Apache Wicket

Igor Vaynberg has an Apache Wicket Cookbook over at packtpub.com

A bit price-y for an epub in that genre.

Wicket has some virtues: it was not near impossible to convert to non-HTML/non-XML web content markup (unlike Scala Lift which is, well, ahem.)

Okay Lift: they have no excuse for the XML-lockstep as they have something like Traits available in the Scala language.  Type of output should be orthogonal to HTTP forwarding, redirecting and the rest.  But Lift has a project leader first, and a framework second.  Scala itself has more promise.