How to put java application in Systemtray when user clicks on close windows

Question

i've seen from here how to use tray. So i use it in this way:

private void checkTray() throws IOException {
    if (SystemTray.isSupported()) {
        System.out.println("system tray supported");
        tray = SystemTray.getSystemTray();
        Image image = ImageIO.read(new FileInputStream(new File("logo.png")));
        ActionListener exitListener = new ActionListener() {

            public void actionPerformed(ActionEvent e) {
                System.out.println("Exiting....");
                System.exit(0);
            }
        };
        PopupMenu popup = new PopupMenu();
        MenuItem defaultItem = new MenuItem("Exit");
        defaultItem.addActionListener(exitListener);
        popup.add(defaultItem);
        defaultItem = new MenuItem("Open");
        defaultItem.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent e) {
                setVisible(true);
                setExtendedState(JFrame.NORMAL);
            }
        });
        popup.add(defaultItem);
        trayIcon = new TrayIcon(image, "SystemTray Demo", popup);
        trayIcon.setImageAutoSize(true);
    }
    addWindowStateListener(new WindowStateListener() {

        public void windowStateChanged(WindowEvent e) {
            if (e.getNewState() == ICONIFIED) {
                try {
                    tray.add(trayIcon);
                    setVisible(false);
                    System.out.println("added to SystemTray");
                } catch (AWTException ex) {
                    System.out.println("unable to add to tray");
                }
            }
            if(e.getNewState() == WindowEvent.WINDOW_CLOSING){
               try {
                    tray.add(trayIcon);
                    setVisible(false);
                    System.out.println("added to SystemTray");
                } catch (AWTException ex) {
                    System.out.println("unable to add to system tray");
                }
            }
            if (e.getNewState() == 7) {
                try {
                    tray.add(trayIcon);
                    setVisible(false);
                    System.out.println("added to SystemTray");
                } catch (AWTException ex) {
                    System.out.println("unable to add to system tray");
                }
            }
            if (e.getNewState() == MAXIMIZED_BOTH) {
                tray.remove(trayIcon);
                setVisible(true);
                System.out.println("Tray icon removed");
            }
            if (e.getNewState() == NORMAL) {
                tray.remove(trayIcon);
                setVisible(true);
                System.out.println("Tray icon removed");
            }
        }
    });
}

and in constructor :

this.setDefaultCloseOperation(JFrame.ICONIFIED);

When i click on close windows, my application doesn't go to the system try, but it closes itself. How can i solve it? can someone help me?

Answer 1

i solve adding this:

this.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent windowEvent) {
    setExtendedState(JFrame.ICONIFIED); 
    }
});