How do I add in a MIDlet in a file like tis

Question

Hi all,
Im very new to J2ME....I get an error on :
Unable to create MIDlet EchoServer
java.lang.InstantiationException: Class not a MIDlet
     at com.sun.midp.midlet.MIDletState.createMIDlet(+51)
     at com.sun.midp.midlet.Selector.run(+22)
And here's my source code.....
package javax.bluetooth;
import javax.bluetooth.*;
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.io.*;
import java.io.*;
public class EchoServer extends MIDlet implements CommandListener, Runnable
     StreamConnectionNotifier notifier;
     StreamConnection conn;
     LocalDevice localDevice;
     ServiceRecord serviceRecord;
     InputStream input;
     OutputStream output;
     private Form serForm;
     private Command exitCommand = new Command("Exit", Command.EXIT, 1);
     private Display display;
     private boolean isInit;
     private static String serverUrl = "btspp://localhost:" + BluetoothEchoDemo.RFCOMM_UUID + ";name=rfcommtest;authorize=true";
     public EchoServer()
          display = Display.getDisplay(this);
          serForm = new Form("Server1");
          serForm.addCommand(exitCommand);
          serForm.setCommandListener(this);
          serForm.append(new StringItem(null, "\n\nServer Running..."));
     isInit = false;
     Thread thread = new Thread(this);
     thread.start();
     public void displayForm()
          display.setCurrent(serForm);
     public void startApp()
          displayForm();
     public void destroyApp(boolean unconditional){}
     public void pauseApp(){}
     public void commandAction(Command c, Displayable s)
          notifyDestroyed();
     public void run()
     if (!isInit)
          // Initialization is done in the thread to avoid dead lock 'isInit' ensures it is done once only
          try
          conn = null;
          localDevice = LocalDevice.getLocalDevice();
          localDevice.setDiscoverable( DiscoveryAgent.GIAC );
          notifier = (StreamConnectionNotifier)Connector.open(serverUrl);
          catch (BluetoothStateException e)
          System.err.println( "BluetoothStateException: " + e.getMessage() );
          catch (IOException e)
          System.err.println( "IOException: " + e.getMessage() );
          isInit=true;
          System.out.println( "Starting Echo Server" );
     try
          System.out.println("\n\nServer Running...");
          // Pauses thread until Transmission occurs
          conn = notifier.acceptAndOpen();
          // Read Data Transmission
          String msg = BluetoothEchoDemo.readData(conn);
          System.out.println("Received Message from Client: " + msg);
          // Send Back a Message
          msg = "Hello Back from Server";
          output = conn.openOutputStream();
          output.write(msg.length()); // length is 1 byte
          output.write(msg.getBytes());
          output.close();
     catch (Exception ex)
          System.err.println("Bluetooth Server Running Error: " + ex);
}

Answer 1

Hi,
http://java.sun.com/j2se/1.3/docs/tooldocs/win32/jar.html
http://bobcat.webappcabaret.net/javachina/faq/jar.htm
L.P.