application en j2me sur pda

j'ai essayé le code suivant:
import java.io.*;
import javax.microedition.io.*;
import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;

public class maClasse extends MIDlet implements CommandListener {

    private Display display;

///////// variables formulaire /////////
    Form formulaire = null;
    TextField login = null;
    TextBox txtResults = null;

    private Command cmdSubmit;
    private Command cmdBack;
    private Command cmdExit;
//////////// fin ///////////////////////

    String url = "http://127.0.0.1/test.php?login=monlogin&pass=monpass";

    public maClasse() {
       display = Display.getDisplay(this);
///////////////////////
       cmdSubmit = new Command("Valider", Command.SCREEN, 1);
       cmdBack = new Command("Retour", Command.BACK, 0);
       cmdExit = new Command("Quitter", Command.EXIT, 1);
///////////////////////
    }

    public void startApp() {
//////////////////////
      formulaire = new Form("monsite : test");
      
      login = new TextField("Entrez votre login :", null, 50, TextField.ANY);
      formulaire.append(login);

      formulaire.addCommand(cmdSubmit);
      formulaire.addCommand(cmdExit);
      formulaire.setCommandListener(this);
      display.setCurrent(formulaire);
/////////////////////
    }

    public void pauseApp() {}
    public void destroyApp(boolean unconditional) {}

    void connectURL(String url) throws IOException {
        HttpConnection connection = null;
        InputStream is = null;
        OutputStream os = null;
        StringBuffer stringBuffer = new StringBuffer();
        TextBox textBox = null;

        try {
          connection = (HttpConnection) Connector.open(url);
          connection.setRequestMethod(HttpConnection.GET);
          connection.setRequestProperty("IF-Modified-Since","20 Jan 2001 16:19:14 GMT");
          connection.setRequestProperty("User-Agent","Profile/MIDP-2.0 Configuration/CLDC-1.0");
          connection.setRequestProperty("Content-Language", "en-EN");
          connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");

          os = connection.openOutputStream();
          is = connection.openDataInputStream();
          int ch;

          while ((ch = is.read()) != -1) {
            stringBuffer.append((char) ch);
          }

          textBox = new TextBox("Connexion...", stringBuffer.toString(), 1024, 0);

        }
        finally {
          if(is!= null) {
             is.close();
          }
          if(os != null) {
             os.close();
          }
          if(connection != null) {
             connection.close();
          }
        }
        display.setCurrent(textBox);
    }

    public void commandAction(Command c, Displayable d)  {

      String str = c.getLabel();

      if (str.equals("Quitter")) {
         destroyApp(true);
         return;
      }
      else if (str.equals("Retour")) {
         display.setCurrent(formulaire);
         return;
      }
//////////// appel de connectURL ////////
      try {
        connectURL(url);
      }
      catch (IOException e) {
        System.out.println("IOException " + e);
        e.printStackTrace();
      }
////////////////////////////////////////
    }
}
le message suivant s'affiche :
To avoid potential deadlock, operations that may block, such as
networking, should be performed in a different thread than the
commandAction() handler.
et je doit avoir un champ pour la saisie.