*/
private static void handleClassWithUniqueFields(
Class<?> clazz) {
if (uniqueFieldHandler == null) {
uniqueFieldHandler = new UniqueFieldHandler();
HasIdAndUniqueFields.setUniqueFieldHandler(uniqueFieldHandler);
Ofy.register(FieldValueLock.class);
}
if (uniqueFieldHandler.isRegistered(clazz)) {