MyEndpointByteArrayClient.java

package org.javaee7.websocket.endpoint;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.concurrent.CountDownLatch;

import javax.websocket.ClientEndpoint;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;

/**
 * @author Arun Gupta
 */
@ClientEndpoint
public class MyEndpointByteArrayClient {
    public static CountDownLatch latch;
    public static byte[] response;

    @OnOpen
    public void onOpen(Session session) {
        try {
            session.getBasicRemote().sendBinary(ByteBuffer.wrap("Hello World!".getBytes()));
        } catch (IOException ioe) {
            ioe.printStackTrace();
        }
    }
    
    @OnMessage
    public void processMessage(byte[] message) {
        response = message;
        latch.countDown();
    }
}