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From "Patrick Linskey" <>
Subject RE: Generation of entity classes
Date Mon, 01 Jan 2007 10:36:22 GMT
Generally-speaking, you should be able to bootstrap new classes into
OpenJPA over time. There are some situations that will prevent this
(i.e., if exclude-unlisted-classes is set to true, and possibly some
automatic class-scanning modes).


Patrick Linskey
BEA Systems, Inc. 

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> -----Original Message-----
> From: Dain Sundstrom [] 
> Sent: Sunday, December 31, 2006 9:19 PM
> To:
> Subject: Re: Generation of entity classes
> Actually, never mind.  Due to the interconnectedness of persistent  
> classes (i.e., relationships), I need to generate all the classes at  
> once and add them all to the class loader at the same time.  This  
> means my "elegant" solution is just broken :)
> -dain
> On Dec 31, 2006, at 3:12 PM, Dain Sundstrom wrote:
> > I working on an implementation of the EJB cmp specification which  
> > uses JPA under the covers to implement the persistence.  I 
> have the  
> > basics working with hand written subclasses of the abstract cmp2  
> > beans.  I just wrote a code generator to replace my hand coded  
> > subclasses using ASM (which rocks), and I am having problems  
> > getting OpenJPA to enhance my generated class.  It appears that at  
> > the moment I construct the EMF all entity classes must be 
> available  
> > via the temp class loader.  If they are not, OpenJPA will not add  
> > an entry into the MetaData repository.  Later when I generate my  
> > class and load it, the OpenJPA transformer looks for the MetaData  
> > in the repository, doesn't find it, and completely skips  
> > enhancement (PCEnhancer line 322).  It is possible to have the  
> > enhancer fault load the metadata and continue with enhancement?
> >
> > In the mean time, I'm going to hack OpenEJB to kick off generation  
> > very early in deployment, but it would be much more elegant 
> to wait  
> > until the EJB is deployed to generate the classes and this happens  
> > after JPA is initialized.
> >
> > Thanks,
> >
> > -dain

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