FULL PRODUCT VERSION :
java version "1.5.0_10"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_10-b03)
Java HotSpot(TM) Client VM (build 1.5.0_10-b03, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
5.1.2600

A DESCRIPTION OF THE PROBLEM :
Problem first noticed on 1.5.0_10; it may be older, but was not always there.



STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run the sample under Windows (two icons named on.png and off.png must be supplied).

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
There should be a toolbar consisting of a text field and two icons.

On the console, comments should report the size of the icons and of the buttons.
ACTUAL -
The text field runs all the way to the margin, and, although the console report gives the correct size for the icons, the buttons have negative sizes.

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
// Two simple icons named on.png and off.png are necessary
// The program uses native look and feel, so will fail only when run under Windows

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Toolkit;

import javax.swing.ButtonGroup;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JRadioButton;
import javax.swing.JTextField;
import javax.swing.JToolBar;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

@SuppressWarnings("serial")
public final class RadioButtonBug extends JFrame {

	final private JToolBar toolbar;
	final private JTextField zero;
	final private Icon on, off;
	final private JRadioButton button1, button2, button3;

	private RadioButtonBug() {
            
        //init JFrame
		setTitle("RadioButtonBug");
		toolbar = new JToolBar();
		toolbar.setFloatable(false);
		add(toolbar, BorderLayout.NORTH);		
                
        zero = new JTextField(30);
		toolbar.add(zero);
		off = new ImageIcon(this.getClass().getResource("off.png"));
		on = new ImageIcon(this.getClass().getResource("on.png"));
                
		button1 = new JRadioButton(off);
		button1.setSelectedIcon(on);
		toolbar.add(button1);
		
        button2 = new JRadioButton(off, true);
		button2.setSelectedIcon(on);
		toolbar.add(button2);
                
        pack();
	}

	private void report() {
		System.err.println("Icon 'on' is " + on.getIconWidth() + " by "
				+ on.getIconHeight() + ',');
		System.err.println("But button 'leftButton' is " + button1.getWidth()
				+ " by " + button1.getHeight() + '.');
		System.err.println("Icon 'off' is " + off.getIconWidth() + " by "
				+ off.getIconHeight() + ',');
		System.err.println("But button 'rightButton' is " + button2.getWidth()
				+ " by " + button2.getHeight() + '.');
	}

	public static void main(String[] args) throws ClassNotFoundException,
			IllegalAccessException, InstantiationException,
			UnsupportedLookAndFeelException {
		UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
		JFrame.setDefaultLookAndFeelDecorated(true);
		RadioButtonBug frame = new RadioButtonBug();
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setVisible(true);
		frame.report();
	}

}

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Use JComponent.setBorder(); In the previous code, use: leftButton.setBorder(javax.swing.BorderFactory.createEmptyBorder(0, 0, 0, 0));