When any Java toplevel window is being shown, it is checked, if it should be blocked by any visible modal dialogs. But even if it should, when it gets focus when shown. This can be illustrated by the following simple example:

import java.awt.*;

pubic class CauseDialogToLostFocus
{
  public static void main(String[] args)
  {
    // parent frame
    Frame f = new Frame("F");
    f.setBounds(0, 0, 200, 100);
    f.setVisible(true);

    // toolkit-modal dialog d1
    final Dialog d1 = new Dialog(f, "D1", Dialog.ModalityType.TOOLKIT_MODAL);
    d1.setBounds(100, 100, 200, 100);
    // show d1 in a separate thread to leave this thread running
    new Thread(new Runnable()
      {
        public void run()
        {
          d1.setVisible(true);
        }
      });

    // application-modal dialog d2
    Dialog d2 = new Dialog(f, "D2", Dialog.ModalityType.APPLICATION_MODAL);
    d2.setBounds(200, 200, 200, 100);
    // d2 must be blocked by d1
    d2.setVisible(true);
  }
}

Run this test on linux/solaris w/ XToolkit. If the second dialog has focus (different WMs can mark this by highlighting the title or somehow else), the bug is reproduced.

###@###.### 2005-05-31 13:36:44 GMT