Trayicon mouseEntered is not working

I have the following problem: my mouse entered method doesn't work and I don`t know why. The mouse pressed works perfectly, only the mouseEntered not. this is the mouse listenener: ``` MouseListener mouseListener = new MouseListener() { public void mouseClicked(MouseEvent e) { jpopup.setLocation(e.getX(), e.getY()); jpopup.setInvoker(jpopup); jpopup.setVisible(true); System.out.println("Tray Icon - Mouse clicked!"); } @Override public void mouseEntered(MouseEvent e) { System.out.println("Tray Icon - Mouse entered!"); } public void mouseExited(MouseEvent e) { System.out.println("Tray Icon - Mouse exited!"); } public void mousePressed(MouseEvent e) { System.out.println("Tray Icon - Mouse pressed!"); } public void mouseReleased(MouseEvent e) { System.out.println("Tray Icon - Mouse released!"); } }; ``` and here the trayIcon: ``` trayIcon.setImageAutoSize(true); trayIcon.addActionListener(actionListener); trayIcon.addMouseListener(mouseListener); ``` Where is the error? I don't know... EDIT: i'm using eclipse, if that is interesting...