Help - Focuslost is trigered too many time during jtextfield validation.

Question

Hi all,
I am designing a form containing multiple fields with field validations.
The program supposes bring the focus back to that particular field after the error message is displayed. However; the
error/warning message is displayed infinitely between the two focusLost events of the two Jtextfields when the focus is switched between the two jtextfields. I tried to google it, but there was no success.
Can anyone tell me why?
Thanks a lot.
core code
    private void jTextField1FocusLost(java.awt.event.FocusEvent evt) {                                     
        // TODO add your handling code here:evt.getSource();
        JTextField roomTag=(JTextField) evt.getSource();
         String text = roomTag.getText();
         if (text.length() >= 3) {
            try {
                    Integer.parseInt(text);
            } catch(NumberFormatException nfe) {
             //    Toolkit.getDefaultToolkit().beep();
//SwingUtilities.invokeLater(new FocusGrabber(this.jTextField1));
               JOptionPane.showMessageDialog(null, "It must be a numeric value");
               //roomTag.requestFocus();
               jTextField1.requestFocus();
               //return;
         } else {
               JOptionPane.showMessageDialog(null, "It must be 3 chars at least");
               //roomTag.requestFocus();
                jTextField1.requestFocus();
                //return;
    private void txtPhoneFocusLost(java.awt.event.FocusEvent evt) {                                  
        // TODO add your handling code here:
        JTextField roomTag=(JTextField) evt.getSource();
         String text = roomTag.getText();
         if (text.length() <= 12) {
            try {
                Long a=Long.parseLong(text);
            } catch(NumberFormatException nfe) {
               JOptionPane.showMessageDialog(null, "The phone number must be a numeric value");
               txtPhone.requestFocus();
               //roomTag.requestFocus();
               //jTextField1.requestFocus();
               //return;
         } else {
               JOptionPane.showMessageDialog(null, "The phone number must be 12 chars at most");
                txtPhone.requestFocus();
               //roomTag.requestFocus();
                //jTextField1.requestFocus();
                //return;
                                     Edited by: ehope on Nov 1, 2009 5:14 PM
Edited by: ehope on Nov 1, 2009 5:18 PM
Edited by: ehope on Nov 1, 2009 5:21 PM

Answer 1

A search of the forum on two terms -- focusLost multiple -- came up with some interesting hits: [forum search|http://search.sun.com/main/index.jsp?all=focuslost+multiple&exact=&oneof=&without=&nh=10&rf=0&since=&dedupe=true&doctype=&reslang=en&type=advanced&optstat=true&col=main-all]
including a bug report and a work-around by camickr.
Another possible work around is to remove the focuslistener, then re-add it at the end of the focuslistener but via a Swing Timer to delay its re-addition.