Handling of Persistent Entity in persist()

protected void entityIsPersistent(PersistEvent event, Map createCache) {
  LOG.trace( "Ignoring persistent instance" );
  final EventSource source = event.getSession();

  //TODO: check that entry.getIdentifier().equals(requestedId)

  final Object entity = source.getPersistenceContext().unproxy( event.getObject() );
  final EntityPersister persister = source.getEntityPersister( event.getEntityName(), entity );

  if ( createCache.put( entity, entity ) == null ) {
    justCascade( createCache, source, entity, persister );
  }
}