Java extension error after ARIS 10.0.16 upgrade

I have developed an java extension (.jar file) 2 years before, this java application are stored in the past on the folder ..\LOCALSERVER\jre\lib\ext  and its work fine.

But after the installation of ARIS server 10.0.16 and i have copied the same java executable (compiled  with JDK1.8) in ..\LOCALSERVER\jre8\lib\ext

But now I have an error on the line

var classimp = new Packages.caat.CAATConnector();

Do you have any idea to correct the problem ?

Thanks for your help