Adding a verification step for JDK 7

Author: carlosroman

.github/workflows/test.yml

@@ -34,6 +34,36 @@ jobs:
     - name: Run lint
       run: ./mvnw verify -B -Dhttps.protocols=TLSv1.2 -DskipTests
 
+  jdk7-verification:
+    name: JDK 7 verification
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+      
+    - name: Set up JDK 8
+      uses: actions/setup-java@v4
+      with:
+        java-version: '8'
+        distribution: 'temurin'
+        
+    - name: Cache Maven packages
+      uses: actions/cache@v4
+      with:
+        path: ~/.m2
+        key: ${{ runner.os }}-m2-${{ github.ref }}-${{ hashFiles('**/pom.xml') }}-jdk7
+        restore-keys: |
+          ${{ runner.os }}-m2-${{ github.ref }}-
+          ${{ runner.os }}-m2-
+          
+    - name: Build JMXFetch
+      run: ./mvnw clean package -DskipTests
+
+    - name: Run using JDK 7
+      run: docker run -i --rm -v $(pwd):/app -w /app openjdk:7-jdk java -jar ./target/jmxfetch-0.49.9-SNAPSHOT-jar-with-dependencies.jar --help
+
   test:
     name: Test (OpenJDK ${{ matrix.java-version }})
     runs-on: ubuntu-latest