Using AJAX -- can't find servlet -- Error 404

Did that already. I'm trying everything because when I used JSF a method like getName would be called name in the JSP file, I still don't know why.

I've copying their code line for line and it won't work. I get the 404 status. But ithe server ready state is fine ( it equals 4 ).

My directory structure:

- Project Name

+ JavaSource

1. package

a. Responder.java

+ webcontent

1. JS

a. script1.js

2. Meta-INF

3. Web-INF

a. web.xml

4. login.html

for some reason there's a communication problem between my JS and my servlet class and I've spent the last couple of hours moving things, changin things and trying other similiar examples on the web. I continue to have the same problem.

ls6va at 2007-7-16 13:39:46 >

> Where is the servlet .class file under WEB-INF?

> Should be in

> n

> WEB-INF/classes/xml_Response_Servlet/Responder.class,

> right? YES, it is

>

> Your .java file should not be part of the web

> deployment.

>

> You did compile the .java file, didn't you? YES

>

> You didn't post your web.xml - maybe it's not

> correct.> Forgot

> What URL did you give to access the servlet?

> var url = "Responder?id=" + escape(idField.value);

>req.open("GET", url, true);> Are you deploying in a WAR file? You should be. NO just testing it in WSAD 5.0

>

> %

I was checking things in the web xml but I couldn't find anything to really change. I did come across the options:

Automatic Request Encoding and Automatic Response Encoding. I enabled both but nothing changed so I disabled them again.

Web XML:

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd">

<web-app id="WebApp">

<display-name>Dec_1_AJAX</display-name>

<servlet>

<servlet-name>Responder</servlet-name>

<display-name>Responder</display-name>

<servlet-class>xml_Response_Servlet.Responder</servlet-class>

</servlet>

<welcome-file-list>

<welcome-file>index.html</welcome-file>

<welcome-file>index.php</welcome-file>

<welcome-file>index.htm</welcome-file>

<welcome-file>index.jsp</welcome-file>

<welcome-file>default.html</welcome-file>

<welcome-file>default.htm</welcome-file>

<welcome-file>default.jsp</welcome-file>

</welcome-file-list>

<taglib>

<taglib-uri>http://jakarta.apache.org/taglibs/application-1.0</taglib-uri>

<taglib-location>/WEB-INF/lib/taglibs-application.jar</taglib-location>

</taglib>

<taglib>

<taglib-uri>http://jakarta.apache.org/taglibs/page-1.0</taglib-uri>

<taglib-location>/WEB-INF/lib/taglibs-page.jar</taglib-location>

</taglib>

<taglib>

<taglib-uri>http://jakarta.apache.org/taglibs/request-1.0</taglib-uri>

<taglib-location>/WEB-INF/lib/taglibs-request.jar</taglib-location>

</taglib>

<taglib>

<taglib-uri>http://jakarta.apache.org/taglibs/response-1.0</taglib-uri>

<taglib-location>/WEB-INF/lib/taglibs-response.jar</taglib-location>

</taglib>

<taglib>

<taglib-uri>http://jakarta.apache.org/taglibs/session-1.0</taglib-uri>

<taglib-location>/WEB-INF/lib/taglibs-session.jar</taglib-location>

</taglib>

<taglib>

<taglib-uri>jspsql</taglib-uri>

<taglib-location>/WEB-INF/lib/jspsql.jar</taglib-location>

</taglib>

<taglib>

<taglib-uri>http://jakarta.apache.org/taglibs/datetime-1.0</taglib-uri>

<taglib-location>/WEB-INF/lib/taglibs-datetime.jar</taglib-location>

</taglib>

<taglib>

<taglib-uri>http://jakarta.apache.org/taglibs/string-1.0.1</taglib-uri>

<taglib-location>/WEB-INF/lib/taglibs-string.jar</taglib-location>

</taglib>

<taglib>

<taglib-uri>http://jakarta.apache.org/taglibs/utility</taglib-uri>

<taglib-location>/WEB-INF/lib/utility.jar</taglib-location>

</taglib>

<taglib>

<taglib-uri>http://jakarta.apache.org/taglibs/mailer-1.1</taglib-uri>

<taglib-location>/WEB-INF/lib/taglibs-mailer.jar</taglib-location>

</taglib>

</web-app>

ls6va at 2007-7-16 13:39:46 >

> So where's the servlet-mapping in the web.xml?

>

> ><servlet-mapping>

> <servlet-name>Responder</servlet-name>

> <url-pattern>/Responder</url-pattern>

></servlet-mapping>

>

>

> %

.... thanks, I'm not familiar with making servlets. It finds the servlet but theres a problem with my JS logic because it always prints out that a valid user name was entered.

Thanks again, ls6v

ls6va at 2007-7-16 13:39:46 >

Got it! They had a typo or mistake in their Java class.

They put a "!" in a if condition but ti shouldn't be there. Once I removed it the program is working correctly. Thanks again for the servlet hlep.

The working code:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<HTML>

<HEAD>

<META http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">

<META name="GENERATOR" content="IBM WebSphere Studio">

<META http-equiv="Content-Style-Type" content="text/css">

<LINK href="theme/Master.css" rel="stylesheet"

type="text/css">

<TITLE>login.html</TITLE>

<script src="JS/XML_Script_1.js"></script>

</HEAD>

<BODY>

<input type="text"

size="20"

id="userid"

name="id"

onkeyup="validate();"/>

<div id="userIdMessage"></div>

</BODY>

</HTML>

JS

var req;

var message;

function validate()

{

var idField = document.getElementById("userid");

var url = "Responder?id=" + escape(idField.value);

if (window.XMLHttpRequest)

{

req = new XMLHttpRequest();

}

else if (window.ActiveXObject)

{

req = new ActiveXObject("Microsoft.XMLHTTP");

}

req.open("GET", url, true);

req.onreadystatechange = callback;

req.send(null);

}

function callback()

{

if (req.readyState == 4)

{

if (req.status == 200)

{

mdiv = document.getElementById("userIdMessage");

alert(req.responseXML.getElementsByTagName("message")[0].childNodes[0].nodeValue);

if (req.responseXML.getElementsByTagName("message")[0].childNodes[0].nodeValue == "invalid")

{

mdiv.innerHTML = "<div style=\"color:red\">Invalid User Id<>";

}

else

{

mdiv.innerHTML = "<div style=\"color:green\">Valid User Id<>";

}

}

else{alert("inner"+req.status)}

}

//else{alert("outer"+req.readyStat)}

}

//function parseMessage()

//{

//message = req.responseXML.getElementsByTagName("message")[0];

//setMessage(message.childNodes[0].nodeValue);

//}

JAVA servlet

package xml_Response_Servlet;

import java.util.HashMap;

import javax.servlet.Servlet;

import javax.servlet.ServletConfig;

import javax.servlet.ServletContext;

import javax.servlet.ServletException;

import javax.servlet.SingleThreadModel;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class Responder extends HttpServlet

{

private ServletContext context;

private HashMap users = new HashMap();

public void init(ServletConfig config) throws ServletException

{

this.context = config.getServletContext();

users.put("greg","account data");

users.put("duke","account data");

}

public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException

{

String targetId = request.getParameter("id");

try

{

if ((targetId != null) && users.containsKey(targetId.trim()))

{

response.setContentType("text/xml");

response.setHeader("Cache-Control", "no-cache");

response.getWriter().write("<message>valid</message>");

}

else

{

response.setContentType("text/xml");

response.setHeader("Cache-Control", "no-cache");

response.getWriter().write("<message>invalid</message>");

}

}

catch( Exception E)

{System.out.println("Error! "+ E.getMessage());}

}

}

ls6va at 2007-7-16 13:39:46 >