public Builder setRequestId(java.lang.String value) {
      if (value == null) {
        throw new NullPointerException();
      }
      requestId_ = value;
      bitField0_ |= 0x00000008;
      onChanged();
      return this;
    }
<pre>
Optional. The request ID must be a valid UUID with the exception that zero
UUID is not supported (00000000-0000-0000-0000-000000000000).
</pre>

<code>string request_id = 4 [(.google.api.field_behavior) = OPTIONAL];</code>

@param value The requestId to set.
@return This builder for chaining.
java-vmwareengine/proto-google-cloud-vmwareengine-v1/src/main/java/com/google/cloud/vmwareengine/v1/CreateClusterRequest.java