I'm developing a Seam/jBPM4 web application. I can already hot deploy processes through the web interface, start and signal processes, storing String and Integer variables within them... My problem arises when I try to attach and store an entity variable. My application and jBPM share the same datasource, but I know mine uses JPA and jBPM uses Hibernate, so there's sort of mismatch. I tried the no-brainer: adding my entity as a variable and saving, but it obviously won't work: org.hibernate.HibernateException: instance not of expected entity type: org.jbpm.pvm.internal.type.variable.UnpersistableVariable is not a: org.jbpm.pvm.internal.type.Variable I've debugged jBPM code and I've reached org.jbpm.pvm.internal.type.matcher.HibernateIdMatcher. The line where my variable will become "UnpersistableVariable" is sessionFactory.getClassMetadata(value.getClass()), which will return null. How should I configure class metadata? Can I share the entity between jBPM and Seam? Can I somehow hot deploy classes and metadata? (maybe in a .bar file) I've searched through the documentation and examples, but there's not much information on hibernate entities as variables. Thank you in advance! View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4269015#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...