Experimenting with GraalVM

.github/workflows/graal.yml

@@ -0,0 +1,44 @@
+name: Build Graal Native Image
+
+on:
+  workflow_dispatch:
+  push:
+  pull_request:
+    types: [opened, reopened]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: graalvm/setup-graalvm@v1
+        with:
+          java-version: '23'
+          distribution: 'graalvm'
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Output Graal Info
+        run: |
+          echo "GRAALVM_HOME: $GRAALVM_HOME"
+          echo "JAVA_HOME: $JAVA_HOME"
+          java --version
+          native-image --version
+
+      - name: Grant execute permission for gradlew
+        run: chmod +x gradlew
+
+      - name: Build with Gradle
+        run: |
+          ./gradlew -Phmc_graal_build=true headlessmc-launcher:nativeCompile
+
+      - name: List files
+        run: ls headlessmc-launcher/build/native/nativeCompile
+
+      - name: Publish Artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: HeadlessMc Native image files
+          path: |
+            ./headlessmc-launcher/build/native/nativeCompile/*

build.gradle

@@ -42,12 +42,17 @@ allprojects {
         }
     }
 
-    sourceCompatibility = JavaVersion.VERSION_1_8
-    targetCompatibility = JavaVersion.VERSION_1_8
-
-    compileJava {
-        if (JavaVersion.current().isJava9Compatible()) {
-            options.compilerArgs.addAll(['--release', '8'])
+    if (rootProject.hmc_graal_build) {
+        sourceCompatibility = JavaVersion.VERSION_11
+        targetCompatibility = JavaVersion.VERSION_11
+    } else {
+        sourceCompatibility = JavaVersion.VERSION_1_8
+        targetCompatibility = JavaVersion.VERSION_1_8
+
+        compileJava {
+            if (JavaVersion.current().isJava9Compatible()) {
+                options.compilerArgs.addAll(['--release', '8'])
+            }
         }
     }
 

gradle.properties

@@ -2,3 +2,5 @@ project_version=2.4.1
 org.gradle.jvmargs=-Xmx2048m
 # set to true if you want to run the headlessmc-launcher-wrapper integration tests
 hmc_integration_test_enabled=false
+# set to true if you want to build a graalvm image of the headlessmc-launcher
+hmc_graal_build=false

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.9-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.10-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

headlessmc-launcher/build.gradle

@@ -1,10 +1,11 @@
 plugins {
     id 'application'
+    id 'org.graalvm.buildtools.native' version '0.10.4'
 }
 
 def MAIN_CLASS = 'me.earth.headlessmc.launcher.Main'
 application {
-    mainClass = MAIN_CLASS
+    mainClass.set(MAIN_CLASS)
 }
 
 run {

headlessmc-modlauncher/build.gradle

@@ -1,7 +1,9 @@
-sourceSets {
-    java9stub
-    main {
-        compileClasspath += java9stub.compileClasspath + java9stub.output
+if (!JavaVersion.current().isJava9Compatible()) {
+    sourceSets {
+        java9stub
+        main {
+            compileClasspath += java9stub.compileClasspath + java9stub.output
+        }
     }
 }