System.exit(o) in Swing

Question

Hi,
In my Swing application, as soon as I start the main() method, a dialog containing Username and Password fields with OK and Cancel buttons gets popped-up. I have a propertyChangeListener which gets notified when Ok or cancel is pressed and when Cancel is pressed, System.exit(0) is called to exit the JVM.
So, there are two threads running -
One - the main thread which invokes the dialog pop-up
Second - the propertychangelistener which calls the System.exit(0) on pressing Cancel button.
So, at times, after pressing cancel button, the application does not exit but invokes the previously running thread (main thread). But this does not happen always.
Could you please let me know why the application does not terminate completely and how to resolve this?
Thanks in advance!

Answer 1

Hi,
As I had already mentioned in my previous post -
Here is the pseudo-code which fails to terminate on pressing Cancel button at times.
================The Login dialog code=============
public LoginDialog()
// Other code
JOptionPane optionPane = new JOptionPane(array, JOptionPane.QUESTION_MESSAGE, JOptionPane.YES_NO_OPTION, null, options, options[0]);
optionPane.addPropertyChangeListener(new PropertyChangeListener()
public void propertyChange(PropertyChangeEvent e)
          Object value = optionPane.getValue();
          if (value.equals(YES))
          else
// user closed dialog or clicked cancel
setVisible(false);
System.exit(0);
===============The main thread===================
This main() method calls the logindialog with username and passwrd as parameters.
So, initially, the main() thread is started and the login dialog is displayed. On pressing Cancel in this dialog, the control goes to propertyChangeListener of the loginDialog() and calls System.exit(0) which should terminate the entire application, but at times, the previously running main thread is resumed and the application is not terminated.
Please clarify why this happens.
Thanks in advance!!
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