How to cast two instance of the same loaded different classloader?

I have two different webapps, and each load the same class A with different classloader. When I put one instance in the session and then get it from the other webapp, a ClassCastException is thrown.

For example, in webapp A, I store a in the session, then in webapp B, I get the a from the session and cast it to A, the ClassCastException is thrown.

Is there a way to resolve this?