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JSR 356: Java API for WebSocket
There is a newer version: 1.1
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package javax.websocket;

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

/**
 * The ClientEndpoint annotation a class level annotation is used to denote that a POJO
 * is a web socket client and can be deployed as such. Similar to
 * {@link javax.websocket.server.ServerEndpoint}, POJOs that are
 * annotated with this annotation can have methods that, using the web socket method level annotations,
 * are web socket lifecycle methods.

 * 
 * For example:
 * 
 * 
 *
 *  @ClientEndpoint(subprotocols="chat")
 * public class HelloServer {
 *
 *   @OnMessage
 *  public void processMessageFromServer(String message, Session session) {
 *    System.out.println("Message came from the server ! " + message);
 *  }
 * }
 * 
 * 
 *
 * @author dannycoward
 * @since version 008
 */

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.TYPE)
public @interface ClientEndpoint {

    /**
     * The names of the subprotocols this client supports.
     *
     * @return the array of names of the subprotocols.
     */
    String[] subprotocols() default {};

    /**
     * The array of Java classes that are to act as Decoders for messages coming into
     * the client.
     *
     * @return the array of decoders.
     */
    Class[] decoders() default {};

    /**
     * The array of Java classes that are to act as Encoders for messages sent by the client.
     *
     * @return the array of decoders.
     */
    Class[] encoders() default {};
    
    /**
     * An optional custom configurator class that the developer would like to use
     * to provide custom configuration of new instances of this endpoint. The implementation
     * creates a new instance of the configurator per logical endpoint.
     *
     * @return the custom configurator class, or ClientEndpointConfigurator.class
     * if none was provided in the annotation.
     */
    public Class configurator() default ClientEndpointConfigurator.class;
}