I was having the same kind of problem, see 
http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4219306.

To resolve these classloading issues you have to ensure that the classloader 
that hibernate uses knows about (i.e. can load) your hbm.xml files and the 
entity classes. For now I resolved the classloading issues by placing these 
files under deploy/jbpm/jbpm-enterprise.jar/. Of course this is just a hack. A 
better solution should be packing everything into a single EAR.

It might be possible to change the classloading to enable hibernate getting 
access to the par file's content. The Eclipse OSGI implementation has "Buddy 
Policy" to resolve similar issues (see 
http://wiki.eclipse.org/index.php/Context_Class_Loader_Enhancements). This 
would be the best solution (since then the entities could be versioned too) but 
I think that it would require changes to the jBPM sources.

Volker

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