public Builder setExecution(com.google.cloud.workflows.executions.v1beta.Execution value) {
      if (executionBuilder_ == null) {
        if (value == null) {
          throw new NullPointerException();
        }
        execution_ = value;
      } else {
        executionBuilder_.setMessage(value);
      }
      bitField0_ |= 0x00000002;
      onChanged();
      return this;
    }
<pre>
Required. Execution to be created.
</pre>

<code>
.google.cloud.workflows.executions.v1beta.Execution execution = 2 [(.google.api.field_behavior) = REQUIRED];
</code>
java-workflow-executions/proto-google-cloud-workflow-executions-v1beta/src/main/java/com/google/cloud/workflows/executions/v1beta/CreateExecutionRequest.java