//package classes;

i have used the code below,,and my application is working fine...but when i removed the comments from the package ling..the 404 error is coming..i have compiled the servlet with package line uncommented..whats the reason?
//package classes;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;
import java.io.*;
import java.sql.*;
public class CookieLoginServlet extends HttpServlet {
     public void doGet(HttpServletRequest request ,HttpServletResponse response)
     throws ServletException,IOException {
          sendLoginForm(response,false);
          System.out.println("inside get");
     public void doPost(HttpServletRequest request,HttpServletResponse response)
     throws ServletException ,IOException {
          String userName=request.getParameter("userName");
          String password=request.getParameter("password");
          if(login(userName,password)){
Cookie c1=new Cookie("userName",userName);
Cookie c2=new Cookie("password",password);
response.addCookie(c1);
response.addCookie(c2);
response.setContentType("text/html");
PrintWriter out =response.getWriter();
// response.sendRedirect does not work here.
// use a Meta tag to redirect to ContentServlet
out.println("<META HTTP-EQUIV=Refresh CONTENT=0;URL=ContentServlet>");
          }else{
               sendLoginForm(response,true);
     private void sendLoginForm(HttpServletResponse response,boolean withErrorMessage)
     throws ServletException ,IOException {
          response.setContentType("text/html");
          PrintWriter out=response.getWriter();
          out.println("<html>");
          out.println("<head>");
          out.println("<title>Login</title>");
          out.println("<body>");
          out.println("<center>");
          if(withErrorMessage){
               out.println("login failed .plz try again<br>");
               out.println("if u think you have entered the correct user name "+
                    "and password,the cookie setting in your browser might be off " +
                    "<br>Click<a href=InfoPage.html>here</a> for information ");
          out.println("<br>");
          out.println("<br><h2>please enter your username and password</h2>");
          out.println("<br>");
          out.println("<br><form method=POST>");
          out.println("<table>");
          out.println("<tr>");
          out.println("<td>userName:</td>");
          out.println("<td><input type=text name=userName></td>");
          out.println("</tr>");
          out.println("<tr>");
          out.println("<td>password:</td>");
          out.println("<td><input type=password name=password></td>");
          out.println("</tr>");
          out.println("<tr>");
          out.println("<td><input type=submit value=submit></td>");
          out.println("</table>");
          out.println("</form>");
          out.println("</center");
          out.println("</body>");
          out.println("</html>");
     public static boolean login(String userName,String password){
          try{
               Class.forName("sun.jdbdc.odbc.JdbcOdbcDriver");
               Connection con =DriverManager.getConnection("jdbc:odbc:JavaWeb");
               Statement s=con.createStatement();
               String sql="SELECT UserName FROM users" +
               "WHERE UserName='"+fixSqlFieldValue(userName)+ "'"+
               "AND password='"+fixSqlFieldValue(password)+"'";
               ResultSet rs= s.executeQuery(sql);
               if(rs.next()){
                    rs.close();
               s.close();
               return true;
               }else
               {     rs.close();
               s.close();
               con.close();
          }catch(ClassNotFoundException e){
               System.out.println(e.toString());
     catch (SQLException e) {
     System.out.println(e.toString());
     catch (Exception e) {
     System.out.println(e.toString());
     return false;
     public static String encodeHtmlTag(String tag){
          if(tag==null)
          return null;
          int length=tag.length();
          StringBuffer encodeTag=new StringBuffer(2*length);
          for(int i=0; i<length; i++) {
          char c=tag.charAt(i);
          if(c=='<')
          encodeTag.append("<");
          else if(c=='>')
          encodeTag.append(">");
          else if(c=='&')
          encodeTag.append("&");
          else if(c=='"')
          encodeTag.append(""");
          else if(c==' ')
          encodeTag.append(" ");
          else
          encodeTag.append(c);
          return encodeTag.toString();
     public static String fixSqlFieldValue(String value) {
          if (value==null)
          return null;
          int length = value.length();
          StringBuffer fixedValue = new StringBuffer((int) (length* 1.1));
          for(int i=0; i<length; i++) {
          char c = value.charAt(i);
          if(c=='\'')
          fixedValue.append("''");
          else
          fixedValue.append(c);
          return fixedValue.toString();
}

It means you didn't deploy the servlet properly.
Put the package back - all your Java classes should go into packages. All the time. The only exception is when you're writing a quick knock-off to test something that you'll run on the command line and rarely use again.
No surprise - the code you've written is certainly terrible. HTML to the output stream - ever heard of JSP?
SQL code in a servlet - ever hear of Data Access Objects?
Layering apps makes them easier to test, debug, maintain, and understand.
What servlet/JSP engine are you using? Tomcat? If so, Tomcat requires that you use packages.
Where did you put this beauty of a servlet? Better not be /ROOT. Create a directory under /webapps for your app and deploy it there.
What URL did you use to invoke the servlet? I'll bet that's wrong, too.
Lots to correct here.
%

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