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
    }
}