4.0.0 org.springframework.boot spring-boot-starters ${revision} spring-boot-starter-websocket Spring Boot WebSocket Starter Starter for building WebSocket applications using Spring Framework's WebSocket support ${basedir}/../../.. org.springframework.boot spring-boot-starter org.springframework.boot spring-boot-starter-web org.springframework spring-messaging org.springframework spring-websocket org.basepom.maven duplicate-finder-maven-plugin duplicate-dependencies validate check javax.annotation.*