Http status 404 -/the requested resource is not available

Question

I am new to java, I just tried to read initialization parameters from Deployment Descriptor file (web.xml), But got above error?

My web.xml and java file coding coding in snap attached.

My directrory structure is

c:\....tomcat\webapps\dd\web-inf\classes

No error in java class file.

Java file code which is compiled successfully

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

public class MyServlet2 extends HttpServlet { 

    String fileName; 
    public void init(ServletConfig config) throws ServletException {
        super.init(config); 
        fileName = config.getInitParameter("logfilename"); 
    } 

    protected void doGet(HttpServletRequest request,HttpServletResponse response)throws ServletException, IOException { 
         processRequest(request, response); 
    } 

    protected void doPost(HttpServletRequest request,HttpServletResponse response)throws ServletException, IOException { 
         processRequest(request, response); 
    } 

    protected void processRequest(HttpServletRequest request,HttpServletResponse 
response)throws ServletException, IOException { 
          PrintWriter out = response.getWriter(); 
          out.println(fileName); 
          out.close(); 
    } 
}

web.xml

<?xml version="1.0" encoding="ISO-8859-1"?> 
<web-app> 
    <servlet> 
    <servlet-name>MyServlet2</servlet-name> 
    <servlet-class>MyServlet2</servlet-class>
        <init-param>
            <param-name>logfilename</param-name>
            <param-value>value1</param-value> 
        </init-param>
    </servlet> 
    <servlet-mapping> 
        <servlet-name>MyServlet2</servlet-name> 
        <url-pattern>/mc11</url-pattern> 
    </servlet-mapping> 
</web-app>

Other detail of my directory and error page i think that my web.xml not working

In future, please show text *as text* rather than as screenshots. I'd also strongly advise you to investigate an editor other than notepad for writing both code and XML... — Jon Skeet, Jul 23 '15 at 08:06
Please get a proper IDE - it will make your life so much easier. Also can you edit your post so that the code shows properly (by prepending 4 spaces before each line). — M. Shaw, Jul 23 '15 at 09:57
Yes m shaw i edit my post again, i described above i m not good at java its just assignment that i have to submit i am working in vb.net with vs2013.please help me if you can? — Sonia Rehman, Jul 23 '15 at 10:08

Jon Skeet · Answer 1 · 2015-07-23T09:18:08.533

5

There are two problems I can see at the moment...

Servlet init parameters

You currently have:

//defining param1 param1 value1

That's not how you define the parameter. You should specify a param-name element containing the name of the parameter, rather than using the name of the parameter as an XML element name.

<init-param>
   <param-name>logfilename</param-name>
   <param-value>...</param-value>
</init-param>

Also note that // isn't how you write comments in XML - if you wanted a comment, you should have:

<!-- Define the first parameter -->
<init-param>
   <param-name>logfilename</param-name>
   <param-value>...</param-value>
</init-param>

(The param-value element should have been a hint - if you could really just specify your own element, I'd have expected <logfilename>value in here</logfilename> - having the name specified as an element name, but the value specified with a fixed element name of param-value would have been an odd scheme.)

Servlet mapping

Currently your mapping is:

<servlet-name> FormServlet</servlet-name>
    <url-pattern>/ss/</url-pattern>
</servlet-mapping>

I suspect that mapping won't match http://localhost:8080/dd/ss/s.html because you don't have any wildcards in there - it you may well find that it matches exactly http://localhost:8080/dd/ss/. It's not clear where the dd part comes in, but I assume that's a separate part of your configuration. You should try:

<!-- I would recommend removing the space from the servlet
   - name *everywhere*. -->
<servlet-name>FormServlet</servlet-name>
    <url-pattern>/ss/*</url-pattern>
</servlet-mapping>

If that doesn't work for http://localhost:8080/dd/ss/s.html, see whether it maps http://localhost:8080/ss/s.html - it may be that your engine isn't configured the way you expect elsewhere.

edited Jul 23 '15 at 09:18

answered Jul 23 '15 at 08:03

Jon Skeet

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logfilename I change it from web.xml file, also from java file, restart server but same error occurred? – Sonia Rehman Jul 23 '15 at 08:31
What do you mean by "also from java file"? Have you debugged into this at all? What URL are you requesting? – Jon Skeet Jul 23 '15 at 08:37
My url is http://localhost:8080/dd/ss. "also from java file" means that java class file after compile. My directrory structure is c:....tomcat\webapps\dd\web-inf\classes No error in java class file. Is there any problem between web-inf and WEB-INF which one correct? http://localhost:8080 work fine http://localhost:8080/dd/s.html work fine – Sonia Rehman Jul 23 '15 at 08:57
1

@SoniaRehman: Well /dd/s.html would go to an entirely different servlet. It looks like you haven't got the URL mapping right - I'll edit my answer. In the meantime, you should edit your question to have the text as text, not screenshots. – Jon Skeet Jul 23 '15 at 09:13
yes http://stackoverflow.com/users/22656/jon-skeet i edit my question with removing previous error, and directory structure dd is folder name, and dd/s.html is shows that server is on.I just test it," s.html is not part of my project its just for testing " – Sonia Rehman Jul 23 '15 at 10:13
@SoniaRehman: Now please edit the question again using the preview to check that it's formatted properly before you post... and bear in mind that XML *isn't* a Javascript snippet. You're now showing an entirely different URL mapping, which doesn't help... (And editing your question so that an existing answer doesn't make sense is generally unhelpful, btw...) – Jon Skeet Jul 23 '15 at 10:15
Let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/84061/discussion-between-sonia-rehman-and-jon-skeet). – Sonia Rehman Jul 23 '15 at 10:30

score 0 · Accepted Answer · answered Jul 25 '15 at 06:09

0

There is no problem with code,I try net beans tool and done assignment perfectly with the help of above code.Before that may be problem in tomcat.

answered Jul 25 '15 at 06:09

Sonia Rehman

95
3
12

Http status 404 -/the requested resource is not available

2 Answers2

Servlet init parameters

Servlet mapping