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    <p>I see your code single thread, no sign of other thread, everything is run by main thread, second I a little confused about some parts, first you flush the output just after you get it, I mean you do not send anything but flush it!</p> <pre><code>out = new ObjectOutputStream(this.connection.getOutputStream()); out.flush(); </code></pre> <p>so how do you see your application run parallel?!</p> <p>and about the running the connection process in another thread(and single), it's not a very hard job, first implement the Runnable interface, and let the run method handles the connection processing.</p> <pre><code>public class Provider implements Runnable { ... public void run(){//manages the connection but ONE at a time. while(true){ server.run(); } } public static void main(String[] arg){ Provider server = new Provider(); new Thread(this).start();//start the connection processing with another thread. } ... } </code></pre> <p>also you would have a simple <a href="http://arashmd.blogspot.com/2013/06/java-threading.html" rel="nofollow">thread tutorial here</a>. have a good parallel program dude :)</p> <p><strong>UPDATE:</strong> and for refusing the second ones (with some message) while the first one is in the process, so this is not a hard job too, but the first thing is making the process parallel, for doing this, I put(cut) the main method into another class, and let the Provider class handles the requests, also KEEP the ServerSocket(port) OEPN.</p> <pre><code>import java.awt.Desktop; import java.io.*; import java.lang.reflect.Array; import java.net.*; import java.util.ArrayList; import javax.swing.JOptionPane; import javax.swing.JTextField; public class Provider implements Runnable { // ServerSocket providerSocket; Socket connection = null; ObjectOutputStream out; String ocupado = "0"; ObjectInputStream in; String caminhodoarquivo; Provider(Socket s){this.connection=s;} @Override public void run() { try{ out = new ObjectOutputStream(this.connection.getOutputStream()); //out.flush(); sendMessage(ocupado); in = new ObjectInputStream(connection.getInputStream()); System.out.println("Certidão de: " + connection.getInetAddress().getHostName()); String ocupado = "1"; try{ caminhodoarquivo = (String)in.readObject(); System.out.println("Certidão: " + caminhodoarquivo); JTextField paginainicial = new JTextField(); JTextField paginafinal = new JTextField(); Object[] message = { "Número da Primeira Folha: ", paginainicial, "Número Última Folha: ", paginafinal, }; int option = JOptionPane.showConfirmDialog(null, message, "Dados da Certidão", JOptionPane.OK_CANCEL_OPTION); ocupado = "1"; if (option == JOptionPane.OK_OPTION) { String primeirafolha = paginainicial.getText(); String ultimafolha = paginafinal.getText(); metodos metodosBD = new metodos(); metodosBD.atualizafolha(primeirafolha, ultimafolha, caminhodoarquivo); System.out.println("Dados inseridos."); Desktop.getDesktop().print(new File(caminhodoarquivo)); ocupado = "0"; }else {System.out.println("Certidão Cancelada.");} }catch(ClassNotFoundException classnot){ System.err.println("Data received in unknown format"); out.close(); in.close(); connection.close(); } } catch(IOException ioException){ioException.printStackTrace();} finally{ Server.setFree();//Tells server the system is ready for new connection. //4: Closing connection try{ in.close(); out.close(); connection.close(); } catch(IOException ioException){ ioException.printStackTrace(); } } } void sendMessage(String msg) { try{ out.writeObject(msg); out.flush(); } catch(IOException ioException){ ioException.printStackTrace(); } } // public static void main(String args[]) // { // Provider server = new Provider(); // while(true){ // server.run(); // } // } } </code></pre> <p>NOTE: this one response "Error -> Server is busy" as a String when server is busy, so client needs to check if server response single string "Error -> Server is busy" it means server didn't response anything else.</p> <pre><code>class Server implements Runnable{ private final String serverBusyMessage="Error -&gt; Server is busy"; private ServerSocket ss; private static volatile boolean busy=false; public static void setFree(){busy=false;} public void run(){ while(true){ try{Socket s=ss.accept(); if(busy){//if there is one connection processing. ObjectOutputStream out=new ObjectOutputStream(s.getOutputStream()); out.writeObject(serverBusyMessage); out.flush(); s.close();continue; } System.out.println("---------------Aguardando por certidões----------------"); new Thread(new Provider(s)).start(); busy=true; }catch(Exception e){} } } private Server(){try{ss=new ServerSocket(2004);}catch(Exception ex){}} public static void main(String[] arg){ Server server = new Server(); new Thread(server).start(); } } </code></pre>
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    1. COthe out.flush was that previsoly i was using the SendMessage in the end, but i removed it, i forget to remove the out ;x sorry!! thanks a lot the lesson :)
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    2. COno problem, I hope I could help, has issue solved?!
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    3. COno, when i connectwith my client one program, and in the server it pop up the JOPTION.showConfirm, i dont close it, so i try another connection, it still possible to connect =/, it will return a error in the second client, when the Server Close the ConfirmDialog and finish everything with the First, i need something to refuse the connection of the Second Client while the First one dont finish =(
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