private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.workflows.v1.Workflow,
            com.google.cloud.workflows.v1.Workflow.Builder,
            com.google.cloud.workflows.v1.WorkflowOrBuilder>
        getWorkflowFieldBuilder() {
      if (workflowBuilder_ == null) {
        workflowBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.workflows.v1.Workflow,
                com.google.cloud.workflows.v1.Workflow.Builder,
                com.google.cloud.workflows.v1.WorkflowOrBuilder>(
                getWorkflow(), getParentForChildren(), isClean());
        workflow_ = null;
      }
      return workflowBuilder_;
    }
<pre>
Required. Workflow to be created.
</pre>

<code>
.google.cloud.workflows.v1.Workflow workflow = 2 [(.google.api.field_behavior) = REQUIRED];
</code>
java-workflows/proto-google-cloud-workflows-v1/src/main/java/com/google/cloud/workflows/v1/CreateWorkflowRequest.java