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JSR 356: Java API for WebSocket
There is a newer version: 1.1
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 * and Distribution License("CDDL") (collectively, the "License").  You
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package javax.websocket.server;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * 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 {@link 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
 *     }
 * }
 * 
 *
 * @author dannycoward
 */
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.PARAMETER)
public @interface PathParam {

    /**
     * The name of the variable used in the URI-template. If the name does
     * not match a path variable in the URI-template, the value of the method parameter
     * this annotation annotates is {@code null}.
     *
     * @return the name of the variable used in the URI-template.
     */
    public String value();
}