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Can I use JPA 2.0(e.g EclipseLink) with Google App Engine?
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No, you can't use any implementation on GAE and they only support JPA 1.0. Quoting Using JPA with App Engine:
"Experimental" support for JPA 2.0 is now available in GAE.
You can find out how to set it up here.
Now, in version 1.7.1 of GAE SDK you can use JPA 2 or JDO 3, fully supported. See release notes. Or set up using this information.
The DataNucleus plugin to the Google AppEngine supports both the JDO and JPA API to access Google AppEngine Datastore infrastructure. Currently this implementation seems to support JPA1 only.