Java rounded Swing JButton

button.setBorderPainted(false);
button.setContentAreaFilled(false);
button.setOpaque(true);

button.setOpaque(false);
button.setFocusPainted(false);
button.setBorderPainted(false);
button.setContentAreaFilled(false);
setBorder(BorderFactory.createEmptyBorder(0,0,0,0)); // Especially important

JButton addBtn=new JButton("+");
    addBtn.setBounds(x_pos,y_pos,30,25);
    addBtn.setBorder(new RoundedBorder(10));//10 is the radius
    addBtn.setForeground(Color.BLUE);

private static class RoundedBorder implements Border {

        private int radius;

        RoundedBorder(int radius) {
            this.radius = radius;
        }
        public Insets getBorderInsets(Component c) {
            return new Insets(this.radius+1, this.radius+1, this.radius+2, this.radius);
        }


        public boolean isBorderOpaque() {
            return true;
        }


        public void paintBorder(Component c, Graphics g, int x, int y, int width, int height) {
            g.drawRoundRect(x,y,width-1,height-1,radius,radius);
        }
    }

button.setOpaque(false);

class JImageButton extends JComponent implements MouseListener {
    private BufferedImage img = null;

    public JImageButton(BufferedImage img) {
        this.img = img;
        setMinimumSize(new Dimension(img.getWidth(), img.getHeight()));
        setOpaque(false);
        addMouseListener(this);
    }

    public void paintComponent(Graphics g) {
        g.drawImage(img, 0, 0, img.getWidth(), img.getHeight(), null);
    }

    @Override
    public void mouseClicked(MouseEvent e) {
    }

    @Override
    public void mouseEntered(MouseEvent e) {
    }

    @Override
    public void mouseExited(MouseEvent e) {
    }

    @Override
    public void mousePressed(MouseEvent e) {
    }

    @Override
    public void mouseReleased(MouseEvent e) {
    }
}