Java JSpinner painting twice

Question

Quick picture to show what is happening

The JSpinner is appearing twice as seen in the picture above. The first appearance at point (0,0) that should not be there is not selectable, editable or useable with no spinner buttons.

The odd thing here is that every other component has no problem. Only the jspinner. I am using Java 7 and developing in Netbeans (not gui developer kit). Is this a bug with java 7? If not what can I try to make my JSpinner paint only 1 time in the area i specified?

Code to illustrate the problem:

I am adding it to a subclass of JPanel as seen here:

public class MyCustomGUI extends JPanel {
private JSpinner entrySpinner;
public MyCustomGUI () {
 super(null);
 this.setDoubleBuffered(true);

 entrySpinner = new JSpinner(new SpinnerNumberModel(0, 0, Integer.MAX_VALUE, 1));
 add(entrySpinner);
....

I have a method to give it a location:

public void resize() {
     entrySpinner.setBounds((int) (this.getWidth() * .2), (int) (this.getHeight() * 0.38), (int) (this.getWidth() * 0.3), (int) (this.getHeight() * 0.1));
}

And I override the paint method here:

public void paint(Graphics g) {
    super.paint(g);
    Graphics2D g2d = (Graphics2D) g;
    g2d.setRenderingHint(
            RenderingHints.KEY_TEXT_ANTIALIASING,
            RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
    .. draw shapes..
    super.paintComponents(g);
    super.validate();
    Toolkit.getDefaultToolkit.sync();
    g.dispose();
}

Answer 1

1. You're calling paintComponent twice, once when you call super.paint and once manually
2. You're calling validate from within a paint method which is only going to result in the component begin repainted, over and over and over again...say good bye to your CPU...
3. You're disposing of the graphics context you did not create, this is like closing a file your did not open. If you didn't create it, you shouldn't close it.
4. I'm not convinced that you have a need to call Toolkit.getDefaultToolkit.sync();, but I'm reasonably confident that you shouldn't be doing it from within the paint method
5. Unless you have a very good reason to do it otherwise, you should not be overriding the paint method. The recommended method to perform custom painting in is the paintComponent method (which is called by paint)

You might like to have a read through

• Performing Custom Painting
• Painting in AWT and Swing

Update with example

Fixed it for me...

Left is your code, right is mine

public class TestPaintSpinner {

    public static void main(String[] args) {
        new TestPaintSpinner();
    }

    public TestPaintSpinner() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                }

                JFrame frame = new JFrame();
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new BorderLayout());
                frame.add(new TestPane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public class TestPane extends JPanel {

        public TestPane() {
            setDoubleBuffered(true);
            setLayout(new GridBagLayout());
            add(new JSpinner(new SpinnerNumberModel(0, 0, Integer.MAX_VALUE, 1)));

            JPanel panel = new JPanel();
            panel.add(new JLabel("Subpanel"));
            add(panel);
        }

//        public void paint(Graphics g) {
//            super.paint(g);
//
//            Graphics2D g2d = (Graphics2D) g;
//            Point2D sPoint = new Point2D.Float(0, 0);
//            Point2D ePoint = new Point2D.Float(this.getWidth(), this.getHeight());
//
//            g2d.setRenderingHint(
//                    RenderingHints.KEY_TEXT_ANTIALIASING,
//                    RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
//            super.paintComponents(g);
//            super.validate();
//            Toolkit.getDefaultToolkit().sync();
//            g.dispose();
//        }

        @Override
        protected void paintComponent(Graphics g) {
            super.paintComponent(g); //To change body of generated methods, choose Tools | Templates.

            Graphics2D g2d = (Graphics2D) g;
            Point2D sPoint = new Point2D.Float(0, 0);
            Point2D ePoint = new Point2D.Float(this.getWidth(), this.getHeight());

            // Note, this will effect every component painted after this one!!
            g2d.setRenderingHint(
                    RenderingHints.KEY_TEXT_ANTIALIASING,
                    RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
        }
    }
}