MouseListener in JScrollPane doesn't react when scroll arrows focused

Question

If I press/release/enter a ScrollBar in any area except of the arrows, the listener reacts OK(the testing text is printed). Why does it happen? Aren't the arrows part of The JScrollBar component? What is the solution?
import javax.swing.JScrollBar;
import java.awt.event.MouseListener;
import java.awt.event.AdjustmentEvent;
import java.awt.event.MouseEvent;
public class TheScrollBar extends JScrollBar
public TheScrollBar()
addMouseListener(new java.awt.event.MouseAdapter()
public void mouseEntered(MouseEvent e)
System.out.println("Entered");               
public void mousePressed(MouseEvent e)
     System.out.println("Pressed");
public void mouseReleased(MouseEvent e)
     System.out.println("Released");
}

Answer 1

Hi
A quick piece of test code shows that the buttons are separate components.
import java.awt.*;
import javax.swing.*;
public class ScrollBarTest
    private static int total = 0;
    public static void main(String[] args) {
        explore(new JScrollBar());
        System.exit(0);
    public static void explore(Component c) {
        System.out.println("Component [" + total++ +"] is of type: " + c.getClass());
        // recurse
        if (c instanceof Container) {
            Container cont = (Container)c;
            int count = cont.getComponentCount();
            for (int i = 0; i < count; i++) {
                explore (cont.getComponent(i));
}Generates output like this:
Component [0] is of type: class javax.swing.JScrollBar
Component [1] is of type: class javax.swing.plaf.metal.MetalScrollButton
Component [2] is of type: class javax.swing.plaf.metal.MetalScrollButton
So, yes, they are separate components.
-- Patrick