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From "Patrick Linskey" <>
Subject RE: Extending the OpenJPA implementation
Date Tue, 15 Aug 2006 17:46:26 GMT
> There's one last problem, and that is systems with multiple OpenJPA  
> extended products available.  If you've got Kodo and  
> ExtendedOpenJPAProductX in your classpath, chances are they'll  
> attempt to overwrite each other's configuration defaults and so  
> forth.  That's the case now, and what I've proposed thus far does  
> nothing to alleviate it.  I think we could probably figure something  
> out where the extended product looks for its own PersistenceProvider  
> type in persistence.xml when attempting to load() conf, (this is a  
> good reason to extend PersistenceProviderImpl even when not  
> necessary), and the resulting ConfigurationProvider somehow records  
> this info in the Configuration such that other product 
> extensions can  
> check to see if they're compatible with whatever originally loaded  
> the Configuration in their beforeConfigurationLoad, etc 
> callbacks.  I  
> don't think this is critical right now and I obviously 
> haven't worked  
> out any details, but it might be something we'll want to tackle  
> eventually.

I agree that this is something that we should work out, and is the
reason that I mentioned earlier that we might want a Kodo-specific
PersistenceProvider at the end of the day. Seems like it's in everyone's
best interests for multiple systems with different OpenJPA derivatives
to behave deterministically.

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