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From "Patrick Linskey" <plins...@bea.com>
Subject RE: Getting all the ClassMetaDatas
Date Tue, 02 Jan 2007 09:37:59 GMT
What happens if you use MetaDataRepository.getPersistentTypeNames()
instead?

-Patrick

-- 
Patrick Linskey
BEA Systems, Inc. 

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> -----Original Message-----
> From: Shay Banon [mailto:kimchy@gmail.com] 
> Sent: Tuesday, January 02, 2007 12:34 AM
> To: open-jpa-dev@incubator.apache.org
> Subject: Re: Getting all the ClassMetaDatas
> 
> 
> I tried to open the entity manager before I get the 
> ClassMetaData, but I
> still get an empty array. Here is what I do:
> 
> OpenJPAEntityManagerFactory emf =
> OpenJPAPersistence.cast(entityManagerFactory);
> EntityManager entityManager = emf.createEntityManager();
> entityManager.close();
> 
> ClassMetaData[] classMetaDatas =
> emf.getConfiguration().getMetaDataRepositoryInstance().getMetaDatas();
> 
> I do enumerate the classes in my persistence context, and I 
> can see in the
> logging that OpenJPA parses the classes.
> 
> 
> Marc Prud wrote:
> > 
> > Shay-
> > 
> > Have you already obtained an EM from the EMF before you make this  
> > call? If you try to get the metadatas after calling  
> > emf.getEntityManager(), do you still see an empty list?
> > 
> > Also, note that unless you enumerate the classes in your  
> > persistence.xml file (in the <class> elements), the only way the  
> > system will be able to know about your classes before they 
> are lazily  
> > evaluated is if you enable one of the scanning features (e.g., but  
> > packaging all your classes in a jar and specifying the <jar-file>  
> > element in the persistence.xml, which will be automatically 
> scanned  
> > for persistent classes).
> > 
> > You might want to enable verbose logging and watch the make 
> sure the  
> > class metadatas are registered before you try to get the list from  
> > the repository.
> > 
> > 
> > 
> > On Jan 1, 2007, at 4:11 PM, Shay Banon wrote:
> > 
> >>
> >> Hi,
> >>
> >>    First, I hope that this is the correct forum for posting  
> >> questions, so
> >> sorry if it isn't.
> >>
> >> I have an external list of classes that I would like to match  
> >> against the
> >> persistent classes that are defined/identified by OpenJPA. 
> I would  
> >> really
> >> like to get the ClassMetaData for each one, since it has a lot of
> >> information that I could use. This intersection happens after the
> >> EntityManagerFactory has been created.
> >>
> >> I have tried using:ClassMetaData[] classMetaDatas =
> >> 
> emf.getConfiguration().getMetaDataRepositoryInstance().getMetaDatas();
> >>
> >> But it seems like the meta data repository and ClassMetaData  
> >> information are
> >> lazily loaded (i.e. when some operation is performed on a 
> Class, the
> >> relevant meta data is fetched if not found in cache). So, what I  
> >> get is an
> >> empty array (even though I can see the OpenJPA identified the  
> >> classes).
> >>
> >> I wonder how I would be able to get all the class meta data?
> >>
> >> Something that I was thinking about is since I have the list of  
> >> classes that
> >> I would like to check if they are persistent, I could call:
> >> getMetaData(Class cls, ClassLoader envLoader, boolean 
> mustExist), with
> >> Thread context class loader and false in mustExists. I am 
> guessing  
> >> that it
> >> will load the ClassMetaData if not found. My main problem 
> here is that
> >> OpenJPA might be configured with a different class loader 
> (though it
> >> defaults to the thread context one).
> >>
> >> Any suggestions?
> >>
> >> p.s.
> >>
> >> I am the author of Compass, so once I have this nailed down, we  
> >> will have
> >> Search capabilities to OpenJPA ;)
> >>
> >> -- 
> >> View this message in context: 
> http://www.nabble.com/Getting-all-the- 
> >> ClassMetaDatas-tf2905426.html#a8116958
> >> Sent from the open-jpa-dev mailing list archive at Nabble.com.
> >>
> > 
> > 
> > 
> 
> -- 
> View this message in context: 
> http://www.nabble.com/Getting-all-the-ClassMetaDatas-tf2905426
.html#a8121096
> Sent from the open-jpa-dev mailing list archive at Nabble.com.
> 
> 

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