hello ,

it is a doubt about three tier app with hibernate .

Inside tha data layer i have created a HibernateSessionFactory class
that uses a thread local pattern for creating session and transactions
( adopted from hibernate in action )

also i have a UserDAO class in data layer .
inside the constructor started the transaction ..

as this is called from business layer where should be the correct place to
commit and close the transaction ..


thanks

Using EJBs: let the container do the job of opening and closing transactions.
Using POJOs: You can put it your Bussiness-Layer or you put in Controller in the web-tier (e.g. in a RequestProcessor when using Struts). Or you can try a servlet filter.

Those topics are more explained in the great book Hibernate in Action