This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
Please search this forum - this has been discussed many times before and very recently too. Also take a look at the Bunkhouse for Hibernate books reviews. You can even search there for JPA books. JPA is the specification which Hibernate (and other implementations) follow.