Hi,

I'm currently in the throes of replacing my in-house persistence layer with
JDO2, and I was wondering whether anyone out there can recommend a specific
open source JDO implementation.

I've been testing with one such implementation for the past couple of weeks,
but it seems to have problems with tracking detached object versions for
optimistic updates.  I guess I could trawl through the code and fix it, and
live with forked code while hoping the changes are accepted etc., but I
can't afford to spend too much time on it.  So I've decided to put it aside
and try out other JDO2 implementations -- so I'd appreciate any
recommendations.

If all else fails I may even try a (gasp) commercial implementation -- but
there again, how can I be sure it will be a good implementation, and how
quickly will bugs be fixed?

TIA,
Michael