upped to Java 13

Author: verhas

.travis.yml

@@ -1,6 +1,9 @@
 language: java
-install: mvn clean install
+install: mvn install -Dmaven.javadoc.skip=true
+dist: xenial
 jdk:
  - openjdk11
+ - openjdk12
+ - openjdk13
 
 sudo: false # faster builds

pom.xml

@@ -67,9 +67,10 @@
                 <artifactId>maven-compiler-plugin</artifactId>
                 <version>3.8.1</version>
                 <configuration>
-                    <release>11</release>
-                    <source>11</source>
-                    <target>11</target>
+                    <compilerArgs>--enable-preview</compilerArgs>
+                    <release>13</release>
+                    <source>13</source>
+                    <target>13</target>
                 </configuration>
             </plugin>
             <plugin>
@@ -89,7 +90,18 @@
             </plugin>
             <plugin>
                 <artifactId>maven-surefire-plugin</artifactId>
-                <version>3.0.0-M3</version>
+                <version>3.0.0-M4</version>
+                <configuration>
+                    <argLine>--enable-preview</argLine>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <source>13</source>
+                    <target>13</target>
+                </configuration>
             </plugin>
         </plugins>
     </build>

src/test/java/com/scriptbasic/TestEngine.java

@@ -280,9 +280,10 @@ public void testRegisterExtension() throws Exception {
         // START SNIPPET: testExtensionMethod
         final var engine = ScriptBasic
                 .engine()
-                .load("Sub aPie\n" +
-                        "return javaFunction()\n" +
-                        "EndSub\n")
+                .load("""
+                        Sub aPie
+                        return javaFunction()
+                        EndSub""")
                 .registerExtension(TestExtensionClass.class)
                 .execute();
         final var z = engine.subroutine(Long.class, "aPie").call();