Проблема с IP-сокетами Java

Question

Я разработал простое клиентское приложение сокет-сервер. Только когда я запускаю проект, он работает, только если код находится в методе run, а IP-адрес уже определен в коде. Я нашел исправление, которое позволит мне самому ввести IP-адрес, однако он очень темпераментный и часто терпит неудачу, за исключением ниже.

package nxs;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.net.Socket;
import javax.swing.JOptionPane;
import static nxs.nx.s;

/**
 *
* @author kyleg
*/
public class control extends javax.swing.JFrame {
static Socket s;


static DataOutputStream dout;
static DataInputStream din;
/**
 * Creates new form contol
 */
public control() {
    initComponents();
}

/**
 * This method is called from within the constructor to initialize the form.
 * WARNING: Do NOT modify this code. The content of this method is always
 * regenerated by the Form Editor.
 */
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">                          
private void initComponents() {

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
    getContentPane().setLayout(layout);
    layout.setHorizontalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGap(0, 400, Short.MAX_VALUE)
    );
    layout.setVerticalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGap(0, 300, Short.MAX_VALUE)
    );

    pack();
}// </editor-fold>                        

/**
 * @param args the command line arguments
 */
public static void main(String args[]) {
    /* Set the Nimbus look and feel */
    //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
    /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
     * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
     */
    try {
        for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
            if ("Nimbus".equals(info.getName())) {
                javax.swing.UIManager.setLookAndFeel(info.getClassName());
                break;
            }
        }
    } catch (ClassNotFoundException ex) {
        java.util.logging.Logger.getLogger(control.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (InstantiationException ex) {
        java.util.logging.Logger.getLogger(control.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (IllegalAccessException ex) {
        java.util.logging.Logger.getLogger(control.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (javax.swing.UnsupportedLookAndFeelException ex) {
        java.util.logging.Logger.getLogger(control.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    }
    //</editor-fold>
    //</editor-fold>

    /* Create and display the form */
    java.awt.EventQueue.invokeLater(new Runnable() {
        public void run() {
            new control().setVisible(true);
        }
    }); String msgin = "";
    String serverAddress = JOptionPane.showInputDialog(
        "Enter IP Address of a machine that is\n" +
        "running the date service on port 1201:");


  if(!serverAddress.equals("")){try{


        s = new Socket(serverAddress,1201);

        din = new DataInputStream(s.getInputStream());
        dout = new DataOutputStream(s.getOutputStream());


        while(!msgin.equals("exit")){

        msgin = din.readUTF();


        }



    }
    catch(Exception e){}}
}

// Variables declaration - do not modify                     
// End of variables declaration                   
}

Исключение:

Исключение в потоке "AWT-EventQueue-0" java.lang.NullPointerException в javax.swing.plaf.nimbus.NimbusStyle.validate (NimbusStyle.java:298) в javax.swing.plaf.nimbus.NimbusStyle.getValues ​​(NimbusStyle.java:806) в javax.swing.plaf.nimbus.NimbusStyle.getInsets (NimbusStyle.java:485) в javax.swing.plaf.synth.SynthStyle.installDefaults (SynthStyle.java:913) в javax.swing.plaf.synth.SynthLookAndFeel.updateStyle (SynthLookAndFeel.java:265) в javax.swing.plaf.synth.SynthPanelUI.updateStyle (SynthPanelUI.java:117) в javax.swing.plaf.synth.SynthPanelUI.installDefaults (SynthPanelUI.java:100) в javax.swing.plaf.basic.BasicPanelUI.installUI (BasicPanelUI.java:56) в javax.swing.plaf.synth.SynthPanelUI.installUI (SynthPanelUI.java:62) в javax.swing.JComponent.setUI (JComponent.java:666) в javax.swing.JPanel.setUI (JPanel.java:153) в javax.swing.JPanel.updateUI (JPanel.java:126) в javax.swing.JPanel. (JPanel.java:86) в javax.swing.JPanel. (JPanel.java:109) в javax.swing.JPanel. (JPanel.java:117) в javax.swing.JRootPane.createGlassPane (JRootPane.java:546) в javax.swing.JRootPane. (JRootPane.java:366) в javax.swing.JFrame.createRootPane (JFrame.java:286) в javax.swing.JFrame.frameInit (JFrame.java:267) в javax.swing.JFrame. (JFrame.java:190) в nxs.control. (control.java:27) в nxs.control $ 1.run (control.java:87) в java.awt.event.InvocationEvent.dispatch (InvocationEvent.java:311) в java.awt.EventQueue.dispatchEventImpl (EventQueue.java:756) в java.awt.EventQueue.access $ 500 (EventQueue.java:97) в java.awt.EventQueue $ 3.run (EventQueue.java:709) в java.awt.EventQueue $ 3.run (EventQueue.java:703) в java.security.AccessController.doPrivileged (собственный метод) в java.security.ProtectionDomain $ JavaSecurityAccessImpl.doIntersectionPrivilege (ProtectionDomain.java:80) в java.awt.EventQueue.dispatchEvent (EventQueue.java:726) в java.awt.EventDispatchThread.pumpOneEventForFilters (EventDispatchThread.java:201) в java.awt.EventDispatchThread.pumpEventsForFilter (EventDispatchThread.java:116) в java.awt.EventDispatchThread.pumpEventsForHierarchy (EventDispatchThread.java:105) в java.awt.EventDispatchThread.pumpEvents (EventDispatchThread.java:101) в java.awt.EventDispatchThread.pumpEvents (EventDispatchThread.java:93) в java.awt.EventDispatchThread.run (EventDispatchThread.java:82) Исключение в потоке "main" java.lang.NullPointerException в nxs.control.main (control.java:95) C: \ Users \ kyleg \ AppData \ Local \ NetBeans \ Cache \ 8.2 \ исполнитель-сниппеты \ run.xml: 53: Ява вернулась: 1 СБОЙ СТРОИТ (общее время: 4 секунды)