Getting exception in Servlet due to ODBC

I am getting exception which is as follow -

Exception[Microsoft][ODBC Driver Manager] Data source name not found and no default driver specifiedjava.sql.SQLException: [Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified

This is exception is coming when I am trying to login from by JSP page and my Login.java file contain following code I already created the DSN by name ITMNGMNT

public void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException 
    {
        Connection c=null;
        String loginid=request.getParameter("loginid");
        String pswd=request.getParameter("pswd");
    response.setContentType("text/html");
    HttpSession session=request.getSession(true);
        PrintWriter out = response.getWriter();
    try{
            Class.forName(getContext("Driver"));
            c= DriverManager.getConnection(getContext("Url"),getContext("User"),getContext("Password"));
        Statement st =c.createStatement();
            String query = new String("select * from Customer where loginid='" +loginid+ "' and pswd='"+pswd+"'"); 
            System.out.println("Query :"+query);
            ResultSet rs= st.executeQuery(query);
            if(rs.next()){
        session.setAttribute("Member",loginid);
        response.sendRedirect("index.jsp");
            } else { 
        request.setAttribute("Response","Invalid User name and password");
        getServletContext().getNamedDispatcher("member").forward(request,response);
            }
           }
            catch(Exception e){
                out.println("Exception"+e.getMessage()+e.toString());
            }....

My WEB_INF contain following instructions -

...
<web-app>
<context-param>
    <param-name>Driver</param-name>
    <param-value>sun.jdbc.odbc.JdbcOdbcDriver</param-value>
</context-param>
<context-param>
    <param-name>Url</param-name>
    <param-value>jdbc:odbc:ITMNGMNT</param-value>
</context-param>
<context-param>
    <param-name>User</param-name>
    <param-value>grandtour</param-value>
</context-param>
<context-param>
    <param-name>Password</param-name>
    <param-value>grandtour</param-value>
</context-param>
<servlet>
    <servlet-name>UserLogin</servlet-name>
    <servlet-class>Login</servlet-class>
  </servlet>

  <servlet-mapping>
    <servlet-name>UserLogin</servlet-name>
    <url-pattern>/login</url-pattern>
  </servlet-mapping>
  <servlet>
    <servlet-name>member</servlet-name>
    <jsp-file>/Pages/Login.jsp</jsp-file>
  </servlet>

  <servlet-mapping>
    <servlet-name>member</servlet-name>
    <url-pattern>/members</url-pattern>
  </servlet-mapping> ...