java version "1.4.1-rc"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.1-rc-b19)
Java HotSpot(TM) Client VM (build 1.4.1-rc-b19, mixed mode)

Calling toolkit.getLockingKeyState(KeyEvent.VK_SCROLL_LOCK) always returns whether the scroll lock key is currently held down, instead of current state of Scroll Lock.

Try running following sample program; every second it prints the scroll lock state.Try pressing Scroll lock; not that getLockingKeyState only returns true if you are holding scroll lock while it is called, if you press caps lock once (to enable it and release, then you get false back.

import java.awt.Toolkit;
import java.awt.event.KeyEvent;

public class ScrollProb {
  public static void main(String args[]) {
    for (;;) {
      try {
	Thread.sleep(1000);
      } catch(InterruptedException excep) {}
      System.out.println("Scroll lock on? " +
			 Toolkit.getDefaultToolkit().getLockingKeyState(
			   KeyEvent.VK_SCROLL_LOCK));
    }
  }
}