[Hibernate-devel] EJB Transactions

[Brad C. <bra...@wo...>]

The procedure for writing session beans (using hibernate) that participate
in EJB transactions is not immediately apparent from the documentation.
Perhaps a note could be added to the documentation that specifies that for
this situation, the successful way to create a transaction aware hibernate
session is via:

    sessionFactory = datastore.buildSessionFactory();
    session = sessionFactory.openSession(connection);

The system properties mechanism and passing Properties to the
buildSessionFactory will not work.

This is due to the fact that the session.commit() (and cancel) methods
behave differenently, depending on how the session was obtained.  If the
session was obtained using one of the properties mechanisms, than hibernate
will flush the session, commit and close the connection, which breaks the
EJB transaction.  If the session is obtained by passing in a connection,
then it is up to the user (or the EJB container, in this case) to commit the
connection and the programmer to close the connection.

brad
_______________________________
brad clow
chief technical officer
workingmouse

email: bra...@wo...
web:   http://www.workingmouse.com