4.0.0 org.springframework.boot spring-boot-starter-parent 3.4.4 com.websocket websocket 1.0.0 websocket Websocket start project 21 org.springframework.boot spring-boot-starter-web org.springframework.boot spring-boot-devtools runtime true org.springframework.boot spring-boot-starter-test test org.springframework.boot spring-boot-starter-websocket org.springframework.boot spring-boot-starter org.springframework.boot spring-boot-starter-actuator org.springframework.boot spring-boot-maven-plugin