Invoking servlets in tomcat 4.1

Hi..
Regarding servlets and jsp i have some basic questions
1. how to compile servelts , either with j2ee.jar of j2sdkee or servlet.jar of tomcat.
2. where do i need to set the classpath, means either in environmnet variable or autoexec.bat or both, HOW TO SET THE CLASSPATH
3. after successful compilation where to place the soruce code and class file, the exact location
4. do i need to write my own web.xml file or do i need to modify the existing one, which one.
5. what is the url i need to type in my browser.
help will be appricated
thanks in advance

3. after successful compilation where to place the
soruce code and class file, the exact locationAfter compilation, you don't need your source code. Class files should be placed in WEB-INF/classes, in their package folder.
4. do i need to write my own web.xml file or do i need
to modify the existing one, which one.
If you write support classes (beans), you do not need to modify web.xml. If you write servlets, you need to modify your WEB-INF/web.xml file to map your servlet to your class:
    <servlet>
        <servlet-name>SomeServlet</servlet-name>
        <servlet-class>something.or.other.SomeServlet</servlet-class>
    </servlet>
   <servlet-mapping>
     <servlet-name>SomeServlet</servlet-name>
     <url-pattern>/servlet/SomeServlet</url-pattern>
   </servlet-mapping>
5. what is the url i need to type in my browser.
From example above: http://localhost:8080/servlet/SomeServlet or http://localhost:8080/your.jsp, assuming Tomcat runs on port 8080 and that you put your file under the ROOT context.
>
help will be appricated
I think you should take a look at ant (http://ant.jakarta.org). It can help you automate most steps, from compiling, to copying files and making .war files.
Hope this helps!
Patrick

Similar Messages

Error 404 invoking servlet in tomcat

OK Im new in this and I have searched the forums and do most of the answers but I cant make my servlet to work. So here is how I have my structure
MEDEX \ WEB-INF -> all JSP files
MEDEX \ WEB-INF \ classes -> all CLASS files
MEDEX \ WEB-INF \ servlet -> SERVLET CLASS FILE
I have a page called index.jsp that invokes the servlet by a form like this:
<form name="form1" method="post" action="http:\\localhost:80\Medex\WEB-INF\servlet">
this is what I have in my web.xml
<display-name>Servlet SvMedex</display-name>
<servlet>
<servlet-name>SvMedex</servlet-name>
<servlet-class>SvMedex</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>SvMedex</servlet-name>
<url-pattern>http:\\localhost:80\Medex\WEB-INF\servlet</url-pattern>
</servlet-mapping>
<-- <resource-ref>
<res-ref-name>http:\\localhost:80\Medex\WEB-INF\bd</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>-->
</web-app>
I dont have a server.xml since I edited the server.xml in tomcat/conf to evoke anonimous servlets... that will be while I test
PLease IM DESPERATE ! any help is really appreciated.

<url-pattern>http:\\localhost:80\Medex\WEB-INF\servle
t</url-pattern>URL patterns are specified relative to the webapp. If you use a url-pattern of /SvMedex, your servlet will be available at http://localhost:80/Medex/SvMedex

How to configure applet/servlet in Tomcat?

I'm building a web application which is going to be deployed in Tomcat. I have an applet(called MYAPPLET here) which "calls" a servlet(called MYSERVLET here). I cannot figure out how to configure the whole thing.
/test is my docbase. In /test I made a directory "applet classes" and a directory "servlet". The applet tag I use in the HTML file looks like this:
<applet
code="MYAPPLET.class"
codebase="http://localhost:8080/test/applet classes/"

<param
name="servlet"
value="http://localhost:8080/test/servlet/MYSERVLET" />
</applet>
Now, when opening the page, the applet can be found but Tomcat gives an error 404 saying that it can not find the servlet. On the other hand, If I make an entry in my web.xml (with url mapping
<url-pattern>/test </url-pattern> or <url-pattern>/test/servlet </url-pattern>, depending on where I put MYSERVLET)
for the servlet mentioned above and I put the MYSERVLET in either the WEB-INF/classes directory or in /test/servlet Tomcat gives an error 403. It refuses to connect to the servlet!
Please can anyone help me. THanx in advance
debeumers

You are configuring Tomcat and if you have further questions then post new questions in the forum "Java Servlet Technology".
Given that your servlet url is "localhost:8080/test/servlet/MyServlet"
This assumes -
1) You have created a web application called "test". You have a directory called "test" under- $CATALINA_HOME/webapps
2) Your html files, jsp files, and subdirectory "applet-classes" (Note - do Not use spaces when naming directories) exist in this top level directory of your web app. If you choose to place your applet classes in this subdir then the codebase can be "applet-classes" - omitting the "/" means this directory is located relative to the current directory of the html file. (No jar files? No archive param then..)
3) You have a class file called "MyServlet" located - $CATALINA_HOME/webapps/test/WEB-INF/classes
Some versions of Tomcat require you to uncomment out the area of the Mapping for the Invoker Servlet element in $CAT_HOME/conf/web.xml.
<servlet-name>invoker</servlet-name>
<url-mapping>/servlet/*</url-mapping>
Once this is done, you need not create a directory called "servlet" anywhere in your structure. It is the url mapping.
You will want to apply url-patterns and mappings to your application specific web.xml (This is located in - $C_H/webapps/test/WEB-INF) when it comes time to deploy the app, but that is not required for testing and development. You need not make changes to the app specific web.xml at this time just to get the servlet to run.
And finally I suggest you read a book on this subject...

Deploying a servlet in tomcat 5.0

I install tomcat 5.0 in my pc
I can run HelloWorldExample in browser using the following URL:
http://localhost:8080/servlets-examples/servlet/HelloWorldExample
I copy the HelloWorldExample.class into folder :
C:\Program Files\Apache Software Foundation\Tomcat 5.0\webapps\ROOT\WEB-INF\classes
I also change the web.xml (path -- C:\Program Files\Apache Software Foundation\Tomcat 5.0\webapps\ROOT\WEB-INF)to include the following:
<servlet>
<servlet-name>org.apache.jsp.index_jsp</servlet-name>
<servlet-class>org.apache.jsp.index_jsp</servlet-class>
</servlet>
<servlet>
<servlet-name>HelloWorldExample</servlet-name>
<servlet-class>HelloWorldExample</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>org.apache.jsp.index_jsp</servlet-name>
<url-pattern>/index.jsp</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>HelloWorldExample</servlet-name>
<url-pattern>/HelloWorldExample</url-pattern>
</servlet-mapping>
but when I type http://localhost:8080/servlet/HelloWorldExample I go an error 404 The requested resource/servlet/HelloWorldExample) is not available.
I set the JAVA_HOME to j2sdk folder C:\j2sdk1.4.2_04\
Am I missing sth in classpath?
And in tomcat 5.0, it is a must to specify all servlet in web.xml?
Is there any way I just copy the class into the folder and no need to specify the name in web.xml?
Thank you in advance!

Hi there,
actually I can run the example servlet by:
http://localhost:8080/servlets-examples/servlet/HelloWorldExample
today I change the web.xml in conf folder, I enable the following lines which are originally remarked:
(original line 90 to 102)
<servlet>
<servlet-name>invoker</servlet-name>
<servlet-class>
org.apache.catalina.servlets.InvokerServlet
</servlet-class>
<init-param>
<param-name>debug</param-name>
<param-value>0</param-value>
</init-param>
<load-on-startup>2</load-on-startup>
</servlet>
(original line 319 to 324)
<servlet-mapping>
<servlet-name>invoker</servlet-name>
<url-pattern>/servlet/*</url-pattern>
</servlet-mapping>
then I have the following error when I type:
HTTP Status 500
java.util.MissingResourceException: Can't find bundle for base name LocalStrings, locale zh_TW
     java.util.ResourceBundle.throwMissingResourceException(Unknown Source)
     java.util.ResourceBundle.getBundleImpl(Unknown Source)
     java.util.ResourceBundle.getBundle(Unknown Source)
     HelloWorldExample.doGet(HelloWorldExample.java:39)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:697)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
     org.apache.catalina.servlets.InvokerServlet.serveRequest(InvokerServlet.java:419)
     org.apache.catalina.servlets.InvokerServlet.doGet(InvokerServlet.java:133)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:697)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
what should I do?
Thank you!

Servlets and Tomcat/Apache

Okay,
Tomcat 4.1 running with Apache.
Installed mod_jk, piece of cake.
JSPs run through Apache like a dream.
Tomcat examples ( jsp and servlets) run through Apache perfectly ( that is no :8080 business).
My JSP's run through Apache no problem. Works great.
My SERVLETS WILL NOT RUN THROUGH APACHE FOR ANYTHING.
My context looks like this in server.xml:
<Context path="/nuweb" docBase="/home/shared/nuweb" debug="0"
reloadable="true" crossContext="true">
<Logger className="org.apache.catalina.logger.FileLogger"
prefix="nuweb" suffix=".log"
timestamp="true"/>
</Context>
Note: that I am not under <TOMCAT_HOME>/webapps.
The reason is that I will, in production not be the Unix admin on the server. I will only have priviledges within my directory. I will not be able to drop war files in the webapps directory. I will not be able
to start and stop tomcat or apache ( there are 100 diffrent apache contexts on that machine and someday many of them will be going through tomcat for jsp and servlet support).
My servlets will only run if I put :8080/nuweb/servlet/HelloServlet in the URL. Take off the 8080 and I get Page not found. Not the tomcat 404 page, the Browswer 404 errror.
Here is my web.xml which lives in the WEB-INF directory of of /home/shared/nuweb
<?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>
<servlet>
<servlet-name>HelloServlet</servlet-name>
<servlet-class>org.nu.servlet.HelloServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>HelloServlet</servlet-name>
<url-pattern>/hello</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>invoker</servlet-name>
<url-pattern>/servlet/*</url-pattern>
</servlet-mapping>
</web-app>
In devlopment I am on a system that is very close to what the production server will look like ( Tomcat 4.1 same version of Apache, same Unix ). In development I can restart all the servers edit server.xml etc. On the production I would have to schedule that stuff. I want to be able to compile classes and drop them in the WEB-INF/classes... directory and have them run. Is that too much to ask?

Hi,
I am also facing same error.
I am not able to view my servlets via apache web server.
ie when i do "http://localhost/enlighta/logon"
I get http 404 page not found error
but when I do http://localhost:8080/enlighta/logon
all works fine
I am using apache 2 and tomcat 4.5
This is I have done:
1.I have http server running on port 80
2. appserver on port 8080
3. I have a war file enlighta.war deployed on webserevr
4. The static content like images and html page I have moved to webserver
5. The servlet context of the app on the app server is /enlighta
6. In the web.xml I have defined all the servlet maping.
the port 8009 has the connecter is running/listening.
the configuration
sever.xml on tomcat

<Connector port="8009"
enableLookups="false" redirectPort="8443" protocol="AJP/1.3" />
<Host name="localhost" appBase="webapps"
unpackWARs="true" autoDeploy="true"
xmlValidation="false" xmlNamespaceAware="false">
httpd.conf on apache
# Load mod_jk
LoadModule jk_module modules/mod_jk.so
# Configure mod_jk
JkWorkersFile conf/workers.properties
JkLogFile logs/mod_jk.log
JkLogLevel info
# First Virtual Host.
<VirtualHost 192.168.1.2:8080>
ServerAdmin [email protected]
DocumentRoot /enlighta/
ServerName localhost
ErrorLog logs/enlighta_error_log
TransferLog logs/enlighta_access_log
JkMount /enlighta/* ajp13
</VirtualHost>
workers.properties
worker.list=ajp13
# Defining a worker named ajp13w and of type ajp13
# Note that the name and the type do not have to match.
worker.ajp13.type=ajp13
worker.ajp13.host=localhost
worker.ajp13.port=8009
Now I feel I am doing something wrong on defining virtual host.
Or may be something else is wrong.
I have gone thru the previous thread but I dont have mod_jk.conf file.
Please help!!!
Thanks
Sachin

Cannot run a servlet using Tomcat. Urgent

I have a webapplication which uses some jsp's and servlets. The jsp pages work fine when I use
http://hostname:8080/MyWebapp/Filename.jsp
However, when I developed a java servlet and put the class file in WEB-INF/classes directory of my web application and tried to access it.
I got a resource not found error.
The strange thing is that when I put the file in the web-inf/classes folder of examples webapplication (which comes with Tomcat) I am able to run the servlet using
http://hostname:8080/examples/servlet/Class file
I am not sure what is wrong.
Can someone help me.
Thanks in advance
Vamsi.

It's predictable. The Servlet and JSP specifications mandate that you cannot directly access resources under WEB-INF directory. You have to set up servlet mapping configuration in your web.xml to specify how to access the resources, both Servlet and JSP, there.
When you copied your files in a demo webapp of Tomcat, the web.xml of the demo app already set up the mapping like following for you. So you could use http://hostname:8080/examples/servlet/Class to visit the servlet.
<servlet-mapping>
<servlet-name>invoker</servlet-name>
<url-pattern>/servlet/*</url-pattern>
</servlet-mapping>
The default setting since Tomcat 4.1 turned off servlet invoker in web.xml under conf directory. You can uncomment the above lines in this file to turn it on. Then you are able to visit your servlet without <servlet-mapping> configured using the following syntax,
http://hostname:8080/<your_app_name>/servlet/<your_servlet_name>

Just can't run HELLOWORLD servlet on Tomcat!

Hi there, I worked with servlets all summer long and now I'm getting back to build one, and I'm totally confused... My problem's there :
I try to run a simple HelloWorld servlet on Tomcat 4.1, and I get a 404 Error - Not found
Well, here's the structure of my web application, contained in simpleservlet.war :
WEB-APP
-web.xml
-CLASSES
-servlet.class
-LIB
-servlet.jar
Here's now the content of the web.xml file :
<web-app>
     <servlet>
          <servlet-name>serv</servlet-name>
          <servlet-class>servlet</servlet-class>
     </servlet>
     <servlet-mapping>
          <servlet-name>serv</servlet-name>
          <url-pattern>/test</url-pattern>
     </servlet-mapping>
</web-app>
AND FINALLY here's how I invoke my servlet, I TRIED :
http://localhost:1977/servlet/test
AND ALSO
http://localhost:1977/test
AND BANG, I GET "ERROR 404 - NOT FOUND"
A little help would be appreciated A LOT, well it's not supposed to be a hard problem... and by the way, I'm using port :1977, the problem's not there though.
regards, Pierre

Hi,
First try http://localhost:1977 and see if you are getting Tomcat. As you said, this is not a problem. So, you should get the index.html of the Tomcat. Now, click on the one of the example. From the Address Bar, you will know the path of this example. Try putting your page at that location and then run.
This should work.
-- Ashish.

Invoker servlet

Hi,
I am interested in knowing why we should avoid invoker servlets?
what are short comings of invoker servlet?
( Yes for invoker servlets completer path up to servlet is to be given)
Thanks

The Invoker servlet is a built int servlet mapped such that allows you to invoke any servlet by using the URL: /servletPackage/servletClassName. While this is good to get started and to know, you should never use it in a production environment.
If you give password protected access to a folder, say Employees and map a servlet to /Employees/MyServlet, the servlet is also protected. Only people with the authorized username/password combinations can run the servlet. But if you allow the default mapping with the Invoker servlet, then the same servlet will also be accessible to everyone as /servlet/MyServlet in which case your authorization fails and everyone has access to your servlet's functionality, potentially modifying data etc.
This is only the authorization aspect. Other than this, the Invoker servlet makes it hard for you to hide your actual package/ classnames. Other features like init parameters and filters are also not possible in this case.
This is why you should NOT use the Invoker servlet. Even the Tomcat FAQ says you should not.
Read more here:
[1] http://faq.javaranch.com/view?InvokerServlet
[2] http://jakarta.apache.org/tomcat/faq/misc.html#evil
P.S. a_joseph also had a valid point and he gave you the same link also.
People on the forum help others voluntarily, it's not their job.
Help them help you.
Learn how to ask questions first: http://www.catb.org/~esr/faqs/smart-questions.html
----------------------------------------------------------------

How to run a servlet in tomcat 5.0.

Hi all,
how to run a servlet in tomcat 5.0
please tell me the entire procedure....(directory structure)
step by step....

hi :-)
http://java.sun.com/j2ee/tutorial/1_3-fcs/doc/Servlets.html
or
http://www.google.com.ph/search?hl=en&q=java+servlet+tutorial&btnG=Google+Search&meta=
regards,

Servlet on tomcat 4.1.18

I am facing a problem of running servlets on Tomcat 4.1.18. The problem seems to be in the configuration. In the webapps folder, I created a folder greeting. In that, the WEB-Inf\classes folder has GreetingServlet.class.
webapp\greeting has index.html that has to FORM ACTION set to /greeting/servlet/GreetingServlet.
On clicking the submit button the message I get is that the resource /greeting/servlet/GreetingServlet is not found.
Can anybody help in configuring the server so that the above mentioned servlet gets recognized?
Thanks.
Amitabh.
[email protected]

My application is located at %TOMCAT_HOME%\webapps.
%TOMCAT_HOME%\webapps\greeting\WEB-INF\web.xml has the following:
<web-app>
<servlet>
<servlet-name>greeting</servlet-name>
<servlet-class>GreetingServlet</servlet-class>
</servlet>
</web-app>
%TOMCAT_HOME%\webapps\greeting\index.html has the following:
<FORM ACTION="/greeting/servlet/GreetingServlet" METHOD="POST">
<P> Your name <INPUT TYPE="text" SIZE="40" NAME="name"></P>
</FORM>
Yet the problem persists.
Have I missed some point?
Help/assistance will be appreciated.
Thanks.
Amitabh.
[email protected]

Servlets in Tomcat

I am trying to run servlets using Tomcat. I have them working and displaying but as soon as I make a change to a servelt and re-compile and refresh the browser the change do not take effect. I have to shutdown and restart tocat. Surely this can't be right. can anyone help with correcting this problem?

Lesta,
For convenience there's a Tomcat admin console. The admin console runs through a web browser and allows you to restart an application, restart a context ect. I think you can also install or reinstall entire ears through it now.
There's some setup to do before you can use the admin console. I seem to remember there being an XML user/password file somewhere...
In a production environment you don't want to shutdown and restart the daemon like you are doing. It will just annoy the heck out of your users.
Hope this helps.
-Bryan

Need to enable autoreload feature for servlet in Tomcat

Hello
I wants to enable autoreload feature for servlet in tomcat so that i need not to stop tomcat 4.0 web server again and again
Thanks

http://jakarta.apache.org/tomcat/tomcat-4.1-doc/config/context.html
It is amazing what reading the manual might do for ya.

How to run Servlet in TOMCAT

I am new to Java Servlets. I am trying to run a servlet on TOMCAT but I don't know where to place my Servlet class file. TOMCAT works ok with sample jar file. Please guide.
-- HTML code
<HTML>
<HEAD>
<TITLE> Request Object </TITLE>
</HEAD>
<BODY>
<FORM METHOD="POST" ACTION="/servlet/WelcomeServlet">
Enter your Name: <INPUT TYPE=TEXT NAME="myName">
<INPUT TYPE="SUBMIT" VALUE="Send Name">
</FORM>
</BODY>
</HTML>
-- Servlet Code
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
public class WelcomeServlet extends HttpServlet {
public void doPost(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
String Name = request.getParameter("myName");
PrintWriter out = response.getWriter();
String mName = "test";
try {
mName = gName("AAA","VVV");
catch (SQLException ex)
out.println("SQLException");
out.println("Welcome 1.1 " + Name + " !" + " mName " + mName);
public String gName(String inputUserid, String inputPwd)
throws SQLException{
String vname = "Test";
return vname;
thanks
Vineet

I have Tomcat version 4.0 installed on my machine. If you look at the directory where you have Tomcat installed, you should find the directory structure:
tomcat-folder/webapps/root/web-inf/classes
Try placing your class files in the classes folder.

How to Run servlet in Tomcat 5.5.9

hi
How to run servlet in tomcat 5.5.9?how to set context path in server.xml of conf folder in tomcat since there is no context tag in server.xml.
Jiten

Hi ! I have a similar problem, well, it's along the same line ...
I'm using NetBeans 4.1, and i've coded a servlet. Using NetBeans to launch my servlet (with the bundled Tomcat 5.5.7) works fine, however i need to deploy my application unto a Tomcat 5.5.9 server.
Thus, i copied the WAR file generated by NetBeans into the Tomcat 5.5.9 webapps directory, and Tomcat expands it.
Problem is when i run my JSP pages with the form tags, they do not work on the Tomcat 5.5.9 environment. Anyone knows why?
(These work on the NetBeans Tomcat bundle 5.5.7)
My form action :
<form name="index" method="get" action="PageServlet">
My web.xml :
<servlet>
<servlet-name>PageServlet</servlet-name>
<servlet-class>application.PageServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>PageServlet</servlet-name>
<url-pattern>/PageServlet</url-pattern>
</servlet-mapping>
I'm really stumbed on why it doesn't work in Tomcat 5.5.9, any help is greatly appreciated, thanks in advance ^_^

How to run Servlet in Tomcat 5.5.7 Server

Hi,
How to run Servlet in Tomcat 5.5.7 Server. I mean where I should copy my *.class file.
Thanks in Advance.
bbye.

In order to complile the servlet you need to tell java where to find the servlet libary (as stated above by setting the class path). or (much easier IMO)
copy the servlet-api.jar to
JavaInstallDirectory\jre\lib\ext

Invoking servlets in tomcat 4.1

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