Caused by: java.lang.ClassCastException: io.undertow.websockets.jsr.ServerWebSocketContainer cannot be cast to org.apache.tomcat.websocket.server.WsServerContainer
at org.springframework.web.socket.server.standard.TomcatRequestUpgradeStrategy.getContainer(TomcatRequestUpgradeStrategy.java:84)
at org.springframework.web.socket.server.standard.TomcatRequestUpgradeStrategy.getContainer(TomcatRequestUpgradeStrategy.java:47)
at org.springframework.web.socket.server.standard.AbstractStandardUpgradeStrategy.getSupportedExtensions(AbstractStandardUpgradeStrategy.java:88)
at org.springframework.web.socket.server.support.AbstractHandshakeHandler.doHandshake(AbstractHandshakeHandler.java:272)
at org.springframework.web.socket.server.support.WebSocketHttpRequestHandler.handleRequest(WebSocketHttpRequestHandler.java:166)
... 56 common frames omitted
问题产生原因是：pom引入的依赖包undertow与websocket依赖包中的tomcat冲突了导致,如下：
org.springframework.boot
spring-boot-starter-undertow
org.springframework.boot
spring-boot-starter-websocket
解决方案：
org.springframework.boot
spring-boot-starter-websocket
org.springframework.boot
spring-boot-starter-tomcat
Original: https://www.cnblogs.com/liaojie970/p/10430610.html
Author: 山高我为峰
Title: io.undertow.websockets.jsr.ServerWebSocketContainer cannot be cast to org.apache.tomcat.websocket.server.WsServerContainer
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