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    <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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    1. POWhen does a JPanel paint (or repaint) its child components?
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    1. COThanks for your answer! Part of the problem is that the JButton is a child of a JPanel. The JPanel background (a gradient) needs to shine through the areas on the JButton which is not painted by the JButton. Now, the JButton is perfectly "antialiased" against the JPanel at first. However, once i hoover the mouse over the JButton the edges becomes pixelized. Only when i "manually" ask the JPanel to repaint whenever the JButton is repainted does the antialiasing work as I like.
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    2. COI've updated the example. What result do you get?
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    3. COEven though your examples themselves did not solve my issue, your comment about why i use getClipBounds() did. I decided to try and get dimensions details from the component itself instead of from getClipBounds(). Somehow this proved to be the solution. I don't know why, but I am happy it did!
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