Hi Franklin
To my mind is not possible to have the Tasks in a transactional scope. Neither if you are using the Mina Server nor if your using the TaskSession directly. The libraries are written for J2SE with local (manual) transactions, we could integrate it successfully in an app server by the use of <no-tx-datasources>. And: they are not transactional... please refer to the findings of a collegue of mine. If you are using the Mina Server you will be responsible to do a rollback manually :|
If you find a solution to that problem, I would be grateful if you could post it here...
Regards
Daniele