private void maybeForceBuilderInitialization() {
        if (com.google.protobuf.GeneratedMessage.alwaysUseFieldBuilders) {
          getExecutionStartingRequestFieldBuilder();
          getSpecExecutionStartingRequestFieldBuilder();
          getSpecExecutionEndingRequestFieldBuilder();
          getScenarioExecutionStartingRequestFieldBuilder();
          getScenarioExecutionEndingRequestFieldBuilder();
          getExecuteStepRequestFieldBuilder();
          getExecuteStepResponseFieldBuilder();
          getExecutionEndingRequestFieldBuilder();
          getStepValidateRequestFieldBuilder();
          getStepValidateResponseFieldBuilder();
          getExecutionStatusResponseFieldBuilder();
        }
      }