[cztomsik]

depends if you're doing active record (which I am not considering as typical ORM) or data mapper like hibernate where your entity is POJO with id and annotations but typically no foreign keys (just references to other model classes)

hibernate is then "the magic "environment where it just works"

I realize OO is out of fashion now but it's still true and it still works and I've been in a lots of projects where ORM was useful