Test Form Data Model throwing error

[#1]

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.

[#2]

Looks like connection to DB is slow or breaking in between the call. Check SQL workbench if its able to execute the query

[#3]

SQL workbench is working fine. I executed insert, update, create queries. All executed fine. Getting this issue always, although I can see tables in AEM form data model. Issue is while testing get/insertservices.

[#4]

Try to insert same values as DATA model from workbench.