Lets say, we need to do a couple of save/updates on different objects inside struts Action's execute(). What is the best way to handle Hibernate Transaction in the execute()?
If we want it as an atomic operation, should we create the transaction in the beginning of the execute() and commit it at the end? If we do that, we have to pass this transaction object to all the DAO's methods as an argument. Just want to see what is the best approch for this? Appreciate any help. Thanks!

Nope, no need to pass the transaction object to the DAO. That's a nasty anti-pattern.

The most common approach, and simplest, is the open session in view type of approach, where the transaction is started as soon as the request comes in, and committed just before the response goes out. The tx context is automatically passed to the DAO objects through the transactional context. It's all very nifty!

Here's a little tutorial I put together on using advanced DAOs. It applies to Struts, but I think I just demonstrate with simple Servlet and JSP apps:

http://jpa.ezhibernate.com/Javacode/lea ... vanceddaos