Getting class cast exception where both classes are exactly the same

Question

I am doing a JBoss SEAM project and when I view a form I get this error.

java.lang.ClassCastException:
it.cogitoweb.csi.entity.csiorelav.CsiTipoLav cannot be         


        

Answer 1

This is because the class has been loaded by two different classloaders. You cannot cast between them.

You've likely got a duplicate copy of CsiTipoLav in your application, and the two different copies are being loaded at different times from different classloaders. JBoss has a plethora of different classloaders in a hierarchy, and it's easy to get things in a twist.

Make sure you only have one copy of the class.