Memory leak(?)

Hello people,

I'm quite a newbie with Java, so please bear with me (and tips are very much appreciated).

I've started working on a program that is solely run from the system tray and it seems to work to a certain extent.
Now I'm not entirely sure, but I think the program has a memory leak, because mousing over the system tray icon results in increased memory usage (in task manager).

Here's my code:

Code:

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public class PopNotifyInstance implements ActionListener {

    private MenuItem manageItem;
    private MenuItem exitItem;

    public void InitPopNotify() {

        final TrayIcon trayIcon;

        if (SystemTray.isSupported()) {

            SystemTray tray = SystemTray.getSystemTray();
            Image image = Toolkit.getDefaultToolkit().getImage("src/popnotify/img/tray_icon.png");
                       
            PopupMenu popup = new PopupMenu();
            manageItem = new MenuItem("Manage notifications");
            popup.add(manageItem);
            manageItem.addActionListener(this);
            popup.addSeparator();
            exitItem = new MenuItem("Quit");
            popup.add(exitItem);
            exitItem.addActionListener(this);

            trayIcon = new TrayIcon(image, "PopNotify", popup);

            try {
                tray.add(trayIcon);
            } catch (AWTException e) {
                System.err.println("TrayIcon could not be added.");
            }

        } else {

            // System tray disabled
            System.err.println("System tray disabled.");

        }
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() instanceof MenuItem) {
            MenuItem j = (MenuItem) e.getSource();
            System.out.println(j.getLabel() + " button was pressed.");
            if (j.getLabel().equals("Quit")) {
                System.exit(0);
            } else if (j.getLabel().equals("Manage notifications")) {
                //TODO add functionality
            }
        }     
    }

    public static void main(String[] args) {
        PopNotifyInstance popnotify = new PopNotifyInstance();
        popnotify.InitPopNotify();
    }
}

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So my question is; what causes my application to use more memory when I mouseover the system tray icon?

Thanks in advance,
LENJ