Program: 124439
Project: 124439
Buggy source:
public void handleEvent(Event event){
  String type=event.getType();
  if (type.equals(CLICK))   visualComponent.getListener(ClickListener.class).clickPerformed(visualComponent);
 else   if (type.equals(DBLCLICK))   visualComponent.getListener(DoubleClickListener.class).doubleClickPerformed(visualComponent);
 else   if (type.equals(MOUSEOVER))   visualComponent.getListener(MouseOverListener.class).mouseOverPerformed(visualComponent);
 else   if (type.equals(MOUSEOUT))   visualComponent.getListener(MouseOutListener.class).mouseOutPerformed(visualComponent);
 else   if (type.equals(MOUSEDOWN))   visualComponent.getListener(MouseDownListener.class).mouseDownPerformed(null);
 else   if (type.equals(MOUSEUP))   visualComponent.getListener(MouseUpListener.class).mouseUpPerformed(visualComponent);
 else   if (type.equals(BLUR))   visualComponent.getListener(BlurListener.class).blurPerformed(visualComponent);
 else   if (type.equals(INPUT))   visualComponent.getListener(InputListener.class).inputPerformed(visualComponent);
 else   if (event instanceof KeyboardEvent) {
    KeyboardEvent keyboardEvent=(KeyboardEvent)event;
    int keyId=Integer.parseInt(keyboardEvent.getKeyIdentifier());
    if (type.equals(KEYUP))     visualComponent.getListener(KeyUpListener.class).keyupPerformed(visualComponent,keyId);
 else     if (type.equals(KEYDOWN))     visualComponent.getListener(KeyDownListener.class).keydownPerformed(visualComponent,keyId);
 else     if (type.equals(KEYPRESS))     visualComponent.getListener(KeyPressListener.class).keypressPerformed(visualComponent,keyId);
  }
}

Fixed version (ground truth):
public void handleEvent(Event event){
  String type=event.getType();
  if (type.equals(CLICK))   visualComponent.getListener(ClickListener.class).clickPerformed(visualComponent);
 else   if (type.equals(DBLCLICK))   visualComponent.getListener(DoubleClickListener.class).doubleClickPerformed(visualComponent);
 else   if (type.equals(MOUSEOVER))   visualComponent.getListener(MouseOverListener.class).mouseOverPerformed(visualComponent);
 else   if (type.equals(MOUSEOUT))   visualComponent.getListener(MouseOutListener.class).mouseOutPerformed(visualComponent);
 else   if (type.equals(MOUSEDOWN))   visualComponent.getListener(MouseDownListener.class).mouseDownPerformed(null);
 else   if (type.equals(MOUSEUP))   visualComponent.getListener(MouseUpListener.class).mouseUpPerformed(visualComponent);
 else   if (type.equals(BLUR))   visualComponent.getListener(BlurListener.class).blurPerformed(visualComponent);
 else   if (type.equals(INPUT))   visualComponent.getListener(InputListener.class).inputPerformed(visualComponent);
 else   if (event instanceof KeyboardEvent) {
    KeyboardEvent keyboardEvent=(KeyboardEvent)event;
    int keyId=keyboardEvent.getKeyCode();
    if (type.equals(KEYUP))     visualComponent.getListener(KeyUpListener.class).keyupPerformed(visualComponent,keyId);
 else     if (type.equals(KEYDOWN))     visualComponent.getListener(KeyDownListener.class).keydownPerformed(visualComponent,keyId);
 else     if (type.equals(KEYPRESS))     visualComponent.getListener(KeyPressListener.class).keypressPerformed(visualComponent,keyId);
  }
}