This is only a small topic, but maybe valuable for some readers. You already list the JDK 8 as a Web Resource. Think about adding (or emphasizing in a short comment) the very valuable JDK docs (especially the API docs). They contain fundamental explanations how to use (and not to misuse) the new API, with many examples. The explanations are sometimes dense, but after reading your great book they will be understandable for most readers.