Agathed

//In this case I have the icon and no Null Pointer Exception
final JColorChooser locColorChooser = new JColorChooser();
locColorChooser.addChooserPanel(new EyeDropperColorChooserPanel());

//But if I create a new class inheriting from EyeDropperColorChooserPanel I got the null pointer exception

private class EyeDropper extends EyeDropperColorChooserPanel{
    public EyeDropper()
    {
      super();
    }
  }
final JColorChooser locColorChooser = new JColorChooser();
locColorChooser.addChooserPanel(new EyeDropper());