public Builder setHandleUserJoin(JInPiqi.handle_user_join value) {
        if (handleUserJoinBuilder_ == null) {
          if (value == null) {
            throw new NullPointerException();
          }
          handleUserJoin_ = value;
          onChanged();
        } else {
          handleUserJoinBuilder_.setMessage(value);
        }
        bitField0_ |= 0x00000002;
        return this;
      }