public Builder clearRoutine() {
          routine_ = getDefaultInstance().getRoutine();
          bitField0_ = (bitField0_ & ~0x00000001);
          onChanged();
          return this;
        }
<pre>
Name of a routine within the workflow.
</pre>

<code>string routine = 1;</code>

@return This builder for chaining.
java-workflow-executions/proto-google-cloud-workflow-executions-v1/src/main/java/com/google/cloud/workflows/executions/v1/Execution.java