Cannot display the image in Login Screen

Question

Hi am new J2ME..
Here i have created a basic application of Login Screen in J2ME..i have added image in folder of my project..am using netbeans environment for this J2ME.,while am running my program it's not displaying image..
here,if login is successfull,it will display 1 image,or else it will display another image..
error displaying while am running this project.
CODING
public HelloMIDlet() {
try{
      img1 = Image.createImage("images.jpg");
    }catch(Exception e){
      System.out.println(e.getMessage());
public void validateUser(String name, String password) {
    if (name.equals("mani") && password.equals("mani")) {
      showMsg();
    } else {
      tryAgain();
public void showMsg() {
    Alert success = new Alert("Login Successfully","Your Login Process is completed!",img1, AlertType.INFO);
    success.setImage(img1);
    textField.setString("");
    textField1.setString("");
    display.setCurrent(success, form);
  public void tryAgain() {
    Alert error = new Alert("Login Incorrect", "Please try again", img1, AlertType.ERROR);
        error.setTimeout(900);
    error.setImage(img1);
    textField.setString("");
    textField1.setString("");
    display.setCurrent(error, form);
public void commandAction(Command command, Displayable displayable) {
        // write pre-action user code here
        if (displayable == form) {
            if (command == exitCommand) {
                // write pre-action user code here
                 destroyApp(true);
                 exitMIDlet();
                // write post-action user code here
            } else if (command == okCommand) {
                // write pre-action user code here
                validateUser(textField.getString(), textField1.getString());
                // write post-action user code here
        }ERROR:
[WARN] [rms     ] javacall_file_open: wopen failed for: C:\Documents and Settings\mca071013\javame-sdk\3.0\work\0\appdb\delete_notify.dat
[WARN] [rms     ] javacall_file_open: _wopen failed for: C:\Documents and Settings\mca071013\javame-sdk\3.0\work\0\appdb\00000002images-6jpg.tmp
null
TRACE: <at java.lang.NullPointerException: 0>, Exception caught in Display class
java.lang.NullPointerException: 0
at hello.HelloMIDlet.showMsg(HelloMIDlet.java:233)
at hello.HelloMIDlet.validateUser(HelloMIDlet.java:223)
at hello.HelloMIDlet.commandAction(HelloMIDlet.java:126)
at javax.microedition.lcdui.Display$ChameleonTunnel.callScreenListener(), bci=46
at com.sun.midp.chameleon.layers.SoftButtonLayer.processCommand(), bci=74
at com.sun.midp.chameleon.layers.SoftButtonLayer.commandSelected(), bci=11
at com.sun.midp.chameleon.layers.MenuLayer.keyInput(), bci=290
at com.sun.midp.chameleon.CWindow.keyInput(), bci=38
at javax.microedition.lcdui.Display$DisplayEventConsumerImpl.handleKeyEvent(), bci=17
at com.sun.midp.lcdui.DisplayEventListener.process(), bci=277
at com.sun.midp.events.EventQueue.run(), bci=179
at java.lang.Thread.run(Thread.java:619)

Answer 1

Hi am new J2ME..
Here i have created a basic application of Login Screen in J2ME..i have added image in folder of my project..am using netbeans environment for this J2ME.,while am running my program it's not displaying image..
here,if login is successfull,it will display 1 image,or else it will display another image..
error displaying while am running this project.
CODING
public HelloMIDlet() {
try{
      img1 = Image.createImage("images.jpg");
    }catch(Exception e){
      System.out.println(e.getMessage());
public void validateUser(String name, String password) {
    if (name.equals("mani") && password.equals("mani")) {
      showMsg();
    } else {
      tryAgain();
public void showMsg() {
    Alert success = new Alert("Login Successfully","Your Login Process is completed!",img1, AlertType.INFO);
    success.setImage(img1);
    textField.setString("");
    textField1.setString("");
    display.setCurrent(success, form);
  public void tryAgain() {
    Alert error = new Alert("Login Incorrect", "Please try again", img1, AlertType.ERROR);
        error.setTimeout(900);
    error.setImage(img1);
    textField.setString("");
    textField1.setString("");
    display.setCurrent(error, form);
public void commandAction(Command command, Displayable displayable) {
        // write pre-action user code here
        if (displayable == form) {
            if (command == exitCommand) {
                // write pre-action user code here
                 destroyApp(true);
                 exitMIDlet();
                // write post-action user code here
            } else if (command == okCommand) {
                // write pre-action user code here
                validateUser(textField.getString(), textField1.getString());
                // write post-action user code here
        }ERROR:
[WARN] [rms     ] javacall_file_open: wopen failed for: C:\Documents and Settings\mca071013\javame-sdk\3.0\work\0\appdb\delete_notify.dat
[WARN] [rms     ] javacall_file_open: _wopen failed for: C:\Documents and Settings\mca071013\javame-sdk\3.0\work\0\appdb\00000002images-6jpg.tmp
null
TRACE: <at java.lang.NullPointerException: 0>, Exception caught in Display class
java.lang.NullPointerException: 0
at hello.HelloMIDlet.showMsg(HelloMIDlet.java:233)
at hello.HelloMIDlet.validateUser(HelloMIDlet.java:223)
at hello.HelloMIDlet.commandAction(HelloMIDlet.java:126)
at javax.microedition.lcdui.Display$ChameleonTunnel.callScreenListener(), bci=46
at com.sun.midp.chameleon.layers.SoftButtonLayer.processCommand(), bci=74
at com.sun.midp.chameleon.layers.SoftButtonLayer.commandSelected(), bci=11
at com.sun.midp.chameleon.layers.MenuLayer.keyInput(), bci=290
at com.sun.midp.chameleon.CWindow.keyInput(), bci=38
at javax.microedition.lcdui.Display$DisplayEventConsumerImpl.handleKeyEvent(), bci=17
at com.sun.midp.lcdui.DisplayEventListener.process(), bci=277
at com.sun.midp.events.EventQueue.run(), bci=179
at java.lang.Thread.run(Thread.java:619)