This week's book giveaways are in the iOS and Features new in Java 8 forums. We're giving away four copies each of Barcodes with iOS: Bringing together the digital and physical worlds and Core Java for the Impatient and have the authors on-line! See this thread and this one for details.
The main advantage is that JSF allows you to build GUI components for Web applications, while it could provide logic flow in connectionless environment. Of course, you need to pass in enough information so that JSF knows what to do.
Also, JSF provides event model so that each of the UI component could have its own handling method.
Detail could be refered to J2EE 1.4 tutorial, the JSF section.