Upgrade to JDK 23 and add GitHub Actions CI workflow

.circleci/config.yml

@@ -3,7 +3,7 @@ version: 2.1
 jobs:
   build:
     docker:
-      - image: cimg/openjdk:17.0
+      - image: cimg/openjdk:23.0
     steps:
       # Checkout the code as the first step.
       - checkout

.github/workflows/ci.yml

@@ -0,0 +1,72 @@
+name: CI
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        java-version: ['17', '21', '23']
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Set up JDK ${{ matrix.java-version }}
+      uses: actions/setup-java@v4
+      with:
+        java-version: ${{ matrix.java-version }}
+        distribution: 'temurin'
+
+    - name: Cache Maven packages
+      uses: actions/cache@v4
+      with:
+        path: ~/.m2
+        key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}
+        restore-keys: ${{ runner.os }}-m2
+
+    - name: Run tests
+      run: mvn clean test
+
+    - name: Generate test report
+      run: mvn jacoco:report
+
+    - name: Upload coverage to Codecov
+      if: matrix.java-version == '23'
+      uses: codecov/codecov-action@v4
+      with:
+        file: ./target/site/jacoco/jacoco.xml
+        fail_ci_if_error: false
+
+  build:
+    runs-on: ubuntu-latest
+    needs: test
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Set up JDK 23
+      uses: actions/setup-java@v4
+      with:
+        java-version: '23'
+        distribution: 'temurin'
+
+    - name: Cache Maven packages
+      uses: actions/cache@v4
+      with:
+        path: ~/.m2
+        key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}
+        restore-keys: ${{ runner.os }}-m2
+
+    - name: Build with Maven
+      run: mvn clean compile package -DskipTests
+
+    - name: Upload artifacts
+      uses: actions/upload-artifact@v4
+      with:
+        name: jar-artifacts
+        path: target/*.jar

pom.xml

@@ -51,7 +51,7 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
 
-        <java.version>17</java.version>
+        <java.version>23</java.version>
         <java.showDeprecation>true</java.showDeprecation>
         <java.showWarnings>true</java.showWarnings>
         <java.optimize>true</java.optimize>