private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.vpcaccess.v1.Connector,
            com.google.cloud.vpcaccess.v1.Connector.Builder,
            com.google.cloud.vpcaccess.v1.ConnectorOrBuilder>
        getConnectorFieldBuilder() {
      if (connectorBuilder_ == null) {
        connectorBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.vpcaccess.v1.Connector,
                com.google.cloud.vpcaccess.v1.Connector.Builder,
                com.google.cloud.vpcaccess.v1.ConnectorOrBuilder>(
                getConnector(), getParentForChildren(), isClean());
        connector_ = null;
      }
      return connectorBuilder_;
    }
<pre>
Required. Resource to create.
</pre>

<code>
.google.cloud.vpcaccess.v1.Connector connector = 3 [(.google.api.field_behavior) = REQUIRED];
</code>
java-vpcaccess/proto-google-cloud-vpcaccess-v1/src/main/java/com/google/cloud/vpcaccess/v1/CreateConnectorRequest.java