问题描述：spring boot接入websocket时，启动报错：javax.websocket.server.ServerContainer not available

org.springframework.boot spring-boot-starter-websocket

原因：因为spring boot内带tomcat，tomcat中的websocket会有冲突。
解决办法：spring boot启动时排除tomcat依赖包即可:

org.springframework.boot spring-boot-starter-web org.springframework.boot spring-boot-starter-tomcat
org.springframework.boot spring-boot-starter-undertow