April 2003
Beginner to intermediate
380 pages
12h 25m
English
Content preview from Java Data ObjectsBecome 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,
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.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.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.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.
Bean-Managed Transactions
Bean-managed transactions offer the stateless session bean developer additional flexibility, but at the cost of additional complexity.
There are two alternate techniques for demarcating transaction
boundaries in your bean code: use the server’s javax.transaction.UserTransaction or use the PersistenceManager’s javax.jdo.Transaction. If you use UserTransaction, you can begin and complete
distributed transactions managed by the server’s TransactionManager. If you use JDO’s Transaction, you begin and complete local
transactions that are managed completely by the JDO implementation,
without any help (or interference) from the container.
javax.transaction.UserTransaction
To use UserTransaction
, you obtain it via getUserTransaction(
) from the SessionContext
instance, begin the transaction, and then obtain the PersistenceManager from the PersistenceManagerFactory. During getPersistenceManager( ), the PersistenceManagerFactory will automatically
associate the PersistenceManager
with the active UserTransaction.
When your bean invokes methods of beans that use container-managed transactions, the container
automatically associates transactional resources used by the other
beans in the current UserTransaction. The transactional resources
can be JDO PersistenceManagers,
JDBC Connections, or
connector resources.
If you require nontransactional access to JDO, you must obtain
the PersistenceManager when the
UserTransaction is not active.
After beginning a UserTransaction ...
Become 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,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.