Hibernate: A stateless session for bulk work

StatelessSession session = sessionFactory.openStatelessSession();
Transaction tx = session.beginTransaction();

try (var rows = repo.streamAll()) {
    rows.forEach(session::insert);
}
tx.commit();
session.close();

A normal session holds every entity until flush and eventually OOMs.
A stateless session holds none - but you lose cascading and lazy loading.