I'm looking for a good conference to get an introduction to some java based web frameworks. Nothing needs to get incredibly in depth, just an introduction to a wide range of frameworks or their implementations.
Examples of stuff I'd like to learn more about:
Grails, RESTful web services, GWT, SOFEA, Struts,Spring,
Possibly some 'UI frameworks'/libs like YUI, jQuery, Prototype
Any ideas? Anything up and coming is preferred!