December 2002
Intermediate to advanced
1050 pages
24h 49m
English
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The Session Bean Code
The session bean declared for the shopping cart EJB demonstrates object-oriented code reuse by simply extending the ShoppingCartBean class developed for the first example. Since the EJB specification allows EJBs to be part of an inheritance hierarchy (even though they themselves cannot be extended), this use of inheritance is allowed.
The ejbCreate method shown next has been overloaded to accept an argument for the userID. This integer value is passed to the method and used to set the userID for the shopping cart. All other functionality provided by the session bean is in fact provided by its superclass, the ShoppingCartBean. Note that any methods exposed in the session bean's remote interface must be declared public (which ...
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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.