private com.google.protobuf.SingleFieldBuilder<
          main.Messages.SpecExecutionEndingRequest, main.Messages.SpecExecutionEndingRequest.Builder, main.Messages.SpecExecutionEndingRequestOrBuilder> 
          getSpecExecutionEndingRequestFieldBuilder() {
        if (specExecutionEndingRequestBuilder_ == null) {
          specExecutionEndingRequestBuilder_ = new com.google.protobuf.SingleFieldBuilder<
              main.Messages.SpecExecutionEndingRequest, main.Messages.SpecExecutionEndingRequest.Builder, main.Messages.SpecExecutionEndingRequestOrBuilder>(
                  specExecutionEndingRequest_,
                  getParentForChildren(),
                  isClean());
          specExecutionEndingRequest_ = null;
        }
        return specExecutionEndingRequestBuilder_;
      }