[hibernate-dev] Unable to dispatch Entities in different jars

[Emmanuel Bernard]

Splitting entities amongst several JARs is definitely supported by JPA 2, you need to use the <jar-file> element in persistence.xml (or to a lesser extend <class>).
Merging several persistence.xml and considering them one is not a concept that makes sense in the JPA 2 spec. Conceptually that means a lot of metadata duplication that can and will conflict.
The exception you see comes from the fact that your "merging" does not "unduplicate" jar file urls and it's associated root url.

Emmanuel

On 3 févr. 2010, at 17:43, Bouiaw wrote:

> Hi,
> 
> I would like to warn you about a blocking (from my point of view)
> issue in Hibernate 3.5 (JIRA issue :
> http://opensource.atlassian.com/projects/hibernate/browse/HHH-4864).
> 
> Dispatching entities is not supported out of the box by Hibernate/JPA,
> but with a small tweak commonly used
> (http://ancientprogramming.blogspot.com/2007/05/multiple-persistencexml-files-and.html)
> it is possible to acheive this.
> 
> This worked with previous version of Hibernate, but not anymore in
> Hibernate 3.5 betas.
> 
> Even if this is not specified in JPA, this is mandatory for a lot of
> developer to do modular applications (each module (JAR) provide its
> own DAO, business and model layer).
> 
> I hope you will be able to fix HHH-4864, because this is a blocking
> point for a lot of developers.
> 
> Thanks in advance for your feedback,
> Bouiaw
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