The Microsoft JDBC driver is called sqljdbc_xa.dll, so your problem is most likely to be with any JDBC driver supplied with Websphere.
The most likely problem is that your sqljdbc.dll file is not in the correct folder, so it is not visible to SQL Server. The dll needs to be in the \binn folder for the instance of SQL Server that is running.
Original author: https://github.com/SQL-FineBuild/Common/wiki/ 1-click install and best practice configuration of SQL Server 2019, 2017 2016, 2014, 2012, 2008 R2, 2008 and 2005.
When I give food to the poor they call me a saint. When I ask why they are poor they call me a communist - Archbishop Hélder Câmara