Annotation Type PathParam

@Retention(value=RUNTIME)
 @Target(value=PARAMETER)
public @interface PathParam

This annotation may be used to annotate method parameters on server endpoints where a URI-template has been used in the path-mapping of the ServerEndpoint annotation. The method parameter may be of type String, any Java primitive type or any boxed version thereof. If a client URI matches the URI-template, but the requested path parameter cannot be decoded, then the websocket's error handler will be called.

For example:-

 @ServerEndpoint("/bookings/{guest-id}")
 public class BookingServer {
 
     @OnMessage
     public void processBookingRequest(@PathParam("guest-id") String guestID, String message, Session session) {
         // process booking from the given guest here
     }
 }
 

For example:-

 @ServerEndpoint("/rewards/{vip-level}")
 public class RewardServer {
 
     @OnMessage
     public void processReward(@PathParam("vip-level") Integer vipLevel, String message, Session session) {
         // process reward here
     }
 }