#vulnerable code 
                              @Deprecated
  public static boolean addHotkey(String key, int modifiers, HotkeyListener listener) {
    return HotkeyManager.getInstance().addHotkey(key, modifiers, listener);
  } 
                            #location 3 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                              @Deprecated
  public static boolean addHotkey(String key, int modifiers, HotkeyListener listener) {
    return Key.addHotkey(key, modifiers, listener);
  }