Make sure build and tests run when using Java 21

Author: jjohannes

build.gradle.kts

@@ -6,10 +6,8 @@ plugins {
 group = "org.gradlex"
 version = "1.7"
 
-java {
-    sourceCompatibility = JavaVersion.VERSION_1_8
-    targetCompatibility = JavaVersion.VERSION_1_8
-}
+tasks.withType<JavaCompile>().configureEach { options.release = 8 }
+tasks.withType<GroovyCompile>().configureEach { options.release = 8 }
 
 dependencies {
     testImplementation("org.spockframework:spock-core:2.1-groovy-3.0")

src/test/groovy/org/gradlex/javamodule/testing/test/fixture/GradleBuild.groovy

@@ -59,6 +59,7 @@ class GradleBuild {
             tasks.test {
                 testLogging.showStandardStreams = true
             }
+            tasks.withType<JavaCompile>().configureEach { options.release.set(11) }
         """
         file("app/src/main/java/org/example/app/Main.java") << '''
             package org.example.app;
@@ -91,6 +92,7 @@ class GradleBuild {
                 id("java-library")
             }
             group = "org.example"
+            tasks.withType<JavaCompile>().configureEach { options.release.set(11) }
         '''
     }