FULL PRODUCT VERSION :
java version "1.5.0_03"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_03-b07)
Java HotSpot(TM) Client VM (build 1.5.0_03-b07, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows 2000 [Version 5.00.2195]

A DESCRIPTION OF THE PROBLEM :
In the Ocean theme, JButtons display a rollover effect by showing an additional line border. But JToggleButtons do not, nor does the default button in a dialog. The user may think that the button is disabled because there is no rollover effect.

Please provide rollover feedback for all enabled buttons.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
See source code.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Expect rollover effects on all enabled buttons.
ACTUAL -
No rollover effects for toggle buttons and the default button.

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.awt.FlowLayout;

import javax.swing.JFrame;
import javax.swing.JButton;
import javax.swing.JToggleButton;

public class TestRollover {

    public static void main(String[] args) {
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.getContentPane().setLayout(new FlowLayout());
        f.getContentPane().add(new JButton("JButton - Rollover"));
        f.getContentPane().add(new JToggleButton("JToggleButton - No Rollover"));
        JButton defaultButton = new JButton("Default Button - No Rollover");
        f.getContentPane().add(defaultButton);
System.out.println( defaultButton.isRolloverEnabled() );
        f.getRootPane().setDefaultButton(defaultButton);
        f.pack();
        f.setLocationRelativeTo(null);
        f.setVisible(true);
    }
}

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

CUSTOMER SUBMITTED WORKAROUND :
Haven't tried it yet, but one could install custom borders which implement the rollover effect. Might have to copy code from MetalBorders.java, and a lot of classes (e.g., MetalUtils) aren't visible so it's far from straightforward.