[jboss-user] [EJB 3.0] - Re: difference between @Version and EntityManager.lock

@Version will enable JPA Optmistic locking for the entity. EM.lock allows the application to specify the lock mode to be used on the versioned object. http://java.sun.com/javaee/5/docs/api/javax/persistence/LockModeType.html This is no JPA "waiting" or caching of updates to an entity until another Tx is finished with it; that responsibility is on the part of the application. JPA locking provides you with a mechinism to ensure your data integrity is kept. S, ALR View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4052899#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...