java.sql.SqlException

I am using the SQL2008R2 and Connect to Tomcat4 

java.sql.SQLException: Unable to get information from SQL Server: Localhost.

        at net.sourceforge.jtds.jdbc.MSSqlServerInfo.<init>(MSSqlServerInfo.java:91)
        at net.sourceforge.jtds.jdbc.ConnectionJDBC2.<init>(ConnectionJDBC2.java:263)
        at net.sourceforge.jtds.jdbc.ConnectionJDBC3.<init>(ConnectionJDBC3.java:50)
        at net.sourceforge.jtds.jdbc.Driver.connect(Driver.java:178)
        at java.sql.DriverManager.getConnection(DriverManager.java:664)
        at java.sql.DriverManager.getConnection(DriverManager.java:247)
        at com.javaexchange.dbConnectionBroker.ConnectionPool.createInstance(ConnectionPool.java:485)
        at com.javaexchange.dbConnectionBroker.ConnectionPool.refresh(ConnectionPool.java:456)
        at com.javaexchange.dbConnectionBroker.ConnectionPool.run(ConnectionPool.java:630)

---------java extension path-----------

<init-param>
      <param-name>db_server</param-name>
 <!--      <param-value>jdbc:jtds:sqlserver://220.220.220.141:1444/BIRGUNJ;instance=sql2008</param-value>   --> 
  <!--  <param-value>jdbc:jtds:sqlserver://220.220.220.141:1444/TEST;instance=sql2008</param-value>    -->
  <param-value>jdbc:jtds:sqlserver://Localhost:1444/TEST_DATA;instance=SQL2008R2</param-value>
 </init-param>

    <init-param>
      <param-name>alternet_db_server</param-name>
      <param-value>jdbc:jtds:sqlserver://220.220.220.233:1444/WB-DHAKURIA;instance=SQL2008R2</param-value>
    </init-param>