build: require jdk 17+

Author: hauner

.github/workflows/build.yaml

@@ -83,7 +83,7 @@ jobs:
       with:
         distribution: 'temurin'
         java-version: |
-          11
+          17
           21
 
     - name: set up gradle
@@ -128,7 +128,7 @@ jobs:
       with:
         distribution: 'temurin'
         java-version: |
-          11
+          17
           21
 
     - name: set up gradle
@@ -171,7 +171,7 @@ jobs:
       with:
         distribution: 'temurin'
         java-version: |
-          11
+          17
           21
 
     - name: set up gradle

.github/workflows/release.yaml

@@ -20,7 +20,7 @@ jobs:
         with:
           distribution: 'temurin'
           java-version: |
-            11
+            17
             21
 
       - name: set up gradle

README.adoc

@@ -26,8 +26,9 @@ It is usable, it is used as the internal openapi parser/validator by openapi-pro
 
 == openapi-parser and validator
 
-a Java 11 based link:{openapi}[OpenAPI] 3.2, 3.1, 3.0 parser with validation and pluggable document reader & json/yaml converter.
+A link:{openapi}[OpenAPI] 3.2, 3.1, 3.0 parser with validation and pluggable document reader & json/yaml converter.
 
+* requires JDK 17+
 * parse OpenAPI 3.2, 3.1 & 3.0
 * validate OpenAPI 3.2, 3.1 & 3.0 (JSON schema validation, can follow $ref's in the OpenAPI document)
 ** JSON schema draft-4 validation of OpenAPI 3.0

build-logic/src/main/kotlin/openapiparser.library.gradle.kts

@@ -19,8 +19,8 @@ java {
     withJavadocJar()
     withSourcesJar()
 
-    sourceCompatibility = JavaVersion.VERSION_11
-    targetCompatibility = JavaVersion.VERSION_11
+    sourceCompatibility = JavaVersion.VERSION_17
+    targetCompatibility = JavaVersion.VERSION_17
 
     toolchain {
         languageVersion.set(JavaLanguageVersion.of(build.versions.build.jdk.get()))

gradle/build.versions.toml

@@ -3,7 +3,7 @@
 [versions]
 build-plugins = "2026.7"
 
-build-jdk = "11"
+build-jdk = "17"
 test-jdk = "21"
 
 # using the embedded kotlin version of Gradle to avoid mixed versions

gradle/libs.versions.toml

@@ -1,8 +1,7 @@
 [versions]
 openapiparser = "2026.3-SNAPSHOT"
 
-#checker = "4.2.2" requires jdk 17
-checker = "3.55.1
+checker = "4.2.2"
 
 [libraries]
 checker = { module = "org.checkerframework:checker", version.ref = "checker" }