Upgrade to to Spring Boot 3.4.x and Java 21

Author: RawSanj

.github/workflows/codeql-analysis.yml

@@ -30,10 +30,11 @@ jobs:
         # We must fetch at least the immediate parents so that if this is
         # a pull request then we can checkout the head.
         fetch-depth: 2
-    - name: Set up JDK 17
-      uses: actions/setup-java@v1
+    - name: Set up JDK 21
+      uses: actions/setup-java@v4
       with:
-          java-version: 17
+          distribution: temurin
+          java-version: 21
     # If this run was triggered by a pull request event, then checkout
     # the head of the pull request instead of the merge commit.
     - run: git checkout HEAD^2

.github/workflows/docker-graalvm-native-image.yml

@@ -30,7 +30,7 @@ jobs:
       - name: Set Image Tag Version
         uses: actions/setup-java@v4
         with:
-          java-version: 17
+          java-version: 21
           distribution: temurin
       - run: echo "TAG_VERSION=$(mvn help:evaluate -Dexpression=project.version -q -DforceStdout)" >> $GITHUB_ENV
 
@@ -39,6 +39,6 @@ jobs:
         with:
           context: .
           file: src/main/docker/Dockerfile.native
-          platforms: linux/amd64,linux/arm64
+          platforms: linux/amd64,linux/arm64,linux/arm/v7
           push: true
           tags: rawsanj/spring-redis-websocket:${{ env.TAG_VERSION }}-native

.github/workflows/docker-jvm-image.yml

@@ -30,7 +30,7 @@ jobs:
       - name: Set Image Tag Version
         uses: actions/setup-java@v4
         with:
-          java-version: 17
+          java-version: 21
           distribution: temurin
       - run: echo "TAG_VERSION=$(mvn help:evaluate -Dexpression=project.version -q -DforceStdout)" >> $GITHUB_ENV
 
@@ -39,6 +39,6 @@ jobs:
         with:
           context: .
           file: src/main/docker/Dockerfile.jvm
-          platforms: linux/amd64,linux/arm64
+          platforms: linux/amd64,linux/arm64,linux/arm/v7
           push: true
           tags: rawsanj/spring-redis-websocket:${{ env.TAG_VERSION }}-jvm

LICENSE

@@ -186,7 +186,7 @@
       same "printed page" as the copyright notice for easier
       identification within third-party archives.
 
-   Copyright 2023 Sanjay Rawat
+   Copyright 2025 Sanjay Rawat
 
    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.

README.md

@@ -9,7 +9,7 @@
 
 ## Multi-instance Reactive Chat App using Spring Boot WebFlux and Redis Pub/Sub
 
-Scalable Java 17 Spring Boot 3.x WebFlux Chat Application to demonstrate use of Reactive Redis [Pub/Sub] using
+Scalable Java 21 Spring Boot 3.x WebFlux Chat Application to demonstrate use of Reactive Redis [Pub/Sub] using
 Reactive [WebSocket Handler], without using any external Message Broker like RabbitMQ to sync messages between different
 instances.
 
@@ -26,6 +26,9 @@ Additionally, the Docker Image for JVM base is available for AMD64 and ARM64 arc
 >1. [Spring-Boot 2.4.6: Java-11 Reactive JVM & GraalVM Native version](https://github.com/RawSanj/spring-redis-websocket/tree/spring-boot-webflux-graal-native-2.4.6)
 >2. [Spring-Boot 2.5.2: Java-11 Reactive JVM & GraalVM Native version](https://github.com/RawSanj/spring-redis-websocket/tree/spring-boot-webflux-graal-native-2.5.2)
 
+> The older reactive spring-boot 3.2.x (java 17) based spring-redis-websocket application can be found in below:
+>1. [Spring-Boot 3.2.0: Java-11 Reactive JVM & GraalVM Native version](https://github.com/RawSanj/spring-redis-websocket/tree/spring-boot-webflux-graal-native-3.2.0)
+
 ### Deploy to Play-with-Docker
 
 Ctrl + Click this button to deploy multiple instances of the spring-redis-websocket load balanced by [Traefik]:
@@ -50,8 +53,8 @@ Hence, this application is configured to use GraalVMVM native image tracing agen
 1. To run integration test which uses [Redis TestContainers](https://www.testcontainers.org/supported_docker_environment) so [Docker] should be configured properly to run [Testcontainers]
 2. You also need to install [GraalVMVM JDK](https://github.com/graalvm/graalvm-ce-builds/releases/tag/vm-22.3.0) and [native-image](https://www.graalvm.org/reference-manual/native-image) component:
    ```sh
-   $ sdk install java 22.3.r17-nik         # Using [SDKMAN](https://sdkman.io/jdks) install GraalVMVM distribution of JDK
-   $ sdk use java 22.3.r17-nik
+   $ sdk install java 21.0.2-graalce         # Using [SDKMAN](https://sdkman.io/jdks) install GraalVMVM distribution of JDK
+   $ sdk use java 21.0.2-graalce
    ```
 
 ##### Clone repo:
@@ -108,9 +111,9 @@ $ mvn -Pnative clean spring-boot:build-image
 Run docker image:
 
 ```sh
-$ docker run -d -p 8080:8080 rawsanj/spring-redis-websocket:3.2.0-jvm # JVM based Docker Image
+$ docker run -d -p 8080:8080 rawsanj/spring-redis-websocket:3.4.4-jvm # JVM based Docker Image
 
-$ docker run -d -p 8080:8080 rawsanj/spring-redis-websocket:3.2.0-native  # GraalVM Native Image based Docker Image
+$ docker run -d -p 8080:8080 rawsanj/spring-redis-websocket:3.4.4-native  # GraalVM Native Image based Docker Image
 ```
 
 #### Run multiple instances using docker-compose locally
@@ -187,7 +190,7 @@ License
 
 Apache License 2.0
 
-Copyright (c) 2023 Sanjay Rawat
+Copyright (c) 2025 Sanjay Rawat
 
 [//]: #
 

build.sh

@@ -1,4 +1,6 @@
-#!/usr/bin/env bash
+#!/bin/bash -i
+
+shopt -s expand_aliases
 
 # Runs Tests and Creates Docker Image based on Spring Graal Native Image
 echo '**************************************************************'

pom.xml

@@ -5,21 +5,21 @@
 
 	<groupId>com.github.rawsanj</groupId>
 	<artifactId>spring-redis-websocket</artifactId>
-	<version>3.2.0</version>
+	<version>3.4.4</version>
 	<packaging>jar</packaging>
 
 	<name>spring-redis-websocket</name>
-	<description>Spring Boot 3.x - Project for WebSocket Notification/Chat using Redis Pub/Sub - Java 17</description>
+	<description>Spring Boot 3.x - Project for WebSocket Notification/Chat using Redis Pub/Sub - Java 21</description>
 
 	<parent>
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-starter-parent</artifactId>
-		<version>3.2.0</version>
+		<version>3.4.4</version>
 		<relativePath/> <!-- lookup parent from repository -->
 	</parent>
 
 	<properties>
-		<java.version>17</java.version>
+		<java.version>21</java.version>
 		<registry.image.name>rawsanj/spring-redis-websocket</registry.image.name>
 		<skipNativeImage>true</skipNativeImage>
 	</properties>
@@ -65,6 +65,12 @@
 			<scope>test</scope>
 		</dependency>
 
+		<dependency>
+			<groupId>io.projectreactor.tools</groupId>
+			<artifactId>blockhound</artifactId>
+			<version>1.0.11.RELEASE</version>
+		</dependency>
+
 		<dependency>
 			<groupId>io.projectreactor</groupId>
 			<artifactId>reactor-test</artifactId>
@@ -143,6 +149,14 @@
 							</execution>
 						</executions>
 					</plugin>
+					<plugin>
+						<groupId>org.apache.maven.plugins</groupId>
+						<artifactId>maven-surefire-plugin</artifactId>
+						<version>2.22.2</version>
+						<configuration>
+							<argLine>-XX:+AllowRedefinitionToAddDeleteMethods</argLine>
+						</configuration>
+					</plugin>
 				</plugins>
 			</build>
 		</profile>

src/main/docker/Dockerfile.jvm

@@ -1,9 +1,9 @@
-FROM maven:3.8.8-eclipse-temurin-17 as build
+FROM maven:3.8.8-eclipse-temurin-21 as build
 WORKDIR /app
 COPY ../../.. ./
 RUN mvn clean package --file pom.xml
 
-FROM eclipse-temurin:17-jdk-jammy
+FROM eclipse-temurin:21-jdk-alpine
 ENV RUNTIME_PLATFORM=JVM
 COPY --from=build /app/target/spring-redis-websocket-*.jar app.jar
 ENTRYPOINT ["java","-jar","/app.jar"]

src/main/docker/Dockerfile.native

@@ -1,4 +1,4 @@
-FROM ghcr.io/graalvm/native-image-community:17 as build
+FROM ghcr.io/graalvm/native-image-community:21 as build
 WORKDIR /app
 COPY ../../.. ./
 RUN ./mvnw -Pnative clean package -DskipNativeImage=false --file pom.xml

src/main/docker/docker-compose.yml

@@ -35,14 +35,15 @@ services:
       - 'redis_data:/bitnami/redis/data'
 
   spring-chat-jvm:
-    image: rawsanj/spring-redis-websocket:3.2.0-jvm
+    image: rawsanj/spring-redis-websocket:3.4.4-jvm
     restart: unless-stopped
     labels:
       - traefik.http.routers.chat.rule=PathPrefix(`/`) || Host(`chat.docker.localhost`) # PathPrefix(`/`) rule is helpful when running on play-with-docker.com to access chat app directly on port 80
       - traefik.http.services.chat-service.loadbalancer.server.port=8080
     environment:
       - SPRING_DATA_REDIS_HOST=redis
       - SPRING_DATA_REDIS_PASSWORD=SuperSecretRedisPassword
+      - RUNTIME_PLATFORM=JVM
     ports:
       - "8080"
     depends_on:
@@ -51,14 +52,15 @@ services:
       replicas: 2
 
   spring-chat-native:
-    image: rawsanj/spring-redis-websocket:3.2.0-native
+    image: rawsanj/spring-redis-websocket:3.4.4-native
     restart: unless-stopped
     labels:
       - traefik.http.routers.chat.rule=PathPrefix(`/`) || Host(`chat.docker.localhost`) # PathPrefix(`/`) rule is helpful when running on play-with-docker.com to access chat app directly on port 80
       - traefik.http.services.chat-service.loadbalancer.server.port=8080
     environment:
       - SPRING_DATA_REDIS_HOST=redis
       - SPRING_DATA_REDIS_PASSWORD=SuperSecretRedisPassword
+      - RUNTIME_PLATFORM=NATIVE
     ports:
       - "8080"
     depends_on: