[jboss-user] [EJB 3.0] - Re: concurrently modifying entity instance
have you tried it? What makes you think a lock won't propagate to the database (not saying it won't, but I'd be surprised if it didn't)? View the original post : http://www.jboss.com/index.html?module=bbop=viewtopicp=4144717#4144717 Reply to the post : http://www.jboss.com/index.html?module=bbop=postingmode=replyp=4144717 ___ jboss-user mailing list jboss-user@lists.jboss.org https://lists.jboss.org/mailman/listinfo/jboss-user
[jboss-user] [EJB 3.0] - Re: concurrently modifying entity instance
You made me believe an actual advise was posted, anyway: As reference says, the lock is honored at persistence-context level. Since two sessions are involved, there exists two different persistence-contexts, so EntityManager.lock() issued in one session has not enough 'reachability'. Besides, the lock (either READ or WRITE) granted by EntityManager.lock() is not semantically equivalent to pessimistic lock. In other words no thread is getting blocked when accessing an already locked entity. That is why I'm looking for expert advise. View the original post : http://www.jboss.com/index.html?module=bbop=viewtopicp=4144748#4144748 Reply to the post : http://www.jboss.com/index.html?module=bbop=postingmode=replyp=4144748 ___ jboss-user mailing list jboss-user@lists.jboss.org https://lists.jboss.org/mailman/listinfo/jboss-user
[jboss-user] [EJB 3.0] - Re: concurrently modifying entity instance
I think, what you are looking for is the @Version attribute for your entity. This allows optimistic locking. See this for more details: http://www.oracle.com/technology/products/ias/toplink/jpa/resources/toplink-jpa-annotations.html#Version Let us know, if this doesn't serve your purpose. View the original post : http://www.jboss.com/index.html?module=bbop=viewtopicp=4144751#4144751 Reply to the post : http://www.jboss.com/index.html?module=bbop=postingmode=replyp=4144751 ___ jboss-user mailing list jboss-user@lists.jboss.org https://lists.jboss.org/mailman/listinfo/jboss-user
[jboss-user] [EJB 3.0] - Re: concurrently modifying entity instance
No, it doesn't. I'm aware of potential disadvantages of pessimistic locking, however that is needed here. So the question is how to implement pessimistic locking. View the original post : http://www.jboss.com/index.html?module=bbop=viewtopicp=4144940#4144940 Reply to the post : http://www.jboss.com/index.html?module=bbop=postingmode=replyp=4144940 ___ jboss-user mailing list jboss-user@lists.jboss.org https://lists.jboss.org/mailman/listinfo/jboss-user
