May 2001
Intermediate to advanced
1088 pages
30h 13m
English
Content preview from Special Edition Using Java™ 2 Enterprise EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Message-Driven Beans
Version 2.0 of the EJB specification introduced a new kind of EJB: the message-driven bean. Unlike entity or session beans, message-driven beans don't have a public interface. The only way you can communicate with message-driven beans is via messages.
Message-driven beans are much easier to write than either session beans or entity beans. You must still write ejbCreate and ejbRemove to initialize the bean and clean up when you're done. You must also implement ejbActivate and ejbPassivate just because they're required by the EJB specification, but they are not a part of the message-driven bean lifecycle. Be cause message-driven beans have no public interface, they have no Home or Remote interfaces.
You must implement the ...
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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.