[zeromq-dev] Client request and no answer from the Server

Anna anna at aphroditel.eu
Wed Oct 10 10:36:24 CEST 2012

Hi! I'm working on ZMQ, I have a class Client that should send 100 request 
to the server, you can see here both classes:

public class Client {

 public static void main(String[] args){

        // Prepare our context and socket

        ZMQ.Context context = ZMQ.context(1);

        ZMQ.Socket socket = context.socket(ZMQ.REQ);

        socket.connect ("tcp://localhost:5555");


        // Do 10 requests, waiting each time for a response

        for(int request_nbr = 0; request_nbr < 100; request_nbr++) {


            String requestString = "Hello World";


            byte[] request = requestString.getBytes();

            //request[request.length-1]=0; //Sets the last byte to 0

            // Send the message

            //System.out.println("Sending request " + request_nbr + "...");

            socket.send(request, 0)

            System.out.println("request sended");

            //  Get the reply.

            byte[] reply = socket.recv(0);

            final String value = new String(reply);

            System.out.println("answer " +value);



            //  When displaying reply as a String, omit the last byte 

            //  our "Hello World" server has sent us a 0-terminated string:

            //System.out.println("Received reply " + request_nbr + ": [" + 
new String(reply,0,reply.length-1) + "]");



public class Server {

 static ZMQ.Context context = ZMQ.context(1);

static ZMQ.Socket socket = context.socket(ZMQ.REP);


        public static void main(String[] args) {


         byte[] request;

            request = socket.recv (0);

            final String value = new String(request); 


         final Thread thread1 = new Thread( new Runnable() {

     public void run(){

     Producer producer = new Producer();






         //replyIp[replyIp.length-1]=0; Sets the last byte of the reply to 0



        public static void arreplegaDelServer(String loArreplegat){

         byte[] reply = loArreplegat.getBytes();




As you can see above, the class Server has a thread that does all the job 
and on the method arreplegaDelServer I get a reverse of the request done by 
the Client. My problem is when I run it the program, the Client makes the 
first request it gets the answer from the Server, but when it does the 
second request I just get on my terminal the comment "request sended" but I 
don't get the comment "producer" which means that the request is on the 
thread1 or neither "answer" which show me the answer from the Server, so 
has anyone a clue about what is happening? Thanks! 

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