SSLServerSocket + SSLSocket stops the thread ?

Question

Hi
I'm really new to security issues. I'm trying to code a chat application with SSLServerSocket + SSLSocket as part of my project.
I can create server and client , there are no problems during connection establishment
but when connection is established and threads are started, connections for both parties is lost ?
here's my code for server side
SSLServerSocketFactory ssf = (SSLServerSocketFactory ) SSLServerSocketFactory.getDefault();
welcomeSocket = (SSLServerSocket) ssf.createServerSocket(7001);
final String[] enabledCipherSuites = { "SSL_DH_anon_WITH_RC4_128_MD5" };
welcomeSocket.setEnabledCipherSuites(enabledCipherSuites);
JOptionPane.showMessageDialog(null, "Now will wait for a connection");
connectionSocket = (SSLSocket) welcomeSocket.accept();
//create GUI
initComponents();
//create connections
initializeInputOutputStreams();
//start listening thread
new listen(inFromClient,outToClient,conversationField,serverip).start();here's my code for client side
serverip=JOptionPane.showInputDialog("Enter IP:","localhost");
SSLSocketFactory ssf = (SSLSocketFactory ) SSLSocketFactory.getDefault();     
connectionSocket = (SSLSocket) ssf.createSocket(serverip, 7001);
//create GUI
initComponents();
//create connections
initializeInputOutputStreams();
//start listening thread
new listen(inFromClient,outToClient,conversationField,serverip).start();and here's the listening thread
public class listen extends Thread
     //variables & constructor etc.
     public void run()
          while(true)
               try
               {     //read recieved message
                    recievedMessage = inFromClient.readLine();
               catch (IOException e)
                    //catch clause stuff here
               // if file transfer
               if (recievedMessage.startsWith("INCOMING FILE TRANSFER FROM REMOTE")) //here is the problem ? null pointer exception.
                    //file transfer stuff here
               else
                    //message stuff here
}I'ld really appreciate if you help

Answer 1

final String[] enabledCipherSuites = { "SSL_DH_anon_WITH_RC4_128_MD5" };
welcomeSocket.setEnabledCipherSuites(enabledCipherSuites);Why are you doing that? Don't. It's insecure.
JOptionPane.showMessageDialog(null, "Now will wait for a connection");
connectionSocket = (SSLSocket) welcomeSocket.accept();If this is happening in the AWT thread it will block and freeze your server GUI. Start a separate thread for accepting.
          while(true)
               try
               {     //read recieved message
                    recievedMessage = inFromClient.readLine();You're not testing for EOS here:
if (receivedMessage == null)
  break;