Does JOptionPane have a bug in jdk1.4?

Question

Sorry to post this again, but last time had posted it under a different title/topic. The following piece of code works fine with jdk1.3, but HANGS with jdk1.4-import java.awt.event.*;
import javax.swing.*;
public class TestDriver extends JPanel {
   JTextField textField1, textField2;
   MyInputVerifier inputVerifier;
   public TestDriver() {
      initPanel();
   private void initPanel() {
      textField1 = new JTextField(10);
      textField1.setName("Test");
      textField2 = new JTextField(10);
      this.add(textField1);
      this.add(textField2);
      inputVerifier = new MyInputVerifier();
      textField1.setInputVerifier(inputVerifier);
   public static void main(String[] args) {
      JFrame frame = new JFrame();
      frame.getContentPane().add(new TestDriver());
      frame.setSize(200, 100);
      frame.setVisible(true);
      frame.addWindowListener(new WindowAdapter() {
         public void windowClosing(WindowEvent e) {
            System.exit(0);
   class MyInputVerifier extends InputVerifier {
      public boolean verify(JComponent comp) {
         //only when the user enters "Test" in the first text field, should the focus be
         //transferred to the next text field
         if(comp.getName().equals("Test")) {
            String text = ((JTextField)comp).getText();
            if(("Test").equals(text)) {
               return true;
            } else {
               showError();
               return false;
         return true;
   private void showError() {
      //this works fine with both jdk1.3 and jdk1.4
      System.out.println("Wrong!\n Enter \"Test\"");
      //this is where the program hangs when run with jdk1.4
      JOptionPane.showMessageDialog(this, "Wrong!\n Enter \"Test\"");
}Can anyone please confirm that it really doesn't work with jdk1.4? Also please let me know if anything is wrong with the program.
I searched in the bug database and found that a few bugs on similar topics have already been reported. But I didn't find one (which is open) particularly on this topic. Is anyone aware of a bug on this topic already reported? If so, could you please post the appropriate link here.
Thanks a lot.

Answer 1

Thanks for the reply. The problem is not related to JOptionPane. It's related to verify method of InputVerifier. First of all, as per the jdk1.4 Javadocs, the verify method is not allowed to have side effects. So calling JOptionPane.showMessageDialog() from within verify is not a correct implementation. But the javadocs say that shouldYieldFocus of InputVerifier is allowed to have side effects. So basically the shouldYieldFocus method needs to be implemented and it should pou up a dialog when the input is incorrect.
BUT, it doesn't work either. It has a bug (4532517). Here is the link to the related bug report-http://developer.java.sun.com/developer/bugParade/bugs/4532517.html
A workaround has been given there and after using that, the program works fine.
I have no idea, why it works fine with 1.3. As you said, due to changes in the Focus mechanism in jdk1.4, this problem has arisen.
Thanks.