resolveObserverMethods(T event, Annotation... qualifiers)
{
HashSet<ObserverMethod<? super T>> set
= new HashSet<ObserverMethod<? super T>>();
BaseType eventType = createBaseType(event.getClass());
for (Annotation qualifier : qualifiers) {
if (! isQualifier(qualifier.annotationType()))
throw new IllegalArgumentException(L.l("{0} is not a valid qualifier because it is missing a @Qualifier annotation",
qualifier));