Added matrix for Java 11 & 15.

.github/workflows/gradle.yml

@@ -5,6 +5,12 @@ on: [push, pull_request, workflow_dispatch]
 jobs:
   build:
     runs-on: ubuntu-latest
+    env:
+      CI_NAME: "GitHub CI"
+      GRADLE_OPTS: "-Dorg.gradle.jvmargs=-XX:MaxMetaspaceSize=512m"
+    strategy:
+      matrix:
+        java-version: [ 11, 15 ]
     steps:
       - uses: actions/checkout@v2
         with:
@@ -12,7 +18,7 @@ jobs:
       - name: Set up JDK 11
         uses: actions/setup-java@v1
         with:
-          java-version: 11
+          java-version: ${{ matrix.java-version }}
       - name: Grant execute permission for gradlew
         run: chmod +x gradlew
       - name: Cache SonarCloud packages
@@ -27,15 +33,17 @@ jobs:
           path: |
             ~/.gradle/caches
             ~/.gradle/wrapper
-          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties') }}
+          key: ${{ runner.os }}-gradle-${{ matrix.java-version }}-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties') }}
           restore-keys: |
-            ${{ runner.os }}-gradle-
+            ${{ runner.os }}-gradle-${{ matrix.java-version }}-
       - name: Test with Gradle
+        run: ./gradlew build check --stacktrace
+      - name: SonarCloud
+        if: matrix.java-version == '11'
         env:
-          CI_NAME: "GitHub CI"
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
-        run: ./gradlew check sonarqube
+        run: ./gradlew sonarqube
       - name: Cleanup Gradle Cache
         run: |
           rm -f ~/.gradle/caches/modules-2/modules-2.lock