Getting the class name of the super class?

I am writing some code to check the structure of other people's code.

Lets say ClassB extends ClassA

I know I can do

Class clazz = Class.forName("classB");
clazz.getSuperclass();
clazz.getName(); //ClassA

but I dont want to do it this way because it requires my jvm return the actual class of ClassA (which is not in the classpath)

currently I am using

Class clazz = Class.forName("classB", false, classLoader);

to not initialize the class, so that I dont have to put so many irrelevant jars into my classpath.

Is there a way I can get the Super's classname from ClassB without requiring me to include ClassA's jar in the classpath?