public Builder clear() {
        super.clear();
        if (responseBuilder_ == null) {
          response_ = JOutPiqi.callback_response.getDefaultInstance();
        } else {
          responseBuilder_.clear();
        }
        bitField0_ = (bitField0_ & ~0x00000001);
        if (systemBuilder_ == null) {
          system_ = JSystemPiqi.system_request.getDefaultInstance();
        } else {
          systemBuilder_.clear();
        }
        bitField0_ = (bitField0_ & ~0x00000002);
        return this;
      }