Tomcat启动报错：More than one fragment with the name [org_apache_tomcat_websocket]

SpringBoot项目，本机运行正常，打war包放到服务器的Tomcat中之后无法访问，404.

查看了Tomcat的catalina.日志，发现报错：

More than one fragment with the name [org_apache_tomcat_websocket] was found.This is not legal with relative ordering. See section 8.2.2 2c of the Servlet specification for details. Consider using absolute ordering.

解决办法：把Tomcat7 换成Tomcat8

问题解决。