java version "1.4.0"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0-b92)
Java HotSpot(TM) Client VM (build 1.4.0-b92, mixed mode)

Scroll bar doesn't generate any mouse events like mouse pressed ,mouse released,
and mouse clicked,whereas it generate mousemotionlistener events.

Even though mouselistener events are not generated ,thumb of the scrollbar
responds to mouse clicks.

Please run the following attached program .Try clicking on the scrollbar.
Scrollbar won't generate any mouselistener events.