I strongly suspect that the problem is related to the following: If an object is created from a class loaded by a different JBoss class loader than the class being cast to, JBoss will throw a ClassCastException even if the object is of the same class as the class being cast to. I ran across this in another context, but it seems likely that this is the problem. I solved that problem by putting the class definition in the server/all/lib directory. Now, does anyone have a solution as I am being bitten by the same problem and this time, putting the class in the lib directory is very suboptimal. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4097646#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...