Google App Engine的框架选择/建议

i want to develop a big web application in Google App engine, but I don't know which framework to use in order to obtain the MVC Model. I prefer to use Spring MVC, but I read that several problems with GAE. Another option would be to use django with python but I have never used that. What framework or option do you recommend? Are there other frameworks?i want to develop a big web application in Goog