Enable PMD analysis cache

.github/workflows/check-build.yml

@@ -26,12 +26,10 @@ jobs:
   build:
     runs-on: ubuntu-latest
     timeout-minutes: 30
-
     strategy:
       matrix:
-        java: [11, 17, 21]
+        java: [17, 21]
         distribution: [temurin]
-
     steps:
     - uses: actions/checkout@v5
 
@@ -40,11 +38,17 @@ jobs:
       with:
         distribution: ${{ matrix.distribution }}
         java-version: ${{ matrix.java }}
-        cache: 'maven'
+
+    - name: Cache Maven
+      uses: actions/cache@v4
+      with:
+        path: ~/.m2/repository
+        key: ${{ runner.os }}-mvn-build-${{ hashFiles('**/pom.xml') }}
+        restore-keys: |
+          ${{ runner.os }}-mvn-build-
 
     - name: Build with Maven
-      # Java 17 is required for tests
-      run: ./mvnw -B clean package ${{ matrix.java >=17 && '-P run-integration-tests' || '-Dmaven.test.skip=true' }}
+      run: ./mvnw -B clean package -P run-integration-tests
 
     - name: Check for uncommited changes
       run: |
@@ -79,6 +83,31 @@ jobs:
         path: ${{ env.PRIMARY_MAVEN_MODULE }}/target/screenshots
         if-no-files-found: ignore
 
+  # Ensure compatibility with Java 11
+  # See https://github.com/xdev-software/chartjs-java-model/issues/14
+  build-java-11:
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    steps:
+    - uses: actions/checkout@v5
+
+    - name: Set up JDK
+      uses: actions/setup-java@v5
+      with:
+        distribution: temurin
+        java-version: 11
+
+    - name: Cache Maven
+      uses: actions/cache@v4
+      with:
+        path: ~/.m2/repository
+        key: ${{ runner.os }}-mvn-build-java-11-${{ hashFiles('**/pom.xml') }}
+        restore-keys: |
+          ${{ runner.os }}-mvn-build-java-11-
+
+    - name: Build with Maven
+      run: ./mvnw -B clean package -Dmaven.test.skip=true
+
   checkstyle:
     runs-on: ubuntu-latest
     if: ${{ github.event_name != 'pull_request' || !startsWith(github.head_ref, 'renovate/') }}
@@ -97,7 +126,22 @@ jobs:
       with:
         distribution: ${{ matrix.distribution }}
         java-version: ${{ matrix.java }}
-        cache: 'maven'
+
+    - name: Cache Maven
+      uses: actions/cache@v4
+      with:
+        path: ~/.m2/repository
+        key: ${{ runner.os }}-mvn-checkstyle-${{ hashFiles('**/pom.xml') }}
+        restore-keys: |
+          ${{ runner.os }}-mvn-checkstyle-
+
+    - name: CheckStyle Cache
+      uses: actions/cache@v4
+      with:
+        path: '**/target/checkstyle-cachefile'
+        key: ${{ runner.os }}-checkstyle-${{ hashFiles('**/pom.xml') }}
+        restore-keys: |
+          ${{ runner.os }}-checkstyle-
 
     - name: Run Checkstyle
       run: ./mvnw -B checkstyle:check -P checkstyle -T2C
@@ -120,7 +164,22 @@ jobs:
       with:
         distribution: ${{ matrix.distribution }}
         java-version: ${{ matrix.java }}
-        cache: 'maven'
+
+    - name: Cache Maven
+      uses: actions/cache@v4
+      with:
+        path: ~/.m2/repository
+        key: ${{ runner.os }}-mvn-pmd-${{ hashFiles('**/pom.xml') }}
+        restore-keys: |
+          ${{ runner.os }}-mvn-pmd-
+
+    - name: PMD Cache
+      uses: actions/cache@v4
+      with:
+        path: '**/target/pmd/pmd.cache'
+        key: ${{ runner.os }}-pmd-${{ hashFiles('**/pom.xml') }}
+        restore-keys: |
+          ${{ runner.os }}-pmd-
 
     - name: Run PMD
       run: ./mvnw -B test pmd:aggregate-pmd-no-fork pmd:check -P pmd -DskipTests -T2C

.github/workflows/release.yml

@@ -11,6 +11,8 @@ permissions:
   contents: write
   pull-requests: write
 
+# DO NOT RESTORE CACHE for critical release steps to prevent a (extremely unlikely) scenario 
+# where a supply chain attack could be achieved due to poisoned cache
 jobs:
   check-code:
     runs-on: ubuntu-latest
@@ -23,7 +25,15 @@ jobs:
       with:
         java-version: '17'
         distribution: 'temurin'
-        cache: 'maven'
+
+    # Try to reuse existing cache from check-build
+    - name: Try restore Maven Cache
+      uses: actions/cache/restore@v4
+      with:
+        path: ~/.m2/repository
+        key: ${{ runner.os }}-mvn-build-${{ hashFiles('**/pom.xml') }}
+        restore-keys: |
+          ${{ runner.os }}-mvn-build-
 
     - name: Build with Maven
       run: ./mvnw -B clean package -T2C
@@ -166,7 +176,15 @@ jobs:
       with:
         java-version: '17'
         distribution: 'temurin'
-        cache: 'maven'
+
+    # Try to reuse existing cache from check-build
+    - name: Try restore Maven Cache
+      uses: actions/cache/restore@v4
+      with:
+        path: ~/.m2/repository
+        key: ${{ runner.os }}-mvn-build-${{ hashFiles('**/pom.xml') }}
+        restore-keys: |
+          ${{ runner.os }}-mvn-build-
 
     - name: Build site
       run: ../mvnw -B compile site -DskipTests -T2C

chartjs-java-model/pom.xml

@@ -355,6 +355,7 @@
 						<artifactId>maven-pmd-plugin</artifactId>
 						<version>3.27.0</version>
 						<configuration>
+							<analysisCache>true</analysisCache>
 							<includeTests>true</includeTests>
 							<printFailingErrors>true</printFailingErrors>
 							<rulesets>

pom.xml

@@ -72,6 +72,7 @@
 						<artifactId>maven-pmd-plugin</artifactId>
 						<version>3.27.0</version>
 						<configuration>
+							<analysisCache>true</analysisCache>
 							<includeTests>true</includeTests>
 							<printFailingErrors>true</printFailingErrors>
 							<rulesets>