jclouds also has some support for Google App Engine, although I cannot
comment on its state.
Specifically, jclouds has a driver [1] that allows applications using
jclouds to run on GAE by ensuring things like threading and executor
management are done in a GAE-compliant way [2].
There are currently two very simply jclouds demo applications running
on GAE, for what it's worth:
http://jclouds-tweetstore.appspot.com/
http://jclouds-tweetstore-spring.appspot.com/
(both are running into some request timeouts at the time of writing
and need a bit of housekeeping)
Regards
ap
[1] https://github.com/jclouds/jclouds/blob/master/drivers/gae/pom.xml
[2]
https://github.com/jclouds/jclouds/blob/master/drivers/gae/src/main/java/org/jclouds/gae/config/GoogleAppEngineConfigurationModule.java
