> So using Jaybird as a JCA connector is a safe matter.

At least from my point of view.

> What about the XA capabilities? An open issue in the wiki is "Fix the
> issues with XA protocol in JCA code".

I have mentioned the issue with XA in my post re. "in limbo" transactions.
There are also some changes re. the way Firebird connections/transactions
are handled, but that's internal stuf.

> In case in need distributed transactions inside a J2EE server, what is
> the best choice? Should I take care of something to prevent troubles?

Yes, just ensure that your container does not crash between prepare and
commit. The rest should work ok.

Roman