It was a very, very, very useful lecture. Background and pros and cons of data access technologies!, concerns about trade-offs!! And transactions!!! When I first used it, I just saw on the Internet that I could just attach @transactional and used it The principles and understanding seemed complicated and headache-inducing and I didn't have time, so I skipped over transactions thinking I'd look them up later... How many people in the world can explain it this easily and understandably? I'll review it right away and go look at the advanced version starting tomorrow.