3
votes
1answer
143 views

ORM: Design of the service layer

I'm currently writing a medium sized web-application and find myself asking this question many times. For example, let's say there are users, which have files (one-to-many). How should the UI access ...
2
votes
4answers
336 views

Should OO design, or database design, drive the coding of my @Entity classes?

I have two classes that I want related to each other in an JEE application using JPA2. In an OO world, I would say that a Chatroom has an attribute List messages. In the relational world composition ...