websocket ServerEndpoint

The @ServerEndpoint annotation is used in Java to mark a class as a WebSocket endpoint on the server side. This annotation is used in conjunction with the javax.websocket package to create a WebSocket server that can handle incoming WebSocket connections and messages.

When a class is annotated with @ServerEndpoint, it must have at least one method annotated with @OnOpen, @OnMessage, @OnClose, or @OnError. These methods handle incoming WebSocket events such as connection opening, message receiving, connection closing, and error handling.

The @ServerEndpoint annotation also allows you to specify the URI path for the WebSocket endpoint, which is the URL that clients will use to connect to the server. For example, @ServerEndpoint("/mywebsocket") would create a WebSocket endpoint at the URL ws://localhost:8080/myapp/mywebsocket.

Overall, the @ServerEndpoint annotation is a key component in creating a WebSocket server in Java. It allows you to easily define and handle incoming WebSocket connections and messages on the server side