如何使JButton具有透明图标和非透明文本？

Question

I need to make a JButton with an image icon and regular text. This question is not duplicate of How to make JButton with transparent background and regular text? , as I need to upload an image as icon and make it transparent as well. I tried to use overriden paintComponent() method

    @Override
    public void paintComponent(java.awt.Graphics g) {
        java.awt.Graphics2D g2 = (java.awt.Graphics2D) g;
        g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, alpha));
        super.paintComponent(g2);
    }

But all it does is paints icon and text both transparent, also button does not refresh properly. Are there any possible workarounds?

UPDATE

The way I am setting the button is the following (item.getImage() returns array of bytes):

        setFocusable(true);
        setFocusPainted(true);
        setVerticalTextPosition(SwingConstants.CENTER);
        setHorizontalTextPosition(SwingConstants.CENTER);

        if(item.getImage() != null) {
            int w = BUTTON_SIZE - 10;
            int h = BUTTON_SIZE - 10;

            if(menuItem.isShowImageOnly()) {
                setIcon(menuItem.getScaledImage(w, h));
            }
            else {
                w = 80;
                h = 40;

                setIcon(menuItem.getScaledImage(w, h));
            }

Answer 1

Just draw the transparency on the Image first

    Image im = ...;
    java.awt.Graphics2D g2 = (java.awt.Graphics2D) im.getGraphics();
    g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, alpha));
    g2.drawImage(0,0, im, null);
    g2.dispose();
    ImageIcon icon = ...