multithreading - Working on a java based chatting application using threading

I was trying to send message through threading. dataAvailable is a variable which tells whether message is available on textfield or not. if available dataAvailable is set to true and in run() method if it is true following code is executed. But the problem is in run() it never sees dataAvailable is true and nothing is sent. Help needed.

/*

This is client

*/ 
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.Socket;
import java.net.UnknownHostException;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;


public class PeerOne extends JFrame implements Runnable
{
    private static final long serialVersionUID = 1L;

    JTextField outgoing;
    JTextArea incoming;
    JButton send;
    Thread t,t1;
    ObjectOutputStream output;  //for writing objects to a stream

    ObjectInputStream input;    //for reading objects from a stream
    Socket s;
    volatile boolean dataAvailable=false;
    String message = null;
    public PeerOne()
    {
        outgoing = new JTextField();
        outgoing.setEnabled(true);
        outgoing.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {

                if(!(e.getActionCommand().isEmpty()))
                {
                    dataAvailable = true;
                    System.out.print("hi");
                }
            }
        });

        this.add(outgoing,BorderLayout.SOUTH);


        incoming = new JTextArea();
        incoming.setEditable(true);
        this.add(new JScrollPane(incoming),BorderLayout.CENTER);
        this.add(incoming);

        setSize(300,150);
        setVisible(true);

        try
        {

            s = new Socket("localhost",5500);
            incoming.append("Connection Successfull..."+"\n");

            output = new ObjectOutputStream(s.getOutputStream());
            output.flush();
            input = new ObjectInputStream(s.getInputStream());

        }
        catch (UnknownHostException e)
        {

            e.printStackTrace();
        }
        catch (IOException e) 
        {
            e.printStackTrace();
        }

        t = new Thread(this,"PeerOne");
        System.out.print("New Thread");
        //t1 = new Thread(this,"Two");

        t.start();
    }

    public static void main(String[] args) 
    {
        new PeerOne();
    }

    public void run()
    {   

        while(true)
        {
            if(dataAvailable==true)
            {
                try 
                {
                    System.out.print(0);
                    output.writeObject(outgoing.getText());
                    output.flush();
                    dataAvailable = false;

                }
                catch (IOException e1) 
                {
                    e1.printStackTrace();
                }
            }
            try 
            {
                try 
                {

                    message = (String)input.readObject();

                    incoming.append(message);
                }
                catch (ClassNotFoundException e) 
                {
                    e.printStackTrace();
                }
            } catch (IOException e) {
                e.printStackTrace();

            }       
        }

    }
}

/*


This is server

*/
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.ObjectInputStream;

import java.io.ObjectOutputStream;
import java.io.PrintStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.UnknownHostException;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;

import javax.swing.JTextField;

public class PeerTwo extends JFrame implements Runnable
{
    private static final long serialVersionUID = 1L;
    JTextField outgoing;
    JTextArea incoming;
    JButton send;
    Thread t;
    Socket s;   

    ObjectOutputStream output;  //for writing objects to a stream
    ObjectInputStream input;    //for reading objects from a stream
    volatile boolean dataAvailable=false;
    String message = null;

    public PeerTwo()
    {
        outgoing = new JTextField();
        outgoing.setEnabled(true);
        outgoing.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent e) {
                if(!(e.getActionCommand().isEmpty()))
                {
                    dataAvailable = true;
                }
            }
        });

        this.add(outgoing,BorderLayout.SOUTH);


        incoming = new JTextArea();
        incoming.setEditable(true);
        this.add(new JScrollPane(incoming),BorderLayout.CENTER);
        this.add(incoming);

        setSize(300,150);
        setVisible(true);
        try
        {
            ServerSocket ss = new ServerSocket(5500,100);

            s = ss.accept();

            output = new ObjectOutputStream(s.getOutputStream());
            output.flush();
            input = new ObjectInputStream(s.getInputStream());
        }
        catch (UnknownHostException e)
        {
            e.printStackTrace();
        }

        catch (IOException e) 
        {
            e.printStackTrace();
        }

        t = new Thread(this,"PeerTwo");
        System.out.print("New Thread");
        t.start();




    }

    public static void main(String[] args)
    {
        new PeerTwo();
    }

    public void run() 
    {

            while(true)
            {
                if(dataAvailable==true)
                {
                    try 
                    {
                        System.out.print("bbb");
                        output.writeObject(outgoing.getText());
                        output.flush();
                        dataAvailable = false;

                    }
                    catch (IOException e1) 
                    {
                        e1.printStackTrace();
                    }
                }
                try {
                        try 
                        {
                            message = (String)input.readObject();

                            System.out.print(0);
                            incoming.append(message);
                        }
                        catch (ClassNotFoundException e) 
                        {
                            e.printStackTrace();
                        }
                } catch (IOException e) {
                    e.printStackTrace();
                }       

            }
        }
}