How to get the actual type arguments to an indirectly implemented generic interface?

Question

I have a parameterized interface that is implemented in many different ways. At run time I need to figure out, given an arbitrary object that implements that interface, what the

Answer 1

Following proposal of @oconnor0, here is how to do it with gentyref:

static Type investigate(Awesome somethingAwesome) {
    return GenericTypeReflector.getTypeParameter(somethingAwesome.getClass(), Awesome.class.getTypeParameters()[0]);
}

In case somethingAwesome.getClass() could be also generic, it might be useful to pass it through GenericTypeReflector.addWildcardParameters first.

Spring has also a GenericTypeResolver.resolveTypeArgument(Class,Class) which can achieve the same result.