The next generation of DataNucleus AccessPlatform has now been
released. This includes much internal restructuring and API changes to
simplify future directions, as well as many feature additions,
including support for more datastore types. Of the things that impact
on GAE/J usage : non-tx persist/delete operations are now atomic, L2
cached is enabled by default, support for singleton PMF/EMF pattern,
preview for many JPA2 features, full support for JDO2.3 features, auto-
generation of primary key classes during enhancement, support for
persistence of JodaTime types, ability to cache query compilations and
query results, and many other things.

Obviously, the current version of the GAE/J DataNucleus plugin doesn't
support this version of DataNucleus yet, but if any of the items
listed above would be desirable to your project then I suggest that
you "star" the following issue
http://code.google.com/p/datanucleus-appengine/issues/detail?id=103&colspec=ID%20Stars%20Type%20Status%20Priority%20FoundIn%20TargetRelease%20Owner%20Summary
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