While very basic introductory examples are invaluable in explaining a new API, they can fail to do a rich API justice - especially from the perspective of more experienced developers. For some of us, looking at a slightly more involved, realistic example can shed far better light on the practical value proposition for a technology.
Faces Flows are one of the best hidden gems in Java EE 7. Standardized in JSF 2.2 they enable web application flow state management in an elegant, declarative fashion. In an excellent blog post, Liferay Faces project lead and JSF 2.2 expert group member Neil Griffin takes an in-depth look at Faces Flows. He explains the motivation for the feature, contrasts it with the Java EE 6/CDI 1.0 conversation scope and demonstrates the feature using a very realistic use case and non-trivial example code. There's also the video of Ed Burns and Roger Kitain's JavaOne 2013 JSF 2.2 talk on Parleys.com:
The source slide deck for the talk - titled JSF 2.2 New Features in Context is posted on theJavaOne Content Catalog. Make sure to check out the other great JavaOne 2013 sessions on Parleys.com too!