Great! When I looked at the retro trunk code, I just noticed I couldn't find the problematic line at the test class anymore. I didn't realize that you were replacing java.lang.Class by java.lang.Object :) Your idea is really good. Maybe, you could apply the same to GenericDeclaration. Replace it by Object, and replace calls to its single method (getTypeParameters) by calls to a Helper, as is done in GenericsHelper. That way, all the problem would be solved, and in a very simple way. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4053565#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...