How to add custom cursor

Question

Im trying to add a custom cursor to this game I'm trying to make here is the code

    JFrame window = new JFrame("First Java Window");
    window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    window.setResizable(false);
    

    GamePanel gamePanel = new GamePanel();
    
    window.add(gamePanel);
    
    Image cursor = Toolkit.getDefaultToolkit().getImage(getClass().getResource("cursor.png"));
    Point hotSpot = new Point(0,0);
    Cursor cursorInGame = Toolkit.getDefaultToolkit().createCustomCursor(cursor, hotSpot, "name");
    window.setCursor(cursorInGame);
   
    window.pack();
    window.setLocationRelativeTo(null);
    window.setVisible(true);
    gamePanel.startGameThread();

when i run the code it opens everything and the cursor is blank