After fixing a few issues we managed to have an application working correctly, that you can see at http://gdsgae.appspot.com (log in with admin/admin or user/user). The application is relatively simple, but it demonstrates a complete integration between GraniteDS, Spring MVC and JDO/DataNucleus. The Eclipse project can be downloaded here.
Having a working environment in the local development server has been quite easy, but two bugs in the GAE production environment prevented GDS to work correctly. First there is a bug in XML/XPath support (GAE 1255) that we use for configuration parsing, and we had to add support for Xalan as an alternative XPath provider. Second there is a bug in request.getInputStream (GAE 1339) that throws EOFExceptions and that we could work around by buffering the stream in the AMF servlet.
So the first good news is that the latest GraniteDS 2.0 snapshot perfectly works in GAE if you add xalan.jar and serializer.jar (from the Apache Xalan distribution) in your WEB-INF/lib folder.
Then by pure coincidence we had been working lately on JDO and DataNucleus support in GDS (thanks a lot to Stephen More for his work on it) so it was natural to try it with the GAE datastore. The second good news is that GraniteDS fully supports JDO detached objects from GAE, and that all Tide features can work with JDO annotated entities (including lazy loading).
There seem to be a lot of bugs in the GAE persistence support though when not using Key objects as entity ids. So we have added the GAEKeyConverter that can serialize GAE keys to strings in ActionScript, and support can be configured in granite-config.xml with :
JDO annotated entities has also been implemented in the GDS Eclipse builder to generate AS3 classes from a JDO model and it works with the Google Eclipse plugin. If you also use Flex Builder, it's recommended to setup the order or the builders in the project properties as follows: Java, GraniteDS, Enhancer, Flex, GAE Project validator, GAE Webapp validator.
So we're happy to be able to add Google App Engine to the list of the Java platforms supported by GraniteDS, after Tomcat, Jetty, JBoss 4/5, GlassFish V2/V3 and WebLogic.