What is ORM Tool & why use of orm tool
Advantage – Cache Management, Session Management,
Transaction Management, Configuration, SessionFactory,
Session , Transaction, Query(hql), Criteria, hbm,cfg,
annotation, First level cache,Second level cache,
Mapping (Association & Inheritance)

one -to- one, one-to- many, many-to- one,many-to- many,
Table per class, Table per subclass, Table per concrete
Struts1.2 use with Hibernate & Struts2.0 use with Hibetnate