Problems with my first Servlet

Hello,
I'm using tomcat 5 and Java SDK 5.0
I have compiled a Java class called HelloServlet.class, which is in the package foo/bar.
Now I have copied the class to the tomcat directory \webapps\servlets-examples\WEB-INF\classes.
According to my book it should work now, but it doesn't.
under http://localhost:8080/servlets-examples/fo/bar/HelloServlet I get an Error Message HTTP-Status 404
What could I did wrong?

Have you made an entry for the your servlet in the web.xml of Examples?
you would have to include something like:
<servlet>
<servlet-name>HelloServlet</servlet-name>
<servlet-class>foo.bar.HelloServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>HelloServlet</servlet-name>
<url-pattern>/foo/bar/HelloServlet</url-pattern>
</servlet-mapping>

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<html>
<head>
<meta http-equiv='Content-Type' content='text/html; charset=utf-8'>
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<link rel='STYLESHEET' type='text/css' href='encrypt.css'>
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</select>
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         <input type='file' name='covert' size='20'>
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</form>
</center>
</body>
</html>so it works for me even if i access the page with my ip , but for others it doesnt work,
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import java.io.*;
import java.util.*;
import javax.servlet.ServletException;
import javax.servlet.http.*;
import org.apache.commons.fileupload.*;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
public class temp2 extends HttpServlet
    FileInputStream fin;
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    String keyfile,IVfile;
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    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
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        f = (FileItem)x.next();
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            System.exit(0);
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                    if(check==-1)
                        System.out.println(f.getName());
                        System.out.println("Unsupported browser : " + check);
                        System.exit(0);
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                    names[i] = ff.getName(); // original file names
                    try
                        f.write(ff);
                        filenames[i] = ff.getAbsolutePath();
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                        ff.deleteOnExit();
                    }catch(Exception e) {System.out.println("Error writing file"+ ff.getAbsolutePath()); System.exit(0);}
                    i++;
                try { System.in.read(); } catch(Exception e) {}
            }// endwhile
            if(fieldval.equalsIgnoreCase("DES"))
                System.out.println("DES 1"+filenames[1]);
                javades o = new javades(filenames[1]); // the file to be encrypted
                filenames[1] = "e:\\apache\\webapps\\temp\\files\\" + names[1];
                System.out.println("should be original" + filenames[1]);
            else if(fieldval.equalsIgnoreCase("Tripple DES"))
                javatdes o = new javatdes(filenames[1]);
                filenames[1] = "e:\\apache\\webapps\\temp\\files\\" + names[1];
                System.out.println(filenames[1]);
            System.out.println("Calling stego");
            filenames[0] = "e:\\apache\\webapps\\temp\\" + names[0];
            System.out.println("file 1 "+ filenames[0]);
            System.out.println("file 2"+ filenames[1]);
            try { System.in.read(); } catch(Exception e) {}
            stego s = new stego(filenames[0],filenames[1]);
            System.out.println("mainext " + s.mainext);
            // encryption done, and new files are loaded, now lets hide
            if(s.mainext.equalsIgnoreCase("wav"))
                s.encodewav();
                System.out.println("Encoded wave");
            else if(s.mainext.equalsIgnoreCase("bmp"))
                System.out.println("Encoded bmp");
                s.encodebmp();
            System.out.println("done !");
            PrintWriter pr = response.getWriter();
            pr.println("Greetings , Your work is done and saved, now download the following files");
            pr.println("The secret key file is needed for getting back your hidden file, so download that too");
            pr.write("<a href=\"/temp/files/IV.txt\">click here</a>");
            pr.write("<br/><a href=\"/temp/files/key.txt\">click here</a>");
            pr.write("<br/><a href=\"/temp/files/"+names[0]+"\">click here</a>");
            return;
        // if it is decryption case
        else if(eord.equalsIgnoreCase("d"))
            while(x.hasNext())
                f = (FileItem)x.next();
                if(!f.isFormField())
                    int check = f.getName().lastIndexOf(File.separator);
                    System.out.println(File.separator);
                    if(check==-1)
                        System.out.println(f.getName());
                        System.out.println("Unsupported browser : " + check);
                        System.exit(0);
                    File ff = new File("e:\\apache\\webapps\\temp\\"+f.getName().substring(check));
// else if ladder to store paths of stegofile keyfile and IVfile
                    if(f.getFieldName().equalsIgnoreCase("stegofile"))
                        filenames[0] = ff.getAbsolutePath();
                    else if(f.getFieldName().equalsIgnoreCase("keyfile"))
                        keyfile = ff.getAbsolutePath();
                    else if(f.getFieldName().equalsIgnoreCase("IVfile"))
                        IVfile = ff.getAbsolutePath();
                    try
                        f.write(ff); // writes whole file at once
                    }catch(Exception e) {System.out.println("Error writing file"); System.exit(0);}
            }// endwhile
            System.out.println("Calling stego");
            System.out.println("file 1 "+ filenames[0]);
            stego s = new stego(filenames[0]);
            System.out.println("mainext " + s.mainext);
            if(s.mainext.equalsIgnoreCase("wav"))
                s.decodewav();
                System.out.println("Encoded wave");
            else if(s.mainext.equalsIgnoreCase("bmp"))
                s.decodebmp();
                System.out.println("Encoded bmp");
            System.out.println("done !");
            ////// hidden file has been retrieved , now lets decrypt it
            System.out.println("ext " + s.ext);
            filenames[0] = "e:\\apache\\webapps\\temp\\"+s.filename;
            System.out.println(filenames[0]);
            System.out.println(keyfile);
            System.out.println(IVfile);
            if(fieldval.equalsIgnoreCase("DES"))
                javades o = new javades(filenames[0],keyfile,IVfile); // the file to be encrypted
                filenames[0] = "e:\\apache\\webapps\\temp\\" + ( new File(filenames[0]).getName());
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            pr.write("Greetings, you have successfully retrieved your hidden file, now download it from here <br>");
            pr.write("<a href=\"http://localhost:8080/temp/files/" + (new File(filenames[0]).getName())+"\">Click here</a>");
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<?xml version="1.0" encoding="UTF-8"?>
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<li>If you are unable to load any pages, check your computer's network
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<ul>
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<li>The site could be temporarily unavailable or too busy. Try again in a few
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<li>If your computer or network is protected by a firewall or proxy, make sure
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    SYSTEM "chrome://global/locale/global.dtd">
%globalDTD;
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<html xmlns="http://www.w3.org/1999/xhtml">
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          errTitle.id = "errorTitleText";
        var sd = document.getElementById("errorShortDescText");
        if (sd)
          sd.textContent = getDescription();
        var ld = document.getElementById("errorLongDesc");
        if (ld)
          ld.parentNode.replaceChild(errDesc, ld);
          // change id to the replaced child's id so styling works
          errDesc.id = "errorLongDesc";
        // remove undisplayed errors to avoid bug 39098
        var errContainer = document.getElementById("errorContainer");
        errContainer.parentNode.removeChild(errContainer);
    ]]></script>
</head>
<body dir="ltr">
    
    
    <div id="errorPageContainer">
      
      <div id="errorTitle">
        <h1 id="errorTitleText">The connection was reset</h1>
      </div>
      
      <div id="errorLongContent">
        
        <div id="errorShortDesc">
          <p id="errorShortDescText">The connection to the server was reset while the page was loading.</p>
        </div>
        
        <div id="errorLongDesc">
<ul>
<li>The site could be temporarily unavailable or too busy. Try again in a few
    moments.</li>
<li>If you are unable to load any pages, check your computer's network
    connection.</li>
<li>If your computer or network is protected by a firewall or proxy, make sure
    that Firefox is permitted to access the Web.</li>
</ul>
</div>
      </div>
      
      <xul:button xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul" id="errorTryAgain" label="Try Again" oncommand="retryThis();"/>
    </div>
    
    <script type="application/x-javascript">initPage();</script>
</body>
</html>thank you for your prompt reply in advance,
Regards,
Mihir Pandya

Hi, thank you for your replies, I found out few things about my servlet, and its portability
and i have few questions, although i marked this topic as answered i guess its ok to post
I am using javax.servlet.context.tempdir to store my files in that servletcontext temporary directory. But i dont know how to give hyperlink
of the modified files to the user for them to download the modified files.
What i am using to get the tempdir i will paste
File baseurl = (File)this.getServletContext().getAttribute("javax.servlet.context.tempdir");
System.out.println(baseurl);
baseurl = new File(baseurl.getAbsolutePath()+File.separator+"temp"+File.separator+"files");
baseurl.mkdirs();so i am storing my files in that temp/files folder and the servlet processes them and modifies them, then how to present them as
links to the user for download ?
and as the servlet is multithreaded by nature, if my servlet gets 2 different requests with same file names, i guess one of them will be overwritten
And i want to create unique directory for each request made to the servlet , so file names dont clash.
one another thing is that i want my servlet to be executed by my <form action> only, I dont want the user to simply type url and trigger the servlet
Reply A.S.A.P. please..
Thanks and regards,
Mihir Pandya

Hi, I'm having a problem with my first gen. iPad switching back to the apps page by itself. This started after upgrading to ios5. It will do this from safari or kindle. I have turned it off manually as suggested by a tech rep. without any improvement.

Hi,
My 1stgen iPad keeps. Switching back to the apps. Pages by itself after installing ios5. I have shut it down manually as suggestedby a tech rep but the problem still exists.
Thanks, Jim

1) This is because of software version 1.1. See this
thread for some options as to how to go back to 1.0,
which will correct the problem...
http://discussions.apple.com/thread.jspa?threadID=3754
59&tstart=0
2) This tends to happen after videos. Give the iPod a
minute or two to readjust. It should now be more
accurate.
3) This?
iPod shows a folder icon with exclamation
point
4) Restore the iPod
5) Try these...
iPod Only Shows An Apple Logo and Will Not Start
Up
iPod Only Shows An Apple Logo
I think 3,4, and 5 are related. Try the options I
posted for each one.
btabz
I just noticed that one of the restore methods you posted was to put it into Disk Mode First rather than just use the resstore straight off, I Have tried that and seems to have solved the problem, If it has thank you. previously I have only tried just restoring it skipping this extra step. Hope my iPod stays healthy, if it doesnt its a warrenty job me thinks any way thanks again

Problems with exec() in Servlet

Hi All,
In my project i have used exec()in servlets to get the ouput from the c- program.I am using linux 8.0 and the server is tomcat-4.1.24.so that i try this following code:-
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class ServletExecute extends HttpServlet
public void doGet(HttpServletRequest req,HttpServletResponse res)throws ServletException,IOException
String[] command={"/bin/csh","-c","home/anand/Ananth/grpmaschk.run sptest S"};/*Here the grpmaschk.run is a c-program which genarates an output that is passed to sptest as parameter and S is a argument which indicates the action is done from Servlet*/
res.setContentType("text/plain");
PrintWriter out=res.getWriter();
Process p=null;
Runtime rt=Runtime.getRuntime();
try
p=rt.exec(command);//Executing the action on command string
catch(Exception e)
out.println("The Error Message is:"+e.getMessage());
try
FileInputStream fin=new FileInputStream("/home/Ananth/sptest");/*
Once the output is generated from the c-program it will be stored in the sptest in /home/Ananth */
BufferedReader br =new BufferedReader(new InputStreamReader(fin));
String line=null;
while((line=br.readLine())!=null)
out.println(line); //From there i am reading the contents in it to be displayed in the browser
} catch(Exception e1)
out.println("The error message was:"+e1.getMessage());
Whren it is displayed in the browser i am getting an error
/home/Ananth/sptest not found which means that exec() is not working (or)executing.What is the problem here ???Plz. do provide a solution for this.It is quite Urgent.I will be waiting for ur replies.
Thanx,
m.ananthu

Hi sir,
Sorry for the mistake i did there but by using /home/....
also the output is not coming.
Here is the code again for ur reference:-
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class ServletExecute extends HttpServlet
public void doGet(HttpServletRequest req,HttpServletResponse res)throws ServletException,IOException
String[] command={"/bin/csh","-c","/home/anand/Ananth/grpmaschk.run","home/anand/Ananth/sptest S"};//corrected one
res.setContentType("text/plain");
PrintWriter out=res.getWriter();
Process p=null;
Runtime rt=Runtime.getRuntime();
try
p=rt.exec(command);
catch(Exception e)
out.println("The Error Message is:"+e.getMessage());
try
FileInputStream fin=new FileInputStream("/home/anand/Ananth/sptest");
BufferedReader br =new BufferedReader(new InputStreamReader(fin));
String line=null;
while((line=br.readLine())!=null)
out.println(line);
} catch(Exception e1)
out.println("The error message was:"+e1.getMessage());
Here exec(....) is going through but the path in FileInputStream is showing an error.The error message i got when i run it in the browser is :-
The error message was:/home/anand/Ananth/sptest (No such file or directory).Which means exec() function itself is not executed???. Is there any thing to do with security reasons or anything u need to configure in the tomcat configuration file??? Where i found that
when i give /home/anand/Ananth/grpmaschk.run only in the exec() then the output is diaplyed in the browser.So i think exec() is workuing well but not with this huge argument
String[] command={"/bin/csh","-c","/home/anand/Ananth/grpmaschk.run","home/anand/Ananth/sptest S"};
Pls. do provide a solution for this problem.I will be waiting for ur replies.....
Thanx,
m.ananthu

Problem with my applet-servlet comunication

Hello:
I'm using a dynamic chart on my applet, which gets the data from a servlet, by URLConnection. These service work, but after a moment, the chart scroll is stopped and I get the next error on java console:
java.security.AccessControlException: access denied (java.net.NetPermission
getProxySelector)
at
java.security.AccessControlContext.checkPermission(AccessControlContext.java
:264)
at java.security.AccessController.checkPermission(AccessController.java:427)
at
java.lang.SecurityManager.checkPermission(Ljava.security.Permission;)V(Unkno
wn Source)
at
sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:6
61)
at jfch.AppletGraphic$DataGenerator.sendCommand(AppletGraphic.java:307)
at jfch.AppletGraphic$DataGenerator.actionPerformed(AppletGraphic.java:259)
at javax.swing.Timer.fireActionPerformed(Timer.java:271)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
at
java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.ja
va:234)
at
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java
:163)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
at java.awt.EventDispatchThread.run(EventDispatchThread.
The applet make request to servlet by URLConection permanently, which gets
the data from SQL Server.
I'm using JVM 1.5.
The applet makes requests to servlet by normally url, not access to local resources (or file system).
Please can anyone help me?
Regards, Ulises.

http://java.sun.com/j2se/1.5.0/docs/api/java/net/ProxySelector.html
Selects the proxy server to use, if any, when connecting to the network resource
referenced by a URL. A proxy selector is a concrete sub-class of this class and is
registered by invoking the setDefault method. The currently registered proxy selector
can be retrieved by calling getDefault method.
The getDefault Throws:
SecurityException - If a security manager has been installed and it denies
NetPermission("setProxySelector")
http://java.sun.com/j2se/1.5.0/docs/api/java/net/NetPermission.html
getProxySelector
The ability to get the proxy selector used to make decisions on which proxies
to use when making network connections.
Malicious code can get a ProxySelector to discover proxy hosts and ports on
internal networks, which could then become targets for attack.
I checked my java.policy for my w2k jre 1.5 installation but could not find any specific
NetPermission in there. I never had this problem using URL and URLConnections
in 1.5 but it sounds strange that creating an URL in an applet could throw a
SecurityException with the default jre 1.5 installation (both objects are introduced
since 1.5).
If you are using windows could you open the java control panel and select "use
browser settings" in the General tab after clicking the "Network settings" button?
I have this option in my jre settings and never got that Exception.

Problems with EJB and Servlet

I'm doing a simple servlet that invokes an EJB taht returns an ArrayList with a values.
My problem is that I do trace of my execution an this woks well in the EJB but when my remothe method do the return the app finish and never return to servlet that invoked it. I don't know 'cause this happend.
I'm using WASD 5.0.1 as my Web y EJB container.
Help would be appreciate

What does that ArrayList contain?
Could you post the code please.

Problems with my first site. Please help.

Hi,
I am fairly new to flash. I need some help if anyone can
spare a few moments. First off, my site is about 15mb in size and I
have it hosted by a shared hosting service. It takes a VERY long
time to load. Since I am new to this, I cannot tell whether to
upgrade the hosting service or to downgrade the flash site itself
and delete some content. Please advise.
Also, I used a template for this site, and was sucessful in
customising it, one problem is that I have a gallery in there and
only about 10 pictures on the screen, I have 'pre-made' buttons in
the botom that supposed to act as links to the next page (says
'next' in the bottom of the page), but I have no idea how to
duplicate the existing page and link it so that I can paste new
pics on page 2 and link it to page one. Can someone please point me
in the right direction?
the website is sikdancemuvz.com
Thanks in advance.

OMG! 15MB? that's pretty insane regardless of the user's
bandwith - with good amount of traffic to
your site you will quickly reach the bandwith limit set by
your host and incur possible additional
hosting costs.
let's put it this way - a well designed website in general
(flash, html, hybrid, etc..) should way
in around 100k depending - a good idea of the weight of a
basic HTML page would be around 30-50k
depending on graphics.
What do you have in your flash movie? Video? Audio? Are you
using any compression on anything? Look
up loadMovie in the Flash help docs as well.
As for your question on "pages" - Flash doesn't have "pages"
per se - so not sure exactly what you
mean here.
I have a funny feeling your biggest problem is a lck of
knowledge about graphics and delivering
multimedia to the web in general.
Your site, on my cable modem, took several minutes to load -
nowadays, if a site doesn't load
instantly (or at worst, within 3 seconds) the user is going
to close the browser or navigate away
from your site.
So, once your site loaded (finally) there was annoying
"Enter" button - what was I waiting for?
So it seems you have entire high quality music and graphics
here...this site, if built properly
should have loaded within 2 seconds maximum - this is
achieved by having some very light weight
content to load quickly at first - then load more content in
the background - use loadMovie to load
separate SWF movies into one single container movie. NEVER
make the user sit and wait for content
they may decide not to listen to or look at.
There is no one direction to point you too - you need to
understand the web, flash and graphics and
how it all comes together in a way that is user friendly.
www.gotoandlearn.com
www.keyframer.com
www.lynda.com
www.kirupa.com
Chris Georgenes
Adobe Community Expert
mudbubble.com
keyframer.com
howtocheatinflash.com
maxswellz wrote:
> Hi,
>
> I am fairly new to flash. I need some help if anyone can
spare a few moments.
> First off, my site is about 15mb in size and I have it
hosted by a shared
> hosting service. It takes a VERY long time to load.
Since I am new to this, I
> cannot tell whether to upgrade the hosting service or to
downgrade the flash
> site itself and delete some content. Please advise.
>
> Also, I used a template for this site, and was sucessful
in customising it,
> one problem is that I have a gallery in there and only
about 10 pictures on the
> screen, I have 'pre-made' buttons in the botom that
supposed to act as links
> to the next page (says 'next' in the bottom of the
page), but I have no idea
> how to duplicate the existing page and link it so that I
can paste new pics on
> page 2 and link it to page one. Can someone please point
me in the right
> direction?
>
> the website is sikdancemuvz.com
>
> Thanks in advance.
>

Problem with form or servlet???

hello..
i am trying to send some form data to a servlet for processing..
here is the code for the form
<table border="0">
<form action="details.upd" method="post" name="upd">
<tr><td>Username</td><td><input name="uname" type="text" size="25" maxlength="30"
value=<%=session.getAttribute("user") %> /></td>
</tr>
<tr>
<td>password</td><td><input name="pass" type="password" size="25" maxlength="30" />
</td></tr>
<tr><td>confirm password</td><td><input name="pass2" size="25" maxlength="30" type="password"/></td></tr>
<tr><td>Email</td><td><input name="mail" type="text" size="25" maxlength="30"
value=<%=session.getAttribute("EMAIL") %> /></td></tr>
<tr><td align="center"><input name="submit" type="button" value="Update" /></td></tr>
<tr><td align="center"><input name="ch" type="hidden" value="det"/></td></tr>
</form>
</table>
here is the web.xml entry for my compiled servlet
<servlet>
<servlet-name>update</servlet-name>
<description>
Servlet used for updates sent from landlord sessions
</description>
<servlet-class>UpdateServlet</servlet-class>
<load-on-startup>5</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>update</servlet-name>
<url-pattern>*.upd</url-pattern>
</servlet-mapping>
the problem is that when i click the submit button to send the data, nothing happens....absolutely nothing. the page just stays as it is...please can u spot any fatal error in the code?
I have looked and looked without success..please help

yeah..i solved that.. but now i am getting another
problem...
why does this code...
Stringuser=(String)session.getAttribute("user");
gives me a class cast exception????
please helpBecause the object named "user" in your session isn't
a String.ok...thks

Problem with JSP and servlet in Tomcat

hello all,
I have made a simple hello world in Eclipse and Tomcat, it works well on my localhost, but now that I try to run it on the server in our lab I got this exception:
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
javax.servlet.ServletException: Implementing class
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:272)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause
java.lang.IncompatibleClassChangeError: Implementing class
     java.lang.ClassLoader.defineClass1(Native Method)
     java.lang.ClassLoader.defineClass(ClassLoader.java:620)
     java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
     org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1815)
     org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:869)
     org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1322)
     org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1201)
     org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:127)
     org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:65)
     java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
     java.lang.Class.getDeclaredConstructors0(Native Method)
     java.lang.Class.privateGetDeclaredConstructors(Class.java:2328)
     java.lang.Class.getConstructor0(Class.java:2640)
     java.lang.Class.newInstance0(Class.java:321)
     java.lang.Class.newInstance(Class.java:303)
     org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:148)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:317)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
I have transfered the web.xml file and lib and classes folder in a WEB-INF folder and also all the JSP files. I can see he JSP file, but the 'hello worl' does not work and gives this exception!
Does any one have any idea what could be the problem?
thanks a lot
Mitra

seems the web Server code previously loaded a class only when it was used rather than when it was referenced,
ask your question in the tomcat-user mailing ! !!!

Problems with my first Servlet

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