So far, the best documentation I have found is official at code.google.com/appengine . One useful JavaEE document is the HttpServlet Spec , as it is the main class for responding to HTTP requests in App Engine. There is a useful apache commons library for downloading files . Since you are not allowed to manipulate files on the server in gae, all your persistence will require some knowledge of the data warehouse, jdo and datanucleus enhancer .
In addition, you may want to use a third-party structure for more productive work. There are many products for various purposes. What application will you develop?
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