restore Java 11 compatibility

.github/workflows/build-jlink-plugin.yml

@@ -12,10 +12,10 @@ jobs:
         os: [ubuntu-latest, windows-latest, macOS-latest]
     steps:
     - uses: actions/checkout@v4
-    - name: Set up JDK 17
+    - name: Set up JDK 11
       uses: actions/setup-java@v4
       with:
-        java-version: '17'
+        java-version: '11'
         distribution: 'zulu'
     - name: Gradle build
       uses: gradle/gradle-build-action@v3
@@ -37,10 +37,10 @@ jobs:
     if: "startsWith(github.event.head_commit.message, 'Release ')"
     steps:
       - uses: actions/checkout@v4
-      - name: Set up JDK 17
+      - name: Set up JDK 11
         uses: actions/setup-java@v4
         with:
-          java-version: '17'
+          java-version: '11'
           distribution: 'zulu'
       - name: Publish Gradle Plugins
         uses: gradle/gradle-build-action@v3

.github/workflows/publish-plugin.yml

@@ -7,10 +7,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - name: Set up JDK 17
+      - name: Set up JDK 11
         uses: actions/setup-java@v4
         with:
-          java-version: '17'
+          java-version: '11'
           distribution: 'zulu'
       - name: Publish Gradle Plugins
         uses: gradle/gradle-build-action@v3

build.gradle

@@ -18,7 +18,7 @@ plugins {
     id 'org.ajoberstar.git-publish' version '4.2.2'
 }
 
-java.toolchain.languageVersion = JavaLanguageVersion.of(17)
+java.toolchain.languageVersion = JavaLanguageVersion.of(11)
 
 project.version.with {
     major = pluginVersionMajor as int

doc/introduction.adoc

@@ -18,7 +18,7 @@ The plugin provides several tasks. The most frequently used are `jlink`, which c
 and `jlinkZip`, which in addition creates a zip archive of the custom runtime image.
 With the `jpackage` task you can create a platform-specific installer for your application.
 
-WARNING: The current version of this plugin requires Java 17 and Gradle 7.4 or newer.
+WARNING: The current version of this plugin requires Java 11 and Gradle 7.4 or newer.
 While it might work with some combinations of older Java and Gradle versions, these are not officially supported.
 If you are forced to work with an older Gradle release, you should use https://badass-jlink-plugin.beryx.org/releases/2.25.0/[the version 2.25.0] of this plugin.
 

src/test/groovy/org/beryx/jlink/JavaVersionSpec.groovy

@@ -26,6 +26,6 @@ class JavaVersionSpec extends Specification {
         int version = JavaVersion.get(System.getenv('JAVA_HOME'))
 
         then:
-        version == 17
+        version == 11
     }
 }

src/test/resources/hello-bom/build.gradle

@@ -7,8 +7,8 @@ repositories {
     mavenCentral()
 }
 
-sourceCompatibility = 17
-targetCompatibility = 17
+sourceCompatibility = 11
+targetCompatibility = 11
 
 dependencies {
     // import a BOM

src/test/resources/hello-log4j-2.19.0/build.additive.gradle

@@ -6,8 +6,8 @@ repositories {
     mavenCentral()
 }
 
-sourceCompatibility = 17
-targetCompatibility = 17
+sourceCompatibility = 11
+targetCompatibility = 11
 
 ext.log4jVersion = '2.19.0'
 

src/test/resources/hello-log4j-2.19.0/build.additive.gradle.kts

@@ -7,8 +7,8 @@ repositories {
 }
 
 java {
-    sourceCompatibility = JavaVersion.VERSION_17
-    targetCompatibility = JavaVersion.VERSION_17
+    sourceCompatibility = JavaVersion.VERSION_11
+    targetCompatibility = JavaVersion.VERSION_11
 }
 
 val log4jVersion = "2.19.0"

src/test/resources/hello-log4j-2.19.0/build.gradle

@@ -6,8 +6,8 @@ repositories {
     mavenCentral()
 }
 
-sourceCompatibility = 17
-targetCompatibility = 17
+sourceCompatibility = 11
+targetCompatibility = 11
 
 ext.log4jVersion = '2.19.0'
 

src/test/resources/local-deps/build.gradle

@@ -6,7 +6,7 @@ plugins {
 group 'org.example'
 version '1.0'
 
-sourceCompatibility = 17
+sourceCompatibility = 11
 
 application {
     mainClass = "org.example.Hello"