private static void emitSetStaticCallbacks(ClassEmitter ce) {
    CodeEmitter e = ce.begin_method(Constants.ACC_PUBLIC | Constants.ACC_STATIC,
                                    SET_STATIC_CALLBACKS,
                                    null);
    e.load_arg(0);
    e.putfield(STATIC_CALLBACKS_FIELD);
    e.return_value();
    e.end_method();
  }
private static void emitSetStaticCallbacks(ClassEmitter ce)