2. What is the best(?) OS implementation of JDO that you know of?
Another hard question. You can try the RI from Sun used in OJB. Personally, I am waiting for the Apache OJB own implementation (Brian McCallister - currently working on it, thank Brian!). You can find some hints about some OS JDO implementation here:
There are some issues with the reference implementation. I found this one: http://marc.theaimsgroup.com/?l=xml-cocoon-users&m=108367741627573&w=4, but not the one I remember: When querying 20 objects out of a table with 5000 entries, for Sun' RI of JDO all 5000 objects are instantiated and the 20 are selected afterwards. That's an extreme performance killer and I switched to OJB's OTM instead of JDO. I heard much good news about the already mentioned TJDO: http://tjdo.sourceforge.net/.
Joerg
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