This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
Hibernate ? Doh, sorry I'm not an Hibernate user. I'm using iBatis, and I make some TypeHandlerCallback classes to use custom types. I guess Hibernate has the same kind of stuff, but I can't tell you. Sorry.