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POWhich java web framework to use for google app engine development in 2012?
 

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    <p>I am looking at developing simple java web-app to be deployed on GAE and learn about Java web development in the process. I am not inclined to use RIA component-based frameworks like Wicket and Vaadin. </p> <p>I have looked at Play 2.0, Tapestry 5 and Click, out of which Play 2.0 cannot be used on GAE (and I don't want to put efforts in learning Play 1.0 which is a thing of the past). I have no problem in using Javascript for client-side programming. So, I am not considering GWT.</p> <p>I have read up some documentation. Click seems to be easy to deploy on GAE. But, Tapestry 5 seems like a good framework to study and learn and become a better software/web developer. But, my google search for using Tapestry with GAE yielded pages that talked about hacks to get it working on GAE instead of having a first-class support for GAE itself. </p> <p>I do not mind putting in efforts to learn a complex framework if it is going to make me a better programmer. Does anyone have any experience with using Tapestry on GAE? Or should I just go for Click?</p>
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    1. COI wrote a GAE app in Scala, Scalatra, LiftJson, Objectify (ORM), Guice, and Specs2. This let me write Sinatra-style REST endpoints without a lot of complexity. The front-end was just a JS/PHP site on shared hosting. This avoided GAE costs for web traffic, let GAE do the heavy lifting, and was pretty snappy. Overall development was pretty painless.
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    2. CO@BenManes, thanks a lot for offering an interesting alternative. Scalatra looks great and well-documented, which is very important for a newbie like me. Since you used different packages, did you face any integration issues? What I am afraid of is running into some integration issues later.
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    3. COUI integration was easy since its just REST endpoints, so routes and json. That meant discovering bugs not found by tests and iterating on the api as the front-end was flushed out. For server-side I found GAE frustrating as not having friendly APIs (low-level, brittle, and not Java idiomatic). The maven/gradle plugins make releasing a breeze. Injection + mocks makes testing simple if you have an api/services/etc separation.
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