Hi My initial testing with Google App Engine used JPA, JAX-RS, Google GSON, Google Closure Templates - elegant REST development, but it wasn't the quickest loading or serving app. Everything loosely coupled, lots of class path scanning, compiling of templates on the fly.
So I've ditched the frameworks and gone for all base APIs - direct streaming of XML (XMLStreamWriter) and JSON (streaming Jackson JsonGenerator). And using code generation (from an XML Schema, using Ant and currently XSLT 2.0 generator templates) to create speedy boilerplate code (hopefully) optimized for Google App Engine (no reflection, everything compiled and strongly typed). First page loading requests down to 1 - 2 seconds, rather than 10 seconds plus with framework overload. That's using the code generation to create some base AtomPub type model classes and streaming some very basic XML. It's actually quite refreshing to keep it simple. (Sure, even simpler would be to hard code even the boilerplate code, but this is aimed towards allowing me to quickly prototype support for a range of social type web protocols and feed types.) I wondered whether anyone else was looking into possible code generation for App Engine and Java? Which particular scenarios they felt it could be good to deliver? Which code generation tools? Andy
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