I am using MySQL Workbench with AEM Forms in AEM 6.5.
After installing bundle mysql-connector-java-8.0.20.jar, able to fetch table in Form Data Model.
But when I try to test get/insert service, error message.

I am getting below error in erro.log:
11.05.2020 14:59:36.792 *ERROR* [0:0:0:0:0:0:0:1 [1589189376783] POST /content/dam/formsanddocuments-fdm/xyz/test.executeDermisQuery.json HTTP/1.1] com.adobe.aem.dermis.core.servlet.DermisBridgeServlet Encountered an error while executing operation
I would appreciate if someone shares the solution.