This is really an unfortunte side effect of every Rails AR adapter being a one-off piece of code. In JRuby, there's not much code different between the database

This is really an unfortunte side effect of every Rails AR adapter being a one-off piece of code. In JRuby, there's not much code different between the databases, but in Rails they're all completely different. That means we basically have to emulate N different codebases just to be compatible. If they settled on a common database layer, our job would be done. Write your congressman.