JSliderのFocusBorderを非表示に設定する

JSlider slider2 = new JSlider(0, 100, 0) {
  private transient FocusListener listener;

  @Override public void updateUI() {
    removeFocusListener(listener);
    super.updateUI();
    if (getUI() instanceof WindowsSliderUI) {
      setUI(new WindowsSliderUI(this) {
        @Override public void paintFocus(Graphics g) {
          /* empty paint */
        }
      });
      Color bgc = getBackground();
      listener = new FocusListener() {
        @Override public void focusGained(FocusEvent e) {
          setBackground(bgc.brighter());
        }

        @Override public void focusLost(FocusEvent e) {
          setBackground(bgc);
        }
      };
      addFocusListener(listener);
    }
  }
};