The data source uses a driver jar file to connect to SQL Server. The driver jar needs to be compatible with the JRE version shipped with TDV.

The driver jar file that you are using with TDV 8.0 is likely to be built for JRE 8 (and not for JRE 11) and so it cannot be used to connect to the SQL Server.

Please do the following:

1.   Refer to the section titled Java and JDBC specification support on the Microsoft JDBC Driver for SQL Server support matrix page, and download a driver compatible with JRE 11.

For example, the screenshot below shows that the 8.4 and 8.1 drivers will work with JRE 11:
       

Based on this, we could choose to download Driver Version 8.4


     
2.  Replace the driver jar in the TDV installation with the new driver jar. For instance, if this is a SQL Server 2016 data source, replace the jar under the folder:
             <TDV_INSTALL>\conf\adapters\system\microsoft_sql_server_2016
with the new jar.



IMPORTANT: Make sure to extract the right driver jar. For instance, the above screenshot shows that the zip file contains three driver jars:

Of these, the correct jar is  mssql-jdbc-8.4.1.jre11.jar (the number ' 11' in the filename indicates that it is intended for JRE 11).

3.  If the driver jar is accompanied by a sqljdbc_auth<...>.dll file, copy the DLL to:
     <TDV_INSTALL>\apps\common\lib\win64



4.   Restart the TDV server.

5.   Test the data source to verify that it connects to the SQL Server database server.