# 业务系统开启websocket
业务开启websocket有可能会报错： 
No 'javax.websocket.server.ServerContainer' ServletContext attribute. Are you running in a Servlet container that supports JSR-356?
 
如提示上面的错则需要修改pom.xml文件，去掉undertow的依赖

<dependency>
<groupId>org.springblade</groupId>
<artifactId>blade-common</artifactId>
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-undertow</artifactId>
</exclusion>
</exclusions>
</dependency>