Make the minimum Java version 8

Author: wikumChamith

.github/workflows/maven.yml

@@ -1,59 +1,28 @@
-# this build is designed to replicate the Travis CI workflow
-name: Build with Maven
+name: Java CI with Maven
 
 on:
   push:
-    branches: [ master ]
+    branches: [ "master" ]
   pull_request:
-    branches: [ master ]
-  workflow_dispatch:
+    branches: [ "master" ]
 
 jobs:
   build:
+    runs-on: ubuntu-latest
+
     strategy:
       matrix:
-        platform: [ ubuntu-latest ]
-        java-version: [ 21 ]
-
-    runs-on: ${{ matrix.platform }}
-    env:
-      PLATFORM: ${{ matrix.platform }}
-      JAVA_VERSION: ${{ matrix.java-version }}
+        java: [8, 11, 21]
 
     steps:
-      - uses: actions/checkout@v2
-      - name: Set up JDK
-        uses: actions/setup-java@v1
-        with:
-          java-version: ${{ matrix.java-version }}
-      - name: Cache local Maven repository
-        uses: actions/cache@v3
+      - uses: actions/checkout@v3
+
+      - name: Set up JDK ${{ matrix.java }}
+        uses: actions/setup-java@v3
         with:
-          path: ~/.m2/repository
-          key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
-          restore-keys: |
-            ${{ runner.os }}-maven-
-      - name: Install dependencies
-        run: mvn clean install -DskipTests=true -Dmaven.javadoc.skip=true --batch-mode --show-version --file pom.xml
-      - name: Build with Maven
-        run: mvn test --batch-mode --file pom.xml
-      # this is necessary to populate the environment variables for Coveralls properly
-      - name: Set branch name and PR number
-        id: refs
-        continue-on-error: true
-        env:
-          BRANCH_NAME_OR_REF: ${{ github.head_ref || github.ref }}
-        run: |
-          echo "::set-output name=branch_name::${BRANCH_NAME_OR_REF#refs/heads/}"
-          echo "::set-output name=pr_number::$(jq --raw-output .pull_request.number "$GITHUB_EVENT_PATH")"
-      - name: Update coverage
-        continue-on-error: true
-        if: ${{ steps.refs.outcome == 'success' }}
-        env:
-          CI_NAME: Github
-          CI_BUILD_NUMBER: ${{ github.run_id }}
-          CI_BUILD_URL: https://github.com/${{ github.repository }}/commit/${{ github.event.after }}/checks
-          CI_BRANCH: ${{ steps.refs.outputs.branch_name }}
-          CI_PULL_REQUEST: ${{ steps.refs.outputs.pr_number }}
-        run: mvn jacoco:report coveralls:report --batch-mode --file pom.xml --no-transfer-progress -DrepoToken=${{ secrets.COVERALLS_TOKEN }}
+          java-version: ${{ matrix.java }}
+          distribution: 'adopt'
+          cache: maven
 
+      - name: Build with Maven
+        run: mvn clean install --file pom.xml