public Builder setExternalAccessRule(
        com.google.cloud.vmwareengine.v1.ExternalAccessRule value) {
      if (externalAccessRuleBuilder_ == null) {
        if (value == null) {
          throw new NullPointerException();
        }
        externalAccessRule_ = value;
      } else {
        externalAccessRuleBuilder_.setMessage(value);
      }
      bitField0_ |= 0x00000002;
      onChanged();
      return this;
    }
<pre>
Required. Description of the 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/UpdateExternalAccessRuleRequest.java