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

[ALRubinger]

@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

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