set jdk-release version as well

Author: Jolanrensen

build.gradle.kts

@@ -133,18 +133,25 @@ tasks.named<DependencyUpdatesTask>("dependencyUpdates").configure {
     }
 }
 
-kotlin.jvmToolchain(21)
+kotlin {
+    jvmToolchain(21)
+    compilerOptions {
+        jvmTarget = JvmTarget.JVM_11
+    }
+}
 
 allprojects {
     tasks.withType<KotlinCompile> {
         compilerOptions {
             jvmTarget = JvmTarget.JVM_11
+            freeCompilerArgs.add("-Xjdk-release=11")
         }
     }
 
     tasks.withType<JavaCompile> {
         sourceCompatibility = JavaVersion.VERSION_11.toString()
         targetCompatibility = JavaVersion.VERSION_11.toString()
+        options.release.set(11)
     }
 
     // Attempts to configure ktlint for each sub-project that uses the plugin

plugins/keywords-generator/build.gradle.kts

@@ -1,3 +1,6 @@
+import org.jetbrains.kotlin.gradle.dsl.JvmTarget
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
+
 plugins {
     `java-gradle-plugin`
     `kotlin-dsl`
@@ -22,6 +25,20 @@ dependencies {
     implementation("com.squareup:kotlinpoet:$kotlinPoetVersion")
 }
 
+kotlin {
+    jvmToolchain(21)
+    compilerOptions {
+        jvmTarget = JvmTarget.JVM_11
+        freeCompilerArgs.add("-Xjdk-release=11")
+    }
+}
+
+tasks.withType<JavaCompile> {
+    sourceCompatibility = JavaVersion.VERSION_11.toString()
+    targetCompatibility = JavaVersion.VERSION_11.toString()
+    options.release.set(11)
+}
+
 gradlePlugin {
     plugins {
         create("dependencies") {