> I think we can leave tx isolation as it is.

ok.

> For autocommit, we need to check that we are in a tx before calling
> commit() I think. We might need to also check no xa tx is in
> progress-- not sure.

sure, we have to check if we are in tx. also we have to throw
SQLException if we are in xa tx (that's what specs say). how this can
be achieved?

Ok, I will fix this issue in setAutoCommit(...) right now.

Regards,
Roman