@java.lang.Override
      public Builder clear() {
        super.clear();
        bitField0_ = 0;
        sessionId_ = null;
        if (sessionIdBuilder_ != null) {
          sessionIdBuilder_.dispose();
          sessionIdBuilder_ = null;
        }
        messageType_ = 1;
        request_ = null;
        if (requestBuilder_ != null) {
          requestBuilder_.dispose();
          requestBuilder_ = null;
        }
        response_ = null;
        if (responseBuilder_ != null) {
          responseBuilder_.dispose();
          responseBuilder_ = null;
        }
        failure_ = null;
        if (failureBuilder_ != null) {
          failureBuilder_.dispose();
          failureBuilder_ = null;
        }
        return this;
      }
@java.lang.Override
      public Builder clear()