JBoss Caching and multiple Entity Manager issues

vfpeter Nov 8, 2007 5:30 PM

I need to update our backup database server when I am writing to our current database server.

So I am using two Entity Managers to handle this and pass the same Entity.

em.persist(dmvActivity);
 em.flush();

 // write to HotSite DB
 emTml.persist(dmvActivity);
 emTml.flush();

This worked fine, till I made the entity cacheable. Now I get the following error :

javax.ejb.EJBException: javax.persistence.PersistenceException: org.hibernate.PersistentObjectException: detached entity passed to persist: com.cp.mvr.common.ejb.persistence.DmvColor

Further, if an entity is set as cacheable, everytime when you do a findAll does the cache get refreshed from the database?

Thanks,
Peter.

1. Re: JBoss Caching and multiple Entity Manager issues

genman Nov 8, 2007 5:34 PM (in response to vfpeter)

This is probably an EJB3 question, as this exception should be expected in either case.

Make a copy of the object, using a copy-constructor or whatever, then persist the copy to the other entity manager.
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2. Re: JBoss Caching and multiple Entity Manager issues

vfpeter Nov 9, 2007 9:19 AM (in response to vfpeter)
Thanks genman.

I cloned my object. But I still get the same exception.

Now if I made my entity non caching, then it works fine. This is the code I use to make my entities cacheable.

@Cache (usage=CacheConcurrencyStrategy.TRANSACTIONAL)
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3. Re: JBoss Caching and multiple Entity Manager issues

brian.stansberry Nov 9, 2007 9:26 AM (in response to vfpeter)

I think you'll have better luck getting an answer on the Hibernate forums at hibernate.org. This seems to be more a question about how Hibernate deals with entities when a 2nd level cache is configured, rather than about the details of JBC.
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4. Re: JBoss Caching and multiple Entity Manager issues

vfpeter Nov 9, 2007 9:51 AM (in response to vfpeter)

Thanks Brian. I will try that.
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