A REST XML (not JSON!) Web Service should exchange XML Schema specified XML between a Google App Engine and an Android app.
I wanted to use XStream for both, however, I could not get it to work for the Google App Engine, therefore to me Apache XMLBeans is the next best choice (JAXB does not work on both). However, with Google App Engine there is no problem, but on Android, I get several severe exceptions (eg. due to the usage of the Stax API with its javax.xml.* packages).
So,
Thanks!
I'm poking in the dark here, since i haven't tried anything of this, yet:
There's this blog entry from XBinder which claims that they are releasing an android-compatible version "in a few weeks". While that might not be an option right now, they also explain a bit of how they have done it, wrapping a light StAX-like wrapper on the XmlPull support already present in Android.
(my answer originally had another paragraph on XStream working on android, but then i read the question again and saw that your problem was with getting XStream to work on the AppEngine side...)
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