Unable to connect to MS SQL Server using jtds driver

Hi,

I am trying to connect to MS SQL server using jdbc driver.

e.g.

import groovy.sql.Sql

def sql = Sql.newInstance(DatabaseURL,'username', 'password', 'com.microsoft.jdbc.sqlserver.SQLServerDriver')

I have also tried

def sql = Sql.newInstance(DatabaseURL,'username', 'password', 'net.sourceforge.jtds.jdbc.Driver')

but I keep getting

for com.microsoft.jdbc.sqlserver.SQLServerDriver' :

2013-10-08 19:13:25,292 ERROR [errorlog] java.lang.ClassNotFoundException: com.microsoft.jdbc.sqlserver.SQLServerDriver
java.lang.ClassNotFoundException: com.microsoft.jdbc.sqlserver.SQLServerDriver

or for net.sourceforge.jtds.jdbc.Driver:

java.sql.SQLException: No suitable driver found for jdbc:jtds:sqlserver:

I recently upgraded to soapui 4.5.2 pro and net.sourceforge.jtds.jdbc.Driver was working in previous verison.

do I need to do anything different for 4.5.2? I have included jtds driver in my ext folder . For com.microsoft.jdbc.sqlserver.SQLServerDriver I read online that it ships with soapui.

Regards,
Adi