As described in the file README.SSO, you need not specify any credentials.
In order to set up the jTDS driver to use Windows Single Sign On, users will have to connect without providing a user name and password. This will only work on Windows.
Driver example:
// No user name or password in URL or as parameters
DriverManager.getConnection(
"jdbc:jtds:sqlserver://localhost:1433/LionKing");
You need not specify the useNTLMv2 parameter either, if you do it determines the version of NTLM that will be used, not IF NTLM will be used or not.