How can I determine the unerased type of a field?

I have a generic response wrapper class:

public class Response <T> {
    T response;
}

and a class to be wrapped:

public class ServiceResponse {
    String someField;
}

When I'm deserializing an instance of Response I need to know the type of response or, by extension the actual unerased type of T.

I can use something like:

Response<ServiceResponse> response = new Response<>();
Field field = response.getClass().getDeclaredField("response");
Type type = field.getGenericType();

which then tells me that response is of type T but what I actually need is ServiceResponse

Per this SO question I tried casting as ParameterizedType but that would actually seem to apply to a field of type Response<ServiceResponse> and not the actual field within (and it fails because type can't be cast as ParameterizedType)

Is there any way to determine (at run time) the raw type of response?