Hello, I don't know yet how to reproduce, specifically the second one. But I'm working on that :). I suppose the issue must be linked somehow to the jar, that is placed outside of the ear (which is supposed to hold the interfaces and model classes, which are used by other apps). The deserialization exception stopped showing up when I removed the <loader-repository> element from jboss-app.xml, but then Hibernate Search stopped working (it started to complain about an index on a field missing, but without any specifics ...) -- Adam View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4118592#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...