Servlet RequestDispatch problem

I am using RequestDispatch to pass control from one servlet to another. My problem is that when I forward the request...
It passes control to the next servlet which executes all the way through. But then passes control back to the calling servlet which executes the rest of its code from the forward method call and the first servlet is the one that outputs HTML. What am I doing wrong. I don't want the first servlet to regain control..
RequestDispatcher dispatcher = m_request.getRequestDispatcher(url);
dispatcher.forward(req,res);

Do you want RequestDispatcher.forward() to act like System.exit()? I.E., the thread that is called is terminated? If you want the servlet calling forward NOT to execute after the call to forward then return after the forward is complete. Remember that you are forwarding the request, not (necessarily) the thread, so execution of your method will continue unless you explicitly exit.

Similar Messages

Servlet Compilation Problem !

Hi,
I am just starting to learn servlets and I got problem in compiling them. I got compilation error in
import javax.servlet.*;statement. Seems that the compiler cannot find the servlet package. I got J2EE 1.4 beta installed on my machine but there is no servlet.jar package. I am using J2SDK 1.4.1_02, J2EE 1.4 beta and Tomcat 4.1.24.
Can anyone help me with my servlet compilation problem?
Thanks in advance!
Josh

servlet.jar is here :
<tomcatdir>\common\lib
add it to your compiler classpath

Servlet chaining problem..

import java.io.*;
    import javax.servlet.*;
    import javax.servlet.http.*;
    public class Deblink extends HttpServlet {
      public void doGet(HttpServletRequest req, HttpServletResponse res)
                                   throws ServletException, IOException {
        String contentType = req.getContentType(); // get the incoming type
        if (contentType == null) return; // nothing incoming, nothing to do
        res.setContentType(contentType); // set outgoing type to be incoming type
        PrintWriter out = res.getWriter();
        BufferedReader in = req.getReader();
        String line = null;
        while ((line = in.readLine()) != null) {
          line = replace(line, "<BLINK>", "");
          line = replace(line, "</BLINK>", "");
          out.println(line);
      public void doPost(HttpServletRequest req, HttpServletResponse res)
                                    throws ServletException, IOException {
        doGet(req, res);
      private String replace(String line, String oldString, String newString) {
        int index = 0;
        while ((index = line.indexOf(oldString, index)) >= 0) {
          // Replace the old string with the new string (inefficiently)
          line = line.substring(0, index) +
                 newString +
                 line.substring(index + oldString.length());
          index += newString.length();
        return line;
What is pre request fo above code to work.
I had tried this many time but it is not working, what will be calling servlet look like

And can you explain why your title is "Servlet chaining problem"?

Servlet to Jsp RequestDispatcher Problem

Hi All,
I have come across a problem that wont allow me to post from a servlet to a jsp file.
Here is the code im using. When i try to run it an internal error occurs.
RequestDispatcher dispatcher;
dispatcher = request.getRequestDispatcher("/Catalogue.jsp");
dispatcher.forward(request, response);
For some reason the dispatcher.forward(resquest, response) doesnt work.
Can any one help me please?

What happens? Do you get an error message in the browser? In your servlet log? If so, what's the error message. If not, what's the behavior like?

Forwarding JSP page through requestdispatcher problem in submiting form

Hello everyone,
I am very much new to servlet.
My problem is somewhat this....
when i am forwarding one JSP page by requestdispather , there is no problem.But after that when i am trying to submit one html form written inside the jsp page , the request is not submiting the jsp page rather it resides in the servlet.
The code in servlet is
RequestDispatcher rd =getServletContext().getRequestDispatcher("/applyConfirm.jsp");
rd.forward(request,response);
Now in (applyConfirm.jsp )jsp page one button is there , so when i will click that button the page has to be submitted.But its not submitting rather the request resides in the servlet.
Dose someone will have any idea.
Thanks in advance

First check what sort of button you are using. It should be of "submit" type.
Check the URL to witch URL it is submitting i.e. Action property in <FORM> tag.
Make sure for the URLs in the client i.e HTML ex: href, action, and so on use the thumb rule of prefixing "<%=request.getContextPath()%>/" in your JSP or in servlet add it in the java code.
This should solve the relative URL reference problem.
Hope this helps.
Cheers.

Jsp-servlet-bean problem

Please help!
I have a servlet controller, a javabean for the data and a jsp for the view.
I cannot get the jsp using
<jsp:useBean id="pList" class="bbs.PostListCommand" scope="request" />
to access the bean data
However, when I access the bean in this way
<%@ page import="bbs.PostListCommand" %>
// html
<% bbs.PostListCommand postList = null;
synchronized(session){
     postList = (bbs.PostListCommand) session.getAttribute("PostListCommand");
     if (postList == null){ %>
          <H1>Nothing in request scope to retrieve ....</H1>
          <P>
<%     }
     else{ %>
          <TABLE border="1">
// etc
� it works
Does anyone know why the <jsp:useBean> tag does not find the bean
I have installed tomcat 4.18 and set the environmental variables etc.
Directory structure is
E:\Tomcat41\webapps\examples\WEB-INF\jsp          for jsp�s
E:\Tomcat41\webapps\examples\WEB-INF\classes\bbs     for bean and servlets
Thanks in advance for any help.
Chris

GrayMan - Thanks for your help.
Let me explain my problem in more detail ...
Background:
I have some servlet experience, but I am new to jsp - so sorry if this seems trivial to you ...
I have a book called bitter java by bruce tate from manning.com . I am trying to get the chapter 3 examples to work
There are three files
PostListCommand          the bean
PostListController     the servlet
PostListResults          jsp
And a new test file � PostListResults version 2 with scriptlet code to access the bean.
There are a couple of typos in the downloaded source files, but nothing that causes the main problem of not being able to access the bean data.
Program flow
Servlet instantiates new bean
Bean � gets data from db
Servlet passes bean to jsp with a forward
Jsp outputs data
I have put the files in the directories �
E:\Tomcat41\webapps\examples\WEB-INF\jsp          for jsp�s
E:\Tomcat41\webapps\examples\WEB-INF\classes\bbs     for bean and servlets
The complete source code for each file is given below.
1 I have checked the db access � that�s ok
2 I have also checked reading the bean data back in from the request scope and printing out the results from within the servlet.- ok
3 I can access the data through a scriptlet (PostListResults version 2), but not with the original PostListResults which uses <jsp:useBean>
thanks in advance, chris
PostListController.java
package bbs;
// Imports
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
// Import for commands used by this class
import bbs.PostListCommand;
public class PostListController
extends javax.servlet.http.HttpServlet
implements Serializable {
* DoGet
* Pass get requests through to PerformTask
public void doGet(
HttpServletRequest request,
HttpServletResponse response)
throws javax.servlet.ServletException, java.io.IOException {
performTask(request, response);
public void performTask(
HttpServletRequest request,
HttpServletResponse response) {
try {
PostListCommand postList = (bbs.PostListCommand) java.beans.Beans.instantiate(getClass().getClassLoader(),"bbs.PostListCommand");
postList.initialize();
postList.execute();
request.setAttribute("PostListCommand", postList);
ServletContext sc = this.getServletContext();
RequestDispatcher rd =
sc.getRequestDispatcher("/jsp/PostListResults.jsp");
rd.forward(request, response);
} catch (Throwable theException) {
theException.printStackTrace();
PostListCommand.java
package bbs;
import java.io.*;
import java.sql.*;
//import COM.ibm.db2.jdbc.*;
import java.util.*;
* Insert the type's description here.
* Creation date: (07/17/2001 5:07:55 PM)
* @author: Administrator
public class PostListCommand {
// Field indexes for command properties
private static final int SUBJECT_COLUMN = 1;
private static final int AUTHOR_COLUMN = 2;
private static final int BOARD_COLUMN = 3;
protected Vector author = new Vector();
protected Vector subject = new Vector();
protected Vector board = new Vector();
// SQL result set
protected ResultSet result;
protected Connection connection = null;
* execute
* This is the work horse method for the command.
* It will execute the query and get the result set.
public void execute()
throws
java.lang.Exception,
java.io.IOException {
try {
// retrieve data from the database
Statement statement = connection.createStatement();
result =
statement.executeQuery("SELECT subject, author, board from posts");
while (result.next()) {
subject.addElement(result.getString(SUBJECT_COLUMN));
author.addElement(result.getString(AUTHOR_COLUMN));
board.addElement(result.getString(BOARD_COLUMN));
result.close();
statement.close();
} catch (Throwable theException) {
theException.printStackTrace();
* getAuthor
* This method will get the author property.
* Since the SQL statement returns a result set,
* we will index the result.
public String getAuthor(int index)
throws
java.lang.IndexOutOfBoundsException,
java.lang.ArrayIndexOutOfBoundsException {
return (String) author.elementAt(index);
* getBoard
* This method will get the board property.
* Since the SQL statement returns a result set,
* we will index the result.
public String getBoard(int index)
throws
java.lang.IndexOutOfBoundsException,
java.lang.ArrayIndexOutOfBoundsException {
return (String) board.elementAt(index);
* getSubject
* This method will get the subject property.
* Since the SQL statement returns a result set,
* we will index the result.
public String getSubject(int index)
throws
java.lang.IndexOutOfBoundsException,
java.lang.ArrayIndexOutOfBoundsException {
return (String) subject.elementAt(index);
* initialize
* This method will connect to the database.
public void initialize()
throws java.io.IOException {
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver").newInstance();
// URL is jdbc:db2:dbname
String url = "jdbc:db2:board";
// URL is jdbc:odbc:bitter3board
String url = "jdbc:odbc:bitter3board";
// connect with default id/password
connection = DriverManager.getConnection(url);
} catch (Throwable theException) {
theException.printStackTrace();
* Insert the method's description here.
* Creation date: (07/17/2001 11:38:44 PM)
* @return int
* @exception java.lang.IndexOutOfBoundsException The exception description.
public int getSize() {
return author.size();
PostListResults.jsp
<HTML>
<HEAD>
<TITLE>Message Board Posts</TITLE>
</HEAD>
<BODY BGCOLOR=#C0C0C0>
<H1>All Messages</H1>
<P>
<jsp:useBean id="postList" class="bbs.PostListCommand" scope="request"></jsp:useBean>
<TABLE border="1">
<TR>
<TD>Subject</TD>
<TD>Author</TD>
<TD>Board</TD>
</TR>
<% for (int i=0; i < postList.getSize(); _i++) { %>
<TR> <TD><%=postList.getSubject(_i) %></TD>
<TD><%=postList.getAuthor(_i) %></TD>
<TD><%=postList.getBoard(_i) %></TD>
</TR>
<% } %>
</TABLE>
<P>
</BODY>
</HTML>
PostListResults.jsp version 2 � with scriplet code instead of useBean
<HTML>
<%@ page import="bbs.PostListCommand" %>

<HEAD>
<TITLE>Message Board Posts</TITLE>
</HEAD>
<BODY BGCOLOR=#C0C0C0>
<% bbs.PostListCommand postList = null;
synchronized(request){
     postList = (bbs.PostListCommand) request.getAttribute("PostListCommand");
     if (postList == null){ %>
          <H1>Nothing in request scope to retrieve ....</H1>
          <P>
<%     }
     else{ %>
          <TABLE border="1">
          <TR>
          <TD>Subject</TD>
          <TD>Author</TD>
          <TD>Board</TD>
          </TR>
     <% for (int i=0; i < postList.getSize(); _i++) { %>
               <TR> <TD><%=postList.getSubject(_i) %></TD>
          <TD><%=postList.getAuthor(_i) %></TD>
          <TD><%=postList.getBoard(_i) %></TD>
          </TR>
     <% } %>
          </TABLE>
<%     }
}%>
<P>
goodnight
</BODY>
</HTML>

Servlet/JSP problems with WL 4.51

Hi all
          I have a set of Servlets and JSPs running on NewAtlanta's ServletExec
          servlet engine. I am currently porting them to WebLogic. I am facing a
          few problems. I do not want to change any of my HTML/JSP/Java files
          immediately. I want the same files to work in WL as it is. Pl help.
          1. The servlets in ServletExec used to be invoked as
          http://host/servlet/servletName. But in weblogic they are invoked
          as http://host/servletName. I tried registering the servlet names
          in weblogic.properties as
          weblogic.httpd.register.servlet/XServlet=com.foo.XServlet
          weblogic.httpd.initArgs.servlet/XServlet=param=value
          Now I can call this servlet as http://host/servlet/XServlet and so
          I dont have to change any html/JSP files. Will this cause any
          problems in the future?
          2. Since we used to run ServletExec on IIS, we created a virtual
          directory called /jsp in IIS under which we had all the html and
          JSP files. Our servlets will get the http requests, get data from
          database, put the results in session/request variables and dispatch
          it to appropriate JSP page. So, all our servlet code looks like
          this:
          RequestDispatcher dispatcher =
          getServletContext().getRequestDispatcher("/jsp/test.jsp");
          dispatcher.forward(request, response);
          How do I make this code work with WebLogic? Is there any way to
          create virtual directory and make it work like in IIS?
          Thanks for any help.
          shiv
          [email protected]


You might try
          weblogic.httpd.register.jsp/*.jsp=weblogic.servlet.JSPServlet
          but a better/ easier way would be to just move all of your jsp files to a 'jsp'
          subdirectory beneath public_html
          -rrc
          Shiv Kumar wrote:
          > Hi all
          >
          > I have a set of Servlets and JSPs running on NewAtlanta's ServletExec
          > servlet engine. I am currently porting them to WebLogic. I am facing a
          > few problems. I do not want to change any of my HTML/JSP/Java files
          > immediately. I want the same files to work in WL as it is. Pl help.
          >
          > 1. The servlets in ServletExec used to be invoked as
          > http://host/servlet/servletName. But in weblogic they are invoked
          > as http://host/servletName. I tried registering the servlet names
          > in weblogic.properties as
          >
          > weblogic.httpd.register.servlet/XServlet=com.foo.XServlet
          > weblogic.httpd.initArgs.servlet/XServlet=param=value
          >
          > Now I can call this servlet as http://host/servlet/XServlet and so
          > I dont have to change any html/JSP files. Will this cause any
          > problems in the future?
          >
          > 2. Since we used to run ServletExec on IIS, we created a virtual
          > directory called /jsp in IIS under which we had all the html and
          > JSP files. Our servlets will get the http requests, get data from
          > database, put the results in session/request variables and dispatch
          > it to appropriate JSP page. So, all our servlet code looks like
          > this:
          >
          > RequestDispatcher dispatcher =
          > getServletContext().getRequestDispatcher("/jsp/test.jsp");
          > dispatcher.forward(request, response);
          >
          > How do I make this code work with WebLogic? Is there any way to
          > create virtual directory and make it work like in IIS?
          >
          > Thanks for any help.
          > --
          > shiv
          > [email protected]
          Russell Castagnaro
          Chief Mentor
          SyncTank Solutions
          http://www.synctank.com
          Earth is the cradle of mankind; one does not remain in the cradle forever
          -Tsiolkovsky

Css and RequestDispatcher problem

I'm using JBoss + embedded Tomcat (not using apache
yet in development).
I have problem with JSP and css. My JSP includes css
with this tag:
<link rel="stylesheet" href="style.css" type="text/css">If I access the JSP directly from web-browser IE5
to http://127.0.0.1:8080/myContext/fileName.jsp ,
it's displayed correctly.
However, if I let a servlet dispatch the JSP, the css didn't
included somehow (browser displayed the JSP without css-formatting).
RequestDispatcher dispatcher = getServletContext().
                         getRequestDispatcher("/fileName.jsp");
    if (dispatcher != null)
        dispatcher.forward(request, response);
    /* ... */I put css and JSP in the same subdir. Is this a Tomcat error, or
I forgot to set something in the request object, or
I need to append something to "/fileName.jsp"?
Thanks in advance.
Verdi

Unfortunately, the solution I found was to "hardcode" the absolute path. For example:<link rel="stylesheet" href="<%= request.getContextPath() %>/style.css" type="text/css">There're another way I think may preserve the context
path, that is to use response.sendRedirect. Problem with
this approach is however, you can't embedd javabean
as "attribute" cause attribute will be removed in the new request (of redirected jsp).
-- Verdi March --

Tomcat Servlet Security Problem? : Start Excel with NJAWIN - COMObjects

I get an exception when I start my programm as servlet , as application it works just fine (when I start it as Servlet in the internal Tomcat from JBuilder it also works fine).
Application app = new Application(Application.progID); // interfaces built with java2com for Excel
com.develop.jawin.COMException: 8000ffff: CoCreateInstance for "{024500-00-0000-c000-000000000046}" failed
at com.develop.jawin.win32.Ole32.CoCreateInstance(Unknown Source)
at com.develop.jawin.win32.Ole32.GetFromProgID(Unknown Source)
at com.develop.jawin.DispatchPtr.<init>(Unknown Source)
at excel2pdf.Excel._Application.<init>(_Application.java:31)
Actually Excel is started but as SYSTEM and not as my Username. Perhaps there's a problem with the security policy, I already gave all rights to catalina for my whole projekt( each directory of it). Have smb already had this problem? Any Ideas?

Thanks for answering
In my case I think I cannot use POI because I need Excel
and a Virtual Printer , so I can convert excel files with exactly the same
format to PDF. POI is suppose better idea for creating or manipulating
OpenOffice files (they are working together with OO on file formats),
and unfortunately OpenOffice doesnt work fine with charts (I already had
this solution, openoffice-server and Uno ).
It must be smth with Tomcat-Configuration or security, because my
programm is working with the internal tomcat-server of JBuilder, and
as application too. In both cases Excel is started with my username and
not SYSTEM (my tomcat server is started as service, perhaps thats why
by starting excel from my servlet Excel is by user - SYSTEM).

Applet-Servlet Communication problem EOFException

Hi! i´ve been searching and searching through forums because it seems this problem is very common, but none of the solutions i´ve seen so far suits me, so i´m here looking for some help because i´ve been stuck one week with this. First of all sorry if my english isn´t the best... i´m a bit rusty...
Well, i had some code that worked perfectly, but i needed to perform some changes because i needed the servlet to send more info to the applet, and here started the problems, when i made the changes it started to throw EOFException when i was trying to read the InputStream, and furthermore when i came back to the original code it started to throw the exception in the same place too
So here i am... don´t know what to do now and i entrust to you to give me some tips.
Here comes some code. This is the original code, the one that runned but it doesn´t run right now
Applet:
public ListasComponentesSeleccionables cargarListasComponentes( ) throws IOException, ClassNotFoundException {
          String serv = "/Desaladora/cargarListasComponentesApplet.do";
          String host = Principal.documentBase.getHost( );
          URL direccion = new URL( "http", host, 8080, serv );
          // Create conection
          URLConnection connection = direccion.openConnection( );
          connection.setDoInput( true );
          connection.setDoOutput( true );
          connection.setUseCaches( false );
          connection.setRequestProperty( "Content-Type", "application/x-java-serialized-object" );
          ObjectOutputStream output;
          output = new ObjectOutputStream( connection.getOutputStream( ) );
          output.writeObject( new Boolean(true) );
          output.flush( );
          output.close( );
          ObjectInputStream input = new ObjectInputStream( connection.getInputStream( ) ); //<-- Here is the problem
          ListasComponentesSeleccionables response = new ListasComponentesSeleccionables( );
          response = ( ListasComponentesSeleccionables ) input.readObject( );
          return response;
     }Servlet:
ublic class CargarListasComponentesAppletAction extends Action {
public ActionForward execute(     ActionMapping mapping,
                                                 ActionForm form,
                                                 HttpServletRequest request,
                                                 HttpServletResponse response )
                        throws ServletException, IOException, Exception {
          InitialContext context = new InitialContext();
          SensorManagerService sensor_service;
          ActuatorManagerService actuator_service;
          Globals.LOGGER_SECURITY.debug( "Entering ACTION 'CargarListasComponentesAppletAction'" );
          response.setContentType("application/x-java-serialized-object");
          try
               ObjectInputStream bufferentrada = new ObjectInputStream(request.getInputStream());
               Boolean peticionOK = (Boolean)bufferentrada.readObject();
               ObjectOutputStream buffersalida = new ObjectOutputStream(response.getOutputStream());
               sensor_service = ( SensorManagerService ) context.lookup( "desaladora/SensorManagerServiceBean/local" );
               ArrayList<AlarmConnectedSensorDTO> sensorList = sensor_service.findAllSensorsToAlarms();
               actuator_service = ( ActuatorManagerService ) context.lookup( "desaladora/ActuatorManagerServiceBean/local" );
               ArrayList<AlarmConnectedActuatorDTO> actuatorList = actuator_service.findAllActuatorsToAlarms();
               buffersalida.writeObject( crearListasSeleccionables(sensorList, actuatorList) );
               buffersalida.flush();
          catch(Exception e)
               System.out.println("Error en la trasmision de datos");
          return null;
     private ListasComponentesSeleccionables crearListasSeleccionables(ArrayList<AlarmConnectedSensorDTO> sensorList,
                ArrayList<AlarmConnectedActuatorDTO> actuatorList) {
          Vector<Integer> vectorSensores = new Vector<Integer>();
          Vector<Integer> vectorActuadores = new Vector<Integer>();
          for(AlarmConnectedSensorDTO sensor : sensorList) {
               vectorSensores.add(sensor.getIdSensor( ));
          for(AlarmConnectedActuatorDTO actuator : actuatorList) {
               vectorActuadores.add(actuator.getIdActuator( ));
          ListasComponentesSeleccionables listasComponentesSeleccionables =
                              new ListasComponentesSeleccionables(vectorSensores, vectorActuadores);
          return listasComponentesSeleccionables;
}i´ve been running some test in another computer, and this code simply works, but it doesn´t work in the machine i usually work.
Maybe someway the stream get corrupt? the info i´ve been trying to send and started throwing the exception may still be in the stream? I don´t know what to think right now.
Hope someone has any idea, thankyou.

I dont see the problem. However, I suggest you change this;
System.out.println("Error en la trasmision de datos"); t
to e.printStackTrace() to see what it is doing when it stops working.
I also suggest peppering your code with System.out.println() statements to see what it is doing just before stopping.
Also, try your code with a brand new file with only a few characters in it. If it works, add to it some of your originial file content until it stops working. This way, you can determine if its the file size that is causing the crash or something in the file content. If all else fails, study java I/O and try some other way to read/write the file. You can also try a different browser. If it works, its the browser. Still having problems? Create a new project with a simple applet and file read/write program and get that working. That way, all the other stuff in your original project isn't in the way.

Servlet mapping problem in Resin, very weird!

ENV: resin 2.1.6 on windows 2000
1, I copied all the files and folders in $resin/doc/java_tut to $resin/webapps
2, I did a little change to $resin/conf/resin.conf
In the old resin.conf, there is a lot about the '/' webapp.
<web-app id='/'>
<classpath id='WEB-INF/classes'
source='WEB-INF/classes'
compile='true'/>
</web-app>
I replaced it just with
<web-app id='/'/>
3, I tested the 'java_tut' webapp
http://localhost:8080/java_tut/servlet/example.servlet.basic.MappingServlet
works well.
http://localhost:8080/java_tut/exact
works well, too.
4, Then I tested the '/' webapp
http://localhost:8080/servlet/example.servlet.basic.MappingServlet
works well.
but
http://localhost:8080/java_tut/exact
returns error code 404
what's the problem?

don't you need to get rid of the java_tut bit?

How to send Oracle rowid to servlet? | Problem with national characters.

There is same possibility how to send rowid to servlet?
I have now definition like this:
<af:image source="/imageservlet?Par1=#{bindings.Col1.inputValue}"/>
But If column contents national characters, servlet methods obtained changed these characters.
My idea is to use not primary key for row, but use oracle rowid. It is simply possible?
Use something like this:
<af:image source="/imageservlet?Rowid=#{bindings.Rowid}"/
Or Do you have ideas how to solve problem with national characters ?
Thanks
FiL

Hi,
Although your workaround works.
I think this is a simple encoding problem.
I simply need to make sure all parameters and pages are encoded with a char set which contains the national characters you mentioned.
This is a bit dependent on the exact technology your using, but most can be done via the web.xml:
<jsp-config>
      <jsp-property-group>
          <url-pattern>*.jsp</url-pattern>
          <page-encoding>UTF-8</page-encoding>
      </jsp-property-group>
</jsp-config>     This forces all JSP pages to be encoded in UTF-8
Adding the following parameter sometimes helps as well, although I think this one is a bit dated:
You said your using a servlet so your servlet needs a similar block for its pattern
<context-param>
    <param-name>PARAMETER_ENCODING</param-name>
    <param-value>UTF-8</param-value>
</context-param>If you want to be 100% sure the encoding is set right make sure thepages contain:
<%@ page contentType="text/html;charset=utf-8"%>Or depending on your view technology the syntax can be a bit different
-Anton

Servlet configuration problems ..

Hi
I am a new member starting with Java Servlets:
I have a problem with Configuring the Servlet on the J2EE Application server.
Here is the Servlet code ...
package mypackage;
public class ShowParameters extends HttpServlet {
    public void doGet(HttpServletRequest request, HttpServletResponse response)         throws ServletException, IOException { .... }And this is the web.xml file
    <servlet>
        <servlet-name>ShowParameters</servlet-name>
        <servlet-class>mypackage.ShowParameters</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>ShowParameters</servlet-name>
        <url-pattern>/ShowParameters</url-pattern>
    </servlet-mapping>And the HTML file is ....
<FORM ACTION="ShowParameters">
    First Parameter: <INPUT TYPE="TEXT" NAME="param1"><BR>
    Second Parameter: <INPUT TYPE="TEXT" NAME="param2"><BR>
    Third Parameter: <INPUT TYPE="TEXT" NAME="param3"><BR>
    <CENTER>
        <INPUT TYPE="SUBMIT">
    </CENTER>
</FORM>I have set the CLASSPATH variable t /build/mypackage/
I get two erros:
Wrapper cannot find servlet class ..
ClassNotFound exception ...
Also, how do I compile " the servlet class file with the line; package hello; " with the package name
I would appreciate any help ..
Thanks
N

I am trying to invoke a servlet from an HTML page.
Method 1
    <FORM ACTION="ThreeParams" METHOD="GET">
        First Parameter: <INPUT TYPE="TEXT" NAME="param1"><BR>
           <CENTER>
        <INPUT TYPE="SUBMIT">
    </CENTER>
    </FORM>Method 2
<td><a href="Threeparams">Execute</a></td>Method 1 does not work but Method 2 does. But Method 2 does not transmit param1 to the server.
Any thought on how to get it correct?
Rgds
N

Servlet side problem

hi there,
i have managed to get my mipd program talking 2 a tomcat server, but i have run into the following problem:
the servlet has at initiation a buffer called int l = 0; and increment the l value by 1 , this is fine but when i get another phone 2 connect to the server, i want the value of l to increment to 2, instead the value resets to 0 and then increments by 1 giving me the final value of 1 yet again on the second phone
here is the code:
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class testing3 extends HttpServlet{
int l;
public testing3(){ l=0;}
public void doPost(HttpServletRequest req,HttpServletResponse res) throws IOException,ServletException{
InputStream in = req.getInputStream();
PrintWriter out = res.getWriter();
String rankstring = "sent by server";
int requestlength = req.getContentLength();
if(l==0){
if(requestlength > 0 ){
for(int i=0;i<requestlength;i++){
int c = in.read();
if(c==-1)break;
l++;
else if(l==2)
out.write(rankstring);
System.out.println("l value is" + l);
public void doGet(HttpServletRequest req, HttpServletResponse res) throws IOException,ServletException{
doPost(req,res);
how do i get around this problem?advice will be greatly appreciated
regards

i think you want to number of hits kind of value...
make that variable static
you should get the value that you want
[email protected]

Servlet intercommunication problem

Hi,
I have a problem regarding servlet intercommunication.
What I m doing is : I have an HTML form in which user enters some data and submits it. Servlet_1 is called , it gets all the parameters and displays all data in the form of an html form again. Now, if the user clicks on "SAVE" button , only then Servlet_2 should get called and that data should be stored in database .
I m having problem while saving data.I just lose track of data entered by the user somewhere between the servlets.
How should I get the data enetered by the user previously, and in what form I should store it to access it later on through any servlet?
Please help.
Regards
Shweta

I suggest other than showing the data on the HTML returned by Servlet_1, you created hidden values of the data submitted into the displayed form. In this way, the data would be resent to Servlet_2 when Save is pressed.
Alternatively, you can use a Session to store the contents of the submitted information. (this will enable you to access it later on any servlet)

Servlet RequestDispatch problem

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