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From Andrus Adamchik <>
Subject Re: Cayenne and EJB
Date Sun, 11 Apr 2010 13:47:04 GMT
Hi Michael,

I am not aware of any tutorials specifically dealing with EJB  
integration, but it should definitely be possible to use Cayenne. Two  
things I can think about that may help in the EJB environment:

1. Checking "container managed transactions" for the DataDomain in the  
modeler. This would prevent Cayenne from committing JDBC connections,  
letting the container handle that.

2. Use thread-bound ObjectContext  
(BaseContext.bindThreadObjectContext(..)), so that the same context  
and its ojects can be shared between all EJBs in the same transaction.  
(there may be other patterns of context use as well, this is just most  
common and natural one).


On Apr 11, 2010, at 2:04 PM, Michael K wrote:
> Hi,
> I'm new to cayenne, and I would like to find out whether it is  
> possible to use Cayenne in my EJB3.0 project?
> My plan is to use Cayenne as a persistence engine rather than using  
> the standard EJB entity.
> If possible, are there any samples or tutorials that show me where  
> to start?
> Thanks in advance.
> Michael

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