I think it's basically the O part. In theory, one might have a delightful ontology of object oriented code, like Animal->Mammal->Cow , but in reality you often

I think it's basically the O part. In theory, one might have a delightful ontology of object oriented code, like Animal->Mammal->Cow , but in reality you often have something much more like CompanyNamePersistentObjectBaseClass->Entity->ExtendedPersistentEntity->CacheFactory->Entity(but in a different package)->NeedToAddAPropertyForJustThisReleaseIPromiseThisClassIsGoingAway->IdAddThisToTheBaseClassButIReallyNeedToRelease->Shape->Triangle->XYCoordinates and then somebody wants to cache these things in hibernate.