private com.google.protobuf.RepeatedFieldBuilderV3<
            com.google.cloud.vmwareengine.v1.DnsForwarding.ForwardingRule,
            com.google.cloud.vmwareengine.v1.DnsForwarding.ForwardingRule.Builder,
            com.google.cloud.vmwareengine.v1.DnsForwarding.ForwardingRuleOrBuilder>
        getForwardingRulesFieldBuilder() {
      if (forwardingRulesBuilder_ == null) {
        forwardingRulesBuilder_ =
            new com.google.protobuf.RepeatedFieldBuilderV3<
                com.google.cloud.vmwareengine.v1.DnsForwarding.ForwardingRule,
                com.google.cloud.vmwareengine.v1.DnsForwarding.ForwardingRule.Builder,
                com.google.cloud.vmwareengine.v1.DnsForwarding.ForwardingRuleOrBuilder>(
                forwardingRules_,
                ((bitField0_ & 0x00000008) != 0),
                getParentForChildren(),
                isClean());
        forwardingRules_ = null;
      }
      return forwardingRulesBuilder_;
    }
<pre>
Required. List of domain mappings to configure
</pre>

<code>
repeated .google.cloud.vmwareengine.v1.DnsForwarding.ForwardingRule forwarding_rules = 4 [(.google.api.field_behavior) = REQUIRED];
</code>
java-vmwareengine/proto-google-cloud-vmwareengine-v1/src/main/java/com/google/cloud/vmwareengine/v1/DnsForwarding.java