There's a little difference in generics used in
http://download.java.net/lambda/b104/docs/api/java/util/stream/Stream.html#collect(java.util.stream.Collector)
and
http://download.java.net/jdk8/docs/api/java/util/stream/Stream.html#collect(java.util.stream.Collector)

Looks like this difference needs to be eventually eliminated.