February 2004
Intermediate to advanced
848 pages
27h 25m
English
Content preview from WebLogic: The Definitive GuideBecome 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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EJBs and Transactions
WebLogic’s EJB container supports EJBs that can participate in distributed transactions. EJBs deployed to WebLogic Server can be involved in JTA transactions that may cover updates to multiple data stores. A single transaction can span multiple EJBs deployed to multiple WebLogic instances. The EJBs also can participate in the two-phase commit protocol, which coordinates transactional updates across two or more resource managers.
For entity beans, it is the EJB container that always manages the
transaction boundaries. Session and message-driven beans support both
bean-managed and container-managed transactions. In the case of
bean-managed transactions, the EJB implementation must explicitly
supervise the transaction boundaries. Typically, the EJB code will
acquire a reference to the UserTransaction object
from the EJBContext, and then make explicit calls
to the begin, commit, and
rollback methods to mark the start and completion
of the transaction. For container-managed beans, the EJB container
manages all transaction boundaries. You can specify the transaction
attributes for the EJB methods in the
ejb-jar.xml descriptor file for the EJB
component. The default transaction setting for an EJB method is
Supports. In other words, all EJB methods are
capable of participating in a transaction, if one exists. Of course,
you must not use the
UserTransaction interface within an EJB method
that supports container-managed transactions.
Distributed transactions
A client ...
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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.