June 2013
Beginner
608 pages
17h 57m
English
Content preview from Beginning Java EE 7
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CHAPTER 7
Enterprise JavaBeans
The previous chapter showed how to implement persistent objects using JPA and how to query them with JPQL. Entities can have methods to validate their attributes, but they are not made to represent complex tasks, which often require an interaction with other components (other persistent objects, external services, etc.). The persistence layer is not the appropriate layer for business processing. Similarly, the user interface should not perform business logic, especially when there are multiple interfaces (Web, Swing, portable devices, etc.). To separate the persistence layer from the presentation layer, to implement ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.