Classloader mismatch on what looks like the same class

Issue

• We are facing a class type mismatch issue but the error clearly shows the EXPECTED Class and GOT class are same. The same error disappears after clean restart of tmp files. Caused by: org.hibernate.TypeMismatchException: Provided id of the wrong type for class mypackage.MyClass. Expected: class mypackage.MyClassPK, got class mypackage.MyClassPK.
• We're seeing a ClassCastException where both of the classes have the same name. How can you have an error casting a class to itself?
• In our Switchyard project, we're having a problem SWITCHYARD010813: Cannot convert from 'com.ourclass' to 'com.ourclass' where both classes are the same exact package and classname. Why is this occurring and how can we solve it?