I'm new to google appengine and java webprogramming (jsp/servlets/frameworks) (not to webprogramming or java). I was wondering if appengine supported java frameworks and, if so, which of them are recomandable? Are there any frameworks that support authentication?
Thanks
Here is a good list of different Java frameworks and if they can run on App Engine:
http://groups.google.com/group/google-appengine-java/web/will-it-play-in-app-engine
Gaelyk is a framework designed specifically to support applications written for the GAE. However it's not a Java framework, it's a Groovy framework. However, Groovy the language is almost a strict superset of Java, so if you know Java, you should find it very easy to learn. In fact, it's quite likely that if you use Gaelyk you can write most/all of your code in Java (though I wouldn't recommend this), because most Groovy libraries/framework work with either Groovy or Java code.
The Groovy Web Console is built using Gaelyk. It's an app that allows you to run Groovy code in a webpage.