Getting the generics of a superclass can be accomplished by calling the getGenericSuperclass() method of the current class:

Type superclassType = clazz.getGenericSuperclass();

Calling printGenerics(superclassType) will output the following:

Class of type argument: class java.lang.String
Simple name of type argument: String

Class of type argument: class modern.challenge.Seed
Simple name of type argument: Seed