Thanks a lot for this example. Seems jdbc driver is properly install, it finds the driver thanks to the Driver syntax you have given, I have no more error aubout jdbc driver.
I still get an error when trying to acces SQL server from the AIS Server, but I think it is now an issue about communication between servers, I sent it to my network team. Thanks again for your input that advanced me a step forward.
I will update the thread when I will actually connect, just to track solution to the end.