Why windowClosing is called two times?

Hi,
I'm saving my project in JFrame windowClosing event. But it is called two times...
How to prevent it?
this.addWindowListener(new java.awt.event.WindowAdapter() {
public void windowClosing(java.awt.event.WindowEvent e) {
saveCurrentProject();
Thanks,
Andr�

Thanks, problem solved.
this.addWindowListener(new java.awt.event.WindowAdapter() {
public void windowClosing(java.awt.event.WindowEvent e) {
saveCurrentProject();
System.exit(0); // <-- new line
Andre

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