code: public EntityListeners<PersistenceUnitDefaults<T>> getOrCreateEntityListeners()
     {
        Node node = childNode.getOrCreate("entity-listeners");
        EntityListeners<PersistenceUnitDefaults<T>> entityListeners = new EntityListenersImpl<PersistenceUnitDefaults<T>>(this, "entity-listeners", childNode, node);
        return entityListeners;
     }
docs: If not already created, a new <code>entity-listeners</code> element with the given value will be created.
  Otherwise, the existing <code>entity-listeners</code> element will be returned.
  @return  a new or existing instance of <code>EntityListeners<PersistenceUnitDefaults<T>></code>