CastMessageWithFuture in MessageDispatcher

When I used CastMessageWithFuture in MessageDispatcher. I found the following Method declared :
public <T> NotifyingFuture<RspList<T>> castMessageWithFuture(java.util.Collection<Address> dests, Message RequestOptions options, FutureListener<T> listener) throws java.lang.Exception

Is it the FutureListener<T> may be declared to FutureListener<RspList<T>> ?