How to make Circle image Label in Java?

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I think you should change your tack, instead of trying to modify the output of a component, instead, modify the input…

enter image description here

So all this does, is apply a circular (alpha based) mask to another image

    BufferedImage master = ImageIO.read(new File("/Volumes/Disk02/Dropbox/MegaTokyo/thumnails/megatokyo_omnibus_1_3_cover_by_fredrin-d4oupef.jpg"));

    int diameter = Math.min(master.getWidth(), master.getHeight());
    BufferedImage mask = new BufferedImage(master.getWidth(), master.getHeight(), BufferedImage.TYPE_INT_ARGB);

    Graphics2D g2d = mask.createGraphics();
    applyQualityRenderingHints(g2d);
    g2d.fillOval(0, 0, diameter - 1, diameter - 1);
    g2d.dispose();

    BufferedImage masked = new BufferedImage(diameter, diameter, BufferedImage.TYPE_INT_ARGB);
    g2d = masked.createGraphics();
    applyQualityRenderingHints(g2d);
    int x = (diameter - master.getWidth()) / 2;
    int y = (diameter - master.getHeight()) / 2;
    g2d.drawImage(master, x, y, null);
    g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.DST_IN));
    g2d.drawImage(mask, 0, 0, null);
    g2d.dispose();

    JOptionPane.showMessageDialog(null, new JLabel(new ImageIcon(masked)));

The benefit of this is you can get soft clipping (which setClip doesn’t provide) as well as not messing with the existing clipping shape of a component

And applyQualityRenderingHints…

public static void applyQualityRenderingHints(Graphics2D g2d) {

    g2d.setRenderingHint(RenderingHints.KEY_ALPHA_INTERPOLATION, RenderingHints.VALUE_ALPHA_INTERPOLATION_QUALITY);
    g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
    g2d.setRenderingHint(RenderingHints.KEY_COLOR_RENDERING, RenderingHints.VALUE_COLOR_RENDER_QUALITY);
    g2d.setRenderingHint(RenderingHints.KEY_DITHERING, RenderingHints.VALUE_DITHER_ENABLE);
    g2d.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS, RenderingHints.VALUE_FRACTIONALMETRICS_ON);
    g2d.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
    g2d.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
    g2d.setRenderingHint(RenderingHints.KEY_STROKE_CONTROL, RenderingHints.VALUE_STROKE_PURE);

}

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