When i use KeyboardFocusManager them program don�t work very well

Question

i use
this.addKeyListener(new java.awt.event.KeyAdapter()
public void keyPressed(KeyEvent e)
this_keyPressed(e);
when i change for KeyboardFocusManager the program don�t work very well
KeyboardFocusManager.getCurrentKeyboardFocusManager().addKeyEventDispatcher(
     new KeyEventDispatcher() {
     public boolean dispatchKeyEvent(KeyEvent e) {
          this_keyPressed(e);
     // If the key should not be dispatched to the
     // focused component, set discardEvent to true
     boolean discardEvent = false;
     return discardEvent;
     });

Answer 1

when i change jre 1.3 to 1.5 the listener don�t work
addKeyListener(new java.awt.event.KeyAdapter()
public void keyPressed(KeyEvent e)
     if (e.getKeyCode() == KeyEvent.VK_F12)
this_keyPressed(e);
I use KeyboardFocusManager but the executation dont�n work very well
why?
KeyboardFocusManager.getCurrentKeyboardFocusManager().addKeyEventDispatcher(
     new KeyEventDispatcher() {
     public boolean dispatchKeyEvent(KeyEvent e) {
          this_keyPressed(e);
     // If the key should not be dispatched to the
     // focused component, set discardEvent to true
     boolean discardEvent = false;
     return discardEvent;
     });