Database Access via a Servlet

Question

Hello
I have the following Servlet code:
package server;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.PrintWriter;
import java.io.BufferedReader;
import java.io.IOException;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Connection;
import java.sql.Statement;
import java.sql.SQLException;
import javax.sql.DataSource;
import javax.naming.InitialContext;
import javax.naming.NamingException;
public class ServletDB extends HttpServlet {
   private static String URL= "jdbc:microsoft:sqlserver://localhost:90;" +
     "DatabaseName=Filme;User=sa;Password=";     
  // GET handles the 'read' action
  protected void doGet(HttpServletRequest request,
                       HttpServletResponse response) throws IOException {
    PrintWriter out = response.getWriter();
    String action = request.getParameter("action");
    if (action == null) {
      out
        .println("You need to specify 'create' as the action parameter in GET.");
      return;
    if (action.equals("read")) {
      readDB(request, response, out);
    } else {
      out.println(action + " is not a valid action parameter.");
    return;
  public void doPost(HttpServletRequest request,
                     HttpServletResponse response) throws ServletException,
                     IOException {
    doGet(request, response);
  private void readDB(HttpServletRequest request,
                      HttpServletResponse response,
                      PrintWriter out) throws IOException {
    Statement stmt = null;
    ResultSet rs = null;
    Connection con = null;
    try {
      Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver").newInstance();
      con= DriverManager.getConnection(URL);       
      stmt = con.createStatement();
      rs = stmt.executeQuery("SELECT * FROM Voturi");
      // Read the data, a line at a time
      boolean hasEntries = false;
      while (rs.next()) {
        hasEntries = true;
        out.println(rs.getString("nume_film") + "," + rs.getString("nr_voturi")
                    + "," + rs.getString("an_de_productie"));
      if (!hasEntries) {
        out.println("database is empty");
      stmt.close();
      con.close();
    }catch (SQLException sqle) {
      out.println("Data not fetched. Check the stack trace!");
      sqle.printStackTrace();
    }catch (ClassNotFoundException cnfe) {
      cnfe.printStackTrace();
    }catch (InstantiationException instantiationException) {
      instantiationException.printStackTrace();
    }catch (IllegalAccessException illegalAccessException) {
      illegalAccessException.printStackTrace();
  // Get Servlet information
  public String getServletInfo() {
    return "server.ServletDB Information";
}When I run this servlet I get a blank page instead of the requested information and I can't figure why?My database connection part of this program works because I tried it with a J2SE application. I have just started working with servlets so the answer might be simple but I just can't see it.
Please help
Regards,
Michael

Answer 1

Hello jSweep.
Thank you for the reply.
I put the jar files in the lib directory and run the servlet again. I got the following message: 'Data not fetched. Check the stack trace!'. I have no clue how to check the stack trace. Please help if you know how.
Regards,
Michael