router-dealer example missing messages.

import org.zeromq.ZMQ;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;

public class RouterDealerExample {

    static final String URI = "tcp://127.0.0.1:55552";

    static final AtomicBoolean finished = new AtomicBoolean(false);

    static final AtomicInteger SENT = new AtomicInteger(0);
    static final AtomicInteger RECEIVED = new AtomicInteger(0);

    static AtomicInteger connectedCount = new AtomicInteger(0);

    /**
     * Worker runnable consumes messages until it receives an END
     * message.
     */
    public static class Client implements Runnable {
        public final String name;

        Client(String name) {
            this.name = name;
        }

        public void run() {
            ZMQ.Context context = ZMQ.context(1);
            ZMQ.Socket socket = context.socket(ZMQ.DEALER);
            socket.setIdentity(name.getBytes());
            socket.connect(URI);

            // Option 2. Send a message through to connect fully.
            // socket.send("".getBytes(), 0);

            connectedCount.incrementAndGet();
            System.out.println("Connected-count=" + connectedCount.get());

            while (!finished.get()) {
                byte[] data = socket.recv(0);
                RECEIVED.incrementAndGet();
                String msg = new String(data);
                System.out.println(String.format("[" + RECEIVED.get() + "/" + SENT.get() + "]Worker %s received '%s'", name, msg));
            }

            socket.close();
            context.term();
        }
    }

    private static void initClients() {
        for (int i = 0; i < clientCount; i++) {
            Thread workerA = new Thread(new Client("client-" + i));
            workerA.start();
        }
    }

    static int clientCount = 50;

    private static void initServer() throws Exception {
        new Thread() {
            @Override
            public void run() {
                ZMQ.Context context = null;
                ZMQ.Socket socket = null;
                try {
                    context = ZMQ.context(1);
                    socket = context.socket(ZMQ.ROUTER);
                    socket.bind(URI);

                    // Option 2.
                    // socket.send("".getBytes(), 0);

                    // Option 1. this will work usually, to ensure endpoints are connected.
                    //  Thread.sleep(100);

                    while (connectedCount.get() < clientCount) {
                        Thread.sleep(10);
                        System.out.println("Waiting for connections ...");
                    }

                    // Send 10 tasks, scattered to A twice as often as B.
                    for (int i = 0; i < 10; i++) {
                        for (int j = 0; j < clientCount; j++) {
                            SENT.incrementAndGet();
                            socket.send(("client-" + j).getBytes(), ZMQ.SNDMORE);
                            socket.send(("Workload[" + i + "/total-sent=" + SENT.get() + "] for client-" + j).getBytes(), 0);
                        }
                    }

                    Thread.sleep(1000); // let messages send and arrive.
                    System.out.println("Total counts [sent=" + SENT.get() + ", received=" + RECEIVED.get() + "]");
                } catch (Exception e) {
                    System.out.println("Failed");
                    e.printStackTrace(System.err);
                } finally {
                    socket.close();
                    context.term();
                }
            }
        }.start();
    }

    public static void main(String[] args) throws Exception {
        initServer();
        initClients();
    }
}