Hibernate States .

  What are the state of the object in the Hibernate? 

There  are three  state  in Hibernate a). Transient State  b). Persistent State  c). Detached State

1. Transient State:

 A New instance of  a persistent class which is not associated with a Session, has no representation in the database and no identifier value is considered transient by Hibernate:

UserDetail user = new UserDetail();
user.setUserName("bhringi");
Note- user is in a transient state

2. Persistent State:
 A persistent instance has a representation in the database , an identifier value and is associated with a Session. You can make a transient instance persistent by associating it with a Session:

Long id = (Long) session.save(user);

 Note- user is now in a persistent state

3. Detached State:
 
Now, if we close the Hibernate Session, the persistent instance will become a detached instance: it  isn't attached to aSession anymore (but can still be modified and reattached to a new Session later though).

session.close();
Note--user in detached state