Add GitHub Actions CI with JaCoCo coverage badges

.github/dependabot.yml

@@ -0,0 +1,13 @@
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+  - package-ecosystem: "maven"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    groups:
+      maven-minor-and-patch:
+        update-types: [ "minor", "patch" ]

.github/workflows/ci.yml

@@ -0,0 +1,93 @@
+name: CI
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+# Supersede outdated PR runs; queue runs on main in order so badges never regress
+concurrency:
+  group: ci-${{ github.ref }}
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    timeout-minutes: 20
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
+
+      - name: Set up JDK 25
+        uses: actions/setup-java@b843ebf9b913146b38da2eaa7aeddf76074ae1ad # v6.1.0
+        with:
+          java-version: '25'
+          distribution: 'temurin'
+          cache: 'maven'
+
+      - name: Run tests with coverage
+        run: ./mvnw -B clean test
+
+      - name: Upload coverage report
+        if: github.ref == 'refs/heads/main'
+        uses: actions/upload-artifact@cf430e030ddbb5b0abf93d22962f4752f3646cd9 # v7.0.2
+        with:
+          name: jacoco-report
+          path: target/site/jacoco/jacoco.csv
+          if-no-files-found: error
+          retention-days: 1
+
+  # Only this job gets a write token, and only on main
+  badges:
+    needs: test
+    if: github.ref == 'refs/heads/main'
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    permissions:
+      contents: write
+    steps:
+      # Check out the branch tip (not the triggering SHA) so the badge commit fast-forwards
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          ref: main
+          fetch-depth: 50
+
+      # A re-run of an older commit must not replace the badges of newer code
+      - name: Check commit is still the latest on main
+        id: latest
+        run: |
+          if ! git merge-base --is-ancestor "$GITHUB_SHA" HEAD; then
+            echo "is_latest=false" >> "$GITHUB_OUTPUT"
+          elif git log --format=%s "$GITHUB_SHA"..HEAD | grep -qvx 'chore: update JaCoCo coverage badges'; then
+            echo "is_latest=false" >> "$GITHUB_OUTPUT"
+          else
+            echo "is_latest=true" >> "$GITHUB_OUTPUT"
+          fi
+
+      - name: Download coverage report
+        if: steps.latest.outputs.is_latest == 'true'
+        uses: actions/download-artifact@9000827ccba6bdab643e8b6fd33ac0654aef8333 # v8.0.2
+        with:
+          name: jacoco-report
+          path: target/site/jacoco
+
+      - name: Generate JaCoCo badge
+        if: steps.latest.outputs.is_latest == 'true'
+        uses: cicirello/jacoco-badge-generator@72266185b7ee48a6fd74eaf0238395cc8b14fef8 # v2.12.1
+        with:
+          generate-branches-badge: true
+          jacoco-csv-file: target/site/jacoco/jacoco.csv
+          badges-directory: .github/badges
+
+      - name: Commit updated badges
+        if: steps.latest.outputs.is_latest == 'true'
+        uses: stefanzweifel/git-auto-commit-action@4a55954c782fc1ea30b9056cd3e7a2b40ca8887d # v7.2.0
+        with:
+          commit_message: "chore: update JaCoCo coverage badges"
+          file_pattern: '.github/badges/*.svg'

README.md

@@ -1,4 +1,8 @@
 # java-spring-rest
+![CI](https://github.com/andreasarf/java-spring-rest/actions/workflows/ci.yml/badge.svg?branch=main)
+![Coverage](.github/badges/jacoco.svg)
+![Branches](.github/badges/branches.svg)
+
 Example for implementation Rest API using Spring Boot.
 
 ## Requirement

lombok.config

@@ -0,0 +1,2 @@
+config.stopBubbling = true
+lombok.addLombokGeneratedAnnotation = true

pom.xml

@@ -17,6 +17,7 @@
 	<properties>
 		<java.version>25</java.version>
 		<swagger-annotations.version>2.2.55</swagger-annotations.version>
+		<jacoco.version>0.8.15</jacoco.version>
 		<!-- Overridden by agents such as JaCoCo; keeps @{argLine} resolvable when none is set -->
 		<argLine></argLine>
 	</properties>
@@ -119,6 +120,25 @@
 					</excludes>
 				</configuration>
 			</plugin>
+			<plugin>
+				<groupId>org.jacoco</groupId>
+				<artifactId>jacoco-maven-plugin</artifactId>
+				<version>${jacoco.version}</version>
+				<executions>
+					<execution>
+						<goals>
+							<goal>prepare-agent</goal>
+						</goals>
+					</execution>
+					<execution>
+						<id>report</id>
+						<phase>test</phase>
+						<goals>
+							<goal>report</goal>
+						</goals>
+					</execution>
+				</executions>
+			</plugin>
 		</plugins>
 	</build>