> So, how can I configure App Engine to use my existing JPA backend on a 
> Postgresql database?

You can't. The datastore on GAE/J is BigTable.

As for "isInProximity" you need to define your problem, because
obviously there is something in your class and we can't see it.

The Google docs don't dictate anything. They say you have JDO, JPA or
low level API. JDO is most tested, since is most appropriate for this
type of datastore.
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