Problem loading jdbc driver in servlet, but not in program

I have two simple programs, one is a regular java program, the other
is a java servlet.
When I try to run the servlet, I get "Could not load database driver".
Any ideas on why this
happens?

-Keith

Here are the programs:

1. regular java program:

import java.io.*;
import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class DBPhoneLookup {
   public static void main (String args[]) throws
ClassNotFoundException, FileNotFoundException,  IOException,
SQLException {
       try {           Connection con = null;           Statement stmt = null;           ResultSet rs = null;           String url = "jdbc:postgresql:school";           String usr = "postgres";           String pwd = "postgres";
           // Load (and therefore register) the Postgres driver           Class.forName("postgresql.Driver");
           // Get a connection to the database           con = DriverManager.getConnection(url, usr, pwd);
           // Create a Statement object           stmt = con.createStatement();
           // Execute an SQL query, get a ResultSet           rs = stmt.executeQuery("Select first_name from students");
           // Display the result set as a list           while (rs.next()) {               System.out.println(rs.getString("first_name"));           }
           con.close();       }
       catch(ClassNotFoundException e) {           System.out.println("Could not load database driver: " +
e.getMessage());       }   }
}


2. servlet program:

import java.io.*;
import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class DBPhoneLookup   extends HttpServlet { public void doGet (HttpServletRequest req,
HttpServletResponse res) throws   ServletException, IOException {
       Connection con = null;       Statement stmt = null;       ResultSet rs = null;       res.setContentType("text/html");       PrintWriter out = res.getWriter();
       try {           String url = "jdbc:postgresql:school";           String usr = "postgres";           String pwd = "postgres";
           // Load (and therefore register) the Postgres driver           Class.forName("postgresql.Driver");
           // Get a connection to the database           con = DriverManager.getConnection(url, usr, pwd);
           // Create a Statement object           stmt = con.createStatement();
           // Execute an SQL query, get a ResultSet           rs = stmt.executeQuery("Select first_name from students");
           // Display the result set as a list           out.println("");           out.println("");           out.println("");           while (rs.next()) {               out.println("    " + rs.getString("first_name"));           }           out.println(" ");       }
       catch(ClassNotFoundException e) {           out.println("Could not load database driver: " +
e.getMessage()); }
       catch(SQLException e) {           out.println("SQLException caught: " + e.getMessage()); }
       finally {           // Always close the database connection           try { if (con != null) con.close(); }           catch (SQLException ignored) { }       }   }
}