Servlet [MessageDispatcherServlet]: not a servlet class

I get this error when i deploy my EAR file onto Websphere server. This error comes for all the servlets (2) defined in my deployment descriptor.
I have googled for this error and made sure that there is no jar file inside my WAR's lib. And class loader settings is application first.
My dependencies are loaded from pom.xml. Is there anything i'm required to do here?

PS- i do use servlet-api-2.5 version in my application.

Any pointers would help!

TIA,
Paary