In the Windows LAF on WinXP the system sliders has rollover effect while Swing JSlider misses it.

Start following application:

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

public class SliderTest {
    public static void main(String[] args) {
        try {
            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        } catch(Exception ex) {
            ex.printStackTrace();
            System.exit(-1);
        }

        JFrame frame = new JFrame("Slider test");
        frame.setLayout(new BorderLayout());
        frame.add(new JSlider(), BorderLayout.CENTER);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setVisible(true);
    }
}

And see that when mouse over the JSlider it does not highlight its marker like native sliders do.
###@###.### 11/4/04 16:56 GMT