What JVM language + web framework do you use with Google Appengine Java?

Looking for the least bumpy (and most productive ) ride for a web 2.0 idea...

Groovy/Gr开发者_开发技巧ails, Scala/Lift, Groovy/Gaelyk, OR....

Please share your experience.

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I like the idea of using a predominantly google stack:

• eclipse ide with google plugins
• gwt + dispatch + presenter + gin + guice on the back end

I first saw this stack as appleguice,
I've also seen it used by hupa

I haven't used it yet, so I can't vouch for it being tried and tested,
but you should have a look at the video linked from the dispatch and presenter.

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I vote JRuby + Rails3

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I'm trying with Spring MVC + Groovy. It's just a REST application (without any html views, just a JSON and XML), and all is ok. But data access layer requires too much work :( My previous gae app was made using python+django, and it was more better.

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NetBeans 6.7 IDE with Google App Engine plugin and Apache Wicket.