Websphere 7 EntityManagerFactory creation problem?

I suspect that you've included the JPA API jar in your EAR. When using "parent last" (also known as "load classes with application class loader first"), your application is loading a second copy of the javax.persistence.spi. PersistenceProvider class, which is incompatible with the copy included in WAS.

You need to either remove those classes from your EAR or change back to "parent first" delegation mode.

Thank you for the hint. Indeed I've included also the JPA API jar in my EAR. This didn't solve my problem yet (anyway I got another exception), but I must first review the jars needed for bernate and the correct scope.

– mihaela May 6 '10 at 7:47 Well, I can't help solve your problem unless you describe it :-). Perhaps upvote and update your problem description, or accept and start a new question? – bkail May 6 '10 at 14:05 I'm still trying some scenarious and only after that I can come back with a more clear description – mihaela May 6 '10 at 14:42.

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