Server / Client with Threads

[feda alshahwan]

I am creating simple server /client with threads but I have a problem it is not executable Could you tell me how to solve it please?here is the code:
package threadedwebserver;

import java.io.*;
import java.net.*;


/**
 *
 * @author fa00064
 */
public class ThreadedWebServer 
{


    // ServerSocket serverSocket;
    // Socket connection;
   
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        try
        {
         ServerSocket serverSocket=new ServerSocket(40000);
         System.out.println("My Server is waiting and listening to port 40000......");
         while (true)
         {
         Socket connetion=serverSocket.accept();
          System.out.println("My Server is connected to client through port: "+ serverSocket.getLocalPort());
          SocketThread t=new SocketThread(connection);
          t.start();

         }
        }
        catch (Exception e)
        {
         System.err.println(e);
        }

        // TODO code application logic here
    }
       class SocketThread extends Thread
    {
        Socket connection;
        SocketThread(Socket connection){
            this.connection=connection;
        }

    @Override
    public void run()
    {

        try
        {
          System.out.println("started the thread");
          ObjectOutputStream output = new ObjectOutputStream(connection.getOutputStream());
          ObjectInputStream input = new ObjectInputStream(connection.getInputStream());
          String message="Hello from Server";
          byte[] messageBytes=message.getBytes(message);
          output.writeObject(messageBytes);
          System.out.println("Message in Byte: " + messageBytes);
          input.close();
          output.close();
        }
        catch (IOException ex)
        {
          System.out.println(ex);
        }
    }
   }
}

[Joe Ess]

You need to tell us the details. What did you expect to happen? What actually happened?
Is this problem significantly different from the one you've posted over here?