This week's book giveaways are in the Refactoring and Agile forums. We're giving away four copies each of Re-engineering Legacy Software and Docker in Action and have the authors on-line! See this thread and this one for details.
Hibernate on it's own is an ORM framework. JPA which is part of EJB3 is a standard API for Java persistence. And hibernate has an implementation of JPA which you can use. Of course Hibernate has it's own native API that you can use without JPA, which is how hibernate being used from the beginning.