I have a scenario in which i need to use 2 ( or possible more ) genreators for some column values ( 1 for PK and other some extra keys), how do i define these mappings in the hibernate mappings ?.

Thanks

The only chance you have to use generator outside the <id> declaration (primary key) is described here:

http://www.hibernate.org/hib_docs/v3/re ... ions-idbag

If it meets your need, great. If not, those are the only places you can use a generator (you can check this by looking at the hibernate mapping dtd)