Feedback about the creation of an application on Google App Engine

Goal : Create a small alert's application on Google App Engine and evaluate the easiest method.
Here is my small feedback :

Test 1 : Create a small project with GWT

Drawback

1) Installation
- Netbeans : Not working for me.Installation problem with plugin ...
- Intellij : I didn't find any plugin
- Eclipse : OK and it's easy

2) Create his own application

I want to made a small application but in my mind, GWt is too complex and not quick
Here is an example : see https://github.com/drieu/gwtalert).

Advantage

Quick deploy on Google App Engine facile.

- Test 2 : Create a project with Play 1.2.5 and GAE plugin.

Advantage 

Easy to develop because of framework Play.

Drawback

- I've some difficulties with my proxy
Here is the Play application with solution  https://github.com/drieu/PlayWithGoogleAppEngine

- Play 1.2.5 isn't maintain.See if Yalp will work ...