Do I need hibernate.cfg.xml if I use JPA?


#1

Hi,

I just learnt that it is better to use EntityManager for transaction management in a JEE web app.

However, many tutorials suggested that I have to create a persistence.xml file.

I’d like to know should I keep the hibernate.cfg.xml file now that I am going to create persistence.xml file and using Entity Manager (which I read is easier compared to hibernate SessionFactory)


#2

You don’t need it. You need just the persistence.xml configuration file if you use JPA.


#3

Alright thanks.

I’m rather confused regarding EntityManager cos EJB also has a EntityManager and EJB/JEE has a dependency injection etc etc…

So, now my question, where does Hibernate comes in given the above ?


#4

EJB is a spec, just like JPA. Hibernate implements the JPA spec. The User Guide explains all this in more details.