This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
Is a thread that was rather similar (but asking how Spring fits into Hibernate+Struts that the OP was used to in that case). My post near the bottom of the thread lists my thoughts on how they all fit together.