private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.vmwareengine.v1.ExternalAccessRule,
            com.google.cloud.vmwareengine.v1.ExternalAccessRule.Builder,
            com.google.cloud.vmwareengine.v1.ExternalAccessRuleOrBuilder>
        getExternalAccessRuleFieldBuilder() {
      if (externalAccessRuleBuilder_ == null) {
        externalAccessRuleBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.vmwareengine.v1.ExternalAccessRule,
                com.google.cloud.vmwareengine.v1.ExternalAccessRule.Builder,
                com.google.cloud.vmwareengine.v1.ExternalAccessRuleOrBuilder>(
                getExternalAccessRule(), getParentForChildren(), isClean());
        externalAccessRule_ = null;
      }
      return externalAccessRuleBuilder_;
    }
<pre>
Required. The initial description of a new external access rule.
</pre>

<code>
.google.cloud.vmwareengine.v1.ExternalAccessRule external_access_rule = 2 [(.google.api.field_behavior) = REQUIRED];
</code>
java-vmwareengine/proto-google-cloud-vmwareengine-v1/src/main/java/com/google/cloud/vmwareengine/v1/CreateExternalAccessRuleRequest.java