JPA is provided on Google AppEngine (GAE) via DataNucleus. DataNucleus data store used on GAE is BigTable. The solution has a few rough edges. See the references below for some of the docs from Google.
References
http://code.google.com/appengine/docs/java/overview.html
http://code.google.com/appengine/docs/java/datastore/overview.html
http://code.google.com/appengine/docs/java/datastore/jpa/overview.html
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