Migrate to Spring Boot 4 (#868)

* Switched from TomCat to Jetty
* Hibernate migrations
* Removed dependency on Spring-Boot-Content-FS
* Migrate to Jackson 3
* Migrate LegacyExtensionFinder -> IndexedExtensionFinder
* Fix code inspection issues
* Exclude Config classes from Sonar coverage calcualtion
* Add FileStorageServiceTest
* Add tests for (De-)serializers
* Exclude H2 package from Sonar coverage reporting
* Add Sonar scan
* Update JVM in CI
* Update dependency versions

.github/workflows/docker-fix.yml

@@ -16,11 +16,11 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v6
 
-      - name: Set up JDK 21
+      - name: Set up JDK 25
         uses: actions/setup-java@v5
         with:
           distribution: 'temurin'
-          java-version: '21'
+          java-version: '25'
 
       - name: Run production build
         env:

.github/workflows/docker-preview.yml

@@ -20,11 +20,11 @@ jobs:
         with:
           fetch-depth: 0
 
-      - name: Set up JDK 21
+      - name: Set up JDK 25
         uses: actions/setup-java@v5
         with:
           distribution: 'temurin'
-          java-version: '21'
+          java-version: '25'
 
       - name: Setup Gradle
         uses: gradle/actions/setup-gradle@v5

.github/workflows/release.yml

@@ -75,11 +75,11 @@ jobs:
         with:
           name: modified-files
 
-      - name: Set up JDK 21
+      - name: Set up JDK 25
         uses: actions/setup-java@v5
         with:
           distribution: 'temurin'
-          java-version: '21'
+          java-version: '25'
       - name: Setup Gradle
         uses: gradle/actions/setup-gradle@v5
 
@@ -162,11 +162,11 @@ jobs:
         with:
           name: modified-files
 
-      - name: Set up JDK 21
+      - name: Set up JDK 25
         uses: actions/setup-java@v5
         with:
           distribution: 'temurin'
-          java-version: '21'
+          java-version: '25'
 
       - name: Setup Gradle
         uses: gradle/actions/setup-gradle@v5

.github/workflows/sonar.yml

@@ -0,0 +1,44 @@
+name: Sonar Analysis
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    types: [ opened, synchronize, reopened ]
+
+jobs:
+  sonar:
+    name: Sonar Analysis
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v6
+        with:
+          fetch-depth: 0
+
+      - name: Set up JDK 25
+        uses: actions/setup-java@v5
+        with:
+          distribution: 'temurin'
+          java-version: '25'
+
+      - name: Setup Gradle
+        uses: gradle/actions/setup-gradle@v5
+
+      - name: Cache SonarCloud packages
+        uses: actions/cache@v4
+        with:
+          path: ~/.sonar/cache
+          key: ${{ runner.os }}-sonar
+          restore-keys: ${{ runner.os }}-sonar
+
+      - name: Run tests and generate JaCoCo report
+        run: ./gradlew :app:test :app:jacocoTestReport
+
+      - name: SonarCloud Scan
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
+        run: ./gradlew :app:sonar