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unable to run servlets

 
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hi,
i am not able to run servlet..i am able to compile them but
when i run it in explorer i get error 404...
please help....

Thanks in advance
Anubha.
 
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Welcome to JavaRanch!

In an effort to help you get the most from our forums, we've compiled a
list of tips for asking questions here. You can find the list in our
FAQ section here.
In particular please see:
TellTheDetails

In particular we would need to see:
  • You servelet declaration (in web.xml)
  • Your servlet mapping (also in web.xml)
  • The URL that you're using (either in your browser's address window, your hyperlink's href attribute or your form's action attribute)

  • And anything else you think might help someone solve this problem.
    Again, welcome to JavaRanch and good luck with your question.
    -Ben
     
    Rancher
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    Where is the servlet class file located? Which URL are you trying to access? How is the servlet mapped in the web.xml file - post the servlet and servlet-mapping elements.
     
    anubha goel
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    hii,
    my web.xml file is:

    <?xml version="1.0" encoding="ISO-8859-1" ?>
    <!DOCTYPE web-app (View Source for full doctype...)>
    <web-app>
    <servlet>
    <servlet-name>colour</servlet-name>
    <servlet-class>colour</servlet-class>
    </servlet>
    <servlet-mapping>
    <servlet-name>colour</servlet-name>
    <url-pattern>servlet/colour</url-pattern>
    </servlet-mapping>
    </web-app>
    -------------------
    i hav placed my class file in: C:\apache-tomcat-5.5.23\webapps\anu\WEB-INF\classes\colour

    -----------------------
    i am trying to access my servlet through following URL:
    http://localhost:8080/anu/col.html
    -------------------------------
    my java servlet is :
    COLOUR.JAVA

    import java.io.*;
    import javax.servlet.*;
    import javax.servlet.http.*;
    public class colour extends HttpServlet
    {
    public void service(HttpServletRequest rq,HttpServletResponse rs)throws ServletException, IOException
    {
    PrintWriter out=rs.getWriter();
    String s=rq.getParameter("colour");
    out.println("<body bgcolor="+s+"><H1><font color=red>this is get parameter example</font></H1></body>");
    out.close();
    }
    }
    -----------------------
    my html file is:
    COL.HTML

    <form action="http://localhost:8080/anu/colour" method="Post">
    name of color<input type=text name=color><BR>
    <input type=submit value=set>
    </form>

    Thanks And Regards,
    Anubha.
     
    Ulf Dittmer
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    <url-pattern>servlet/colour</url-pattern>


    That should be

    <url-pattern>colour</url-pattern>



    Also, the class file should be in "C:\apache-tomcat-5.5.23\webapps\anu\WEB-INF\classes", not in "C:\apache-tomcat-5.5.23\webapps\anu\WEB-INF\classes\colour".
     
    Ranch Hand
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    Mac MySQL Database Tomcat Server
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  • Check the url-pattern you have configured in web.xml is different than that of what you access at runtime. Make sure they both are same.
  • The class what you have specified is of default package. Be careful in that case where your actual .class files reside. Have a look at that as well.


  • [ July 30, 2007: Message edited by: Raghavan Muthu ]
     
    anubha goel
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    Hi,
    i made all the changes but still getting the same error-404....i am too buged up..
    please help...

    Thanks and Regards,
    Anubha.
    [ July 30, 2007: Message edited by: anubha goel ]
     
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    <servlet-class>colour</servlet-class>



    ALL java classes used in servlets should be in a package and located under \classes using the package name. Failure to do so results in exactly what you are seeing - the servlet container has its own idea of what the "current" directory is.

    Bill
     
    Raghavan Muthu
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    Yeah, thats correct as william Brodgen said.

    Its always better to keep your files in some specific packages rather than leaving it to the default packages!

    Thanks for pointing out Bill.
     
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    Hi anu,

    See this web.xml

    <?xml version="1.0" encoding="ISO-8859-1" ?>
    <!DOCTYPE web-app
    PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
    "http://java.sun.com/dtds/web-app_2_3.dtd">

    <web-app>
    <servlet>
    <servlet-name>colour</servlet-name>
    <servlet-class>colour</servlet-class>
    </servlet>
    <servlet-mapping>
    <servlet-name>colour</servlet-name>
    <url-pattern>/colour</url-pattern>
    </servlet-mapping>
    </web-app>


    You hould start the url pattern with a / unless its something like

    so it should be /colour and not just color

    Some other suggestions ( These are not causing any problems but just some suggestions)

    -> In the html the action can be just colour and you need not put the whole
    path.

    -> I would suggest you to use use camel case for the class name.
    keep it Colour and not color.

    -> Make sure web.xml is in <webapp>/WEB-INF and class file in
    <webapp>/WEB-INF/classes

    everything else looks fine. I think adding a / in the
    <url-pattern>/colour</url-pattern> tag should be ok.

    Amol..
     
    anubha goel
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    hii,
    i tried all solutions but nothing is working...
    can somone telme an example so that i can try to run that on my system...
    it mite be helpful...

    Thanks & Regards,
    Anubha.
     
    Amol Nayak
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    Hi anu.

    Thats strange, do one thing can you mail me the zip of the files you are using. Let me go through it and see whats goin wrong..

    mail to amolnayak311@gmail.com..

    Amol..
     
    Ben Souther
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    Originally posted by anubha goel:
    hii,
    i tried all solutions but nothing is working...
    can somone telme an example so that i can try to run that on my system...
    it mite be helpful...

    Thanks & Regards,
    Anubha.



    There is a very simple "hello, world" servlet on my site.
    Look for Simple Servlet.
    http://simple.souther.us
     
    anubha goel
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    Hi,
    thanks a lot all of you and specially Amol.
    my servlet is running successfully now.

    Thanks & Regards,
    Anubha.
     
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    Originally posted by Amol Nayak:
    mail to amolnayak311@gmail.com..



    Amol, in the future please do not take the conversation out of the forums. Please read this for more information.
     
    Ben Souther
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    Originally posted by anubha goel:
    Hi,
    thanks a lot all of you and specially Amol.
    my servlet is running successfully now.

    Thanks & Regards,
    Anubha.



    What was it?
     
    Amol Nayak
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    Bear, i am aware of it.. I told her to mail me the files so that i can take a look at it.

    It was the problem with web.xml file.. I have already posted the web.xml she needs to use..
     
    anubha goel
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    Hi,
    i am really very sorry if i prohibited any rules...

    Thanks & Regards,
    Anubha.
     
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    Hi there,

    I gained alot from this post, especially that I suffered similar problems many times. I have a final question though, assuming that the servlet classes reside in the default package, or folder, "classes/", what are the urls that correspond to the following mappings, particularly when trying to invoke either servlet through a relative url:



    and


    Thank you very much in advance
    Hatim
     
    Bear Bibeault
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    assuming that the servlet classes reside in the default package



    Such a practice is strongly discouraged.
     
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