org.jboss.weld.bean.proxy.ClientProxyProvider.createClientProxy(Bean<T>, Set<Type>)
In this method there is a call of typeInfo.getSuperClass() which returns Object.class in case of an Interface.

Thomas Wöckinger This means that typeInfo.classes is empty right? I wonder how this can happen since the incoming Bean is of type MyImpl and should have 3 types in this classes set (considering the type structure you described here).