web.xml servlet mapping not directing to servlet

**proksy** · 06-11-2012, 12:20 AM

Hi everyone. I am going through a login example which can be found here: JSP - Servlets: Full Login Example I created a simple main runner class to make sure I can connect to the database and all is good. The problem I am having is configuring my web.xml file to point to my LoginServlet file. I have tried more simple servlet tutorials and get them to work but I am hitting a wall on this one and was wondering if someone could give me a push in the right direction. I am able to navigate to my LoginPage.jsp file but when I hit the submit button I get the ol' apache tomcat 404 error: "The requested resource(/LoginServlet) is not available."

Here is the contents of my web.xml file:

Java Code:

<web-app>
  <servlet>
    <servlet-name>LoginServlet</servlet-name>
    <servlet-class>ExamplePackage.LoginServlet</servlet-class>
  </servlet>
  
  <servlet-mapping>
    <servlet-name>LoginServlet</servlet-name>
    <url-pattern>/LoginPage</url-pattern>
    <url-pattern>/UserLogged</url-pattern>
    <url-pattern>/InvalidLogin</url-pattern>
  </servlet-mapping>
</web-app>

I'm deffinately doing something wrong with this. Thanks for the help!

**Tolls** · 06-11-2012, 11:06 AM

What are you putting into the browser for a URL?

**proksy** · 06-21-2012, 05:32 PM

sorry everyone I've been swamped with work for a new job and have been out of state for a while and now I'm back....here is what I put into the url --> localhost/LoginPage.jsp and it loads just fine but when I hit submit it then gives me the 404 error

I know the tutorial had me create a folder named LoginExample but when I navigated to --> localhost/LoginExample/LoginPage.jsp and clicked submit I got the same error so I tried moving it to my ROOT folder. In hindsight it seems pointless and noobish to do that...anyways, when I navigate to LoginPage.jsp it loads correctly but when I click the submit button I recieve the 404 error..thanks Tolls

**Tolls** · 06-21-2012, 05:53 PM

So it's not that JSP causing the problem then, but whatever thje submit is referencing.

**wsaryada** · 06-21-2012, 05:55 PM

The error said that it cannot find a resource named "/LoginServlet". I saw that you have a servlet called LoginServlet, but this servlet is not mapped to the url pattern of "/LoginServlet". Instead this servlet was registered to be accessed with a url pattern such as "/LoginPage", "/UserLogged", or "/InvalidLogin".

This mean you should change the action attribute of your login page to point one of this registered url pattern to access the LoginServlet.

**proksy** · 06-21-2012, 08:20 PM

I've reworked the tutorial again and realized I goofed up. Here is what I have in my web.xml file

Java Code:

<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
	<display-name>LoginExample</display-name>
	<servlet>
		<description>
		</description>
		<display-name>LoginServlet</display-name>
		<servlet-name>LoginServlet</servlet-name>
		<servlet-class>
		ExamplePackage.LoginServlet</servlet-class>
	</servlet>
	<servlet-mapping>
		<servlet-name>LoginServlet</servlet-name>
		<url-pattern>/LoginServlet</url-pattern>
	</servlet-mapping>
	<welcome-file-list>
		<welcome-file>LoginPage.jsp</welcome-file>
	</welcome-file-list>
</web-app>

This is what I have in my action for my form or button

Java Code:

<%@ page language="java" contentType="text/html;
 charset=windows-1256" pageEncoding="windows-1256" %> 
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" 
"http://www.w3.org/TR/html4/loose.dtd"> 
<html> 
	<head> 
		<meta http-equiv="Content-Type" content="text/html;
 		charset=windows-1256"> 
		<title>Login Page</title> 
	</head> 
	<body> 
		<form action="LoginServlet"> 
			Please enter your username <input type="text" name="un"/><br> 				
			Please enter your password <input type="text" name="pw"/> 
			<input type="submit" value="submit"> 
		</form> 
	</body> 
</html>

Sense I'm not calling anything I didn't think I needed an import statement...seems like I have it right now but I still get the 404 error for some reason. I've got a Java EE book coming to me so that should help me figure this stuff out too. My form action="LoginServlet" seems to be where the problem lies. I think you all are right. Thanks for the help!

**proksy** · 06-21-2012, 11:34 PM

Java Web Programming with Eclipse this online book got me going. I honestly don't like IDE templates like the ones eclipse uses because if I follow a tutorial that relies heavily on them, I don't get to know how EVERYTHING works. Thanks for the input and the help. My problem seems to be solved ;) Highly recommend this free online book.