CI reproducibility: explicitely setting up JDK 21 (for Kotlin)

.github/workflows/ci.yml

@@ -15,7 +15,16 @@ jobs:
       - name: Checkout sources
         uses: actions/checkout@v6
 
-      - name: Set up JDK
+      # Kotlin DSL compilation uses JDK 21 today (Gradle embeds Kotlin 2.2.x)
+      - name: Set up JDK 21 (Kotlin DSL toolchain)
+        uses: actions/setup-java@v5
+        with:
+          distribution: temurin
+          java-version: 21
+
+      # Tests/Java toolchain tasks use JDK 25
+      # JDK declaration order matters as the last one declared will be the default one (thus used to run Gradle itself)
+      - name: Set up JDK 25 (Gradle runtime + Java toolchain/tests)
         uses: actions/setup-java@v5
         with:
           distribution: temurin

README.md

@@ -151,7 +151,7 @@ tasks.withType<JacocoCoverageVerification>().configureEach {
     violationRules {
         rules.forEach { rule ->
             rule.limits.forEach { limit ->
-                limit.minimum = "0.91".toBigDecimal()
+                limit.minimum = "0.83".toBigDecimal()
             }
         }
     }

build.gradle.kts

@@ -10,7 +10,7 @@ plugins {
 }
 
 group = "io.github.leanish"
-version = "0.3.1"
+version = "0.3.2-SNAPSHOT"
 
 repositories {
     gradlePluginPortal()
@@ -19,13 +19,14 @@ repositories {
 
 java {
     toolchain {
-        // Build/test the plugin on Java 25 to mirror the conventions' default toolchain.
+        // No Java sources today, but pinning Java toolchain tasks (especially tests) to 25 to mirror the conventions' default toolchain.
         languageVersion.set(JavaLanguageVersion.of(25))
     }
 }
 
 kotlin {
-    // Gradle embeds Kotlin 2.2.x today; pinning it to JDK 21 until Gradle uses Kotlin 2.3+.
+    // Gradle embeds Kotlin 2.2.x today; kotlin-dsl compilation stays on JDK 21 until Gradle moves to Kotlin 2.3+.
+    // At that point we should align this to 25 and simplify CI back to a single JDK.
     jvmToolchain(21)
 }