Running "jdk1.3.0rc1-T" on Windows NT ServicePack6a an abstract button generates
a change event when the mouse passes over a JButton. This behaviour is not
exhibited on "1.3beta-0" on Solaris Sparc.

The following test code illustrates the problem :

// java import
import java.awt.*;
import javax.swing.*;
import javax.swing.event.*;

//

public class Test extends JFrame implements ChangeListener {
private JButton b1, b2;

    public Test () {
        super("Test");
getContentPane().setLayout(new FlowLayout());
getContentPane().add(b1 = new JButton("b1"));
b1.addChangeListener(this);
getContentPane().add(b2 = new JButton("b2"));
b2.addChangeListener(this);
pack();
setVisible(true);
    }
public void stateChanged(ChangeEvent e) {
System.out.println("Should not get this event unless a button is clicked --->");
}

public static final void main(String args[]) {
Test t = new Test();
}
}