Hi Tom, Sorry, but we started this thread indeed with just serializing objects into blobs. My use case was: Get a sample running with the web console. There I added some "business objects" to the process by an action handler. These objects were just deployed together with the process definition. When I arrived in a task form I got the exception, because the class cannot be found for deserializing (and the root cause isn't shown in the console, so it wasn't straight forward to figure out what was the problem). It wasn't a hibernate class and not the any association... With a hibernate class IT MUST be on the classpath, because it is in the hibernate mapping, no problem here I think... View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4155214#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...