ClassCastException when casting to the same class

Question

I have 2 different Java projects, one has 2 classes: dynamicbeans.DynamicBean2 and dynamic.Validator.

On the other project, I load both of

Answer 1

Another option:

Happened to me in weblogic, but I guess it can happen in other servers as well - if you do (just) "Publish" and therefor some of your classes are re-loaded. Instead do "Clean" so all the classes will re-loaded together.