Hibernate LocalSessionFactrory VS HibernateTransactionManager

I am implementing a application with Struts2 + Spring + Hibernate.

I would like to know what is the difference between using LocalSessionFa开发者_如何转开发ctory alone in Spring's applicationContext.xml and using HibernateTransactionManager, having the LocalSessionFactory injected.

look at http://community.jboss.org/wiki/Non-transactionalDataAccessAndTheAuto-commitMode especially at Working nontransactionally with Hibernate