Spring Boot provides WebSockets auto-configuration for embedded Tomcat, Jetty, and Undertow. If you deploy a war file to a standalone container, Spring Boot assumes that the container is responsible for the configuration of its WebSocket support.
Spring Framework provides rich WebSocket support
for MVC web applications that can be easily accessed through the
WebSocket support is also available for
reactive web applications and
requires to include the WebSocket API alongside
<dependency> <groupId>javax.websocket</groupId> <artifactId>javax.websocket-api</artifactId> </dependency>