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