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copied!<p>Ok people. Thanks to aoi222 and Kely French mainly, but thanks to anyone else. I found the solution which is:</p> <p>1.- Obviously you need to create a thread that serves a client exclusively. First time the client connects to the server to a general port. This create a thread listening to a particular port and let the client know which the new port, the new thread will be listening to. Then the client change its port and create a new socket to start the conversation with the client.</p> <p>2.- The server, running as a separate thread, must keep listening to a loop as aoi222 indicated for ever. The accept is just out of the loop for the exclusive thread which has been assigned a client. Please see the code below and sorry for the name of the variables as they are a bit confusing:</p> <pre><code> fromClient = server.accept(); clientInput = new ObjectInputStream (fromClient.getInputStream()); serverOutput = new ObjectOutputStream (fromClient.getOutputStream()); Hello received; while ( (received = (Hello)clientInput.readObject()) != null ) { received.setHello("pepito grillo"); serverOutput.writeObject(received); } </code></pre> <p>3.- Please see that the main thread server DO need to have the server.accept within the loop in order to accept new clients connection</p> <pre><code> for (;;) { newClient = mainServer.accept(); new exclusiveThread ().start () } </code></pre> <p>"exclusiveThread" is a thread that implements the code in 2.</p> <p><strong>Edited:</strong> I forgot to say that the client must send a end message for the server to identify that the conversation has finished and stop the lopp. Otherwise it will result in a java.io.EOFException.</p> <p>Thanks guys a lot for your help.</p>

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