You can also give a try to Siena http://www.sienaproject.com
It provides the same level of features as Objectify just above Datastore.
But it's not specialized to GAE and aims at providing a bridge between NoSQL
DB (and also SQL DB when it's possible).
Currently we support GAE (sync/async) + MySQL/Postgres/H2.
We also provide high-level features around iteration, pagination (based on
cursors, forward & backward)...
We also recently added GAE entity groups and entity direct embedding
support.

SimpleDB is being coded right now and is already quite advanced!
Redis is under preparation.

regards
Pascal

PS: i'm lead dev of Siena, don't hesitate to contact me if you have
questions!

On Wed, Aug 3, 2011 at 12:04 AM, nischalshetty <[email protected]>wrote:

> I would recommend you to scrap JDO completely and use objectify. We were in
> a similar situation as you, changing over to objectify was the best thing
> ever! And it's easier than you could ever imagine.
>
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