Use JDK 22

.github/workflows/maven.yml

@@ -23,12 +23,17 @@ jobs:
     - uses: actions/checkout@v4
       env:
         GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-    - name: Set up JDK 21
-      uses: actions/setup-java@v4 # https://github.com/actions/setup-java
+    - name: Set up JDK 22
+      # TODO: Switch back to actions/setup-java@v4 once they support JDK 22 for temurin
+      #uses: actions/setup-java@v4 # https://github.com/actions/setup-java
+      #with:
+      #  java-version: '22'
+      #  distribution: 'temurin'
+      #  cache: maven
+      uses: oracle-actions/setup-java@v1 # https://github.com/oracle-actions/setup-java
       with:
-        java-version: '21'
-        distribution: 'temurin'
-        cache: maven
+        website: jdk.java.net
+        release: 22
     - name: Verify and Package with Maven
       run: ./mvnw --batch-mode --file pom.xml verify package
 

Dockerfile

@@ -6,7 +6,7 @@
 ###############################################################################
 # Stage 1 (to create a "build" image)                                         #
 ###############################################################################
-FROM eclipse-temurin:21-jdk-alpine AS builder
+FROM eclipse-temurin:22-jdk-alpine AS builder
 
 # Smoke test to verify if java is available.
 RUN java -version

README.md

@@ -17,7 +17,7 @@ Features:
   including a downsized JRE (built inside Docker via `jlink`)
   to minimize the size of the generated Docker image, which is **131MB**.
 - Supports [Docker BuildKit](https://docs.docker.com/build/)
-- Java 21 (Eclipse Temurin)
+- Java 22 (Eclipse Temurin)
 - [JUnit 5](https://github.com/junit-team/junit5) for testing,
   [Jacoco](https://github.com/jacoco/jacoco) for code coverage,
   [SpotBugs](https://github.com/spotbugs/spotbugs) for static code analysis
@@ -130,7 +130,7 @@ $ just docker-image-create
 # Notes
 
 You can also build, test, package, and run the Java application locally
-(without Docker) if you have JDK 21+ installed. You do not need to have Maven
+(without Docker) if you have JDK 22+ installed. You do not need to have Maven
 installed, because this repository contains the
 [Maven Wrapper](https://github.com/apache/maven-wrapper) `mvnw` (use `mvnw.cmd`
 on Windows).

pom.xml

@@ -44,7 +44,7 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
         <!-- Java -->
-        <java.version>21</java.version>
+        <java.version>22</java.version>
         <release.version>${java.version}</release.version>
         <maven.compiler.parameters>true</maven.compiler.parameters>
         <maven.compiler.release>${java.version}</maven.compiler.release>