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POClient/server Swing program getting stuck when using Threads
 

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    <p>I have a problem with my Java program. I have this codes:</p> <p><strong>Host.java</strong>:</p> <pre><code>public class Host { protected static void start(JFrame window) { ServerSocket server = null; try { server = new ServerSocket(); SocketAddress addr = new InetSocketAddress(hostname, port); server.bind(addr); Socket socket = server.accept(); window.setVisible(false); Thread thread = new Thread(new Incomming(socket.getInputStream())); thread.start(); thread.join(); socket.close(); } catch (UnknownHostException e) { [...] } } </code></pre> <p><strong>Incomming.java</strong>:</p> <pre><code>public class Incomming implements Runnable { private DataInputStream is; public Incomming(InputStream is) { MyFrame frame = new MyFrame(); frame.setVisible(true); frame.pack(); this.is = new DataInputStream(is); } public void run() { try { while(!Thread.currentThread().isInterrupted()) { int n = is.readInt(); if(n == -1) { break; } byte[] b = new byte[n]; is.readFully(b); [...] // working with bytes } System.out.println("Stream closed."); } catch(IOException e) { [...] } } } </code></pre> <p><strong>Client.java</strong> is very similar to Host.java, it uses Incomming.java for socket.getInputStream() too.</p> <p>So the problem is: the client connects to the host, but when it should show on server side and also on client side the MyFrame window, it doesn't load it fully. And the close button of old JFrame windows (on both sides) doesn't do anything. </p> <p>I tried to remove the line with <code>thread.join()</code>, and then the MyFrame window loads completely and close buttons work, but it throws me exception with <code>socket closed</code> message, so the client is no longer connected to the host.</p> <p>How could I fix this problem? Thanks for replies.</p>
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    1. COIf both client and server are using `Incomming`, then the first thing they both try to do is read from the input stream. Of course that will deadlock if nobody writes to the stream first... And what's the point in starting a new thread and then immediately call join on it?
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    2. COfirst I'm wondering about running thread and just join for it!!! so it doesn't make sense use threads here , the GUI is because your GUI thread is run as same as _working with bytes_ process, so run the _byte process_ with another thread and let GUI has its thread too.
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    3. COIt is GUI code with 'join()' in it, so almost certain to fail. If it was a console app, join() has only an average chance of causing problems.
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      1. USMartin James
 

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