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copied!<p>I've reduced the example to just the anti-aliasing, and I am unable to reproduce the problem. It doesn't appear to be platform dependent. I'm not sure why you are using <code>getClipBounds()</code>.</p> <p>Addendum:</p> <blockquote> <p>The <code>JPanel</code> background (a gradient) needs to shine through…</p> </blockquote> <p>I've update the example to use a gradient background behind a transparent button; I've put anti-aliased (left) and aliased (right) examples side-by-side. I see no unexpected behavior. </p> <p><img src="https://i.stack.imgur.com/QtvZd.png" alt="ButtonUITest.png"></p> <pre><code>import java.awt.Color; import java.awt.Dimension; import java.awt.EventQueue; import java.awt.GradientPaint; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.GridLayout; import java.awt.RenderingHints; import javax.swing.JButton; import javax.swing.JComponent; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.plaf.basic.BasicButtonUI; /** @see http://stackoverflow.com/questions/5169647 */ public class ButtonUITest extends JPanel { public ButtonUITest() { this.setLayout(new GridLayout(1, 0)); this.setPreferredSize(new Dimension(640, 480)); this.add(new CustomButton(true)); this.add(new CustomButton(false)); } @Override protected void paintComponent(Graphics g) { super.paintComponent(g); int w = this.getWidth(); int h = this.getHeight(); Graphics2D g2d = (Graphics2D) g; g2d.setPaint(new GradientPaint(0, 0, Color.blue, w, h, Color.red)); g2d.fillRect(0, 0, w, h); } private void display() { JFrame f = new JFrame("ButtonUITest"); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.add(this); f.pack(); f.setLocationRelativeTo(null); f.setVisible(true); } private static class CustomButton extends JButton { public CustomButton(boolean antialiased) { this.setOpaque(false); this.setUI(new CustomButtonUI(antialiased)); } } private static class CustomButtonUI extends BasicButtonUI { private boolean antialiased; public CustomButtonUI(boolean antialiased) { this.antialiased = antialiased; } @Override public void paint(Graphics g, JComponent c) { int w = c.getWidth(); int h = c.getHeight(); Graphics2D g2d = (Graphics2D) g; if (antialiased) { g2d.setRenderingHint( RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); } g2d.setColor(Color.LIGHT_GRAY); g2d.fillOval(0, 0, w, 2 * h); } } public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { @Override public void run() { new ButtonUITest().display(); } }); } } </code></pre>

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