Helllo Partheeban,
This could be because you may be using Driver 4.0 with SQL 2000.
According to Microsoft's website, JDBC Driver 4.0 driver supports connections to SQL Server 2005 and above.
Try downloading Driver 3.0.
http://www.microsoft.com/en-in/download/details.aspx?id=21599 .
Choose to download the one with .tar.gz as extension. Extract it. you can try with sqljdbc.jar. It should work out.
Make sure to delete & deploy the already present driver before uploading the new one.
Regards
Tufale Ashai
