The version number would be the last thing I would worry about. I did some short tests with BoneCP. I can't say how stable it is when the DB or the network goes down. But it also didn't have any problems with it during my short tests. To my surprise it was noticeable slower than C3P0 in my real world benchmarks even though the homepage shows some very nice benchmarks results. Maybe my configuration was not perfect or maybe C3P0's statement caching works better (that makes quite a difference in my case).