actions: make sure the CI env JDK is used for java tasks by gradle

Author: fprochazka

.github/workflows/gradle-build.yml

@@ -30,6 +30,9 @@ jobs:
         with:
           add-job-summary-as-pr-comment: on-failure
 
+      - name: Gradle build environment info
+        run: ./gradlew -q buildEnvironment
+
       - name: Execute Gradle build
         run: ./gradlew --continue build
 

buildSrc/src/main/kotlin/framefork.java.gradle.kts

@@ -18,10 +18,6 @@ repositories {
 java {
     sourceCompatibility = JavaVersion.VERSION_21
     targetCompatibility = JavaVersion.VERSION_21
-
-    toolchain {
-        languageVersion = JavaLanguageVersion.of(21)
-    }
 }
 
 dependencies {
@@ -54,6 +50,14 @@ idea {
     }
 }
 
+tasks.withType<JavaCompile>() {
+    doLast {
+        javaCompiler.getOrNull()?.also {
+            println("Used JDK: ${it.metadata.javaRuntimeVersion} ${it.metadata.vendor}")
+        }
+    }
+}
+
 tasks.withType<Test> {
     useJUnitPlatform()
 

gradle.properties

@@ -6,6 +6,9 @@ org.gradle.configuration-cache=false
 org.gradle.console=verbose
 org.gradle.warning.mode=all
 
+org.gradle.java.installations.auto-detect=true
+org.gradle.java.installations.auto-download=false
+
 kapt.use.k2=true
 # Enable Kapt Incremental annotation processing requeste
 kapt.incremental.apt=true