> 1). I can't seem to get "!=" working either.

I have no such problems with JDOQL, but then you're using it in GAE/J
with an old version of DataNucleus.


> 2) If I have mapped my objects using JPA annotations, will the query
> engine default to JDOQL vs JPQL?

The type of metadata specification ... JDO XML, JDO Annotations, JPA
XML, JPA Annotations ... has nothing to do with the persistence API
being used (in DataNucleus). If you create a PMF then you use JDO API,
if you create an EMF then you use JPA API. JPA API only allows JPQL
queries (you can't use JDOQL). JDO API allows JDOQL or JPQL queries,
using the API to define what you're using; see the JDO javadocs.
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