System.getProperty( "com.nokia.mid.imei" ) return null ?!?!

Question

hello guys,
i intend to get the IMEI No. i wrote the following code:
import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;
public class IMEIDemo extends MIDlet
     Display display;
     private Form mainForm;
     String imeiNokia = "";
     public void startApp()
          display = Display.getDisplay( this );
          mainForm = new Form( "IMEI Demo" );
          imeiNokia = System.getProperty( "com.nokia.mid.imei" );
          if( imeiNokia.compareTo( "" ) == 0 )
               System.out.println( "NULL..." );
          else
               mainForm.append( imeiNokia );
               display.setCurrent( mainForm );
     public void pauseApp()
     public void destroyApp( boolean b )
          destroyApp( false );
          notifyDestroyed();
} // IMEIDemoi am using WTK2.2, MIDP2, CLDC1.1
when i run this code in emulator (WToolKit), i got the following Exception:
startApp threw an Exception
java.lang.NullPointerException
java.lang.NullPointerException
     at IMEIDemo.startApp(+36)
     at javax.microedition.midlet.MIDletProxy.startApp(+7)
     at com.sun.midp.midlet.Scheduler.schedule(+270)
     at com.sun.midp.main.Main.runLocalClass(+28)
     at com.sun.midp.main.Main.main(+116)
would u pls suggest me how can i overcome this problem or any effective openion?
thanx in advance.
take care all.
bye.

Answer 1

hi
i tried this program using J2ME to retireve IMEI number
* IMEINO.java
* Created on February 19, 2007, 3:50 PM
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
* @author Administrator
* @version
public class IMEINO extends MIDlet implements CommandListener{
public TextField t1,t2,t3;
public Form form;
public String s1,s2,s3,n=null;
public Display disp;
public Command ok,exit;
public IMEINO()
form = new Form("IMEI");
t1 = new TextField("imei1","",50,TextField.ANY);
t2 = new TextField("imei2","",50,TextField.ANY);
t3 = new TextField("imei3","",50,TextField.ANY);
ok = new Command("ok",Command.OK,1);
exit = new Command("exit",Command.EXIT,2);
public void startApp() {
form.addCommand(ok);
form.setCommandListener(this);
form.addCommand(exit);
form.setCommandListener(this);
form.append(t1);
form.append(t2);
form.append(t3);
Display disp = Display.getDisplay(this);
try
s1 = System.getProperty("com.nokia.mid.imei");
s2 = System.getProperty("phone.imei");
s3 = System.getProperty("com.nokia.IMEI");
if(s1.compareTo("") == 0 || s2.compareTo("")==0 || s3.compareTo("")==0 )
t1.setString(null);
else
t1.setString(s1);
t2.setString(s2);
t3.setString(s3);
catch(Exception e)
t1.setString("error"+ e.getMessage());
t2.setString(s2);
t3.setString(s3);
disp.setCurrent(form);
public void commandAction(Command c,Displayable d)
if(c==ok)
destroyApp(true);
notifyDestroyed();
if(c == exit)
destroyApp(true);
notifyDestroyed();
public void pauseApp() {
public void destroyApp(boolean unconditional) {
i tried this program , when i run in the netbeans environment , it shows null (system.out.println(imei)),when i installed the jar file into nokia 3230 mobile,the textfield is null , it shows nothing,can anyone give me any suggestion , whether i have to change my phone settings
Message was edited by:
scorpianalways