CODEWITHSUNDEEP
jpaejb-3.0websphereentitymanager
mihaela
mihaela

Reputation: 219

Websphere 7 EntityManagerFactory creation problem

I'm working on a maven project which uses seam 2.2.0, hibernate 3.5.0-CR-2 as JPA provider, DB2 as database server and Websphere 7 as application server. Now I'm facing de following problem:

On server logs it sais that it cannot create an EntityManagerFactory and gets a ClassCastException:

java.lang.ClassCastException: org.hibernate.ejb.HibernatePersistence incompatible with javax.persistence.spi.PersistenceProvider

After a lot of debugging and searching on forums I'm assuming that the problem is that Websphere doesn't use the Hibernate JPA provider.

Has anyone faced this problem and has a solution? I configured already WAS class loader order for my application to load the classes with the application class loader first and I\ve packed all necessary jars in application ear as written in: WAS InfoCenter: Features for EJB 3.0 development . If necessary I'll post my persistence.xml, components.xml files and stack trace.

I've found this problem discussed also here:

Any hint will be useful.
Thanks in advance!
Mihaela

Upvotes: 1

Views: 6282

Answers (1)

Brett Kail
Brett Kail

Reputation: 33936

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.

Upvotes: 4

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