http://www.gontu.org in this tutorial, we will learn what is the real use of a one to one mapping in hibernate along with other important concepts which we did not learn in the last tutorial i.e what is a cascadeType in hibernate, what is a Unidirectional one to one mapping and what is a Bidirectional one to one mapping.
Unidirectional vs bidirectional one to one mapping in hibernate.
http://www.gontu.org