\n[3] End\n[4] Start\n[3] Got value\n[4] Wait\n[4] End\n[7] Start\n[5] Start\n[7] Wait\n[5] Wait\n[6] Start\n[6] Wait\n</code></pre>\n<p>The problematic line is here:</p>\n<pre><code>long cachedValue = previousValue.join(); // &lt;-- PROBLEMATIC LINE\n</code></pre>\n<p>In my logs you can see:</p>\n<pre><code>...\n[4] Start\n...\n[4] Wait\n[4] End\n...\n</code></pre>\n<p>but there is no <code>[4] Got value</code>. It means that <code>FibonacciTask(4)</code> was calculated but this line:</p>\n<pre><code>long cachedValue = previousValue.join(); // &lt;-- PROBLEMATIC LINE\n</code></pre>\n<p>is still waiting.</p>\n<p>If I change line:</p>\n<pre><code>pool = new ForkJoinPool(2);\n</code></pre>\n<p>to:</p>\n<pre><code>pool = new ForkJoinPool(1);\n</code></pre>\n<p>the deadlock disappears.</p>\n<p>My only clue is that I shouldn't call <code>join</code> in different thread than <code>fork</code>, but I didn't see in the documentation that this is forbidden.</p>\n"
  }, {
    "tags" : [ "java", "ui-automation", "jline" ],
    "owner" : {
      "account_id" : 37604239,
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      "display_name" : "Lucy",
      "link" : "https://stackoverflow.com/users/28332552/lucy"
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    "view_count" : 52,
    "accepted_answer_id" : 79833568,
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    "last_activity_date" : 1764453894,
    "creation_date" : 1764446740,
    "question_id" : 79833498,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79833498/is-there-a-way-to-automate-user-input-with-jlines-linereader",
    "title" : "Is there a way to automate user input with JLine&#39;s LineReader?",
    "body" : "<p>When handling user input through <code>Scanner(System.in)</code>, you can use <code>System.setIn()</code> to automate user input.</p>\n<p>Like this:</p>\n<pre class=\"lang-java prettyprint-override\"><code>package edu.ntnu.idi.idat;\n\nimport java.io.ByteArrayInputStream;\nimport java.io.InputStream;\nimport java.util.Scanner;\n\npublic final class TestCode {\n    private TestCode() { }\n    /**\n     * Test code.\n     * @param args\n     */\n    public static void main(\n        final String[] args\n    ) {\n        InputStream input = System.in;\n        String testInputString = &quot;test&quot; + System.lineSeparator() + &quot;test2&quot;;\n        ByteArrayInputStream testInput\n            = new ByteArrayInputStream(testInputString.getBytes());\n\n        System.setIn(testInput);\n\n        Scanner inputScanner = new Scanner(System.in);\n\n        System.out.println(inputScanner.nextLine());\n        System.out.println(inputScanner.nextLine());\n\n        inputScanner.close()\n    }\n}\n</code></pre>\n<p>But when trying the same method for JLine's LineReader, it doesn't work:</p>\n<pre><code>package edu.ntnu.idi.idat;\n\nimport java.io.ByteArrayInputStream;\nimport java.io.IOException;\nimport java.io.InputStream;\n\nimport org.jline.reader.LineReader;\nimport org.jline.reader.LineReaderBuilder;\nimport org.jline.terminal.Terminal;\nimport org.jline.terminal.TerminalBuilder;\n\npublic final class TestCode {\n    private TestCode() { }\n    /**\n     * Test code.\n     * @param args\n     * @throws IOException\n     */\n    public static void main(\n        final String[] args\n    ) throws IOException {\n        InputStream input = System.in;\n        String testInputString = &quot;test&quot; + System.lineSeparator() + &quot;test2&quot;;\n        ByteArrayInputStream testInput\n            = new ByteArrayInputStream(testInputString.getBytes());\n\n        System.setIn(testInput);\n\n        Terminal terminal = TerminalBuilder.builder().build();\n        LineReader lineReader = LineReaderBuilder\n            .builder()\n            .terminal(terminal)\n            .build();\n\n        System.out.println(lineReader.readLine());\n        System.out.println(lineReader.readLine());\n\n        terminal.close()\n    }\n}\n\n</code></pre>\n<p>I believe this is because inputScanner uses System.in (as can be seen when constructing it), while LineReader doesn't seem to.</p>\n<p>My question is: is there a way to automate user input for LineReader as well?</p>\n"
  }, {
    "tags" : [ "java", "performance", "file-io", "bufferedwriter" ],
    "owner" : {
      "account_id" : 39996495,
      "reputation" : 17,
      "user_id" : 29557900,
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      "profile_image" : "https://i.sstatic.net/OlU9KX91.jpg?s=256",
      "display_name" : "Ahamed Shahif",
      "link" : "https://stackoverflow.com/users/29557900/ahamed-shahif"
    },
    "is_answered" : true,
    "view_count" : 128,
    "closed_date" : 1764527529,
    "answer_count" : 2,
    "score" : 0,
    "last_activity_date" : 1764655746,
    "creation_date" : 1764442257,
    "question_id" : 79833456,
    "link" : "https://stackoverflow.com/questions/79833456/how-to-efficiently-flush-and-write-large-amounts-of-data-to-a-file-using-buffere",
    "closed_reason" : "Needs more focus",
    "title" : "How to efficiently flush and write large amounts of data to a file using BufferedWriter in Java?",
    "body" : "<p>I'm working on a Java project where I need to write a large number of lines to a file. I know <code>BufferedWriter</code> can improve performance compared to writing character by character, but I am unsure about the best practices for <strong>flushing the buffer</strong> and <strong>ensuring all data is written correctly</strong>.</p>\n<p>Here’s my current code:</p>\n<pre><code>import java.io.BufferedWriter;\nimport java.io.FileWriter;\nimport java.io.IOException;\n\npublic class FileWriteExample {\n    public static void main(String[] args) {\n        try (BufferedWriter writer = new BufferedWriter(new FileWriter(&quot;output.txt&quot;))) {\n            for (int i = 0; i &lt; 100000; i++) {\n                writer.write(&quot;Line &quot; + i + &quot;\\n&quot;);\n            }\n            // Do I need to call writer.flush() here explicitly?\n        } catch (IOException e) {\n            e.printStackTrace();\n        }\n    }\n}\n</code></pre>\n<p><strong>Questions:</strong></p>\n<ol>\n<li><p>Is it necessary to call <code>writer.flush()</code> explicitly before closing the <code>BufferedWriter</code>?</p>\n</li>\n<li><p>Are there performance differences between calling <code>flush()</code> periodically inside the loop vs relying on <code>try-with-resources</code>?</p>\n</li>\n<li><p>What are the recommended best practices for writing large files efficiently in Java?</p>\n</li>\n</ol>\n"
  }, {
    "tags" : [ "java" ],
    "owner" : {
      "account_id" : 44847233,
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      "display_name" : "Anurag Singh",
      "link" : "https://stackoverflow.com/users/31966612/anurag-singh"
    },
    "is_answered" : false,
    "view_count" : 85,
    "closed_date" : 1764503881,
    "answer_count" : 0,
    "score" : -4,
    "last_activity_date" : 1764503857,
    "creation_date" : 1764432523,
    "last_edit_date" : 1764503857,
    "question_id" : 79833362,
    "link" : "https://stackoverflow.com/questions/79833362/getting-incorrect-output-in-my-java-solution-for-hackerrank-a-very-big-sum",
    "closed_reason" : "Not suitable for this site",
    "title" : "Getting incorrect output in my Java solution for HackerRank “A Very Big Sum”",
    "body" : "<p>I am trying to solve the <strong>&quot;A Very Big Sum&quot;</strong> problem on HackerRank using Java.   The task is to sum large integers (long values), but my output does not match the expected answer.</p>\n<p>Here is my code:</p>\n<pre class=\"lang-java prettyprint-override\"><code>import java.io.*;\nimport java.util.*;\n\npublic class Solution {\n    public static void main(String[] args) {\n        Scanner sc = new Scanner(System.in);\n        int n = sc.nextInt();\n        long sum = 0;\n\n        for (int i = 0; i &lt; n; i++) {\n            long val = sc.nextLong();\n            sum += val;\n        }\n\n        System.out.println(sum);\n    }\n}\n</code></pre>\n<h3>What I expected</h3>\n<p>The code should correctly sum all the long values and print the total.</p>\n<h3>What is happening instead</h3>\n<p>Even though I'm using <code>long</code>, the output for some test cases is still incorrect (either overflow-like wrong values or mismatched totals).</p>\n<h3>What I tried</h3>\n<ul>\n<li><p>Printing each value to confirm input</p>\n</li>\n<li><p>Replacing <code>int n</code> with <code>long n</code></p>\n</li>\n<li><p>Checking loop logic</p>\n</li>\n<li><p>Running sample test cases manually</p>\n</li>\n</ul>\n<h3>My question</h3>\n<p>Why is my solution giving incorrect results for some test cases, even though I'm using <code>long</code>? Is there something wrong with how I'm reading input or summing the values?</p>\n"
  }, {
    "tags" : [ "java", "android", "c", "linux" ],
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      "link" : "https://stackoverflow.com/users/26336155/stas-badzi"
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    "question_id" : 79833256,
    "link" : "https://stackoverflow.com/questions/79833256/is-it-possible-to-load-a-function-symbol-from-an-executable",
    "closed_reason" : "Duplicate",
    "title" : "Is it possible to load a function symbol from an executable",
    "body" : "<p>I have 2 files:</p>\n<p><code>foo.c</code>:</p>\n<pre><code>#include &lt;stdio.h&gt;\nint Main(int a) {\n    printf(&quot;A%dB&quot;,a);\n}\nint main() {\n    return Main(1);\n}\n</code></pre>\n<p><code>bar.c</code>:</p>\n<pre><code>extern int Main(int);\nint main() {\n   return Main(2);\n}\n</code></pre>\n<p>If I compile <code>foo.c</code> into an executable (<code>gcc -fPIC foo.c -o foo.out</code>) and run it, it correcty prints <code>A1B</code>.</p>\n<p>Same for compiling <code>foo.c</code> into a shared object file (<code>gcc -shared -fPIC foo.c -o libfoo.so</code>) and <code>bar.c</code> into an executable that loads <code>libfoo.so</code> (<code>gcc bar.c -L. -lfoo -o bar.out</code>) and run it, it correctly prints <code>A2B</code>.</p>\n<p>But if I try to (1) link <code>bar.out</code> with <code>foo.out</code> or (2) execute <code>libfoo.so</code> it (1) doesn't link (<code>/usr/bin/ld: cannot use executable file './libfoo .so' as input to a link</code>) or (2) crashes on startup with <code>Segmentation fault (core dumped)</code></p>\n<p>Is there a way to create a file that can be executed and is a valid shared object file at the same file, and if not, are there other ways to load the <code>a.out</code> executable (maybe some kind of a <code>dlopen</code> hack) from <code>b.out</code>  to run a function from <code>a.out</code></p>\n<p>I am also interested if there is a way to load the executable using java's <code>System.loadLibrary(&quot;native&quot;)</code>  (if possible, only changing the c side and not the java side)</p>\n<p>FYI, I want to do this, so I can have an android executable that can be run from something like termux while also being able to be loaded from <code>Android.jar</code> to run as a standalone GUI app</p>\n"
  }, {
    "tags" : [ "java", "android", "kotlin", "mesibo" ],
    "owner" : {
      "account_id" : 4429209,
      "reputation" : 1,
      "user_id" : 3606728,
      "user_type" : "registered",
      "profile_image" : "https://www.gravatar.com/avatar/6a04db3294680e287219f47b05397ffb?s=256&d=identicon&r=PG&f=y&so-version=2",
      "display_name" : "user3606728",
      "link" : "https://stackoverflow.com/users/3606728/user3606728"
    },
    "is_answered" : false,
    "view_count" : 43,
    "answer_count" : 0,
    "score" : -3,
    "last_activity_date" : 1764417648,
    "creation_date" : 1764417648,
    "question_id" : 79833216,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79833216/mesibo-compilation-error-unresolved-reference-messageparams-in-mesibo-android",
    "title" : "mesibo Compilation Error: Unresolved reference &#39;MessageParams&#39; in Mesibo Android SDK 2.7.19 (Kotlin)",
    "body" : "<p>I am integrating the Mesibo Android SDK (version 2.7.19) into my Kotlin application. I need to implement the Mesibo.MessageListener interface to receive real-time messages, but I am facing a compilation error where Mesibo.MessageParams cannot be resolved.</p>\n<p><strong>Dependencies:</strong></p>\n<pre><code>kotlin\nimplementation(&quot;com.mesibo.api:mesibo:2.7.19&quot;)\nCode:\nkotlin\nimport com.mesibo.api.Mesibo\n// import com.mesibo.api.Mesibo.MessageParams // Fails: Unresolved reference\nclass MyActivity : AppCompatActivity(), Mesibo.MessageListener {\n    // Compilation Error: Unresolved reference: MessageParams\n    override fun Mesibo_onMessage(params: Mesibo.MessageParams?, data: ByteArray?): Boolean {\n        val message = String(data ?: ByteArray(0))\n        Log.d(&quot;Mesibo&quot;, &quot;Received: $message&quot;)\n        return true\n    }\n    override fun Mesibo_onMessageStatus(params: Mesibo.MessageParams?) {}\n    override fun Mesibo_onActivity(params: Mesibo.MessageParams?, activity: Int) {}\n    override fun Mesibo_onLocation(params: Mesibo.MessageParams?, location: Mesibo.Location?) {}\n    override fun Mesibo_onFile(params: Mesibo.MessageParams?, file: Mesibo.FileInfo?) {}\n}\n\nWhat I've Tried:\n</code></pre>\n<p><strong>Explicit Imports:</strong> Tried importing</p>\n<ol>\n<li>\n<pre><code>com.mesibo.api.Mesibo.MessageParams but the compiler says &quot;Unresolved reference&quot;.\n</code></pre>\n</li>\n<li><p><strong>Java Implementation:</strong> I created a Java test class to implement the interface. The compiler error suggested I was missing Mesibo_onMessageUpdate(MesiboMessage), implying the type is MesiboMessage. However, I cannot find or import com.mesibo.api.MesiboMessage.</p>\n</li>\n<li><p><strong>Downgrading:</strong> Tried version 2.5.0 but faced similar resolution issues.</p>\n</li>\n</ol>\n<p><strong>Question:</strong> What is the correct parameter type for Mesibo_onMessage</p>\n<p>in Mesibo SDK 2.7.19 for Kotlin? Is MessageParams deprecated or moved to a different package?</p>\n"
  }, {
    "tags" : [ "java", "android", "notifications", "fullscreen", "samsung" ],
    "owner" : {
      "account_id" : 5544381,
      "reputation" : 71,
      "user_id" : 4399667,
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      "profile_image" : "https://www.gravatar.com/avatar/28b205d153585e0009aa11aa2ab9dc55?s=256&d=identicon&r=PG",
      "display_name" : "Henrik",
      "link" : "https://stackoverflow.com/users/4399667/henrik"
    },
    "is_answered" : false,
    "view_count" : 89,
    "answer_count" : 0,
    "score" : 0,
    "last_activity_date" : 1764401106,
    "creation_date" : 1764401106,
    "question_id" : 79833109,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79833109/full-screen-intent-on-lock-screen-stopped-working-when-samsung-android-upgraded",
    "title" : "Full screen intent on Lock screen stopped working when Samsung Android upgraded to 14/145/16",
    "body" : "<p>My VoIP Android app shows a full-screen incoming call UI using Android’s full-screen intent (FSI).\nOn Samsung Android 16, the FSI works perfectly when installing the debug build — but fails completely in the release build (Play Store). I need help understanding the difference and why Samsung blocks it.</p>\n<p>Xiaomi: FSI works only after enabling “Show on Lock Screen” under “Other Permissions”. So OEM-specific suppressions exist.</p>\n<p>Samsung Android 16: No similar toggle available</p>\n<p>Permissions / settings (all granted by user)</p>\n<p>I am using an old build toolchain, and I cannot upgrade. Android Gradle Plugin, AGP version: 8.2.2, target: 34</p>\n<p>Push arrives via Batch.com (not Firebase-only).\nRelease and debug receive the push.\nOnly release fails to launch the full-screen Activity.</p>\n<p>Please analyze why the exact same code executes FSI on Samsung Android 16 in debug mode, but not in release mode, and provide:</p>\n<p>Samsung-specific rules that suppress full-screen intents (FSI).</p>\n<p>How Samsung differentiates “debug” and “release” apps at the OS level.</p>\n<p>Whether Samsung blocks FSI for non-dialer apps or non-privileged packages unless:</p>\n<p>App is default Dialer</p>\n<p>App has specific roles</p>\n<p>App meets call-style UI expectations</p>\n<p>Whether signature, Play Store install source, or app reputation affects FSI.</p>\n<p>Whether Samsung requires the CALL notification channel to be created ONLY once, or with specific flags.</p>\n<p>How to get equivalent to Xiaomi “Other permissions → Show on Lock screen” on Samsung.</p>\n<p>Any Samsung OneUI 6 / Android 16 behavior that silently downgrades CALL notifications to heads-up notifications for release apps.</p>\n<p>Any known OEM bugs where debug apps bypass FSI restrictions but release apps don’t.</p>\n<p>How to reliably force FSI to appear on Samsung for normal VoIP apps.</p>\n"
  }, {
    "tags" : [ "java", "windows", "audio", "javasound" ],
    "owner" : {
      "account_id" : 3396830,
      "reputation" : 396,
      "user_id" : 2850217,
      "user_type" : "registered",
      "accept_rate" : 42,
      "profile_image" : "https://i.sstatic.net/QZr9N.png?s=256",
      "display_name" : "JavaLatte",
      "link" : "https://stackoverflow.com/users/2850217/javalatte"
    },
    "is_answered" : false,
    "view_count" : 75,
    "closed_date" : 1764454499,
    "answer_count" : 0,
    "score" : 1,
    "last_activity_date" : 1764454476,
    "creation_date" : 1764383659,
    "last_edit_date" : 1764454476,
    "question_id" : 79833022,
    "link" : "https://stackoverflow.com/questions/79833022/audiosystem-isaudiolinesupported-returns-false",
    "closed_reason" : "Not suitable for this site",
    "title" : "AudioSystem,isAudioLineSupported returns false",
    "body" : "<p>I am trying to use some Java audio code that worked back in 2019. I am now using the Eclipse IDE with JavaSE-21 running on Windows 11. The following code is not working:</p>\n<pre><code>    AudioFormat af = makeAudioFormat();\n    DataLine.Info info = new DataLine.Info(TargetDataLine.class, af); \n    if (!AudioSystem.isLineSupported(info)) {\n        System.out.println(&quot;Unsupported audio format&quot;);\n        System.out.println(info);\n    }\n</code></pre>\n<p>The println outputs this information:</p>\n<pre><code>Unsupported audio format interface \nTargetDataLine supporting format PCM_SIGNED 44100.0 Hz, 16 bit, mono, 2 bytes/frame, big-endian\n</code></pre>\n<p>I have tried mono/stereo and big-endian/little-endian: they all fail.</p>\n<p>After looking at the Oracle documentation I tried this code:</p>\n<pre><code>    if (AudioSystem.isLineSupported(Port.Info.MICROPHONE)) {\n</code></pre>\n<p>It also fails with Port.Info.LINE_IN.</p>\n<p>Audio input definitely works with Audacity, and with the C program that I wish to replace The C program uses the line settings that I have specified here.</p>\n<p>In Settings/Privacy &amp; Security/Microphone, &quot;let apps access your microphone&quot; is enabled, and I can see records of Audacity and my C program using the microphone, but there is no reference to the Java app.</p>\n<p>If I go on and try to use the TargetDataLine anyway, I get the following stack trace:</p>\n<pre><code>Exception in thread &quot;AWT-EventQueue-0&quot; java.lang.IllegalArgumentException: No line matching interface TargetDataLine supporting format PCM_SIGNED 44100.0 Hz, 16 bit, mono, 2 bytes/frame, big-endian is supported.\n    at java.desktop/javax.sound.sampled.AudioSystem.getLine(AudioSystem.java:423)\n    at foo.recorder.AudioIn.&lt;init&gt;(AudioIn.java:75)\n    at foo.recorder.RecorderTab.startRecord(RecorderTab.java:379)\n    at foo.recorder.RecorderTab$6.buttonPressed(RecorderTab.java:364)\n    at foo.recorder.NoteClickImage$Listener.onClick(NoteClickImage.java:23)\n    at foo.recorder.ClickListener.mouseClicked(ClickListener.java:12)\n    at java.desktop/java.awt.AWTEventMulticaster.mouseClicked(AWTEventMulticaster.java:280)\n    at java.desktop/java.awt.Component.processMouseEvent(Component.java:6624)\n    at java.desktop/javax.swing.JComponent.processMouseEvent(JComponent.java:3398)\n    at java.desktop/java.awt.Component.processEvent(Component.java:6386)\n    at java.desktop/java.awt.Container.processEvent(Container.java:2266)\n    at java.desktop/java.awt.Component.dispatchEventImpl(Component.java:4996)\n    at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2324)\n    at java.desktop/java.awt.Component.dispatchEvent(Component.java:4828)\n    at java.desktop/java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4948)\n    at java.desktop/java.awt.LightweightDispatcher.processMouseEvent(Container.java:4584)\n    at java.desktop/java.awt.LightweightDispatcher.dispatchEvent(Container.java:4516)\n    at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2310)\n    at java.desktop/java.awt.Window.dispatchEventImpl(Window.java:2780)\n    at java.desktop/java.awt.Component.dispatchEvent(Component.java:4828)\n    at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:775)\n    at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:720)\n    at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:714)\n    at java.base/java.security.AccessController.doPrivileged(AccessController.java:400)\n    at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:87)\n    at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:98)\n    at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:747)\n    at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:745)\n    at java.base/java.security.AccessController.doPrivileged(AccessController.java:400)\n    at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:87)\n    at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:744)\n    at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)\n    at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)\n    at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)\n    at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)\n    at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)\n    at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)\n</code></pre>\n<p>I have read that this exception can also be caused by a security issue.</p>\n<hr>\nFollowing @greg-449's advice, I added code to list available Source datalines, which produced this:\n<pre><code>Mixer: Primary Sound Driver\n  interface SourceDataLine supporting 8 audio formats, and buffers of at least 32 bytes\n    PCM_UNSIGNED unknown sample rate, 8 bit, mono, 1 bytes/frame\n    PCM_SIGNED unknown sample rate, 8 bit, mono, 1 bytes/frame\n    PCM_SIGNED unknown sample rate, 16 bit, mono, 2 bytes/frame, little-endian\n    PCM_SIGNED unknown sample rate, 16 bit, mono, 2 bytes/frame, big-endian\n    PCM_UNSIGNED unknown sample rate, 8 bit, stereo, 2 bytes/frame\n    PCM_SIGNED unknown sample rate, 8 bit, stereo, 2 bytes/frame\n    PCM_SIGNED unknown sample rate, 16 bit, stereo, 4 bytes/frame, little-endian\n    PCM_SIGNED unknown sample rate, 16 bit, stereo, 4 bytes/frame, big-endian\n</code></pre>\n<p>It lists lots of SourceDataLines, but no TargetDataLines. As i understand it, a source is (rather illogically) an output, and a target is an input, so I have the choice of lots of output formats, but no input formats. This confirms my view that it's a security issue.</p>\n<hr>\n<p>I added this code to check whether I have permission to record:</p>\n<pre><code>    javax.sound.sampled.AudioPermission ap = new javax.sound.sampled.AudioPermission(&quot;record&quot;);\n    System.out.println (&quot;audio permission &quot; + ap.toString());\n    \n     try {\n            // Check if the current execution context has the permission\n            AccessController.checkPermission(ap);\n            System.out.println(&quot;Permission is granted. The app can record audio.&quot;);\n            // Proceed with the action\n        } catch (SecurityException e) {\n            System.out.println(&quot;Permission denied. The app cannot rrecord audio.&quot;);\n            // Handle the lack of permission gracefully\n            e.printStackTrace();\n        }\n</code></pre>\n<p>And this is the result:</p>\n<pre><code>audio permission (&quot;javax.sound.sampled.AudioPermission&quot; &quot;record&quot;)\nPermission denied. The app cannot rrecord audio.\njava.security.AccessControlException: access denied (&quot;javax.sound.sampled.AudioPermission&quot; &quot;record&quot;)\n    at java.base/java.security.AccessControlContext.checkPermission(AccessControlContext.java:488)\n    at java.base/java.security.AccessController.checkPermission(AccessController.java:1071)\n</code></pre>\n<p>I tried creating an app.policy file with audio play and record permissions and added it as a VM parameter in Eclipse.</p>\n<ul>\n<li>The above code now reports that I have permission to record</li>\n<li>I get a message saying that Security Manager is deprecated</li>\n<li>I get a security exception when I try to read a file</li>\n<li>I still see no TargetDataLines, and I can't open one.</li>\n</ul>\n"
  }, {
    "tags" : [ "java", "oop", "orm" ],
    "owner" : {
      "account_id" : 27813865,
      "reputation" : 12,
      "user_id" : 21235710,
      "user_type" : "registered",
      "profile_image" : "https://lh3.googleusercontent.com/a/AEdFTp6OFaDu0sSOCSAM8ZrYsDyhz4tiQ2SO1n8u-OnMXA=k-s256",
      "display_name" : "Mohamed Selmi",
      "link" : "https://stackoverflow.com/users/21235710/mohamed-selmi"
    },
    "is_answered" : false,
    "view_count" : 94,
    "answer_count" : 1,
    "score" : -1,
    "last_activity_date" : 1764447189,
    "creation_date" : 1764373622,
    "last_edit_date" : 1764381785,
    "question_id" : 79832984,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79832984/java-oop-association-sql-equivalent",
    "title" : "Java OOP association SQL equivalent",
    "body" : "<p>I have two classes: Student and Group.</p>\n<p>Student attributes:</p>\n<pre><code>private String registrationNumber;\nprivate String firstName;\nprivate String lastName;\nprivate Date dateOfBirth;\nprivate String password;\nprivate Groupe groupe;\nprivate List&lt;Grades&gt; studentGrades;\n</code></pre>\n<p>Student Constructor:</p>\n<pre><code>\npublic Student(String registrationNumber, String firstName, String lastName, Date dateOfBirth, Groupe groupe,String password) {\n    super();\n    this.registrationNumber = registrationNumber;\n    this.firstName = firstName;\n    this.lastName = lastName;\n    this.dateOfBirth = dateOfBirth;\n    this.groupe = groupe;\n    this.password=password;\n}\n</code></pre>\n<p>Group attributes:</p>\n<pre><code>private int idGroup;\nprivate String nameGroup;\nprivate List&lt;Student&gt; students;\nprivate List&lt;Subject&gt; subjects;\n</code></pre>\n<p>Its constructor takes only idGroup and nameGroup.</p>\n<p>When registering, a student will select a group from a drop down menu (Swing interface) which will then call the addStudent function (controller to DAO).</p>\n<pre><code>public boolean addStudent( Student s) throws SQLException {\n        myStatement=myConnection.getMyConnection().createStatement();\n        String request=&quot;insert into student values('&quot;+s.getRegistrationNumber()+&quot;','&quot;+s.getFirstName()+&quot;','&quot;+s.getLastName()+&quot;','&quot;+s.getDateOfBirth()+&quot;','&quot;+s.getPassword()+&quot;')&quot;;\n        return myStatement.executeUpdate(request)&gt;0;\n    }\n</code></pre>\n<p>Which is currently missing the group attribute.</p>\n<p>How should I translate the group attribute (and by extension all other associations) from OOP to a relational format?</p>\n<p>Should I drop these association from student and use an int attribute that represents a foreign key which refrences the Group table's primary key and rely on joins for the List (1..n associations)?</p>\n"
  }, {
    "tags" : [ "java", "maven", "intellij-idea" ],
    "owner" : {
      "account_id" : 9041643,
      "reputation" : 421,
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      "profile_image" : "https://www.gravatar.com/avatar/32a8de8fd0f0893a1512046459a8abce?s=256&d=identicon&r=PG&f=y&so-version=2",
      "display_name" : "Timbuck",
      "link" : "https://stackoverflow.com/users/6735683/timbuck"
    },
    "is_answered" : false,
    "view_count" : 64,
    "closed_date" : 1764590265,
    "answer_count" : 0,
    "score" : 1,
    "last_activity_date" : 1764593647,
    "creation_date" : 1764340896,
    "last_edit_date" : 1764593647,
    "question_id" : 79832663,
    "link" : "https://stackoverflow.com/questions/79832663/java-project-dependency-jar-only-part-of-new-code-being-recognized",
    "closed_reason" : "Not suitable for this site",
    "title" : "Java project dependency jar - only part of new code being recognized",
    "body" : "<p>I have a Java service that relies on a dependency jar that I have modified. Within the dependency I have updated 2 different sections of code for unrelated functionality. I have updated the version of the jar and am including its use within the service via Maven.</p>\n<p>Within the service, when I run the code locally via IntelliJ that calls the dependency functionality I get:</p>\n<ol>\n<li>The expected, new behavior for one of the code changes.</li>\n<li>Unexpected, previous behavior for the other code change. In this case, I have modified the value of a string that is being set when the code is invoked but the result is how the string was set in the old code.</li>\n</ol>\n<p>My expectation is that using the new version of the jar will result in the use of the new code in both instances. StackOverflow closed my question and has asked that I provide code to reproduce the problem directly, but I'm not sure how I am supposed to do that since this is abnormal behavior.</p>\n<ul>\n<li>The previous version:</li>\n</ul>\n<pre><code>Collections.sort(errorRecords);\nfe.setErrorMessage(&quot;Failed records - &quot; + errorRecords);\n</code></pre>\n<p>where <code>errorRecords</code> is a <code>List&lt;Integer&gt;</code></p>\n<ul>\n<li>The new version:</li>\n</ul>\n<pre><code>fe.setErrorMessage(&quot;Failed record(s) - please see documentation for remediation steps.&quot;);\n</code></pre>\n<p>For troubleshooting I have done the following:</p>\n<ul>\n<li>Deleted all previous versions of the jar from the Maven m2 repo</li>\n<li>Performed <code>mvn clean install</code> on my service</li>\n<li>Verified that after the <code>mvn</code> call that the only version of the jar in the repo is the new one</li>\n<li>Invalidated IntelliJ cache - I am using version 2025.2.5 Ultimate</li>\n<li>Opened the packaged, new jar from the m2 repository to view the .class file, and confirmed my new code is present.</li>\n<li>Validated that the version of the jar being used by IntelliJ (in the External Libraries section) is the new version</li>\n<li>Attempted to view the code within IntelliJ. Unfortunately the method where my new code is cannot be decompiled by the Fern Flower decompiler in IntelliJ, so I cannot confirm the new code is present via stepping through the code via debugger. All I see there is <code>// $FF: Couldn't be decompiled</code> message. This is present when using older versions of the jar as well.</li>\n<li>Rebooted as a last resort. This is running on macOS 15.7.2. As expected, that didn't fix anything.</li>\n</ul>\n<p>I've run out of ideas of where to look next. Any thoughts?</p>\n"
  }, {
    "tags" : [ "java", "tcp", "limit" ],
    "owner" : {
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      "display_name" : "davidto",
      "link" : "https://stackoverflow.com/users/7207333/davidto"
    },
    "is_answered" : false,
    "view_count" : 191,
    "closed_date" : 1764643064,
    "answer_count" : 1,
    "score" : 0,
    "last_activity_date" : 1764849747,
    "creation_date" : 1764340056,
    "last_edit_date" : 1764504083,
    "question_id" : 79832652,
    "link" : "https://stackoverflow.com/questions/79832652/cant-open-more-than-8000-tcp-connections-with-java",
    "closed_reason" : "Not suitable for this site",
    "title" : "Can&#39;t open more than 8000 TCP connections with Java",
    "body" : "<p>I am trying to open to open 10K+ connections to a server, but my app stops at 8K connections when looking at the server logs. When using two remote servers, it will struggles when reaching between 8K and 9K connections. This makes me belief the problem is on the client side.</p>\n<p>I tried the following settings on the client:</p>\n<ul>\n<li><p>Setting the ephemeral ports:net.ipv4.ip_local_port_range = 32768 60999</p>\n</li>\n<li><p>Setting the ulimit to 65535</p>\n</li>\n</ul>\n<p>But still my Java application can't open more than 8K outgoing connections.</p>\n<p>Some experimenting showed that:</p>\n<ul>\n<li><p>Doing a little less than 8K in rapid succession is fine.</p>\n</li>\n<li><p>Doing 8.1K requests causes a 30 delay before it continues with only little bursts.</p>\n</li>\n<li><p>During the tests the machine never runs out of CPU or memory. During the delay it goes back to running at an idle 1-2%.</p>\n</li>\n<li><p>No error or exception is being thrown.</p>\n</li>\n</ul>\n<p>The code:</p>\n<pre><code>import java.io.IOException;\nimport java.net.URI;\nimport java.net.URL;\nimport java.net.http.HttpClient;\nimport java.net.http.HttpRequest;\nimport java.net.http.HttpResponse;\nimport java.time.Duration;\nimport java.util.concurrent.ExecutorService;\nimport java.util.concurrent.Executors;\nimport java.util.stream.IntStream;\n\npublic class SimpleRunner {\n    HttpClient client = HttpClient.newBuilder()\n            .version(HttpClient.Version.HTTP_1_1)\n            .followRedirects(HttpClient.Redirect.NORMAL)\n            .connectTimeout(Duration.ofDays(1))\n            .build();\n\n\n    public void main(String... args) throws IOException {\n        long pid = ProcessHandle.current().pid();\n        System.out.println(&quot;pid = &quot; + pid);\n\n        try (var executor = Executors.newVirtualThreadPerTaskExecutor()) {\n            benchmarkingMethod(executor);\n        }\n    }\n\n\n    private void benchmarkingMethod(ExecutorService executor) {\n        IntStream.range(0, 10_000).forEach(i -&gt;\n                executor.submit(() -&gt; {\n                    try {\n                        String response1 =  fetchJavaNineStyle(URI.create(&quot;http://localhost:8080/v1/delay/0&quot;).toURL());\n                    } catch (Exception e) {\n                        throw new RuntimeException(e);\n                    }\n                })\n        );\n    }\n\n    String fetchJavaNineStyle(URL url){\n        try {\n            return client.sendAsync(HttpRequest.newBuilder().GET().uri(url.toURI()).build(), HttpResponse.BodyHandlers.ofString()).get().body();\n        } catch (Exception e) {\n            throw new RuntimeException(e);\n        }\n    }\n}\n</code></pre>\n"
  }, {
    "tags" : [ "java", "java-resources" ],
    "owner" : {
      "account_id" : 3396830,
      "reputation" : 396,
      "user_id" : 2850217,
      "user_type" : "registered",
      "accept_rate" : 42,
      "profile_image" : "https://i.sstatic.net/QZr9N.png?s=256",
      "display_name" : "JavaLatte",
      "link" : "https://stackoverflow.com/users/2850217/javalatte"
    },
    "is_answered" : false,
    "view_count" : 107,
    "answer_count" : 0,
    "score" : 1,
    "last_activity_date" : 1764376682,
    "creation_date" : 1764338869,
    "last_edit_date" : 1764376682,
    "question_id" : 79832635,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79832635/getresource-returns-null-for-a-resource-that-does-exist",
    "title" : "getResource returns null for a resource that does exist",
    "body" : "<p>I have resurrected a program written in Java using Eclipse: I last worked on it in 2016. I am now using JaveSE-21, and this code no longer works- the returned URL is null.</p>\n<pre><code>String name = &quot;res/images/ifx_micro_red.png&quot;;\nURL url = ClickImage.class.getClassLoader().getResource(name);\n</code></pre>\n<p>res and res.images appear directly below src in the project tree.</p>\n<p>If I add this code just beforehand, the file ifx_micro_red.png is listed.</p>\n<pre><code>Scanner scanner = new Scanner(ClickImage.class.getClassLoader().getResourceAsStream(&quot;res/images&quot;));\nwhile (scanner.hasNextLine()) {\n   System.out.println(scanner.nextLine());\n}\nscanner.close ();\n</code></pre>\n<p>I don't understand how getResourceAsStream can find the file, but getResource cannot.</p>\n<hr>\nUpdate: I used the debugger to step into getResource, and found that it returns null because the module descriptor says that open is false. \nSo, I am allowed to see that the file appears in the listing of the res/images directory, but I am not allowed to open it, and this (bizarrely) is implemented by returning a null URL for the file. \n<p>It seems that I need to put something like\nres open\nin the module_info file, but I have not yet found the correct syntax.</p>\n"
  }, {
    "tags" : [ "java", "android", "security", "android-security" ],
    "owner" : {
      "account_id" : 44835901,
      "reputation" : 1,
      "user_id" : 31960887,
      "user_type" : "registered",
      "profile_image" : "https://www.gravatar.com/avatar/e32d0e5115524cd97d5043cc070ee418?s=256&d=identicon&r=PG&f=y&so-version=2",
      "display_name" : "Aadish",
      "link" : "https://stackoverflow.com/users/31960887/aadish"
    },
    "is_answered" : false,
    "view_count" : 45,
    "closed_date" : 1764329921,
    "answer_count" : 0,
    "score" : -4,
    "last_activity_date" : 1764328222,
    "creation_date" : 1764328222,
    "question_id" : 79832493,
    "link" : "https://stackoverflow.com/questions/79832493/what-is-setallowuniversalaccessfromfileurlstrue",
    "closed_reason" : "Needs details or clarity",
    "title" : "What is setAllowUniversalAccessFromFileURLs(true)",
    "body" : "<p>What are vulnerabilitites can occur by this and prevention tech in code level ?</p>\n"
  }, {
    "tags" : [ "java", "mongodb", "mongodb-java" ],
    "owner" : {
      "account_id" : 6172677,
      "reputation" : 361,
      "user_id" : 4810545,
      "user_type" : "registered",
      "profile_image" : "https://www.gravatar.com/avatar/2aad20feb1a6bd56d24cc068398bc575?s=256&d=identicon&r=PG&f=y&so-version=2",
      "display_name" : "the",
      "link" : "https://stackoverflow.com/users/4810545/the"
    },
    "is_answered" : true,
    "view_count" : 76,
    "answer_count" : 1,
    "score" : 0,
    "last_activity_date" : 1764663443,
    "creation_date" : 1764324063,
    "last_edit_date" : 1764663443,
    "question_id" : 79832443,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79832443/filters-eqfieldname-value-not-actually-creating-eq-causes-issues",
    "title" : "`Filters.eq(fieldName, value)` not actually creating `$eq` causes issues",
    "body" : "<p>I'm not sure if this is a MongoDB issue, an issue with the mongo-java-driver or if I'm doing something worng.</p>\n<p>The issue is that MongoDB can behave differently in case there is a <code>$eq</code> operator or if a <code>{fieldName: value}</code> syntax is used. See an example here: <a href=\"https://mongoplayground.net/p/sXKR2FvE5eg\" rel=\"nofollow noreferrer\">https://mongoplayground.net/p/sXKR2FvE5eg</a></p>\n<p>I want to group by the <code>groupBy</code> field and want the <code>type: &quot;A&quot;</code> objects to be in a <code>typeA</code> field and vice versa for B.</p>\n<p>I used the mongo-java-driver which does not create <code>$eq</code> operator in case <code>Filter.eq</code> is used, see <a href=\"https://github.com/mongodb/mongo-java-driver/blob/main/driver-core/src/main/com/mongodb/client/model/Filters.java#L79-L80\" rel=\"nofollow noreferrer\">documentation</a></p>\n<p>For <code>typeA</code> I used <code>$eq</code> in the example and for <code>typeB</code> I used the <code>non-$eq</code> syntax. As the example demonstrates, the <code>$eq</code> operator actually filters correctly, but the <code>non-$eq</code> syntax does not.</p>\n<p>So the question is, is this an actual MongoDB issue or should <code>Filters.eq</code> always created an <code>$eq</code> in the mongo-java-driver?</p>\n<hr />\n<p>Minimal example:\nThe following code:</p>\n<pre class=\"lang-java prettyprint-override\"><code>var typeAPush = Accumulators.push(&quot;typeA&quot;, new Document(&quot;$cond&quot;, Arrays.asList(\n        new Document(&quot;$eq&quot;, Arrays.asList(&quot;$type&quot;, &quot;A&quot;)),\n        &quot;$$ROOT&quot;,\n        &quot;$$REMOVE&quot;\n)));\nvar typeBPush = Accumulators.push(&quot;typeB&quot;, new Document(&quot;$cond&quot;, Arrays.asList(\n        // Using Filter.eq which does not create `$eq`\n        Filters.eq(&quot;$type&quot;, &quot;B&quot;),\n        &quot;$$ROOT&quot;,\n        &quot;$$REMOVE&quot;\n)));\nvar groupStage = Aggregates.group(&quot;$groupBy&quot;,\n        typeAPush,\n        typeBPush\n);\n</code></pre>\n<p>will produce the following Bson:</p>\n<pre><code>{\n  &quot;$group&quot;: {\n    &quot;_id&quot;: &quot;$groupBy&quot;,\n    &quot;typeA&quot;: {\n      &quot;$push&quot;: {\n        &quot;$cond&quot;: [\n          {\n            &quot;$eq&quot;: [\n              &quot;$type&quot;,\n              &quot;A&quot;\n            ]\n          },\n          &quot;$$ROOT&quot;,\n          &quot;$$REMOVE&quot;\n        ]\n      }\n    },\n    &quot;typeB&quot;: {\n      &quot;$push&quot;: {\n        &quot;$cond&quot;: [\n          {\n            &quot;$type&quot;: &quot;B&quot;\n          },\n          &quot;$$ROOT&quot;,\n          &quot;$$REMOVE&quot;\n        ]\n      }\n    }\n  }\n}\n</code></pre>\n<p>Note the difference of <code>$cond</code> between <code>typeA</code> and <code>typeB</code>. In case of <code>typeB</code> the condition will always be true.</p>\n"
  }, {
    "tags" : [ "java", "javafx", "launch4j" ],
    "owner" : {
      "account_id" : 23178316,
      "reputation" : 327,
      "user_id" : 17276486,
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      "display_name" : "Lson",
      "link" : "https://stackoverflow.com/users/17276486/lson"
    },
    "is_answered" : false,
    "view_count" : 76,
    "answer_count" : 0,
    "score" : 1,
    "last_activity_date" : 1764329748,
    "creation_date" : 1764294932,
    "last_edit_date" : 1764329748,
    "question_id" : 79832191,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79832191/how-to-add-64-bit-os-check-for-java-17-javafx-app-when-packaging-with-launch4j-m",
    "title" : "How to add 64-bit OS check for Java 17 JavaFX app when packaging with launch4j-maven-plugin?",
    "body" : "<p>I'm working on a JavaFX application that requires Java 17+, which only supports 64-bit operating systems. I'm using the <code>launch4j-maven-plugin</code> to create an EXE file, and I need to ensure that when users click the EXE, it checks if they're running a 64-bit OS before attempting to launch the JVM.</p>\n<p>The challenge is that this detection logic cannot be written in Java code since Java 17 won't run at all on 32-bit systems. I need a way to implement this check at the native wrapper level before the JVM even starts.</p>\n<p>What approaches are available with launch4j to:</p>\n<ol>\n<li>Detect the operating system architecture (32-bit vs 64-bit) at the native level</li>\n<li>Show a custom error message if the system is 32-bit</li>\n<li>Prevent the JVM from attempting to start on incompatible systems</li>\n</ol>\n"
  }, {
    "tags" : [ "java", "android", "gradle" ],
    "owner" : {
      "account_id" : 44831644,
      "reputation" : 3,
      "user_id" : 31958440,
      "user_type" : "registered",
      "profile_image" : "https://www.gravatar.com/avatar/16f60b4adc14cdd5c2ca570cfd54c1af?s=256&d=identicon&r=PG&f=y&so-version=2",
      "display_name" : "user31958440",
      "link" : "https://stackoverflow.com/users/31958440/user31958440"
    },
    "is_answered" : true,
    "view_count" : 86,
    "closed_date" : 1764336852,
    "accepted_answer_id" : 79832253,
    "answer_count" : 1,
    "score" : 0,
    "last_activity_date" : 1764306085,
    "creation_date" : 1764293882,
    "question_id" : 79832184,
    "link" : "https://stackoverflow.com/questions/79832184/why-can-i-not-seem-to-get-gradle-to-work",
    "closed_reason" : "Not suitable for this site",
    "title" : "Why can I not seem to get gradle to work?",
    "body" : "<p>I am trying to make an app for android, just a small little &quot;Hello World&quot; app to assess how it all works. I have tried on numerous occasions to get gradle to wrap the app but I just keep running into error after error after failed attempt... This is more or less the procedure that I have used on 3+ occasions:</p>\n<ol>\n<li><p>I install android studio, jdk 17, and gradle (default install ver. 4 had to remove and wget the .deb for v8)</p>\n</li>\n<li><p>point JAVA_HOME:</p>\n<p>export JAVA_HOME=/PATH/TO/JAVA</p>\n<p>export PATH=$JAVA_HOME/bin:$PATH</p>\n</li>\n<li><p>make my basic app structure and starting code and verified with ai</p>\n</li>\n<li><p>thought gradle wrapper needed to run in project root, then learned that it needs to run in the main folder. ran gradle wrapper in .../app/src/main/</p>\n</li>\n<li><p>chmod +x gradlew</p>\n</li>\n<li><p>and then ./gradlew assembleDebug</p>\n<p>At this point, either only default tasks are available (or a short list with nothing helpful) or a longer list that does not include assembleDebug and even when I just try to do ./gradlew build, the build fails immediately. I removed any scrap of JDK or gradle from my system so if anyone can tell me maybe where i am going wrong here I would appreciate it</p>\n</li>\n</ol>\n"
  }, {
    "tags" : [ "java", "json", "gson" ],
    "owner" : {
      "account_id" : 44830072,
      "reputation" : 1,
      "user_id" : 31957750,
      "user_type" : "registered",
      "profile_image" : "https://www.gravatar.com/avatar/ca7ce31ed79ad2487445e1370e877f72?s=256&d=identicon&r=PG&f=y&so-version=2",
      "display_name" : "Silver Hyangiraikyo",
      "link" : "https://stackoverflow.com/users/31957750/silver-hyangiraikyo"
    },
    "is_answered" : false,
    "view_count" : 68,
    "answer_count" : 1,
    "score" : 0,
    "last_activity_date" : 1764342252,
    "creation_date" : 1764276315,
    "last_edit_date" : 1764327590,
    "question_id" : 79832067,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79832067/exclude-map-name-when-parsing-gson-to-json",
    "title" : "Exclude map name when parsing GSon to JSON",
    "body" : "<p>I have something like this:</p>\n<pre class=\"lang-java prettyprint-override\"><code>String data = new Gson().toJson(myCoolObject);\n</code></pre>\n<p><code>myCoolObject</code> has a <code>HashMap</code>. The resulting string ends up containing not just the keys and values of the map, but also the map's name. Like this:</p>\n<pre class=\"lang-java prettyprint-override\"><code>{  \n  &quot;reallyUncoolMap&quot;: {\n    &quot;mapKey1&quot;: {\n      &quot;someValue1&quot;: &quot;ABC&quot;\n    },\n    &quot;mapKey2&quot;: {\n      &quot;someValue2&quot;: &quot;DEF&quot;\n    }\n  }\n}\n</code></pre>\n<p>I would like it to be more like this, without the map's name:</p>\n<pre class=\"lang-java prettyprint-override\"><code>{  \n    &quot;mapKey1&quot;: {\n      &quot;someValue1&quot;: &quot;ABC&quot;\n    },\n    &quot;mapKey2&quot;: {\n      &quot;someValue2&quot;: &quot;DEF&quot;\n    } \n}\n</code></pre>\n<p>But I have no idea how to do that...</p>\n"
  }, {
    "tags" : [ "java", "spring-boot", "spring-mvc", "spring-jdbc", "spring-4" ],
    "owner" : {
      "account_id" : 9189818,
      "reputation" : 127,
      "user_id" : 6830765,
      "user_type" : "registered",
      "profile_image" : "https://www.gravatar.com/avatar/8ac19c14b8b885b548afa6eb06104560?s=256&d=identicon&r=PG",
      "display_name" : "Jeremy Lanssiers",
      "link" : "https://stackoverflow.com/users/6830765/jeremy-lanssiers"
    },
    "is_answered" : true,
    "view_count" : 139,
    "answer_count" : 3,
    "score" : 1,
    "last_activity_date" : 1764394891,
    "creation_date" : 1764273188,
    "last_edit_date" : 1764394891,
    "question_id" : 79832040,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79832040/using-pagination-sorting-in-spring-boot-4-with-crudrepository-pagingandsorti",
    "title" : "Using Pagination &amp; Sorting in Spring Boot 4 with CrudRepository &amp; PagingAndSortingRepository on JDBC",
    "body" : "<p>I am doing the learning on Broadcom's Spring Academy to be up to date with the latest best practices. I bumped Spring Boot to 4.0.0 instead of the 3.0.0 on Spring Academy. But I am having some issues with PagingAndSortingRepository interface. I can succesfully use pagination <code>/demo?page=0&amp;size=1</code> and sorting <code>/demo?sort=amount,desc</code> but I cannot use the combination <code>/demo?page=0&amp;size=1&amp;sort=amount,desc</code>. And I cannot figure out how to fix it with JDBC.</p>\n<p>build.gradle</p>\n<pre class=\"lang-none prettyprint-override\"><code>plugins {\n    id 'java'\n    id 'org.springframework.boot' version '4.0.0'\n    id 'io.spring.dependency-management' version '1.1.7'\n}\n\ngroup = 'com.example'\nversion = '0.0.1-SNAPSHOT'\ndescription = 'Demo project for Spring Boot'\n\njava {\n    sourceCompatibility = '17'\n}\n\nrepositories {\n    mavenCentral()\n}\n\ndependencies {\n    // Rest API\n    implementation 'org.springframework.boot:spring-boot-starter-webmvc'\n    testImplementation 'org.springframework.boot:spring-boot-starter-webmvc-test'\n\n    // Database\n    implementation 'org.springframework.boot:spring-boot-starter-data-jdbc'\n    runtimeOnly 'com.h2database:h2'\n\n    // Security\n    implementation 'org.springframework.boot:spring-boot-starter-security'\n    implementation 'org.thymeleaf.extras:thymeleaf-extras-springsecurity6'\n    testImplementation 'org.springframework.security:spring-security-test'\n\n    // Test\n    testRuntimeOnly 'org.junit.platform:junit-platform-launcher'\n}\n\ntasks.named('test') {\n    useJUnitPlatform()\n}\n\ntest {\n    testLogging {\n        events &quot;passed&quot;, &quot;skipped&quot;, &quot;failed&quot; //, &quot;standardOut&quot;, &quot;standardError&quot;\n\n        showExceptions true\n        exceptionFormat &quot;full&quot;\n        showCauses true\n        showStackTraces true\n\n        // Change from false to true\n        showStandardStreams = true\n    }\n}\n</code></pre>\n<p>DemoRepository.java</p>\n<pre class=\"lang-java prettyprint-override\"><code>interface DemoRepository extends CrudRepository&lt;Demo, Long&gt;, PagingAndSortingRepository&lt;Demo, Long&gt; {\n    boolean existsByIdAndOwner(Long id, String owner);\n\n    Demo findByIdAndOwner(Long id, String owner);\n\n    Page&lt;Demo&gt; findByOwner(String owner, Pageable pageable);\n}\n</code></pre>\n<p>DemoController.java\n(I commented the problematic line proposed on Spring Academy and replaced it by the simpler one above.)</p>\n<pre class=\"lang-java prettyprint-override\"><code>    @GetMapping\n    private ResponseEntity&lt;List&lt;Demo&gt;&gt; readDemos(Pageable pageable, Principal principal) {\n        Page&lt;Demo&gt; page = demoRepository.findByOwner(principal.getName(),\n                PageRequest.of(\n                        pageable.getPageNumber(),\n                        pageable.getPageSize(),\n                        pageable.getSort()\n                        // pageable.getSortOr(Sort.by(Sort.Direction.ASC, &quot;amount&quot;))\n                ));\n\n        return ResponseEntity.ok(page.getContent());\n    }\n</code></pre>\n<p>DemoApplicationTests.java\n(If I use the previous code, it works fine. But if I use the commented out line, it breaks.)</p>\n<pre class=\"lang-java prettyprint-override\"><code> @Test\n    void readDemos_sorting() {\n        EntityExchangeResult&lt;String&gt; result = client.get()\n                .uri(&quot;/demo?page=0&amp;size=1&amp;sort=amount,desc&quot;)\n                .header(HttpHeaders.AUTHORIZATION, authHeader)\n                .exchange()\n                .expectStatus()\n                .isOk()\n                .expectHeader()\n                .contentTypeCompatibleWith(MediaType.APPLICATION_JSON)\n                .expectBody(String.class)\n                .returnResult();\n\n        String responseBody = result.getResponseBody();\n\n        DocumentContext documentContext = JsonPath.parse(responseBody);\n        JSONArray read = documentContext.read(&quot;$[*]&quot;);\n        assertThat(read.size()).isEqualTo(3);\n\n        double amount = documentContext.read(&quot;$[0].amount&quot;);\n        assertThat(amount).isEqualTo(150.00);\n    }\n</code></pre>\n<p>Error when using the commented out line:</p>\n<pre class=\"lang-none prettyprint-override\"><code>org.h2.jdbc.JdbcSQLSyntaxErrorException: Column &quot;DEMO.AMOUNT&quot; must be in the GROUP BY list; SQL statement:\nSELECT COUNT(*) FROM &quot;DEMO&quot; WHERE &quot;DEMO&quot;.&quot;OWNER&quot; = ? ORDER BY &quot;DEMO&quot;.&quot;AMOUNT&quot; ASC [90016-240]\n</code></pre>\n<p>Also, other tests testing the sorting logic fail, whereas they work when I use <code>pageable.getSort()</code>.</p>\n<p>One one hand, I can use <code>pageable.getSort()</code> to support a default call without any sorting params; it also supports sort params; but I cannot combine those sort params with the pagination params or it fails.</p>\n<p>On the other hand, if I use <code>pageable.getSortOr(Sort.by(Sort.Direction.ASC, &quot;amount&quot;))</code>, all sorting fails, and if I use pagination params without sorting params, I get that SQL error.</p>\n<p>View the full code on <a href=\"https://github.com/jlanssie/spring-boot\" rel=\"nofollow noreferrer\">GitHub</a></p>\n"
  }, {
    "tags" : [ "java", "methods", "formatting" ],
    "owner" : {
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      "display_name" : "Fatko",
      "link" : "https://stackoverflow.com/users/31957122/fatko"
    },
    "is_answered" : true,
    "view_count" : 102,
    "closed_date" : 1764927331,
    "answer_count" : 1,
    "score" : -7,
    "last_activity_date" : 1764414624,
    "creation_date" : 1764266863,
    "last_edit_date" : 1764414624,
    "question_id" : 79831997,
    "link" : "https://stackoverflow.com/questions/79831997/formatting-the-first-symbol-of-a-string-to-be-upper-case-a-private-method-or-f",
    "closed_reason" : "Opinion-based",
    "title" : "Formatting the first symbol of a string to be upper case - a private method or formatting on the go?",
    "body" : "<p>In a class that has a bunch of functions, should I be making a separate private method specifically for formatting or should I just be formatting in every function that requires a string to be formatted?</p>\n<p>Method for formatting:</p>\n<pre class=\"lang-java prettyprint-override\"><code>private String formatItemName(String item) {\n    item = item.toLowerCase();                     // make all letters lowercase\n    return item.substring(0, 1).toUpperCase()      // capitalize first letter\n            + item.substring(1);                   // add the rest\n}\n</code></pre>\n"
  }, {
    "tags" : [ "java", "spring-boot", "spring-cloud-gateway" ],
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      "reputation" : 1,
      "user_id" : 31067338,
      "user_type" : "registered",
      "profile_image" : "https://www.gravatar.com/avatar/70b79462e4a710d068c7195291faf3f7?s=256&d=identicon&r=PG&f=y&so-version=2",
      "display_name" : "Snilspefad",
      "link" : "https://stackoverflow.com/users/31067338/snilspefad"
    },
    "is_answered" : true,
    "view_count" : 63,
    "answer_count" : 1,
    "score" : -1,
    "last_activity_date" : 1764965558,
    "creation_date" : 1764265982,
    "last_edit_date" : 1764965558,
    "question_id" : 79831984,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79831984/http-403-when-authentication-in-spring-authentication-server-after-login-in-spr",
    "title" : "HTTP-403 when authentication in spring authentication server after /login in spring cloud gateway",
    "body" : "<p>I trying to setup cooperation of gateway and authorization server.</p>\n<p>help me to find error in the program, when i authenticate me and enter to web authentication form username=<code>admin</code> and password=<code>1</code> i getting http error code <code>403</code> - forbidden and browser shows web page with words 'Access denied'. The project consists two maven modules: <code>spring cloud gateway and spring authorization server</code></p>\n<p>authorization server returns the <code>authorization code</code> when i put link <a href=\"http://localhost:9000/oauth2/authorize?response_type=code&amp;client_id=gateway&amp;redirect_uri=http://localhost:8080/\" rel=\"nofollow noreferrer\">http://localhost:9000/oauth2/authorize?response_type=code&amp;client_id=gateway&amp;redirect_uri=http://localhost:8080/</a> to the browser. And returns <code>access_token</code> when i execute code:</p>\n<pre class=\"lang-bash prettyprint-override\"><code>curl -X POST 'http://localhost:9000/oauth2/token' \\\n--header &quot;Authorization: Basic Z2F0...&quot; \\\n--header &quot;Content-Type: application/x-www-form-urlencoded&quot; \\\n-d &quot;client_id=gateway&quot; \\\n-d &quot;redirect_uri=http://localhost:8080/&quot; \\\n-d &quot;grant_type=authorization_code&quot; \\\n-d &quot;code=EHZl1xZY7WNF0hNzcWbA8jgBYzlAoQWphmBUEaZLUE2VAw0hDIDB4A-E6emLZl_rK3tRm8HCEYRb8vvAKvc9NVACQnFJ6RO3Yeo19O9ibyFtU2gYmn3BJKgM0zep6CF9&quot;\n</code></pre>\n<p>but when i trying to authenticate through localhost:8080/login i get <code>403</code> in <code>Network</code>. Authorizations server has empty log and gateway shows :</p>\n<p>No RouteDefinition found for [Exchange: GET http://localhost:8080/favicon.ico]</p>\n<p>Another glitch - when i follow the link with localhost:8080 - <a href=\"http://localhost:8080/oauth2/authorize?response_type=code&amp;client_id=gateway&amp;redirect_uri=http://localhost:8080/\" rel=\"nofollow noreferrer\">http://localhost:8080/oauth2/authorize?response_type=code&amp;client_id=gateway&amp;redirect_uri=http://localhost:8080/</a> browser redirects to localhost:9000/login</p>\n<pre class=\"lang-java prettyprint-override\"><code>//Auth2CloudGatewayApplication.java\nimport org.springframework.boot.SpringApplication;\nimport org.springframework.boot.autoconfigure.SpringBootApplication;\n\n@SpringBootApplication\npublic class Auth2CloudGatewayApplication {\n\n    public static void main(String[] args) {\n        SpringApplication.run(Auth2CloudGatewayApplication.class, args);\n    }\n\n}\n//GatewaySecurityConfig.java\nimport org.springframework.beans.factory.annotation.Value;\nimport org.springframework.context.annotation.Bean;\nimport org.springframework.context.annotation.Configuration;\nimport org.springframework.security.config.annotation.web.reactive.EnableWebFluxSecurity;\nimport org.springframework.security.config.web.server.ServerHttpSecurity;\nimport org.springframework.security.oauth2.core.DelegatingOAuth2TokenValidator;\nimport org.springframework.security.oauth2.core.OAuth2TokenValidator;\nimport org.springframework.security.oauth2.jwt.Jwt;\nimport org.springframework.security.oauth2.jwt.JwtValidators;\nimport org.springframework.security.oauth2.jwt.NimbusReactiveJwtDecoder;\nimport org.springframework.security.oauth2.jwt.ReactiveJwtDecoder;\nimport org.springframework.security.web.server.SecurityWebFilterChain;\nimport org.springframework.security.web.server.context.NoOpServerSecurityContextRepository;\n\nimport static org.springframework.security.config.Customizer.withDefaults;\n\n@Configuration\n@EnableWebFluxSecurity\npublic class GatewaySecurityConfig {\n    @Value(&quot;${provider.issuer-uri}/oauth2/jwks&quot;)\n    private String jwkSetUri;\n    @Value(&quot;${provider.issuer-uri}&quot;)\n    private String issuerUri;\n    @Bean\n    SecurityWebFilterChain defaultSecurityFilterChain(ServerHttpSecurity http) throws Exception {\n        http.securityContextRepository(NoOpServerSecurityContextRepository.getInstance())\n                .authorizeExchange(exchanges -&gt; {\n                    exchanges.pathMatchers(&quot;/login&quot;).permitAll();\n                    exchanges.pathMatchers(&quot;/oauth2/**&quot;).permitAll();\n                    exchanges.pathMatchers(&quot;/index.html&quot;).permitAll();\n                    exchanges.pathMatchers(&quot;/favicon.ico&quot;).permitAll();\n                    exchanges.pathMatchers(&quot;/assets/**&quot;).permitAll();\n                    exchanges.pathMatchers(&quot;/**&quot;).permitAll();\n                    exchanges.anyExchange().authenticated();\n                })\n                .oauth2ResourceServer(oauth2 -&gt; oauth2\n                        .jwt(\n                                withDefaults())\n                );\n        return http.build();\n    }\n\n    @Bean\n    public ReactiveJwtDecoder jwtDecoder() {\n        NimbusReactiveJwtDecoder jwtDecoder= NimbusReactiveJwtDecoder.withJwkSetUri(jwkSetUri).build();\n        OAuth2TokenValidator&lt;Jwt&gt; withIssuer = JwtValidators.createDefaultWithIssuer(issuerUri);\n        jwtDecoder.setJwtValidator(  new DelegatingOAuth2TokenValidator&lt;&gt;(withIssuer));//, withOperation)  );\n        return jwtDecoder;\n    }\n}\n//GatewayRoutesConfig.java\nimport org.springframework.beans.factory.annotation.Value;\nimport org.springframework.cloud.gateway.route.builder.RouteLocatorBuilder;\nimport org.springframework.cloud.gateway.route.RouteLocator;\nimport org.springframework.context.annotation.Bean;\nimport org.springframework.context.annotation.Configuration;\n\n@Configuration\n\npublic class GatewayRoutesConfig {\n    @Value(&quot;${provider.issuer-uri}&quot;)\n    String authorization_server;\n    @Bean\n    public RouteLocator gatewayRoutes(RouteLocatorBuilder routeLocatorBuilder)\n    {\n            return routeLocatorBuilder.routes()\n                    .route(&quot;login_page&quot;, rt -&gt; rt.path(&quot;/login/**&quot;)\n                            .filters(f -&gt; f.removeRequestHeader(&quot;Cookie&quot;)\n                                    .removeRequestHeader(&quot;Set-Cookie&quot;))\n                            .uri(authorization_server))\n                    .route(&quot;/oauth2_path&quot;, rt -&gt; rt.path(&quot;/oauth2/**&quot;)\n                            .uri(authorization_server))\n                    .route(&quot;tiktok_path&quot;, rt -&gt; rt.path(&quot;/tiktok/**&quot;)\n                            .uri(authorization_server))\n                    .build();\n    }\n}\n</code></pre>\n<pre class=\"lang-yaml prettyprint-override\"><code>#application.yml\nserver:\n  port: 8080\n\nspring:\n  web:\n    resources:\n      static-locations: classpath:/static/\n  security:\n    oauth2:\n      client:\n        registration:\n          gateway:\n            provider: spring\n            client-id: gateway\n            client-secret: secret\n            authorization-grant-type: authorization_code\n            redirect-uri: &quot;{baseUrl}/login/oauth2/code/{registrationId}&quot;\n            scope: openid,resource.read\n        provider:\n          spring:\n            issuer-uri: ${provider.issuer-uri}\n      resourceserver:\n        jwt:\n          issuer-uri: ${app.auth-server}\n\nlogging:\n  level:\n    root: INFO\n    org.springframework.security: trace\n    org.springframework.cloud.gateway.route.RouteDefinitionRouteLocator: INFO\n    org.springframework.cloud.gateway: trace\n    org.springframework.security.oauth2: trace\n\nprovider:\n  issuer-uri: http://localhost:9000\n\neureka:\n  defaultZoneUrl: http://u:p@localhost:8761/eureka/\n\napp:\n  auth-server: http://localhost:9000\n</code></pre>\n<p>and pom.xml for spring cloud gateway:</p>\n<pre class=\"lang-xml prettyprint-override\"><code>&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;\n&lt;project xmlns=&quot;http://maven.apache.org/POM/4.0.0&quot; xmlns:xsi=&quot;http://www.w3.org/2001/XMLSchema-instance&quot;\n         xsi:schemaLocation=&quot;http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd&quot;&gt;\n    &lt;modelVersion&gt;4.0.0&lt;/modelVersion&gt;\n    &lt;parent&gt;\n        &lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;\n        &lt;artifactId&gt;spring-boot-starter-parent&lt;/artifactId&gt;\n        &lt;version&gt;4.0.0&lt;/version&gt;\n        &lt;relativePath/&gt; &lt;!-- lookup parent from repository --&gt;\n    &lt;/parent&gt;\n    &lt;groupId&gt;com.forum&lt;/groupId&gt;\n    &lt;artifactId&gt;auth2_cloud_gateway&lt;/artifactId&gt;\n    &lt;version&gt;0.0.1-SNAPSHOT&lt;/version&gt;\n    &lt;name&gt;auth2_cloud_gateway&lt;/name&gt;\n    &lt;description&gt;auth2_cloud_gateway&lt;/description&gt;\n    \n    &lt;properties&gt;\n        &lt;java.version&gt;17&lt;/java.version&gt;\n        &lt;spring-cloud.version&gt;2025.1.0-RC1&lt;/spring-cloud.version&gt;\n    &lt;/properties&gt;\n    &lt;dependencies&gt;\n        &lt;dependency&gt;\n            &lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;\n            &lt;artifactId&gt;spring-boot-starter-security&lt;/artifactId&gt;\n        &lt;/dependency&gt;\n        &lt;dependency&gt;\n            &lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;\n            &lt;artifactId&gt;spring-boot-starter-security-oauth2-client&lt;/artifactId&gt;\n        &lt;/dependency&gt;\n        &lt;dependency&gt;\n            &lt;groupId&gt;org.springframework.cloud&lt;/groupId&gt;\n            &lt;artifactId&gt;spring-cloud-starter-gateway-server-webflux&lt;/artifactId&gt;\n        &lt;/dependency&gt;\n\n        &lt;dependency&gt;\n            &lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;\n            &lt;artifactId&gt;spring-boot-starter-security-oauth2-client-test&lt;/artifactId&gt;\n            &lt;scope&gt;test&lt;/scope&gt;\n        &lt;/dependency&gt;\n        &lt;dependency&gt;\n            &lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;\n            &lt;artifactId&gt;spring-boot-starter-security-test&lt;/artifactId&gt;\n            &lt;scope&gt;test&lt;/scope&gt;\n        &lt;/dependency&gt;\n        &lt;dependency&gt;\n            &lt;groupId&gt;io.projectreactor&lt;/groupId&gt;\n            &lt;artifactId&gt;reactor-test&lt;/artifactId&gt;\n            &lt;scope&gt;test&lt;/scope&gt;\n        &lt;/dependency&gt;\n        &lt;dependency&gt;\n            &lt;groupId&gt;org.springframework.security&lt;/groupId&gt;\n            &lt;artifactId&gt;spring-security-oauth2-resource-server&lt;/artifactId&gt;\n            &lt;!--&lt;version&gt;7.0.0&lt;/version&gt;--&gt;\n        &lt;/dependency&gt;\n    &lt;/dependencies&gt;\n    &lt;dependencyManagement&gt;\n        &lt;dependencies&gt;\n            &lt;dependency&gt;\n                &lt;groupId&gt;org.springframework.cloud&lt;/groupId&gt;\n                &lt;artifactId&gt;spring-cloud-dependencies&lt;/artifactId&gt;\n                &lt;version&gt;${spring-cloud.version}&lt;/version&gt;\n                &lt;type&gt;pom&lt;/type&gt;\n                &lt;scope&gt;import&lt;/scope&gt;\n            &lt;/dependency&gt;\n        &lt;/dependencies&gt;\n    &lt;/dependencyManagement&gt;\n    \n    &lt;build&gt;\n        &lt;plugins&gt;\n            &lt;plugin&gt;\n                &lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;\n                &lt;artifactId&gt;spring-boot-maven-plugin&lt;/artifactId&gt;\n            &lt;/plugin&gt;\n        &lt;/plugins&gt;\n    &lt;/build&gt;\n\n&lt;/project&gt;\n</code></pre>\n<p>and spring authorization server sources:</p>\n<pre class=\"lang-java prettyprint-override\"><code>//AuthorizationServerApplication.java\nimport org.springframework.boot.SpringApplication;\nimport org.springframework.boot.autoconfigure.SpringBootApplication;\n\n@SpringBootApplication\npublic class AuthorizationServerApplication {\n\n    public static void main(String[] args) {\n        SpringApplication.run(AuthorizationServerApplication.class, args);\n    }\n\n}\n\n\n//AuthorizationServerConfig.java\nimport com.nimbusds.jose.JOSEException;\nimport com.nimbusds.jose.jwk.JWKSet;\nimport com.nimbusds.jose.jwk.RSAKey;\nimport com.nimbusds.jose.jwk.source.JWKSource;\nimport com.nimbusds.jose.proc.SecurityContext;\n\n\n\nimport java.security.KeyPair;\nimport java.security.KeyPairGenerator;\nimport java.security.interfaces.RSAPrivateKey;\nimport java.security.interfaces.RSAPublicKey;\nimport java.time.Duration;\nimport java.time.temporal.ChronoUnit;\nimport java.util.Arrays;\nimport java.util.List;\nimport java.util.UUID;\nimport java.util.function.Consumer;\n\nimport static org.springframework.security.config.Customizer.withDefaults;\n\n@Configuration(proxyBeanMethods = false)\n@EnableWebSecurity\npublic class AuthorizationServerConfig {\n    private static final Logger LOG = LoggerFactory.getLogger(AuthorizationServerConfig.class);\n\n    @Value(&quot;${auth-provider.issuer-uri}&quot;)\n    private String issuer_uri;\n@Bean\n@Order(Ordered.HIGHEST_PRECEDENCE)\npublic SecurityFilterChain authorizationServerSecurityFilterChain(HttpSecurity http) throws Exception {\n    OAuth2AuthorizationServerConfigurer authorizationServerConfigurer =\n            new OAuth2AuthorizationServerConfigurer();\n    authorizationServerConfigurer\n            .authorizationEndpoint(authorizationEndpoint -&gt;\n                    authorizationEndpoint\n                            .authenticationProviders(configureAuthenticationValidator())\n            );\n    RequestMatcher endpointsMatcher = authorizationServerConfigurer\n            .getEndpointsMatcher();\n            http.securityMatcher(endpointsMatcher)\n            .authorizeHttpRequests(authorize -&gt;{\n                authorize.requestMatchers(&quot;/oauth2&quot;).permitAll();\n                authorize.requestMatchers(&quot;/login&quot;).permitAll();\n                    authorize.anyRequest().authenticated();\n            })\n            .apply(authorizationServerConfigurer);\n    http.getConfigurer(OAuth2AuthorizationServerConfigurer.class)\n            .oidc(Customizer.withDefaults()); // Enable OpenID Connect 1.0\n    http\n            .exceptionHandling(exceptions -&gt;\n                    exceptions.authenticationEntryPoint(new LoginUrlAuthenticationEntryPoint(&quot;/login&quot;))\n            )\n            .oauth2ResourceServer(oauth2 -&gt; oauth2\n            .jwt(withDefaults()));\n    WebMvcAutoConfiguration a=null;\n    return http.build();\n}\n\n    @Bean\n    public RegisteredClientRepository registeredClientRepository() {\n        RegisteredClient registeredClient = RegisteredClient.withId(UUID.randomUUID().toString())\n                .clientId(&quot;gateway&quot;)\n                .clientSecret(&quot;{noop}secret&quot;)\n                .clientAuthenticationMethod(ClientAuthenticationMethod.CLIENT_SECRET_BASIC)\n                .authorizationGrantType(AuthorizationGrantType.AUTHORIZATION_CODE)\n                .authorizationGrantType(AuthorizationGrantType.REFRESH_TOKEN)\n                .authorizationGrantType(AuthorizationGrantType.CLIENT_CREDENTIALS) // it was not heer\n                .redirectUri(&quot;http://localhost:8080/swagger-ui/index.html&quot;)\n                .scope(OidcScopes.OPENID)\n                .scope(&quot;resource.write&quot;)\n                .scope(&quot;resource.read&quot;)\n                .clientSettings(ClientSettings.builder().requireProofKey(false).build())\n                .tokenSettings(TokenSettings.builder()\n                        .accessTokenTimeToLive(Duration.of(60*24*140, ChronoUnit.MINUTES))\n                        .refreshTokenTimeToLive(Duration.of(120*24*140, ChronoUnit.MINUTES))\n                        .build())\n                .build();\n        return new InMemoryRegisteredClientRepository(registeredClient);\n    }@Bean\n    public UserDetailsService users() {\n        UserDetails user = User.withDefaultPasswordEncoder()\n                .username(&quot;admin&quot;)\n                .password(&quot;1&quot;)\n                .roles(&quot;ADMIN&quot;)\n                .build();\n\n        return new InMemoryUserDetailsManager(user);\n    }\n\n    @Bean\n    public JWKSet getJwkSet(){\n        RSAKey rsaKey = generateRsa();\n        JWKSet jwkSet = new JWKSet(rsaKey);\n        return jwkSet;\n    }\n    @Bean\n    public JWKSource&lt;SecurityContext&gt; jwkSource(JWKSet jwkSet) {\n\n\n        return (jwkSelector, securityContext) -&gt; jwkSelector.select(jwkSet);\n    }\n    @Bean\n    public JwtDecoder jwtDecoder(JWKSource&lt;SecurityContext&gt; jwkSource) {\n        return OAuth2AuthorizationServerConfiguration.jwtDecoder(jwkSource);\n    }\n    private static RSAKey generateRsa() {\n        KeyPair keyPair = generateRsaKey();\n        RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();\n        // delete next line if you can\n        System.out.println(&quot;Oper RSA key &quot;+keyPair.getPublic() );\n        RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();\n        return new RSAKey.Builder(publicKey)\n                .privateKey(privateKey)\n                .keyID(UUID.randomUUID().toString())\n                .build();\n    }\n\n    private static KeyPair generateRsaKey() {\n        KeyPair keyPair;\n        try {\n            KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance(&quot;RSA&quot;);\n            keyPairGenerator.initialize(2048);\n            keyPair = keyPairGenerator.generateKeyPair();\n        } catch (Exception ex) {\n            throw new IllegalStateException(ex);\n        }\n        return keyPair;\n    }\n    @Bean\n    public AuthorizationServerSettings authorizationServerSettings() {\n        return AuthorizationServerSettings.builder().issuer(issuer_uri).build();\n    }\n   /* @Bean\n    public ProviderSettings providerSettings() {\n        return ProviderSettings.builder()\n                .issuer(issuer_uri) //&quot;http://localhost:9000&quot;) ////\n                .build();\n    }*/\n\n    private Consumer&lt;List&lt;AuthenticationProvider&gt;&gt; configureAuthenticationValidator() {\n        return (authenticationProviders) -&gt;\n                authenticationProviders.forEach((authenticationProvider) -&gt; {\n                    if (authenticationProvider instanceof OAuth2AuthorizationCodeRequestAuthenticationProvider) {\n                        Consumer&lt;OAuth2AuthorizationCodeRequestAuthenticationContext&gt; authenticationValidator =\n                                // Override default redirect_uri validator\n                                new CustomRedirectUriValidator()\n                                        // Reuse default scope validator\n                                        .andThen(OAuth2AuthorizationCodeRequestAuthenticationValidator.DEFAULT_SCOPE_VALIDATOR);\n\n                        ((OAuth2AuthorizationCodeRequestAuthenticationProvider) authenticationProvider)\n                                .setAuthenticationValidator(authenticationValidator);\n                    }\n                });\n    }\n    static class CustomRedirectUriValidator implements Consumer&lt;OAuth2AuthorizationCodeRequestAuthenticationContext&gt; {\n\n        @Override\n        public void accept(OAuth2AuthorizationCodeRequestAuthenticationContext authenticationContext) {\n            OAuth2AuthorizationCodeRequestAuthenticationToken authorizationCodeRequestAuthentication =\n                    authenticationContext.getAuthentication();\n            RegisteredClient registeredClient = authenticationContext.getRegisteredClient();\n            String requestedRedirectUri = authorizationCodeRequestAuthentication.getRedirectUri();\n\n            LOG.trace(&quot;Will validate the redirect uri {}&quot;, requestedRedirectUri);\n\n            // Use exact string matching when comparing client redirect URIs against pre-registered URIs\n            if (!registeredClient.getRedirectUris().contains(requestedRedirectUri)) {\n                LOG.trace(&quot;Redirect uri is invalid!&quot;);\n                OAuth2Error error = new OAuth2Error(OAuth2ErrorCodes.INVALID_REQUEST);\n//ithing i dont need it                throw new OAuth2AuthorizationCodeRequestAuthenticationException(error, null); //i think i dont need IT\n            }\n            LOG.trace(&quot;Redirect uri is OK!&quot;);\n        }\n    }\n\n    @Bean //https://stackoverflow.com/questions/36809528/spring-boot-cors-filter-cors-preflight-channel-did-not-succeed\n    public CorsConfigurationSource corsConfigurationSource() {\n        CorsConfiguration configuration = new CorsConfiguration();\n        configuration.setAllowedOrigins(Arrays.asList(&quot;*&quot;));\n        configuration.setAllowedMethods(Arrays.asList(&quot;GET&quot;, &quot;POST&quot;, &quot;PUT&quot;, &quot;PATCH&quot;, &quot;DELETE&quot;, &quot;OPTIONS&quot;));\n        configuration.setAllowCredentials(true);\n        configuration.setAllowedHeaders(Arrays.asList(&quot;*&quot;));\n        configuration.setAllowedHeaders(Arrays.asList(&quot;authorization&quot;, &quot;content-type&quot;, &quot;x-auth-token&quot;));\n        configuration.setExposedHeaders(Arrays.asList(&quot;x-auth-token&quot;));\n        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();\n        source.registerCorsConfiguration(&quot;/**&quot;, configuration);\n        LOG.error(&quot;CorsConfigurationSource corsConfigurationSource&quot;);\n        return source;\n    }\n\n    @Bean\n    public WebMvcConfigurer corsConfigurer() {\n        return new WebMvcConfigurer() {\n            @Override\n            public void addCorsMappings(CorsRegistry registry) {\n                registry.addMapping(&quot;/**&quot;).allowedOrigins(&quot;http://localhost:3000&quot;);\n                LOG.error(&quot;Cors Mapping from configurer&quot;);\n            }\n        };\n    }\n}\n//DefaultSecurityConfig.java\n\n@Configuration\n@EnableWebSecurity\npublic class DefaultSecurityConfig {\n    @Bean\n    SecurityFilterChain defaultSecurityFilterChain(HttpSecurity http) throws Exception {\n        http\n                .csrf(CsrfConfigurer::disable)\n                .authorizeHttpRequests(authorizeRequests -&gt; {\n                            authorizeRequests.requestMatchers(&quot;/index.html&quot;).permitAll();\n                            authorizeRequests.requestMatchers(&quot;/favicon.ico&quot;).permitAll();\n                            authorizeRequests.requestMatchers(&quot;/assets/**&quot;).permitAll();\n                            authorizeRequests.requestMatchers(&quot;/jwks&quot;).permitAll();\n                            authorizeRequests.requestMatchers(&quot;/oauth2&quot;).permitAll();\n                            authorizeRequests.requestMatchers(&quot;/oauth2/**&quot;).permitAll();\n                            authorizeRequests.requestMatchers(&quot;/login&quot;).permitAll();\n                            authorizeRequests.requestMatchers(&quot;/**&quot;).permitAll();\n                            authorizeRequests\n                                    .anyRequest()\n                                    .authenticated();\n                        }\n                );\n        http\n                .formLogin(withDefaults());\n        return http.build();\n    }\n    @Bean\n    public PasswordEncoder passwordEncoder() {\n        PasswordEncoder PASSWORD_ENCODER = PasswordEncoderFactories.createDelegatingPasswordEncoder();\n        return PASSWORD_ENCODER;\n    }\n}\n//JwkKeyEndpoint.java\nimport com.nimbusds.jose.jwk.JWK;\nimport com.nimbusds.jose.jwk.JWKSet;\nimport org.springframework.beans.factory.annotation.Autowired;\nimport org.springframework.web.bind.annotation.GetMapping;\nimport org.springframework.web.bind.annotation.ResponseBody;\nimport org.springframework.web.bind.annotation.RestController;\n\nimport java.util.*;\n\n@RestController\npublic class JwkKeyEndpoint {\n    @Autowired\n    private JWKSet jwkSet;\n\n    @GetMapping(&quot;/jwks&quot;)\n    @ResponseBody\n    public String getKey() {\n        jwkSet.toPublicJWKSet().getKeys();\n        List&lt;JWK&gt; jwkValueList = jwkSet.toPublicJWKSet().getKeys();\n        return jwkValueList.get(0).toString();\n    }\n}\n</code></pre>\n<pre class=\"lang-yaml prettyprint-override\"><code>#application.yml\nserver:\n  port: 9000\nlogging:\n  level:\n    #root: TRACE\n    org.springframework.security: trace\napplication.localhost-path: localhost\n\nauth-provider:\n  issuer-uri: &quot;http://localhost:9000&quot;\nauth-server:\n  get-jwk-link: &quot;http://localhost:9000/jwks&quot;\nspring:\n  security:\n    oauth2:\n      resourceserver:\n        jwt:\n          issuer-uri: http://${application.localhost-path}:9000\n</code></pre>\n<p>and pom.xml for spring authorization server:</p>\n<pre class=\"lang-xml prettyprint-override\"><code>&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;\n&lt;project xmlns=&quot;http://maven.apache.org/POM/4.0.0&quot; xmlns:xsi=&quot;http://www.w3.org/2001/XMLSchema-instance&quot;\n         xsi:schemaLocation=&quot;http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd&quot;&gt;\n    &lt;modelVersion&gt;4.0.0&lt;/modelVersion&gt;\n\n    &lt;parent&gt;\n        &lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;\n        &lt;artifactId&gt;spring-boot-starter-parent&lt;/artifactId&gt;\n        &lt;version&gt;4.0.0&lt;/version&gt; &lt;!-- was 3.0.4 --&gt;\n        &lt;relativePath/&gt; &lt;!-- lookup parent from repository 2.7.5 --&gt;\n    &lt;/parent&gt;\n\n    &lt;groupId&gt;com.forum&lt;/groupId&gt;\n    &lt;artifactId&gt;authorization-server&lt;/artifactId&gt;\n    &lt;version&gt;0.0.1-SNAPSHOT&lt;/version&gt;\n    &lt;name&gt;authorization-server&lt;/name&gt;\n    &lt;description&gt;authorization-server&lt;/description&gt;\n\n    &lt;properties&gt;\n        &lt;java.version&gt;17&lt;/java.version&gt;\n        &lt;spring-cloud.version&gt;2025.0.0&lt;/spring-cloud.version&gt;&lt;!-- 2022.0.1 --&gt;\n        &lt;spring-auth-server.version&gt;7.0.0&lt;/spring-auth-server.version&gt;&lt;!-- 1.0.0 but was 0.3.1 --&gt;\n    &lt;/properties&gt;\n\n    &lt;dependencies&gt;\n        &lt;!--   --&gt;&lt;dependency&gt;\n            &lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;\n            &lt;artifactId&gt;spring-boot-starter-security&lt;/artifactId&gt;\n        &lt;/dependency&gt;\n        &lt;dependency&gt;\n            &lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;\n            &lt;artifactId&gt;spring-boot-starter-web&lt;/artifactId&gt;\n        &lt;/dependency&gt;\n        &lt;dependency&gt;\n            &lt;groupId&gt;org.springframework.security&lt;/groupId&gt;\n            &lt;artifactId&gt;spring-security-oauth2-authorization-server&lt;/artifactId&gt;\n            &lt;version&gt;${spring-auth-server.version}&lt;/version&gt;\n        &lt;/dependency&gt;\n        &lt;dependency&gt;\n            &lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;\n            &lt;artifactId&gt;spring-boot-autoconfigure&lt;/artifactId&gt;\n\n        &lt;/dependency&gt;&lt;!-- --&gt;&lt;!-- added in boot 4.0.0 --&gt;\n\n        &lt;dependency&gt;\n            &lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;\n            &lt;artifactId&gt;spring-boot-starter-test&lt;/artifactId&gt;\n            &lt;scope&gt;test&lt;/scope&gt;\n        &lt;/dependency&gt;\n        &lt;dependency&gt;\n            &lt;groupId&gt;org.springframework.security&lt;/groupId&gt;\n            &lt;artifactId&gt;spring-security-test&lt;/artifactId&gt;\n            &lt;scope&gt;test&lt;/scope&gt;\n        &lt;/dependency&gt;\n        &lt;!--&lt;dependency&gt;\n            &lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;\n            &lt;artifactId&gt;spring-boot-starter-data-jpa&lt;/artifactId&gt;\n        &lt;/dependency&gt;--&gt;\n        &lt;dependency&gt;\n            &lt;groupId&gt;org.projectlombok&lt;/groupId&gt;\n            &lt;artifactId&gt;lombok&lt;/artifactId&gt;\n            &lt;version&gt;1.18.42&lt;/version&gt;&lt;!-- was 1.18.30 --&gt;\n            &lt;scope&gt;provided&lt;/scope&gt;\n        &lt;/dependency&gt;\n&lt;!--        &lt;dependency&gt;\n            &lt;groupId&gt;com.h2database&lt;/groupId&gt;\n            &lt;artifactId&gt;h2&lt;/artifactId&gt;\n            &lt;scope&gt;runtime&lt;/scope&gt;\n            &lt;version&gt;1.4.199&lt;/version&gt;\n        &lt;/dependency&gt;--&gt;\n        &lt;dependency&gt;\n            &lt;groupId&gt;org.postgresql&lt;/groupId&gt;\n            &lt;artifactId&gt;postgresql&lt;/artifactId&gt;\n&lt;!--            &lt;version&gt;42.7.5&lt;/version&gt;  --&gt;\n        &lt;/dependency&gt;\n\n        &lt;dependency&gt;\n        &lt;groupId&gt;org.hibernate&lt;/groupId&gt;\n        &lt;artifactId&gt;hibernate-core&lt;/artifactId&gt;\n               &lt;version&gt;7.0.10.Final&lt;/version&gt; &lt;!--was 6.5.3.Final; but before it was empty version --&gt;\n        &lt;/dependency&gt;\n       \n        &lt;dependency&gt;\n            &lt;groupId&gt;io.jsonwebtoken&lt;/groupId&gt;\n            &lt;artifactId&gt;jjwt-api&lt;/artifactId&gt;\n            &lt;version&gt;0.12.6&lt;/version&gt;\n            &lt;!--     --&gt;    &lt;scope&gt;compile&lt;/scope&gt;\n        &lt;/dependency&gt; &lt;!--  --&gt;\n        &lt;dependency&gt;\n            &lt;groupId&gt;io.jsonwebtoken&lt;/groupId&gt;\n            &lt;artifactId&gt;jjwt-impl&lt;/artifactId&gt;\n            &lt;version&gt;0.12.6&lt;/version&gt;\n            &lt;scope&gt;runtime&lt;/scope&gt;\n        &lt;/dependency&gt;\n        &lt;dependency&gt;\n            &lt;groupId&gt;io.jsonwebtoken&lt;/groupId&gt;\n            &lt;artifactId&gt;jjwt-jackson&lt;/artifactId&gt;\n            &lt;version&gt;0.12.6&lt;/version&gt;\n            &lt;scope&gt;runtime&lt;/scope&gt;\n        &lt;/dependency&gt;\n\n        &lt;dependency&gt;\n            &lt;groupId&gt;org.springframework.security&lt;/groupId&gt;\n            &lt;artifactId&gt;spring-security-config&lt;/artifactId&gt;\n        &lt;/dependency&gt;\n        &lt;dependency&gt;\n            &lt;groupId&gt;commons-logging&lt;/groupId&gt;\n            &lt;artifactId&gt;commons-logging&lt;/artifactId&gt;\n            &lt;version&gt;1.3.5&lt;/version&gt;\n        &lt;/dependency&gt;&lt;!-- because of boot 4.0.0 --&gt;\n    &lt;/dependencies&gt;\n    &lt;dependencyManagement&gt;\n        &lt;dependencies&gt;\n            &lt;dependency&gt;\n                &lt;groupId&gt;org.springframework.cloud&lt;/groupId&gt;\n                &lt;artifactId&gt;spring-cloud-dependencies&lt;/artifactId&gt;\n                &lt;version&gt;${spring-cloud.version}&lt;/version&gt;\n                &lt;type&gt;pom&lt;/type&gt;\n                &lt;scope&gt;import&lt;/scope&gt;\n            &lt;/dependency&gt;\n        &lt;/dependencies&gt;\n    &lt;/dependencyManagement&gt;\n    \n    &lt;build&gt;\n        &lt;plugins&gt;\n            &lt;plugin&gt;\n                &lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;\n                &lt;artifactId&gt;spring-boot-maven-plugin&lt;/artifactId&gt;\n            &lt;/plugin&gt;\n\n            &lt;!--&lt;plugin&gt;\n            &lt;groupId&gt;org.apache.maven.plugins&lt;/groupId&gt;\n            &lt;artifactId&gt;maven-resources-plugin&lt;/artifactId&gt;\n                &lt;version&gt;3.3.1&lt;/version&gt;\n                &lt;configuration&gt;\n\n                    &lt;nonFilteredFileExtensions&gt;\n                        &lt;nonFilteredFileExtension&gt;esbuild&lt;/nonFilteredFileExtension&gt;\n                        &lt;nonFilteredFileExtension&gt;swf&lt;/nonFilteredFileExtension&gt;\n                    &lt;/nonFilteredFileExtensions&gt;\n\n                &lt;/configuration&gt;\n            &lt;executions&gt;\n                &lt;execution&gt;\n                    &lt;id&gt;Copy my VueJS app into my Spring Boot target static\n                        folder\n                    &lt;/id&gt;\n                    &lt;phase&gt;process-resources&lt;/phase&gt;\n                    &lt;goals&gt;\n                        &lt;goal&gt;copy-resources&lt;/goal&gt;\n                    &lt;/goals&gt;\n                    &lt;configuration&gt;\n                        &lt;outputDirectory&gt;target/classes/static&lt;/outputDirectory&gt;\n                        &lt;resources&gt;\n                            &lt;resource&gt;\n                                &lt;directory&gt;/home/user/Downloads/vscode/BuildingRealWorldVue3/vue-3-pinia-jwt-authentication-example-master/dist&lt;/directory&gt;\n                                &lt;filtering&gt;true&lt;/filtering&gt;\n                            &lt;/resource&gt;\n                        &lt;/resources&gt;\n                    &lt;/configuration&gt;\n                &lt;/execution&gt;\n            &lt;/executions&gt;\n        &lt;/plugin&gt;--&gt;\n\n        &lt;/plugins&gt;\n    &lt;/build&gt;\n\n&lt;/project&gt;\n</code></pre>\n"
  }, {
    "tags" : [ "java", "eclipse", "maven", "m2eclipse" ],
    "owner" : {
      "account_id" : 25738922,
      "reputation" : 21,
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      "profile_image" : "https://www.gravatar.com/avatar/22c741b4dff580c3bf5420e4782fe234?s=256&d=identicon&r=PG",
      "display_name" : "toreitc",
      "link" : "https://stackoverflow.com/users/19493204/toreitc"
    },
    "is_answered" : false,
    "view_count" : 93,
    "answer_count" : 0,
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    "last_activity_date" : 1764586425,
    "creation_date" : 1764259797,
    "last_edit_date" : 1764586425,
    "question_id" : 79831901,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79831901/m2e-workspace-resolution-broken-after-upgrading-from-eclipse-2021-to-2025",
    "title" : "m2e Workspace Resolution Broken After Upgrading from Eclipse 2021 to 2025",
    "body" : "<p>I’m upgrading an old Eclipse setup and ran into a strange issue with m2e workspace resolution.</p>\n<p>I moved from <strong>Eclipse 2021</strong> to <strong>Eclipse 2025</strong>.<br />\nI created a completely clean Eclipse installation and workspace, imported all my projects, and installed all required plugins.</p>\n<p>However, I now have this problem:</p>\n<ul>\n<li><p>Project A has a Maven dependency on Project B (declared in A's pom.xml)</p>\n</li>\n<li><p>If Project B is open in the workspace, then Project A cannot resolve imports or references to Project B</p>\n</li>\n<li><p>If Project B is closed, then Project A compiles fine (but now under Maven Dependencies the jar of Project B is present, not the project folder)</p>\n</li>\n<li><p>If I disable &quot;Resolve dependencies from workspace projects&quot; in Project A it also works, but this slows down development, as I have to build Project B after each change for Project A to pick up the changes.</p>\n</li>\n</ul>\n<p>So workspace resolution itself seems broken.</p>\n<p>Edit: I have tried updating maven projects (Alt + f5) and cleaning repeatedly and I have an external maven installation configured. The errors I see are both in the code itself, and in the problems view of eclipse. I am not using code generation.</p>\n"
  }, {
    "tags" : [ "java", "visual-studio-code", "vscode-extensions" ],
    "owner" : {
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      "display_name" : "Hamza Belmellouki",
      "link" : "https://stackoverflow.com/users/7968673/hamza-belmellouki"
    },
    "is_answered" : false,
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    "last_edit_date" : 1764262110,
    "question_id" : 79831892,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79831892/how-to-copy-a-fully-qualified-method-reference-in-vs-code-like-intellij-s-copy",
    "title" : "How to copy a fully qualified method reference in VS Code (like IntelliJ’s &quot;Copy Reference&quot;)?",
    "body" : "<p>I’m coming from IntelliJ and I’m used to the “Copy Reference” feature, which lets me copy a fully qualified reference to a method, such as:</p>\n<pre><code>com.mycompany.project.service.UserService.getUserById\n</code></pre>\n<p>I’m trying to do the same in VS Code but haven’t found any built-in feature or working extension.</p>\n<p>I'm using Cursor, but I assume it's the same as VSCode.</p>\n<p>Is there any way (extension, setting, command) to copy a fully qualified method reference in VS Code for Java?<br />\nIf not, is there a known workaround?</p>\n"
  }, {
    "tags" : [ "java", "concurrency", "thread-synchronization" ],
    "owner" : {
      "account_id" : 218143,
      "reputation" : 225,
      "user_id" : 474323,
      "user_type" : "registered",
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      "profile_image" : "https://www.gravatar.com/avatar/851b7fa17e397da1ccbd23071404e749?s=256&d=identicon&r=PG",
      "display_name" : "Kannan J",
      "link" : "https://stackoverflow.com/users/474323/kannan-j"
    },
    "is_answered" : false,
    "view_count" : 66,
    "answer_count" : 1,
    "score" : 1,
    "last_activity_date" : 1764676052,
    "creation_date" : 1764256793,
    "question_id" : 79831835,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79831835/need-help-understanding-why-this-locksupport-park-hangs-indefinitely",
    "title" : "Need help understanding why this Locksupport.park hangs indefinitely",
    "body" : "<p>I have the below code (whole code is <a href=\"https://github.com/grpc/grpc-java/blob/master/stub/src/main/java/io/grpc/stub/ClientCalls.java\" rel=\"nofollow noreferrer\">here</a>) that polls a queue for runnables and parks itself if the queue is empty.</p>\n<pre><code>public void waitAndDrain() throws InterruptedException {\n  throwIfInterrupted();\n  Runnable runnable = poll();\n  if (runnable == null) {\n    waiter = Thread.currentThread();\n    try {\n      while ((runnable = poll()) == null) {\n        LockSupport.park(this);\n        throwIfInterrupted();\n      }\n    } finally {\n      waiter = null;\n    }\n  }\n  do {\n    runQuietly(runnable);\n  } while ((runnable = poll()) != null);\n}\n</code></pre>\n<p>And the code that does unpark</p>\n<pre><code>public void execute(Runnable runnable) {\n  add(runnable);\n  Object waiter = this.waiter;\n  if (waiter != SHUTDOWN) {\n    LockSupport.unpark((Thread) waiter); // no-op if null\n  } else if (remove(runnable) &amp;&amp; rejectRunnableOnExecutor) {\n    throw new RejectedExecutionException();\n  }\n}\n</code></pre>\n<p>If unparks happen in succession, the lost permits are not a problem because the code that unparks also enqueues runnables, and the reader code only parks itself if the queue is not empty.\nBefore you point me to the &quot;else if&quot; block in the unpacking code that looks suspicious, let me point out that this is not an issue, for the &quot;waitor&quot; variable is only ever set to SHUTDOWN <a href=\"https://github.com/grpc/grpc-java/blob/02e98a806d4738a113519115d55fc242243e98d6/stub/src/main/java/io/grpc/stub/ClientCalls.java#L173C16-L173C24\" rel=\"nofollow noreferrer\">here</a> (could have been a private method, need not have been public) after the loop that polls the queue terminates, so if it set the waitor to SHUTDOWN, there is no chance of parking again.\nHowever our customer has reported that occasionally the application gets stuck with the parking thread waiting in the parked state:</p>\n<pre><code>    &quot;Test worker&quot; #1 prio=5 os_prio=0 cpu=68854.65ms elapsed=51528.48s tid=0x0000ffffb40311a0 nid=0x321d1c waiting on condition  [0x0000ffffb99fb000]\n   java.lang.Thread.State: WAITING (parking)\n    at jdk.internal.misc.Unsafe.park(java.base@17.0.15/Native Method)\n    - parking to wait for  &lt;0x00000000d69d5a18&gt; (a io.xxxx.stub.ClientCalls$ThreadlessExecutor)\n    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:211)\n    at io.xxxx.stub.ClientCalls$ThreadlessExecutor.waitAndDrain(ClientCalls.java:817)\n    at io.xxxx.stub.ClientCalls.blockingUnaryCall(ClientCalls.java:166)\n    ...\n</code></pre>\n<p>I have been splitting hairs unable to come up with a scenario that could cause this. Any idea is much appreciated.</p>\n"
  }, {
    "tags" : [ "java", "asynchronous", "quarkus", "mdc" ],
    "owner" : {
      "account_id" : 1118925,
      "reputation" : 906,
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      "profile_image" : "https://www.gravatar.com/avatar/c14df8dbad134e6c0da86300b28d1352?s=256&d=identicon&r=PG",
      "display_name" : "Daniel",
      "link" : "https://stackoverflow.com/users/1107657/daniel"
    },
    "is_answered" : false,
    "view_count" : 38,
    "answer_count" : 0,
    "score" : 0,
    "last_activity_date" : 1764255014,
    "creation_date" : 1764255014,
    "question_id" : 79831810,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79831810/losing-mdc-in-quarkus-managedexecutor",
    "title" : "Losing MDC in Quarkus ManagedExecutor",
    "body" : "<p>I'm starting an async-process through a REST request. As soon as the REST requests returns, I'm losing the MDC context inside my async execution code. I tried to &quot;copy&quot; it over with ThreadContext but it does not work. Also, manually copying it over didn't do the trick. Somehow MDC gets cleared after the outer REST request returns.</p>\n<pre><code>Map&lt;String, String&gt; copyOfContextMap = MDC.getCopyOfContextMap();\n\nThreadContext threadContext = ThreadContext.builder()\n    .propagated(ThreadContext.ALL_REMAINING)\n    .cleared()\n    .build();\nRunnable runnable = threadContext.contextualRunnable(() -&gt; {\n  try {\n\n    MDC.setContextMap(copyOfContextMap);\n    latch.countDown();\n\n    for (int i = 0; i &lt; 10; i++) {\n      log.info(i + &quot;: Log inside async executor&quot;);\n      sleepQuietly();\n    }\n  } catch (Throwable e) {\n    log.error(&quot;Error during async execution&quot;, e);\n  }\n});\n\nexecutor.runAsync(runnable);\n</code></pre>\n<p>How can I preserve my MDC context from the asynchronous executed thread? I see it's there during the first log lines, when the outer request hasn't returned but afterwards seems to get cleared.</p>\n"
  }, {
    "tags" : [ "java", "android", "kotlin", "gradle" ],
    "owner" : {
      "account_id" : 44826251,
      "reputation" : 1,
      "user_id" : 31955881,
      "user_type" : "registered",
      "profile_image" : "https://www.gravatar.com/avatar/6bd1b9b0427938a8a6a6a8d0800bb6b0?s=256&d=identicon&r=PG&f=y&so-version=2",
      "display_name" : "sii desarrollo2",
      "link" : "https://stackoverflow.com/users/31955881/sii-desarrollo2"
    },
    "is_answered" : false,
    "view_count" : 68,
    "answer_count" : 0,
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    "last_activity_date" : 1764250573,
    "creation_date" : 1764250573,
    "question_id" : 79831753,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79831753/error-sun-security-validator-validatorexception-pkix-path-building-failed-sun",
    "title" : "Error: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException:",
    "body" : "<p>I'm using an old version of Android Studio, 3.1.6.</p>\n<p>This error appears when the gradle project sync failed. I also have a new version of android studio installed, I dont know if this could be related, I have apps in both versions.</p>\n<p>Here i pasted part of the error because is longer but it's the same error but with another url.</p>\n<p>I pasted another screenshots of my gradle version, I'm not an expert so i dont know if it's all the info I should give.</p>\n<p><a href=\"https://i.sstatic.net/9QNzJQGK.png\" rel=\"nofollow noreferrer\">Build.Gradle screenshot</a></p>\n<p><a href=\"https://i.sstatic.net/lCCbcD9F.png\" rel=\"nofollow noreferrer\">Android Gradle Plugin Version</a></p>\n<pre><code>&gt; Could not resolve all artifacts for configuration ':classpath'.\n   &gt; Could not resolve org.jetbrains.kotlin:kotlin-gradle-plugin:1.3.72.\n     Required by:\n         project :\n      &gt; Could not resolve org.jetbrains.kotlin:kotlin-gradle-plugin:1.3.72.\n         &gt; Could not get resource 'https://repo.maven.apache.org/maven2/org/jetbrains/kotlin/kotlin-gradle-plugin/1.3.72/kotlin-gradle-plugin-1.3.72.pom'.\n            &gt; Could not HEAD 'https://repo.maven.apache.org/maven2/org/jetbrains/kotlin/kotlin-gradle-plugin/1.3.72/kotlin-gradle-plugin-1.3.72.pom'.\n               &gt; sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target\n   &gt; Could not resolve org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.20.\n     Required by:\n         project : &gt; com.android.tools.build:gradle:3.3.1\n         project : &gt; com.android.tools.build:gradle:3.3.1 &gt; com.android.tools.build:builder:3.3.1\n         project : &gt; com.android.tools.build:gradle:3.3.1 &gt; com.android.tools.analytics-library:shared:26.3.1\n         project : &gt; com.android.tools.build:gradle:3.3.1 &gt; com.android.tools.lint:lint-gradle-api:26.3.1\n         project : &gt; com.android.tools.build:gradle:3.3.1 &gt; com.android.tools.build:gradle-api:3.3.1\n         project : &gt; com.android.tools.build:gradle:3.3.1 &gt; androidx.databinding:databinding-compiler-common:3.3.1\n         project : &gt; com.android.tools.build:gradle:3.3.1 &gt; com.android.tools.build:builder:3.3.1 &gt; com.android.tools:sdk-common:26.3.1\n         project : &gt; com.android.tools.build:gradle:3.3.1 &gt; com.android.tools.build:builder:3.3.1 &gt; com.android.tools:common:26.3.1\n         project : &gt; com.android.tools.build:gradle:3.3.1 &gt; com.android.tools.build:builder:3.3.1 &gt; com.android.tools.build:manifest-merger:26.3.1\n         project : &gt; com.android.tools.build:gradle:3.3.1 &gt; com.android.tools.build:builder:3.3.1 &gt; com.android.tools.analytics-library:tracker:26.3.1\n         project : &gt; com.android.tools.build:gradle:3.3.1 &gt; com.android.tools.build:builder:3.3.1 &gt; com.android.tools:sdklib:26.3.1 &gt; com.android.tools:repository:26.3.1\n      &gt; Could not resolve org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.3.20.\n         &gt; Could not get resource 'https://repo.maven.apache.org/maven2/org/jetbrains/kotlin/kotlin-stdlib-jdk8/1.3.20/kotlin-stdlib-jdk8-1.3.20.pom'.\n            &gt; Could not GET 'https://repo.maven.apache.org/maven2/org/jetbrains/kotlin/kotlin-stdlib-jdk8/1.3.20/kotlin-stdlib-jdk8-1.3.20.pom'.\n               &gt; sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target\n</code></pre>\n"
  }, {
    "tags" : [ "java", "eclipse", "cmd", "classpath", "processbuilder" ],
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    "is_answered" : false,
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    "last_activity_date" : 1764602053,
    "creation_date" : 1764247727,
    "question_id" : 79831723,
    "content_license" : "CC BY-SA 4.0",
    "link" : "https://stackoverflow.com/questions/79831723/command-is-either-misspelled-or-could-not-be-found-with-win-11-but-not-win-10",
    "title" : "&quot;command is either misspelled or could not be found&quot; with Win 11 but not Win 10",
    "body" : "<p>A year ago I created an Eclipse project (Eclipse 2020-06, Java 8, Win 10) that uses the GIS LAStools libary to e.g. extract data from a couple of files.</p>\n<p>I'm now using Win 11 on a different PC and want to work on the project again, so I copied the old project, installed the same Java version, the same Eclipse version (with the same settings, as far as I've seen) and the same library version.</p>\n<p>My code:</p>\n<pre><code>Process p = null;\nArrayList&lt;String&gt; lines = new ArrayList&lt;String&gt;();\nString lasbinpath = &quot;somepath\\\\LAStools\\\\bin&quot;;\nString command = &quot;lasindex64 -i someotherpath\\\\myfile.laz&quot;;\n\ntry {\n    ProcessBuilder builder = new ProcessBuilder(&quot;cmd.exe&quot;, &quot;/c&quot;, command);\n    Map&lt;String, String&gt; env = builder.environment();\n    env.put(&quot;path&quot;, lasbinpath);\n    builder.redirectErrorStream(true);\n    p = builder.start();\n    BufferedReader br = new BufferedReader(new InputStreamReader(p.getInputStream()));\n    String line;\n\n    while(true) {\n        line = br.readLine();\n        if (line==null) { break; }\n        lines.add(line);\n    }\n    br.close();\n} catch(IOException e) {\n    e.printStackTrace();\n} finally {\n    if(p!=null) { p.destroy(); }\n}\n</code></pre>\n<p>When I try to run it, there's always the same error:</p>\n<pre><code>The &quot;DOSKEY&quot; command is either misspelled or could not be found.\n</code></pre>\n<p>At first I thought that it might be the library's fault and started a <a href=\"https://gis.stackexchange.com/q/498138/148791\">question</a> in the GIS stackexchange.</p>\n<p>Yesterday I started up the old Win 10 PC again and the same code is still working fine there, even with the latest version of the library.</p>\n<p>On Win 11 the same error appears when I run the code in Eclipse 2025-09 with OpenJDK 24 (even when run as admin) but there's no error when I run the library's command directly in command prompt. The &quot;doskey.exe&quot; file does exist in the &quot;System32&quot; folder and while the &quot;Windows&quot; and &quot;System32&quot; folders are protected, of course, I can manually access them without any problems. Other (native) commands like <code>java -version</code> and <code>dir</code> work fine with my code.</p>\n<p>If I remove <code>env.put(&quot;path&quot;, lasbinpath)</code> and manually add the path to <code>PATH</code> instead, there's no more error and the code is working as expected.</p>\n<p>I know that Win 11 can be weird about permissions and I've had problems with those before (app that was working fine on Win 10 can't access files in Win 11, unless run as admin), so I think that this is the case here too.</p>\n<p>There are a couple of google search results about things not working as expected on Win 11, compared to Win 10 (not just with Java) but nothing about the <code>ProcessBuilder</code>. Is there a specific way I have to set up Eclipse and/or <code>ProcessBuilder</code> to give them access and work with a temporary <code>PATH</code>?</p>\n"
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