September 2001
Intermediate to advanced
592 pages
18h 22m
English
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Chapter 9. EJB 1.1 CMP
A Note for EJB 2.0 Readers
Container-managed persistence has undergone a dramatic change in EJB 2.0, which is not backward compatible with EJB 1.1. For that reason, EJB 2.0 vendors must support both EJB 2.0’s container-managed persistence model and EJB 1.1’s container-managed persistence model. The EJB 1.1 model is supported purely for backward compatibility, so that application developers can migrate their existing applications to the new EJB 2.0 platform as painlessly as possible. It’s expected that all new entity beans and new applications will use EJB 2.0 container-managed persistence, not the EJB 1.1 version. Although EJB 1.1 container-managed persistence is covered in this book, avoid it unless you maintain a legacy EJB 1.1 system. EJB 2.0 container-managed persistence is covered in Chapter 6 through Chapter 8.
EJB 1.1 container-managed persistence is limited in several ways. For
example, EJB 1.1 CMP beans can have only remote component interfaces;
they are not allowed to have local or local home interfaces. Most
importantly, EJB 1.1 container-managed entity beans do not support
relationships. Other subtle differences also make EJB 1.1 CMP more
limiting than EJB 2.0 CMP. For example, the
ejbCreate()
and
ejbPostCreate()
methods in EJB 1.1 do not support the
<
METHOD-NAME
>
suffix allowed in EJB 2.0, which makes method overloading more
difficult. EJB 2.0 CMP is a major improvement over CMP 1.1 and should
be used if at all possible.
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.