Fix GraalVM native images using a Java 11 version of Hmc

.github/workflows/graal.yml

@@ -8,8 +8,39 @@ on:
     types: [opened, reopened]
 
 jobs:
+  build-java-8-wrapper-jar:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-java@v4
+        with:
+          java-version: 8
+          distribution: adopt
+      - name: Grant execute permission for gradlew
+        run: chmod +x gradlew
+      - name: Build
+        run: ./gradlew build --stacktrace
+
+      - name: Delete launcher-wrapper dev jar
+        run: rm headlessmc-launcher-wrapper/build/libs/headlessmc-launcher-*-dev.jar
+      - name: Delete launcher-wrapper javadoc jar
+        run: rm headlessmc-launcher-wrapper/build/libs/headlessmc-launcher-*-javadoc.jar
+      - name: Delete launcher-wrapper sources jar
+        run: rm headlessmc-launcher-wrapper/build/libs/headlessmc-launcher-*-sources.jar
+
+      - name: Rename launcher jar
+        run: mv headlessmc-launcher-wrapper/build/libs/headlessmc-launcher-*.jar headlessmc-launcher-wrapper/build/libs/headlessmc-launcher-wrapper.jar
+
+      - name: Publish Artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: launcher-wrapper-java8-jar
+          path: |
+            ./headlessmc-launcher-wrapper/build/libs/headlessmc-launcher-wrapper.jar
+
   build:
     runs-on: ${{ matrix.os.os }}
+    needs: build-java-8-wrapper-jar
     strategy:
       matrix:
         os:
@@ -28,6 +59,14 @@ jobs:
           distribution: 'graalvm'
           github-token: ${{ secrets.GITHUB_TOKEN }}
 
+      - name: Download HeadlessMc Launcher Artifact
+        uses: actions/download-artifact@v4
+      - name: Display structure of downloaded files
+        run: ls -R
+      - uses: geekyeggo/delete-artifact@v5
+        with:
+          name: launcher-wrapper-java8-jar
+
       - name: Output Graal Info
         run: |
           echo "GRAALVM_HOME: $GRAALVM_HOME"

.gitignore

@@ -49,3 +49,4 @@ run
 *.jar
 !*gradle-wrapper.jar
 /mc/
+/launcher-wrapper-java8-jar/

gradle.properties

@@ -6,3 +6,7 @@ hmc_integration_test_enabled=false
 hmc_graal_build=false
 # The name of the executable file created by graalvm
 hmc_graal_executable=headlessmc-launcher
+# The name of the Java 8 jar file to include in the GraalVM image
+# Because GraalVM cannot build Java 8 jars, we need to build one with Java 8 first,
+# Then put it in the GraalVM jar.
+hmc_graal_wrapper_jar=launcher-wrapper-java8-jar/headlessmc-launcher-wrapper.jar

headlessmc-graalvm/build.gradle

@@ -25,9 +25,13 @@ dependencies {
     implementation 'me.tongfei:progressbar:0.9.5'
 }
 
+if (!new File(rootProject.projectDir, hmc_graal_wrapper_jar).exists()) {
+    throw new IllegalStateException("$hmc_graal_wrapper_jar does not exist!")
+}
+
 processResources {
     into('headlessmc') {
-        from project(':headlessmc-launcher-wrapper')['shadowJar']
+        from file(new File(rootProject.projectDir, hmc_graal_wrapper_jar))
         rename 'headlessmc-launcher(.*).jar', 'headlessmc-launcher-wrapper.jar'
     }
 }
@@ -43,6 +47,7 @@ graalvmNative {
             sharedLibrary = false
             buildArgs.add('--enable-url-protocols=https')
             buildArgs.add('-O4')
+            javaLauncher
         }
     }
 }