Archaius should provide some simple syntax to describe the parametrized collection types that are decodable by default.

[rgallardo-netflix]

AbstractConfig#getValueWithDefault(Class, String, T) is NOT able to decode collection types, but AbstractConfig#(Type, String, T) can, if a ParametrizedType is passed. We should provide a shorthand method to create such ParametrizedTypes. Otherwise, users are forced to hunt themselves for a way to create them.

Apache Commons Lang 3's TypeUtils has sample code that we could copy and specialize for this restricted use case.