Deploying Web Applications to Tomcat

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Deploying Web Applications to Tomcat
Pages: 1, 2, 3, 4, 5

To complete your deployment, copy the compiled tag library and the taglib.tld into the TOMCAT_ROOT/onjava/WEB-INF/lib directory.

To test you new tag library, you need to modify the welcome.jsp page, replacing the Welcome message with a reference to the <onjava:hello /> tag. You need to also add a taglib directive referencing the taglib.tld to the welcome.jsp file. The modified JSP is in Listing 7.

Listing 7 Modified welcome.jsp

<%@ taglib uri="/onjava" prefix="onjava" %> <html> <head> <title>Onjava Demo</title> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> </head> <table width="500" border="0" cellspacing="0" cellpadding="0"> <tr> <td> </td> </tr> <tr> <td> <img src="/onjava/images/monitor2.gif"></td> <td> <b><onjava:hello /> : <%= request.getAttribute("USER") %></b> </td> </tr> <tr> <td> </td> </tr> </table> </body> </html>

Now open the login.jsp page as described previously and run through the demo again. This time instead of Welcome: Bob, you should see the message Hello: Bob.

Creating and Deploying a WAR File

When your web application is ready for deployment, you need to package it for distribution. As we discussed previously in Java Web Applications, web applications are packaged in WAR files. The steps required to "WAR-up" your /onjava web application and deploy it are as follows:

Change to the root directory of your web application. In this case the root directory would be TOMCAT_HOME/webapps/onjava/.
Archive the web application:
```
jar cvf onjava.war .
```
Copy the resulting WAR file, onjava.war, to the TOMCAT_HOME/webapps directory.

If you're deploying this WAR file to the Tomcat installation that you were developing in, then you will need to back up your development directory and remove it from the TOMCAT_HOME/webapps directory.
Add a new Context entry to the /TOMCAT_HOME/conf/server.xml file, referencing the onjava web application.
Restart Tomcat.

That's it. Your application should now be deployed and running. If it isn't, check your entry in the TOMCAT_HOME/conf/server.xml file to ensure that you have set the appropriate values.

Now that you know how to create and deploy a web applications, we'll examine the relationship of the web application and its ServletContext in a future article.

James Goodwill is the co-Founder of Virtuas Solutions, LLC, a Colorado-based software consultancy.

Read more Using Tomcat columns.

Return to ONJava.com.

Comments on this article

Showing messages 1 through 132 of 132.

HTTP Status 404 - /openipmp/jsp/login.jsp
2009-02-05 01:07:18 geetha123 [View]

Dear friends,
Good afternoon.
I need a help.
I am trying to install an open source DRM server in my system.
Here they are using Tomcat.
To access the DRM server we are using JBOSS Application server.After installation I am trying to acccess the server by

http://localhost:8080/openipmp/jsp/login.jsp.

But its giving error message

"
HTTP Status 404 - /openipmp/jsp/login.jsp

type Status report

message /openipmp/jsp/login.jsp

description The requested resource (/openipmp/jsp/login.jsp) is not available.
Apache Tomcat/5.5.9

"

If anyone is having any idea to resolve this problem, please share it.

Thanking you in advance..

with regards,
GK

inserting data
2008-02-20 21:52:25 kushal_miet [View]

hi can you help me soon i am inserting the data to my tabel with the help of servlet as a registration page .

unable to open the welcome page http://localhost:8080/
2006-11-28 02:34:32 bsandip [View]

hi, I'm sandip, I have instaaled tomcat v5.5.8 on windows Xp, but when i tried to open the tomcat welcome page http:/localhost:8080/.. it says the page cannot be displayed. i have done everything from confiuration of tomcat and setting the PATH and JAVA_PATH variables.... but the problem remained unsolved.....I"m trying on tomcat from last 3 weeks...please give me any suggetions so that i can continue my programing work...My pc doesnot have any inetrnet connection...Please try to find some answers...I'm in very desperate conditions...thanks

unable to open the welcome page http://localhost:8080/
2007-11-01 23:46:55 MChat [View]

Add a new environment variable "CATALINA_HOME".
If your tomcat is located in c:\tomcat then CATALINA_HOME=c:\tomcat and add %CATALINA_HOME%\bin to path.

Please help as soon as possible
2006-11-22 22:12:18 Abilash_Salvaji [View]

Iam working in linux environment where i have a web application which is converted in to jar file first which later is converted into a war file when i deployed this war file in my tomcat server and calling the context path it is showing the listing directory which has nothing in it. my application has worked properly when it was is in a directory format. but after converting it into a war file i get this message. before converting my directory in to a war file its size is 2.3gb where after converting it into jar file it is only 1.26mb which later after converting it into war file its size is only 258kb. is there anything that went wrong while creating a jar /.war file. please help me soon

Deployment Guide
2006-05-03 03:34:29 Raj31 [View]

This is very good article Can you suggest where is the next article that is relationship between WebApplication and servletContext

Deployment Guide
2007-12-12 07:30:20 padla [View]

A few tips for the Suse newbies...
2006-03-08 21:13:58 DoctorSuse [View]

THIS IS FOR SUSE 9.1 USERS

Installation:
CSFalcon has alot of good tips on the installation of JDK and Tomcat (get the latest stable versions)

Configuration:
In the /etc folder you should have a file named profile.local. If not create one. This is where you will store environment variables. Use VI editor from the shell while logged in as root to create this file.

Sample profile.local

# Java SDK Path
export JAVA_HOME=/usr/java/jdk1.5.0_06/
export PATH=$PATH:$JAVA_HOME/bin/
# Tomcat Path
export TOMCAT_HOME=/usr/tomcat/jakarta-tomcat-5.0.28
export PATH=$PATH:$TOMCAT_HOME/bin/
# Eclipse Path
export PATH=$PATH:/usr/eclipse
# Alias for Tomcat
alias tom='cd /usr/tomcat/jakarta-tomcat-5.0.28'
# Set CLASSPATH for Jars, etc.
CLASSPATH=$JAVA_HOME/jre/lib
CLASSPATH=$CLASSPATH:/usr/tomcat/jakarta-tomcat-5.0.28/common/lib
CLASSPATH=$CLASSPATH:/usr/tomcat/jakarta-tomcat-5.0.28/common/lib/servlet-api.jar
export CLASSPATH

source profile.local at the prompt to activate these settings. Once you do this everything will fall into place in the tutorial.

TIP! Use the onjava_logo.jpg for your image. Just do a save as on the Tiger and create an images folder under onjava in your Webapps folder.

TIP! Whatever you do, if you have Tomcat 5.x, DO NOT TOUCH the Server.xml file which the instructions tells you to do to setup your Servlet Context. This instruction may have worked for earlier versions of Tomcat, but beware that things change.

TIP! Make sure Network Services are enabled for all services in YaST. I forgot this once and it was days before it occurred to me.

TIP! When you save your files (jsp, xml, etc.) make sure the extension is correct. A common newbie mistake is to have .txt on the end and of course that doesn't work!

TIP! The alias 'tom' in profile.local above makes it possible to go directly to the full path of tomcat with three keystrokes when you're shelling!

TIP! In the case of ONJAVA, you will build a folder structure as follows:

/webapps/onjava/WEB-INF/classes/com/onjava

So under the existing WEB-INF/classes, you should create a COM folder and under that another ONJAVA folder (lowercase for both of these).

Your servlet, login.java will go in this folder.

MAJOR TIP!
This is where to place the Context path:
/usr/tomcat/jakarta-tomcat-5.0.28/conf/Catalina/localhost/onjava.xml

This is a listing of the file:
<Context path="/onjava" docBase="onjava" debug="0" reloadable="true">

</Context>

MAJOR TIP!
This is where to place the Servlet and Servlet mapping:
/usr/tomcat/jakarta-tomcat-5.0.28/webapps/onjava/WEB-INF/web.xml

This is a listing of the file:
<?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/dtd/web-app_2_3.dtd">

<web-app>



<servlet>
<servlet-name>MyServlet</servlet-name>
<servlet-class>com.onjava.login</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>MyServlet</servlet-name>
<url-pattern>/servlet/com.onjava.login</url-pattern>
</servlet-mapping>

</web-app>

ANY QUESTIONS?!?

DR. SUSE

404 error in tomcat logs
2005-10-15 12:00:19 prathibha_10 [View]

Hi,

I have tomcat running and my web application deployed. I initally set up the necessary directories for developing my web app and later on 'war'ed up my web application, removed the development directories and deployed the WAR file on the server as mentioned in this web site.

My servlet is supposed to receive an incoming file and save it and send an acknowledgement messgage back to the client. This works perfectly. However, each time the URL is called by the client, the tomcat logs show a 404 error as below which is worrying me:

2005-10-13 04:10:20 - Ctx( ): 404 R( + * + null) null

This is the only problem I have, as I mentioend before the web application works perfectly, but everytime it is called, the above message is logged in the tomcat.log file. This looks different from the other 404 errors that I have encountered where the URL in the error gave me a clue to what was wrong. Here the error messgae just has an '*' in it, the client locates the servlet and everything works fine, I tried deploying the servlet on a test machine and the logs don't show the error but when I deploy it on the production machine, the logs show the 404 error though everything works fine.

Can anyone tell me why? Is this is a harmless message that I can suppress in the logs or is it going to cause big problems later? I am running out of time to fix this and would really appreciate if someone has some good input on this.

Thanks,
Prathibha.

please help HTTP Status 404 - /onjava/servlet/login
2005-09-16 05:43:36 klammer [View]

i did everything as written in the tutorial

additional i went through the numerous comments

and corrected also the following parts:

1) WEB_INF instead of WEB-INF
2) uncomment the invoker in conf/web.xml
3) specify the form action as "/onjava/servlet/...."
4) changed the web.xml to
<web-app>
<servlet>
<servlet-name>login</servlet-name>
<servlet-class>com.onjava.login</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>login</servlet-name>
<url-pattern>/servlet/*</url-pattern>
</servlet-mapping>

BUT still i do get the following error after trying login on http://localhost:8080/onjava/login.jsp

i use tomcat 4.1.30

please please please help me.... i'm trying over hours...

------------

HTTP Status 404 - /onjava/servlet/login

--------------------------------------------------------------------------------

type Status report

message /onjava/servlet/login

description The requested resource (/onjava/servlet/login) is not available.

--------------------------------------------------------------------------------

Apache Tomcat/4.1.30

please help HTTP Status 404 - /onjava/servlet/login
2007-02-01 00:46:14 bashask [View]

Subject: please help HTTP Status 404 - /onjava/servlet/login
Date: 2007-02-01
From: bashask

--------------------------------------------------------------------------------

i did everything as written in the tutorial

BUT still i do get the following error after trying login on http://localhost:8080/onjava/login.jsp

i use tomcat 4.1.30

please help me.... i'm trying over hours...

------------

HTTP Status 404 - /onjava/servlet/login

--------------------------------------------------------------------------------

type Status report

message /onjava/servlet/login

description The requested resource (/onjava/servlet/login) is not available.

--------------------------------------------------------------------------------

Apache Tomcat/4.1.30

please help HTTP Status 404 - /onjava/servlet/login
2006-03-29 08:29:22 vikasnagpal [View]

Using Bean in JSP with Tomcat
2004-12-15 01:30:35 Avijit_Dutta [View]

Sir,

I am new to JSP. I am O.K. with simple JSP. I am keeping my JSP files in /webapps/MyJsps of Tomcat 5. But I am not sure where to keep my bean class. A simple example will be highly appreciated.

Regards,

Avijit Dutta

Using Bean in JSP with Tomcat
2005-03-27 22:42:13 noopuram2004 [View]

PLACE THE BEAN PACKAGE IN webapps\ROOT\WEB-INF\CLASSES FOLDER. PLACE U'R JSP FILE IN THE SAME FOLDER AS U DO PREVIOUSLY.

Using Bean in JSP with Tomcat
2005-02-21 02:52:00 sachetsharma [View]

Hi,
I'm also facing same problem as u, so pls mail me if u get proper solution. sachetsharma@rediffmail.com

Facing Problem as the servlet is not being Loaded
2004-12-01 02:05:53 DeeptiChhabra [View]

I have follwed each and every step that described in the article. When i enter the username and the password and click on the submit button, i get the following error.

HTTP Status 404 - /onjava/onjava/servlet/com/onjava/login

--------------------------------------------------------------------------------

type Status report

message /onjava/onjava/servlet/com/onjava/login

description The requested resource (/onjava/onjava/servlet/com/onjava/login) is not available.
--------------------------------------------------------------------------------
Apache Tomcat/5.0.25

Even the web.xml has both the entries for <servlet> and <servlet-mapping>.

<web-app>
<servlet>
<servlet-name>login</servlet-name>
<servlet-class>com.onjava.login</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>login</servlet-name>
<url-pattern>/servlet/login</url-pattern>
</servlet-mapping>
</web-app>

Please let me know where am i making mistake.
Help would be highly appreciated.

Regards,
Deepti Chhabra

Facing Problem as the servlet is not being Loaded
2006-09-16 07:35:34 Vish_DEL [View]

Make the change in login.jsp as

<form name="loginForm" method="post" action="servlet/login">

It will work sure....

HELP!!! Error: The requested resource /onjava/login.jsp) is not available.
2004-09-02 03:29:19 Kav [View]

hi,im new to using tomcat can anyone help..
Ive on the 2 page of following the instructions on the example: Deploying Web Applications to Tomcat.

Ive added everything according to the instructions, but when i go the url to test whether or not i can see the login.jsp:
http://localhost:8080/onjava/login.jsp

I get the following browser error:
HTTP Status 404 - /onjava/login.jsp
Status report

message /onjava/login.jsp

description The requested resource /onjava/login.jsp) is not available.

Can anyone help and let me know what im doing wrong.

HELP!!! Error: The requested resource /onjava/login.jsp) is not available.
2005-04-02 20:25:56 GoTarheels [View]

Try this for your servlet-mapping. There is a small difference. I struggled with this myself for weeks and finally looked at one of the examples and trial and error - - it worked.

<web-app>
<servlet>
<servlet-name>login</servlet-name>
<servlet-class>com.onjava.login</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>login</servlet-name>
<url-pattern>/servlet/com.onjava.login</url-pattern>
</servlet-mapping>
</web-app>

HELP!!! Error: The requested resource /onjava/login.jsp) is not available.
2006-10-06 04:14:20 kapild [View]

thnx .... this helped me alot

HELP!!! Error: The requested resource /onjava/login.jsp) is not available.
2005-03-07 00:47:42 trahul [View]

HELP!!! Error: The requested resource /onjava/login.jsp) is not available.
2004-10-13 03:54:46 Yaniv [View]

Hi i have the same problem
u need to update the context to reference the war file
exmample:
<Context path="/onjava" docBase="onjava/onjava.war"
debug="0" privileged="true">

</Context>

good luck

Problem with War file
2004-08-21 04:49:42 ManjayDwivedi [View]

I have create .war file and put it to webaapps folder made changes as per instruction but it's showing me following Error
--------------------------------------------------
HTTP Status 404 - /onjava/

--------------------------------------------------------------------------------

type Status report

message /onjava/

description The requested resource (/onjava/) is not available.

--------------------------------------------------------------------------------

Apache Tomcat/4.1.18
--------------------------------------------------

Help is required!!!!!!

Regards

Manjay

login.jsp output
2004-08-21 00:37:38 ManjayDwivedi [View]

When i'm entering unser name and password and click on submit Buttton it's show me.

------------------------------------------
HTTP Status 404 - /onjava/onjava/servlet/com.onjava.login

--------------------------------------------------------------------------------

type Status report

message /onjava/onjava/servlet/com.onjava.login

description The requested resource (/onjava/onjava/servlet/com.onjava.login) is not available.

--------------------------------------------------------------------------------

Apache Tomcat/4.1.18

-------------------------------------------
I have followed each and every intstruection of Article please Rectify this Problem.

Thanks in Adv..

Regards
Manjay Dwivedi

Problem in tag libraries
2004-06-15 03:46:15 gts [View]

I have tried all the tips. All of it workded
well except the Adding Tag Libraries section.
When i try to access the welcome.jsp i got an
exception 'org.apache.jasper.JasperException: Unable to compile class for JSP'
I had copy the $JAVA_HOME/lib/tools.jar from the JDK
to the common/lib of tomcat. But the same problem existing

plz reply soon
2004-06-03 13:09:14 iprincecharming [View]

i am new to tomcat. i have installed tomcat 4.1.3. i loved ur description. but i have a problem. i have done everything as per given. but i get an error that

HTTP Status 404 - /onjava/login.jsp
--------------

type Status report

message /onjava/login.jsp

description The requested resource (/onjava/login.jsp) is not available.

i think i have placed the
<Context path="/onjava" docBase="onjava" debug="0" reloadable="true" />
on wrong line. will u plz tell where to place this line specifically. now my login.jsp page is even not being showed. it is in tomcat>>onjava folder as mentioned. plz reply urgently.
thanks

Path problems
2003-12-23 22:30:24 anonymous2 [View]

Hi,
I have tried to follow all the tips here on how to add mapping in the web.xml and uncomment the server.xml invoker mapping. But the servlet is not being loaded - how do I check what is happening.
BTW - I do not have a servlet directory and the path is under webapps/onjava/..... When I uncommented the mapping for the invoker should I remove the servlet part ?
In addition, I am trying to communicate with the servlet through a client java program - giving the entire class id - com.onjava.login - do I need to use the URL path instead ?
Any help is appreciated - I am going crazy with this. I use Tomcat 4.1+ and 1.4+
HELP!!

Path problems
2004-01-11 04:14:27 rahulbats [View]

The problem can be removed by adding the following
<servlet-mapping>
<servlet-name>login</servlet-name>
<url-pattern>/servlet/*</url-pattern>
</servlet-mapping>

this mapps the servlet/ url to the login servlet

Fantastic
2003-12-08 05:25:30 roccky [View]

Hi All, This Article is fantastic except for the glitch of servlet path. FYI I have configured tomcat to run under apache using JK2 connector. if anybody needs help please let me know. it was Good Exercise. Happy Learning!

Fantastic
2003-12-23 22:32:03 anonymous2 [View]

Can you post the difference with using JK2 - I checked the file and all the entries seem commented

action for servlet
2003-11-23 11:48:08 anonymous2 [View]

Maybe someone brought this up already (from the comments at the top), but for Tomcat 4.1.29, I did not need to add anything to the web.xml file, but I did need to specify the form action as

"/onjava/servlet/...."

rather than
"servlet/...."

I thought this was a great article, but if you don't do the bit above, Tomcat will look in the ROOT/WEB-INF/classes rather than onjava/WEB-INF/classes, and your servlet won't load.

-Chris

Output of login.jsp
2003-11-18 10:36:49 anonymous2 [View]

After I had entered an User and Password for example:

Username: Bob
Password: password

Type Status report

message /onjava/servlet/com.onjava.login

description The requested resource (/onjava/servlet/com.onjava.login) is not available.

The same for

type Status report

message /apress/servlet/chapter2.login

description The requested resource (/apress/servlet/chapter2.login) is not available.

in Apache Jakarta-Tomcat isbn: 1-893115-36-4

Output of login.jsp
2004-01-10 17:40:56 anonymous2 [View]

In the web.xml file in the conf directory you need to uncomment two parts the deal with the invoker (just search for it). The first is a <servlet> block and the second is a <servlet-mapping> block. I don't know why this isn't left uncommented to begin with. Restart tomcat and try again.

com.onjava.login.java CONFUSION!
2003-10-08 08:57:41 anonymous2 [View]

Hi guys,

I'm a little confused on Listing.4 of page 3.
Is the java file named as com.onjava.login.java?
Because the class name of the program is called login, therefore, I get some error msg saying the file should be name login.java.

So i tried renaming the file to login.java, but that just generated for error msgs.

So can someone clarify to me whether the file name is com.onjava.login.java or login.java?

Also, what's with the pack com.onjava?
Should i create the additional folders named com & onjava?

Thanx in advance

com.onjava.login.java CONFUSION!
2004-01-10 17:43:20 anonymous2 [View]

The file is just called login.java and it is contained in the folder 'classes/com/onjava/'

example needs updating?
2003-09-02 14:36:57 anonymous2 [View]

The onjava example looked well explained and clear, so following a clean install of Tomcat 4.1 on my PC, I followed it word-for-word. And it didn't work...

It seems I need to add <servlet-mapping> and its various constituents to my web.xml file to get the servlet to work. (The JSPs work already.)

Is the example designed for an older version of Tomcat? If so, please state with which versions it does work, as this would save confusion.

Ideally, please keep the example up-to-date, as it is among the best *simple* Tomcat servlet examples around. And it's infinitely better than the documentation that comes with Tomcat, which seems to be written only for those who know it all already.

Makes it soo easy.
2003-08-19 13:53:20 anonymous2 [View]

I wish I found that article last year when I
was doing this.
It did clear up the fear I was imparted about
creating tag libraries.

- doyourun

Very useful article
2003-08-07 19:47:19 mcook2 [View]

I found this article very useful, and learned extra from the discussion:

- how to fix the servlet mapping problem in ../conf/web.xml that was causing me 404 initially (also in another app. I am porting from an earlier release of Tomcat).

- how to compile: I use the following command:

javac -classpath ".;C:\jakarta-tomcat-4.1.27\common\lib\servlet.jar" *.java

I guess I should start using Ant, tho' it seems like a lot of work....

I still have another issue with the app. I am porting from Tomcat 3, and 4.0, where I am getting Error 500. I guess the answer lies somewhere between ..conf/server.xml, ..conf/web.xml, and the web.xml file for the app. itself.

Thanks!

Tag function doesn't work
2003-07-17 16:56:58 anonymous2 [View]

I got error "org.apache.jasper.JasperException: File "/onjava" not found" after I added tag functions to the example. The only difference is I created context "/onjava" for "D:\Apps\myApps\onjava".

Any suggestions?

problems for Tomcat ver 4.1.18 and above ...
2003-07-11 06:28:50 anonymous2 [View]

Took me a day to figure this out - if you've the latest version of Tomcat you need to uncomment the servlet-mapping element for the invoker servlet in the [CATALINA_HOME]\conf\web.xml file.

Look for "Built In Servlet Mappings" "The mapping for the invoker servlet". Uncomment the servlet-mapping element. Won't find your servlets otherwise.

problems for Tomcat ver 4.1.18 and above ...
2003-08-07 19:42:26 mcook2 [View]

Yes -- I encountered this with V4.1.27.

Thanks for the tip.

Excellent
2003-05-31 11:44:59 anonymous2 [View]

I was looking for a simple description on building and deploying web applications and here it is .Keep it up O'Reilly group.

Thanks
vhk

Excellent
2003-05-31 11:44:33 anonymous2 [View]

I was looking for a simple description on building and deploying web applications.Keep it up O'Reilly group.

Thanks
vhk

problem with accessing servlets in subfolders
2003-05-25 21:06:41 anonymous2 [View]

hi,
i am not able to access servlet classes within the sub folders..

ie /tomcat/webapps/examples/WEB-INF/classes/cal

i can access all the files present in classes but not in it's sub directories.

and i have one more problem, i have to give the following in URL in order to execute a servlet

http://localhost:8888/examples/servlet/CookieExample

and this does not work if i don't give servlet in the URL.

it would be of great help if someone could give me the details of how to access subfolder or about the context path settings.

thanking u in advance

problem with accessing servlets in subfolders
2003-11-23 11:51:13 anonymous2 [View]

Take a look at my comment...it seems I am not the only one with problems. You have to reference the servlet with

"/web-app-dir/servlet/servletname"

rather than "/servlet/servletname"

Otherwise Tomcat won't look in your /classes subfolder.

-Chris (coldfusion78_AT_yahoo.com)

how to set a path in servlets
2008-06-04 19:40:34 vineela1289 [View]

please tell me how to set a path .

problem with accessing servlets in subfolders
2003-05-26 02:33:42 anonymous2 [View]

Do you have your directory structure under classes declared as a package in your java class?

In your example, you should have the classes under cal being devlared as a package called cal.

I hope this helps. Good luck.

problem with accessing servlets in subfolders
2003-05-26 03:38:32 anonymous2 [View]

hi,

thank u for the reply.

yes, the package is declared in the java program. even then i am not able to run the built in examples of tomcat and in all the examples, packages has been declared.

is there anything to do with web.xml where u have to add <servlet-mapping>.

thanking u

santy (santosh_b_p@yahoo.com)

make it work with version 4.18 and above
2003-05-14 08:20:02 hkubba [View]

An important addition is to be added here: in the web.xml we must have 2 tags inside the < web-app> tag, those are <servlet> and <servlet-mapping> so when the article says :

<servlet>
<servlet-name>login</servlet-name>
<servlet-class>com.onjava.login</servlet-class>
</servlet>

another block should be added:

<servlet-mapping>
<servlet-name>login</servlet-name>
<url-pattern>/login</url-pattern> < !-- note it is /login not login -->
</servlet-mapping>

this will make it work

make it work with version 4.18 and above
2003-05-25 09:10:52 anonymous2 [View]

I have tried this suggestion and I still could not get it to work. I am running Tomcat 4.1.24 under Windows 2000 (Professional).

My web.xml file looks as follows:

<?xml version="1.0" encoding="ISO-8859-1"?>

<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN"
"http://java.sun.com/j2ee/dtds/web-app_2_2.dtd">

<web-app>

<servlet>
<servlet-name>login</servlet-name>
<servlet-class>com.onjava.login</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>login</servlet-name>
<url-pattern>/login</url-pattern>
</servlet-mapping>

</web-app>

My directory structure looks as follows:
<TOMCAT_HOME>\webapps\onjava
=====> images (directory)
=====> login.jsp
=====> welcome.jsp
=====> WEB-INF
==========> web.xml
==========> classes
===============> com
====================> onjava
==========================> login.class
==========================> login.java

I have set the ServletContext in Tomcat's server.xml. My XML statement looks as follows:
<Context path="/onjava" docBase="onjava"
debug="1" reloadable="true"/>

I was successfull in deploying an HTML and JSP application using Tomcat's administration tool and ant. I am always getting the HTTP 404 error when I am deploying servlets.

Any help is highly appreciated.

Thank you.

make it work with version 4.18 and above
2003-06-19 02:58:58 anonymous2 [View]

With Tomcat 4.1.24 (4.1.18 and above?)
if you want to use /servlet/* path,
you need to uncomment the invoker mapping
in <TOMCAT_HOME>\conf\web.xml
or include the invoker mapping:

<servlet-mapping>
<servlet-name>invoker</servlet-name>
<url-pattern>/servlet/*</url-pattern>
</servlet-mapping>

in your application's own web.xml.

Configuring Tomcat with IIS Web Server
2003-04-23 02:17:51 nanu [View]

Hello Sir, how r u.
Actually this mail is regarding the Configuring Tomcat with IIS web Server becuase i didn't find any mailing facility on this artical.
I would like to thanks James for his wonderfull demonstrative artical,but we r still facing problem with that configuration.
our specification is,we r developing a portal using setvlets/JSP's for IBM intranet & there is a need to configure the Tomcat with IIS to deploye the portal inorder to acheive the security concerns.
We followed the instuction as it is there in the artical,thinks r working fine.But whenever we start tomcat & shutdown, we r facing some Exception during individual action.I am attaching both the error file with their indicating respective action.

Environment we r using:
Win-2000(IIS 5.0)
Tomcat-4.1.18.zip(binay version)
Isapi_redirector.dll
Java sdk 1.4.1

but i didn't find any facility to attach the file.so i am adding the errors in the message itself.

ErrOnStart

Apr 23, 2003 12:10:56 PM org.apache.commons.modeler.Registry loadRegistry
INFO: Loading registry information
Apr 23, 2003 12:10:57 PM org.apache.commons.modeler.Registry getRegistry
INFO: Creating new Registry instance
Apr 23, 2003 12:10:58 PM org.apache.commons.modeler.Registry getServer
INFO: Creating MBeanServer
Apr 23, 2003 12:10:59 PM org.apache.coyote.http11.Http11Protocol init
INFO: Initializing Coyote HTTP/1.1 on port 8080
ServerLifecycleListener: createMBeans: MBeanException
java.lang.Exception: ManagedBean is not found with Ajp13Connector
at org.apache.catalina.mbeans.MBeanUtils.createMBean(MBeanUtils.java:224
)
at org.apache.catalina.mbeans.ServerLifecycleListener.createMBeans(Serve
rLifecycleListener.java:369)
at org.apache.catalina.mbeans.ServerLifecycleListener.createMBeans(Serve
rLifecycleListener.java:777)
at org.apache.catalina.mbeans.ServerLifecycleListener.createMBeans(Serve
rLifecycleListener.java:751)
at org.apache.catalina.mbeans.ServerLifecycleListener.createMBeans(Serve
rLifecycleListener.java:339)
at org.apache.catalina.mbeans.ServerLifecycleListener.lifecycleEvent(Ser
verLifecycleListener.java:206)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(Lifecycl
eSupport.java:166)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:218
2)
at org.apache.catalina.startup.Catalina.start(Catalina.java:512)
at org.apache.catalina.startup.Catalina.execute(Catalina.java:400)
at org.apache.catalina.startup.Catalina.process(Catalina.java:180)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:203)
Starting service Tomcat-Standalone
Apache Tomcat/4.1.18
Apr 23, 2003 12:11:08 PM org.apache.coyote.http11.Http11Protocol start
INFO: Starting Coyote HTTP/1.1 on port 8080
Apr 23, 2003 12:11:08 PM org.apache.jk.common.ChannelSocket init
INFO: Port busy 8009 java.net.BindException: Address already in use: JVM_Bind
Apr 23, 2003 12:11:08 PM org.apache.jk.common.ChannelSocket init
INFO: JK2: ajp13 listening on /0.0.0.0:8010
Apr 23, 2003 12:11:08 PM org.apache.jk.server.JkMain start
INFO: Jk running ID=1 time=40/61 config=c:\tomcat\conf\jk2.properties

ErrOnShutdown

ServerLifecycleListener: destroyMBeans: Throwable
javax.management.InstanceNotFoundException: MBeanServer cannot find MBean with O
bjectName Catalina:type=Valve,sequence=22514347,path=/admin,host=localhost,servi
ce=Tomcat-Standalone
at mx4j.server.MBeanServerImpl.findMBeanMetaData(MBeanServerImpl.java:28
2)
at mx4j.server.MBeanServerImpl.unregisterMBean(MBeanServerImpl.java:611)

at org.apache.catalina.mbeans.MBeanUtils.destroyMBean(MBeanUtils.java:21
84)
at org.apache.catalina.mbeans.ServerLifecycleListener.destroyMBeans(Serv
erLifecycleListener.java:853)
at org.apache.catalina.mbeans.ServerLifecycleListener.destroyMBeans(Serv
erLifecycleListener.java:1067)
at org.apache.catalina.mbeans.ServerLifecycleListener.destroyMBeans(Serv
erLifecycleListener.java:1016)
at org.apache.catalina.mbeans.ServerLifecycleListener.destroyMBeans(Serv
erLifecycleListener.java:1198)
at org.apache.catalina.mbeans.ServerLifecycleListener.destroyMBeans(Serv
erLifecycleListener.java:1170)
at org.apache.catalina.mbeans.ServerLifecycleListener.destroyMBeans(Serv
erLifecycleListener.java:796)
at org.apache.catalina.mbeans.ServerLifecycleListener.lifecycleEvent(Ser
verLifecycleListener.java:221)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(Lifecycl
eSupport.java:166)
at org.apache.catalina.core.StandardServer.stop(StandardServer.java:2218
)
at org.apache.catalina.startup.Catalina.start(Catalina.java:543)
at org.apache.catalina.startup.Catalina.execute(Catalina.java:400)
at org.apache.catalina.startup.Catalina.process(Catalina.java:180)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:203)
Stopping service Tomcat-Standalone

Configuring Tomcat with IIS Web Server
2003-04-23 02:16:24 nanu [View]

Hello Sir, how r u.
Actually this mail is regarding the Configuring Tomcat with IIS web Server becuase i didn't find any mailing facility on this artical.
I would like to thanks James for his wonderfull demonstrative artical,but we r still facing problem with that configuration.
our specification is,we r developing a portal using setvlets/JSP's for IBM intranet & there is a need to configure the Tomcat with IIS to deploye the portal inorder to acheive the security concerns.
We followed the instuction as it is there in the artical,thinks r working fine.But whenever we start tomcat & shutdown, we r facing some Exception during individual action.I am attaching both the error file with their indicating respective action.

Environment we r using:
Win-2000(IIS 5.0)
Tomcat-4.1.18.zip(binay version)
Isapi_redirector.dll
Java sdk 1.4.1

but i didn't find any facility to attach the file.so i am adding the errors in the message itself.

ErrOnStart

Apr 23, 2003 12:10:56 PM org.apache.commons.modeler.Registry loadRegistry
INFO: Loading registry information
Apr 23, 2003 12:10:57 PM org.apache.commons.modeler.Registry getRegistry
INFO: Creating new Registry instance
Apr 23, 2003 12:10:58 PM org.apache.commons.modeler.Registry getServer
INFO: Creating MBeanServer
Apr 23, 2003 12:10:59 PM org.apache.coyote.http11.Http11Protocol init
INFO: Initializing Coyote HTTP/1.1 on port 8080
ServerLifecycleListener: createMBeans: MBeanException
java.lang.Exception: ManagedBean is not found with Ajp13Connector
at org.apache.catalina.mbeans.MBeanUtils.createMBean(MBeanUtils.java:224
)
at org.apache.catalina.mbeans.ServerLifecycleListener.createMBeans(Serve
rLifecycleListener.java:369)
at org.apache.catalina.mbeans.ServerLifecycleListener.createMBeans(Serve
rLifecycleListener.java:777)
at org.apache.catalina.mbeans.ServerLifecycleListener.createMBeans(Serve
rLifecycleListener.java:751)
at org.apache.catalina.mbeans.ServerLifecycleListener.createMBeans(Serve
rLifecycleListener.java:339)
at org.apache.catalina.mbeans.ServerLifecycleListener.lifecycleEvent(Ser
verLifecycleListener.java:206)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(Lifecycl
eSupport.java:166)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:218
2)
at org.apache.catalina.startup.Catalina.start(Catalina.java:512)
at org.apache.catalina.startup.Catalina.execute(Catalina.java:400)
at org.apache.catalina.startup.Catalina.process(Catalina.java:180)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:203)
Starting service Tomcat-Standalone
Apache Tomcat/4.1.18
Apr 23, 2003 12:11:08 PM org.apache.coyote.http11.Http11Protocol start
INFO: Starting Coyote HTTP/1.1 on port 8080
Apr 23, 2003 12:11:08 PM org.apache.jk.common.ChannelSocket init
INFO: Port busy 8009 java.net.BindException: Address already in use: JVM_Bind
Apr 23, 2003 12:11:08 PM org.apache.jk.common.ChannelSocket init
INFO: JK2: ajp13 listening on /0.0.0.0:8010
Apr 23, 2003 12:11:08 PM org.apache.jk.server.JkMain start
INFO: Jk running ID=1 time=40/61 config=c:\tomcat\conf\jk2.properties

ErrOnShutdown

ServerLifecycleListener: destroyMBeans: Throwable
javax.management.InstanceNotFoundException: MBeanServer cannot find MBean with O
bjectName Catalina:type=Valve,sequence=22514347,path=/admin,host=localhost,servi
ce=Tomcat-Standalone
at mx4j.server.MBeanServerImpl.findMBeanMetaData(MBeanServerImpl.java:28
2)
at mx4j.server.MBeanServerImpl.unregisterMBean(MBeanServerImpl.java:611)

at org.apache.catalina.mbeans.MBeanUtils.destroyMBean(MBeanUtils.java:21
84)
at org.apache.catalina.mbeans.ServerLifecycleListener.destroyMBeans(Serv
erLifecycleListener.java:853)
at org.apache.catalina.mbeans.ServerLifecycleListener.destroyMBeans(Serv
erLifecycleListener.java:1067)
at org.apache.catalina.mbeans.ServerLifecycleListener.destroyMBeans(Serv
erLifecycleListener.java:1016)
at org.apache.catalina.mbeans.ServerLifecycleListener.destroyMBeans(Serv
erLifecycleListener.java:1198)
at org.apache.catalina.mbeans.ServerLifecycleListener.destroyMBeans(Serv
erLifecycleListener.java:1170)
at org.apache.catalina.mbeans.ServerLifecycleListener.destroyMBeans(Serv
erLifecycleListener.java:796)
at org.apache.catalina.mbeans.ServerLifecycleListener.lifecycleEvent(Ser
verLifecycleListener.java:221)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(Lifecycl
eSupport.java:166)
at org.apache.catalina.core.StandardServer.stop(StandardServer.java:2218
)
at org.apache.catalina.startup.Catalina.start(Catalina.java:543)
at org.apache.catalina.startup.Catalina.execute(Catalina.java:400)
at org.apache.catalina.startup.Catalina.process(Catalina.java:180)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:203)
Stopping service Tomcat-Standalone

Configuring Tomcat with IIS Web Server
2003-11-13 09:07:33 anonymous2 [View]

Any answers???

Configuring Tomcat with IIS Web Server
2003-11-13 09:06:36 anonymous2 [View]

I am having the same problem, additional question regarding this I am running IIS on port 80, On which port we are suppose to run Tomcat(80 or something else)?

Cant get this example to work on later version
2003-03-16 17:09:43 anonymous2 [View]

Duplicated this example to the letter on
tomcat 4.18 it cant find the login servlet
This works fine on 4.0 is there something else
I should be doing for the later versions
thanx in advance

doofusmaximus@hotmail.com
Commander of the legions of the dorks
(lesser known relative of Decimus Maximus
Commander of the Roman army and the legions of the North )

Cant get this example to work on later version
2003-05-14 08:18:59 hkubba [View]

An important addition is to be added here: in the web.xml we must have 2 tags inside the < web-app> tag, those are <servlet> and <servlet-mapping> so when the article says :

<servlet>
<servlet-name>login</servlet-name>
<servlet-class>com.onjava.login</servlet-class>
</servlet>

another block should be added:

<servlet-mapping>
<servlet-name>login</servlet-name>
<url-pattern>/login</url-pattern> < !-- note it is /login not login -->
</servlet-mapping>

this will make it work

Informative
2003-03-11 02:31:04 anonymous2 [View]

This article is informative. i would like to see more of Tomcat4/apache2 integration on production systems discussed

Thanks for the articles

rk

rk@exocore.com
Network consultant

I am not able access a EJB from a servlet running on a tomcat webroser
2003-02-24 06:36:13 modiba [View]

I have just started learning Java. I have created an entity bean and deployed on a j2ee refernce server. I have included Client.jar file in CLASSPATH variableThen I created a standalone application and it works fine. Now I am trying to use it in servlet deployed on a tom cat web server I get following error message-
javax.servlet.ServletException: Servlet execution threw an exception
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:260)
...
....
root cause

java.lang.NoClassDefFoundError: javax/ejb/EJBHome
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:493)

...

It seems that eventhough j2ee.jar is there in CLASSPATH variable TOM cat server is not using it and its uanble to find it. There must be some setting in some xml file which will allow me to do this. I am not sure about this Can you help me in this?

I am not able access a EJB from a servlet running on a tomcat webroser
2004-01-13 11:50:27 anonymous2 [View]

Hi
try to put your ejb.jar and j2ee.jar in the WEB-INF/lib/...
instead.
It seems that Tomcat doesnt consider at all the classpath .

Hope it helps
Rachid K.

Learn from my mistakes from this tutorial!
2003-02-11 08:12:20 anonymous2 [View]

Hi All,

I followed the tutorial and found some missing infos and I did some errors too. I use tomcat 4.1 and modified the code to link to a MS Access database on Windows XP.
1)
Missing in web.xml in this tutorial:
<servlet-mapping>
<servlet-name>login</servlet-name>
<url-pattern>/servlet/login</url-pattern>
</servlet-mapping>

and if you do this:
<servlet-mapping>
<servlet-name>login</servlet-name>
<url-pattern>/servlet/*</url-pattern>
</servlet-mapping>

All URL containing /servlet/ will be redirect to the login class!!!

2) Recheck your typo, I wrote WEB_INF instead on WEB-INF! Lost a half day why a having a 404 page!

3) ODBC, Data Source Name: use the SYSTEM dsn and not the USER dsn

Learn from my mistakes from this tutorial!
2005-06-18 12:29:03 tjmcgee [View]

2 Years later and I'm making the mistake that you made, Thank you sooooooooo much for writing: Recheck your typo, I lost half a day as well, drove me mad

a very useful article and a suggested improvement
2003-01-29 23:56:05 anonymous2 [View]

the article was really useful and helpd me get my tomcat server up and running, it would also be nice if a side menu of links would be available to help access all the articles in the series, presently i have no clue as to where the next article is and i am in dire need of it....
thanx anyway

a very useful article and a suggested improvement
2003-04-15 13:00:33 anonymous2 [View]

isn't there links at the bottom of the last page of this article?

a very useful article and a suggested improvement
2003-04-15 13:01:50 anonymous2 [View]

scratch that- go to onjava.com and put 'tomcat servlet' in the search box.

how to invoke jsp and servlet from html
2003-01-20 19:58:18 ladson4@comcast.net [View]

I installed tomcat ok. I can run the following:
1. jsp via http://localhost:8080/myJsp.jsp
2. servlet via http:localhost:8080/servlet/myServlet

But I cannot run html via
3. http://localhost:8080/myHtml.html
(question, where do I save the .html file?)

And I cannot launch a servlet or jsp from a html page, eg.
<HTML>
<BODY>
<h1><center>Welcome to RootTime.html</center></h1>

<form method="post" action="servlet/RootTime">

Please click to get the time from RootTime servlet

<input type="submit" value="Get Time">
</form>
</BODY>
</HTML>

data base connectivity using JConnect
2003-01-18 21:53:57 anonymous2 [View]

I am using JSP + sybase SQL Anywhere
i want to configure the driver (type 4) Jconnect in the tomcat server, which i am using .
how to do it? i am working on win98

thanx again
2002-12-09 09:38:38 anonymous2 [View]

Hi,
your article helped me as a beginner
in this tomcat stuff.

One little point:
perhaps it's not a good idea,
that the class(!) 'login' start with
lower case. (servlet-name is o.k., of course) ?!

anyway, thank you,

Heinrich Widman
heinrich.widmann@gmx.de

thanks
2002-12-06 05:00:00 anonymous2 [View]

the only useful example I've seen in 3 hours of searching - thanks!

neilok

What is the file name of Listing 4
2002-11-17 14:14:48 anonymous2 [View]

Hi,

I am a newbie to Servlets and JSP but I have a few questions forsomebody who has completed the tutorial can answer.
1. What is the file name of listing 4. Is is
login.java or com.onjava.login.java?

2. James' article says

To deploy a servlet as part of a web application you first need to compile the servlet and move it into the web application's /WEB-INF/classes directory. For this example, you should compile this servlet and move it to the /onjava/WEB-INF/classes/com/onjava/ directory.

This class file is in the subdirectory com.onjava because of its package name.

So........ we do create an subdirectory called

/onjava/WEB-INF/classes/com/onjava/

This is not a typo?

3. Is he statement below correct?

This class file is in the subdirectory com.onjava because of its package name.

should this say "/com/onjava" not com.onjava

could somedy explain this for me

Thanks in advance

stephanj@melbpc.org.au

What is the file name of Listing 4
2003-03-06 07:53:05 anonymous2 [View]

Anyone have any help on this

I created the subdirectory com\onjava and tried to compile com.onjava.login.java from there. I get a compile error:

com.onjava.login.java:8: class login is public, should be declared in a file named login.java
public class login extends HttpServlet {
^
1 error

Stuck so early on, too! Please help...and if anyone can give me a step-by-step of how to set classpath (Tomcat? Java?) to not create that problem with the HttpServlet thing, as many people have asked, I would be really grateful. I'm currently compiling all code like this:

~>javac -classpath ".;C:\Project\Apache Tomcat 4.0\common\lib\servlet.jar" nameoffile.java

Thanks to anyone who can spare a minute for a confused newbie.

Creating and Deploying a WAR File Step 4
2002-11-13 18:33:07 anonymous2 [View]

I have changed the context entry value to docBase="onjava.war" and restarted Tomcat.
Then, I tried to access this url thru browser (IE):
http://localhost:8080/login.jsp, but 404 error occurrs - "The requested resource (/login.jsp) is not available." ; is this the right way to access the page after deploying the war file to ../webapps directory?
Besides, does any know how to configure the localhost:8080 to my defined url like http://www.pqs.com/, appreciate if any one can give me the Tomcat configuration guide documents.

Virtual Directory?
2002-10-17 09:16:18 anonymous2 [View]

In production, the application is accessed with
http://host.com/apps/MyApp/login. The webserver forwards all urls with apps/ to the servlet container. The servlet container considers MyApp to be the application, and has no knowledge that it was forwarded with a url with /apps/

I would like to move this application to tomcat standalone on my machine to work on it. However, the application refers to urls that include the /apps and some that don't. It also uses postRedirect a couple times.

What I need is a way to configure tomcat so that it forwards all urls with apps or without to the same container and thus the same webapp.

Anyone know how to do this?

about context
2002-10-04 03:11:50 anonymous2 [View]

Hi,

I create a rep under c:\ called testapp. Could I change the server.xml file by adding a new context where the context path is "c:\testapp".
Thank-you for your attention.

Solution on 404 Tomcat Server side error !!
2002-10-02 02:56:38 anonymous2 [View]

Hi all, i don't know this is the only flaws that cause the 404 file not found error but it works for me.

Here is my 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/dtd/web-app_2_3.dtd">

<web-app>
<servlet>
<servlet-name>login</servlet-name>
<servlet-class>com.onjava.login</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>login</servlet-name>
<url-pattern>/servlet/*</url-pattern>
</servlet-mapping>

</web-app>
==========================================
* you should noticed the addtion element "servlet-mapping"

By the way i modify the form action from
"servlet/com.onjava.login" to "servlet/login" as well.

i thinks it is because of the different version of tomcat.

I try and error for days, so i think i should post here for anyone who follows my step.

ALex
Hong Kong

Another Solution
2002-10-22 22:37:34 zowens [View]

This is a great article, but I also had some trouble getting the example to work.

I followed the exact steps in the article and was getting a 404 error when submitting the login.jsp form. I changed my web.xml file to the following:

==========================================
<?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/j2ee/dtds/web-app_2_3.dtd">

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

This is assuming you have your .jsp pages in the root of the project directory �TOMCAT_ROOT/webapps/onjava/�. With this fix there is no need to change the action for the form.

Alex, thanks for heading me in the right direction!

Good Luck!
Zach

Solution works with servlets, but what about javabeans?
2003-01-12 10:44:24 qrobur [View]
I was very happy when these two messages put me on the road to running this example web application in Tomcat 4.1.18.

However, it is not a solution for my jsp pages that use javaBeans rather than servlets. This is the error I get:
```
description: The server encountered an internal error () that prevented it from fulfilling this request.



exception

org.apache.jasper.JasperException: Cannot find any information on property 'uName' in a bean of type 'coreBeans.FormBean'

etc.
```
If anybody can throw some light on this aspect of the problem I would be grateful.

Also, does anyone know why we are having to resort to mapping our servlets anyway?

problem with redirecting a directory
2002-09-25 23:28:39 anonymous2 [View]

I want to redirect a directory, without an application, I want to see the content of that directory.
I have added a link to that directory with "ln -s directory ../webapps/test/dir".
But now I am able to see the directory name, but if I click on that I get an message, that the content is unavailable.
The link: "http://webserver:8080/test" is working;
But "http://webserver:8080/test/dir" is not working and
"http://webserver:8080/test/dir/subdir" also fails.
Who knows a solution?

problem with redirecting a directory
2003-05-25 21:49:13 anonymous2 [View]

hello,

do we have to make some more changes in Server.xml and Web.xml ?? in order to access subfolder. r u able to access subfolders of examples directory ??

pls reply

santy (santosh_b_p@yahoo.com)

problem with redirecting a directory
2003-05-25 21:42:35 anonymous2 [View]

hello sir,

i do have the same problem, it would be of great help if u could inform me whenever u find the solution, or i'll inform u whenever i find the solution.

Great article
2002-09-17 01:18:32 anonymous2 [View]

I suffered with quite a few tutorials before I happened on this one via Google. Finally I understand the structure for approaching an installation on TomCat with servlets... Thanks a lot.

package javax.servlet doesn't exist problem
2002-09-03 11:36:45 bhoffman@hp.com [View]

Put servlet.jar in your CLASSPATH.

Deploying a Tomcat webapp to "server-root"...?!
2002-08-30 06:25:10 speak2mrh [View]

Hi James,

I've developed an application ("demoapp") which during development I accessed via the "/demoapp" context. I set up Apache to allow me to have apache serve static content and pass all JSP and servelet
request to tomcat.

I now need to deploy this application on the "server-root" of a production server so that when I access "http://www.prod-server.com/index.jsp" I am accessing the same file as when I access "http://www.dev-server.com/demoapp/index.jsp". From existing docs. and much trying I have been unable to do this so far.

Could you or anyone else advise on the apache 1.3 config. and the accompanying tomcat 4.04 config that I need to setup in order to get this to work the way I have described.

Many thanks in advance for any help.

Mark.

Deploying a Tomcat webapp to "server-root"...?!
2002-10-07 15:42:37 eepstein [View]

You can either out it in the (default) ROOT directory, or better, change the root context entry (has a path of "") to point to the directory of your app -- see the second page of this article, and the online docs re: context.

Creating and Deploying a WAR File Step 4
2002-08-20 15:03:09 taylormaai [View]

In step 4 of "Creating and Deploying a WAR File" section, I think it would of been nice to mention you have to change the context entry value to docBase="onjava.war".

Did you know that if you delete context entry, and delete the real webapps/onjava directory and leave the login.war file in webapps, the default action of tomcat is to extract that war file.
But one problem, the context entry is now missing and wont serve it. However, if you put in the context entry leaving the docBase="onjava" it will not extract the onjava.war. Do you know what i'm doing wrong if i desire for it to extract rather than serve from the war?

Other than that, it was a great primer article!

Thankyou

Creating and Deploying a WAR File Step 4
2003-10-15 12:14:27 anonymous2 [View]

Tomcat documentation (and this article as well) are misleading by not stating that a .war file will only be expanded by Tomcat if you DON'T have a <Context ....> defined with a "docBase" attribute that matches the name of the .war file minus ".war).

Creating and Deploying a WAR File Step 4
2002-08-26 10:44:05 slimd [View]

Take a look at this page from the Tomcat documentation:
http://jakarta.apache.org/tomcat/tomcat-4.0-doc/appdev/deployment.html

It references your question. Here is the paragraph that I believe provides insight to your comment.

Copy the web application archive file into directory $CATALINA_HOME/webapps/. When Tomcat is started, it will automatically expand the web application archive file into its unpacked form, and execute the application that way. This approach would typically be used to install an additional application, provided by a third party vendor or by your internal development staff, into an existing Tomcat installation. NOTE - If you use this approach, and wish to update your application later, you must both replace the web application archive file AND delete the expanded directory that Tomcat created, and then restart Tomcat, in order to reflect your changes.

Adding web application under separate filesystem ...
2002-08-16 12:26:58 dbarnick [View]

I've been trying to assist the java application developer by "deploying" his application under Tomcat. What we want to do is get the web-app to work from a totally separate (unix) filesystem, something like "/company/test/project", where this "/company/..." is *the* filesystem. I've searched the web and have been unable to find any examples of deploying an application in this manner - the examples all seem to point to placing it under the "/examples" structure under the tomcat server-root, or under the ROOT structure. The application DOES work if we place it under the /examples structure, but we don't want to deploy a production version, or even a test version under "examples". We want to keep production, test, and development totally separate if possible. Whenever I try the separate filesystem approach, I get the nebulous error message "The request resource (/company/test/project) is not available". I've tried several variations of "
Respectfully,

Don Barnick

Adding web application under separate filesystem ...
2002-08-26 10:56:58 slimd [View]

You can use the '/examples' context as an example.

<Context path="/yourAppsHTMLReference" docBase="dirYourAppIsIn" debug="0">

Copy your application into a new directory under webapps. Use the examples directory structure as a sample if you have classes to deploy (may put them under dirYourAppIsIn/WEB-INF/classes).

restart Tomcat and go to http://serverName/yourAppsHTMLReference/pageName to see your app.

Error with getServletContext
2002-07-24 07:39:05 laubert [View]

Hello, i am a french developper...

i have always this error when a i use this method getServletContext:

2002-07-24 04:39:15 - Ctx( ): Exception in: R( + /servlet/PoolTestServlet + null) - java.lang.NullPointerException
at javax.servlet.GenericServlet.getServletContext(GenericServlet.java:205)
at PoolTestServlet.doGet(PoolTestServlet.java:73)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:404)
at org.apache.tomcat.core.Handler.service(Handler.java:286)
at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
at org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:797)
at org.apache.tomcat.core.ContextManager.service(ContextManager.java:743)
at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:210)
at org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)
at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:498)
at java.lang.Thread.run(Thread.java:536)

HELP ME PLEASE?

LUDOVIC

Error with getServletContext
2003-04-14 06:46:22 anonymous2 [View]

Hello,

Have you found a solution?

Tks,
Nico (nidemesy@hotmail.com)

TagLibrary directions wrong?
2002-07-12 09:17:32 sharrison [View]

The article above reads, "To complete your deployment, copy the compiled tag library and the taglib.tld into the TOMCAT_ROOT/onjava/WEB-INF/lib directory."

But when I did this, the welcome.jsp would not compile at runtime because it couldn't find com.onjava.HelloTag.

I don't know what I did wrong, but placing the compiled tag library in /WEB-INF/classes/com/onjava/ worked.

having same problem where to access forum answer archives
2002-07-03 06:49:23 bd000435 [View]

Sorry I am a newbie but I am having the same problems these other had a while back

Where can I access the answers that others asked?

Maybe this way I can learn more without bothering anyone.

Thanks
BD

package javax.servlet doesn't exist problem
2002-02-06 07:35:47 wangdq007
package javax.servlet doesn't exist problem
2002-05-30 16:05:12 ed.smith@nau.edu

Problems connecting to my Database & fairly confused
2002-05-04 15:34:30 thehitman@mindspring.com [View]

I want to access the Sybase ASA database in two ways:
1) getServlet().findDataSource(null)
2) JNDI reference JDBC/BPPetstore

struts-config.xml

- <data-sources>


- <data-source>
<set-property property="autoCommit" value="true" />
<set-property property="description" value="Example Data Source Configuration" />
<set-property property="driverClass" value="com.sybase.jdbc2.jdbc.SybDriver" />
<set-property property="maxCount" value="4" />
<set-property property="minCount" value="2" />
<set-property property="password" value="sql" />
<set-property property="url" value="jdbc:sybase:Tds:BPPetstore:2638/BPPetstore" />
<set-property property="user" value="dba" />
</data-source>
</data-sources>

web.xml

<resource-ref>
<res-ref-name>What name should be here ?</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
<res-sharing-scope>Shareable</res-sharing-scope>
</resource-ref>

<!ELEMENT data-sources (data-source*)>
<!ATTLIST data-sources id ID #IMPLIED>


<!ELEMENT data-source (set-property*)>
<!ATTLIST data-source id ID #IMPLIED>
<!ATTLIST data-source key %BeanName; #IMPLIED>
<!ATTLIST data-source type %ClassName; #IMPLIED>


<!ATTLIST data-source autoCommit %Boolean; #IMPLIED>
<!ATTLIST data-source description CDATA #IMPLIED>
<!ATTLIST data-source driverClass %ClassName; #IMPLIED>
<!ATTLIST data-source loginTimeout %Integer; #IMPLIED>
<!ATTLIST data-source maxCount %Integer; #IMPLIED>
<!ATTLIST data-source minCount %Integer; #IMPLIED>
<!ATTLIST data-source password CDATA #IMPLIED>
<!ATTLIST data-source readOnly %Boolean; #IMPLIED>
<!ATTLIST data-source url CDATA #IMPLIED>
<!ATTLIST data-source user CDATA #IMPLIED>

<!ELEMENT resource-env-ref-type (#PCDATA)>



<!ELEMENT resource-ref (description?, res-ref-name, res-type, res-auth, res-sharing-scope?)>



<!ELEMENT res-ref-name (#PCDATA)>



<!ELEMENT res-type (#PCDATA)>



<!ELEMENT res-auth (#PCDATA)>



<!ELEMENT res-sharing-scope (#PCDATA)>

<!--

Using jConnect as a JNDI (Pooled) jdbc datasource under TomCat 4.0.3
By Bob Peck (Sybase Technical Support)

Note: You do NOT need to register a custom Object Factory. "com.sybase.jdbc2.jdbc.SybObjectFactory" must not appear anywhere in the configution.

1) In your $CATALINA/conf/server.xml file, define a resource similiar to the following (I defined my resource within a <Context> </Context>
bracket):

------------------------------------------------------------------------

<Resource name="jdbc/datasourcename" auth="Container"
type="javax.sql.ConnectionPoolDataSource"/>
<ResourceParams name="jdbc/datasourcename">

<parameter> <name>user</name> <value>your_userid</value> </parameter>
<parameter> <name>password</name><value>your_password</value></parameter>

<parameter>
<name>driverClassName</name><value>com.sybase.jdbc2.jdbc.SybDriver</value>
</parameter>

<parameter>
<name>driverName</name>
<value>jdbc:sybase:Tds:dataserverhostname:portnum/your_dbname</value>
</parameter>

<parameter><name>initialPoolSize</name><value>2</value></parameter>

</ResourceParams>

-------------------------------------------------------------------------------

2) In your webapp deployment descriptor,
(ie, in $CATALINA/webapps/webappname/WEB-INF/web.xml)
identify that server resource as follows:

<resource-ref>
<res-ref-name> jdbc/datasourcename </res-ref-name>
<res-type>javax.sql.DataSource </res-type>
<res-auth> Container </res-auth>
</resource-ref>

NOTICE:

In the server.xml: type="javax.sql.ConnectionPoolDataSource",
yet in the web.xml: <res-type> javax.sql.DataSource </res-type>

3) Copy jConnect classes jconn2.jar into your
%CATALINA%/common/lib subdirectory.

4) In your jsp,
code similiar to the following will work:

package javax.servlet doesn't exist problem
2002-02-06 07:35:47 [View]

Hi,

I'm pretty new to tomcat. I met a problem when I followed the article to add servlets. I copied the login.java code of Listing 4 and put it in /onjava/WEB-INF/classes/com/onjava. Then I compiled by javac com/onjava/login.java but the error messages say: package javax.servlet doesn't exist. What should I do? Your quick reply help is greatly appreciated.

Thanks,
Daqing

package javax.servlet doesn't exist problem
2002-05-30 16:05:12 ed.smith@nau.edu [View]

Daqing,

Saw your post regarding the Tomcat Apache tuturial by James Goodwill. Did you ever get "login.java" to compile? I'm having the same trouble.

TIA,

Ed

package javax.servlet doesn't exist problem
2003-09-22 01:07:09 anonymous2 [View]

compile it with the servlet.jar, which is in that common/lib folder of tomcat.

regards
Guru

package javax.servlet doesn't exist problem
2003-11-12 20:26:15 anonymous2 [View]

How??\
{thank you)

package javax.servlet doesn't exist problem
2002-07-03 07:04:27 bd000435 [View]

Daqing,
Saw your post regarding the Tomcat Apache tuturial by James Goodwill. Did you ever get "login.java" to compile? I'm having the same trouble.

TIA,

BD

package javax.servlet doesn't exist problem
2003-11-12 12:52:08 anonymous2 [View]

Hi,
Same problem here and with other packages compiling. Please let me know if your problem's solved,and I don't exactly know how we could compile the file with the servlet.jar and what the exact command for it is.

Sincerely and thanks

TOMCAT NOT OPENING HTML FILES
2002-01-27 11:49:05 farid1 [View]

My tomcat gives an error HTTP 404, The page could not be found when trying to open an html extention file. It opens normally any JSP file. Could anyone help me to slve this problem?

Tomcat 3.2 vs Tomcat 4.0 - Context path in server.xml
2002-01-22 07:11:41 gemmorahkop [View]

I followed the steps in this tutorial using Tomcat 4.0 - everything worked like a charm! With Tomcat 3.2 I experienced some glitches: the context path only worked when I changed ...
docBase="onjava" to ...
docBase="webapps/onjava"
When I tried using a WAR file, - with ... docBase="webapps/onjava.war" - Tomcat found the login.jsp file, but nothing else.

Does Tomcat 3.2 need to be configured differently - help required!?

P.S.: 5 stars for a very helpful article!?

could not run servlet in tomcat4.0.1 in own application?-urgent
2002-01-21 00:38:00 sharmakeshav [View]

Dear sir,
i m unable to run servlet which i placed in my application which is like that
in the specified folder i placed my servlet class file(s)
\webapps\MyApp\Web-inf\classes\HelloDemo.class
and i hv also specified the servlet mapping and registration in web.xml file which is in the folder
\webapps\MyApp\Web-inf\web.xml
and entry is like that
<servlet>
<servlet-name>HelloDemo</servlet-name>
<servlet-class>HelloDemo</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>HelloDemo</servlet-name>
<url-pattern>/servlet/*</url-pattern>
</servlet-mapping>

and i also have created the context of my application which is by the name of say MyApp
and entry is placed in conf/server.xml
as
<Context path="/MyApp" docBase="MyApp" debug="0" reloadable="true"></Context>
now my jsp files run properly but when i invoke servlet as
http://localhost/MyApp/servlet/HelloDemo
i get 404 message(not found) standard message
kindly help me out and send me mail in
keshav_sharma_2002@hotmail.com
or
keshav_sharma@escosoft-tech.com

waiting for u reply desparetely!
thx

could not run servlet in tomcat4.0.1 in own application?-urgent
2002-02-16 17:34:18 carmen1 [View]

I'm having the same problem and after a long time, I decided to switch to tomcat 1.3 and then lo and behold it all worked. Though I havent yet figured out the security stuff, yet.
Hope this will help you.
the man

Very, very useful article
2002-01-04 10:26:06 netmotion [View]

This is what I call a straght forward tutorial without any unimoprtant bla bla...

Thumbs up

Best I've read this week, and I've read a lot!
2001-12-14 19:45:09 kenjanuski2 [View]

I have a huge headache from a week's worth of trying to get JSPs and servlets working on Tomcat. Wouldn't you know that 3 hours after I finally got it working I ran across this article which explained most of the procedure? I wish I had found it earler, and I wish other resources had been half as useful.

My only suggestion, and it probably wouldn't really fit into the size constraints of the article, is just a few troubleshooting hints, e.g. for the ubiquitous "Requested resource is not available" error. Once you've convinced a reader to try out a new technology it would be good to leave them a few tips for the problems that they'll inevitably encounter.

But, like I said, this was by far the best resource I've come across in a week's worth of searching!

Servlet Caching in Tomcat 3.2.3
2001-12-03 04:48:58 jolmstead2k [View]

Much has been written about servlet caching in Tomcat, but I don't see a solution out there. I have tried the following code :

response.setHeader("Cache-Control", "no-cache");
response.setHeader("Pragma", "no-cache");
But I believe this code effects browser cache and not the cache of the servlet engine itself.

I have also have added reloadable="true" to the sevlet context of the server.xml file. Am I missing something, or am I just stuck with having to restart Tomcat every time I modify a servlet ?

Thank You;

John Olmstead
dbaDirect
John.Olmstead@dbaDirect.com
(859) 283 2520 ex 221

Servlet Caching in Tomcat 3.2.3
2003-10-29 16:13:37 anonymous2 [View]

This problem caused me so much time. What I found is Tomcat looks into "classes" before it looks into "lib" dir. The solution is to clean out the "classes" directory to force Tomcat to read from lib only.

C:\Apache_Group\jakarta-tomcat-4.1.27\webapps\axis\WEB-INF\classes

C:\Apache_Group\jakarta-tomcat-4.1.27\webapps\axis\WEB-INF\lib

Servlet Caching in Tomcat 3.2.3
2002-10-15 21:15:01 mta [View]

I have expirence a even more strange problem,
even restarting the Tomcat is not reloading the
jsp, we even did a reboot and the old jsp is still
running.

Wonderful article
2001-11-27 07:00:37 vvenk [View]

This article is extremely educational for a novice web developer and the step-by-step instructions are excellent.

It removed any phobia I had about learning this intimidating technology and after going through the article, it looks so simple!

Kudos

XML & Servlets
2001-09-29 07:54:45 cbodine [View]

James:

I would like to be able to accept info from a Web page form, process the data and store it into a persistent XML file for translation by XSL at a later point. I have written code to do this, but when trying to run my code, I get a "sealing violation". I have downloaded and read most of the articles on this violation; do you have any hints or sample code that you could part with that would guide me through this problem?

Sincerely,

Clayton Bodine

XML & Servlets
2001-11-27 07:03:07 vvenk [View]

Clayton:

Were you able to figure out a solution to the problem. I am dealing with a similar task and would like to know what the resolution was.

Thanks.

Looks like HelloTag class is not called
2001-09-17 05:18:06 xxlfalcon [View]

The article was great. But i have a problem. Everything worked but when i used the taglibs it failed. I still have the following line in my HTML file which is parsed to the browser.

<onjava:hello /> : Bob

It looks like the HelloTag class isn't called. Any suggestion. I have placed the file HelloTag.class file in the directory

TOMCAT_HOME\webapps\onjava\WEB-INF\classes\com\onjava

Anyones know the solution.

Thanks
XXLFalcon

Looks like HelloTag class is not called
2001-09-17 07:01:49 xxlfalcon [View]

Ggggrrrrrr...

I forgot to include the line

<%@ taglib uri="/onjava" prefix="onjava" %>

when doing a Copy-Paste

Everything is working correctly now.

Problem deploying tag library
2001-09-06 16:06:53 makarand_kulkarni [View]

I am using Tomcat 3.2.2 to follow the deploy example in the article.

I found a small discrepancy regarding the directory where the compiled
tag library should be placed. The compiled tag library should be placed
under TOMCAT_ROOT/onjava/WEB-INF/classes/ directory and NOT
under TOMCAT_ROOT/onjava/WEB-INF/lib directory as the article mentions. Only
the file taglib.tld should be under the ../lib directory.

Great Stuff
2001-09-03 15:20:46 xirak [View]

Very clear and easy to follow.

Port 8080 vs Non specified
2001-09-01 09:40:14 timodell [View]

This example works if I specify Port 8080 like so:

Open URL: http://localhost:8080/onjava/login.jsp
enter ID and Password and submit
observe: http://localhost:8080/onjava/servlet/com.onjava.login

However it I do like this with no port specified:

http://localhost/onjava/login.jsp
enter ID and Password and submit
observe: http://localhost/onjava/servlet/com.onjava.login

I get at 405 error.

The error in the jasper.log is:
2001-09-01 08:59:42 - JspEngine --> /login.jsp
2001-09-01 08:59:42 - ServletPath: /login.jsp
2001-09-01 08:59:42 - PathInfo: null
2001-09-01 08:59:42 - RealPath: C:\jakarta-tomcat-3.2.3\webapps\onjava\login.jsp
2001-09-01 08:59:42 - RequestURI: /onjava/login.jsp
2001-09-01 08:59:42 - QueryString: null
2001-09-01 08:59:42 - Request Params:
2001-09-01 08:59:42 - Classpath according to the Servlet Engine is: C:\jakarta-tomcat-3.2.3\webapps\onjava\WEB-INF\classes

Why is this?

How to connect Tomcat v4 and Apache?
2001-08-09 09:47:23 mcrunner [View]

I'm trying to make apache answer html requests and tomcat answer jsp and servlet requests. But how to do that with Apache v1.3 and Tomcat v4.0 Beta

Thanks in advance,
McRunner

Thank's for this article
2001-07-17 23:54:00 jkinder [View]

After a lot of searches online and libraries, I found your article. It's a very good, clear and easy to read article.
Actually i'm on the study of a web application deploying, based on java servlets. After that i'm able to do it.

Encore merci !...

JM Kinder

Very good article -- detailed instructions helped me get web application running. Thanks.
2001-07-08 09:46:41 gwiens [View]

I found your instructions precise, clear, and easy to follow, and was able to get my web application installed in short order.

I do have an additional question: I am running Tomcat as a stand-alone server. I would like to disable all of the other applications which come with Tomcat (i.e., the "example" pages and the other help pages). Can you help me find the documentation which would guide me through this?

Thanks again.

Glenn Wiens
glenn_wiens@yahoo.com

Thanks!
2001-07-02 01:35:46 ijbarton [View]

That was an excellent article. Clear and concise.

servlet contexts and URLs in JSPs
2001-06-27 11:31:38 qkak [View]

One thing seems to be missing from the servlet/JSP spec or implementation is how to handle URLs to releated resources in the WAR file.

If I have a URL that is from WAR root it does not get found. Something like this:

<IMG HREF=/images/test.jpg>

If I put this in a context other than root, it will not find the image. Is there a method to rewrite these URLs to include the context prefix?

Can Tomcat automatically recompile JSPs?
2001-06-26 06:53:23 ajag [View]

Working through this excellent tutorial, I found that I had to go and find the compiled versions of my JSPs and delete them before any changes to the JSPs were reflected in the browser. Is there a way to get Tomcat to automatically reprocess a JSP when it has been changed?

Thanks - A.

Can Tomcat automatically recompile JSPs?
2003-09-23 05:31:44 anonymous2 [View]

yes

Can Tomcat automatically recompile JSPs?
2001-08-03 11:12:02 teamturner [View]

Did you ever get an answer to your question? I am having the same problem.

Can Tomcat automatically recompile JSPs?
2001-08-16 04:33:31 pjoanes [View]

For reliable recompilation of JSPs I've found tomcat 4 to be better than 3.2.x.
However your problem sounds more like maybe a timestamp/caching problem.
To stop browsers caching a page I put the following at the top:

<% response.setHeader("Cache-Control","no-cache"); //HTTP 1.1
response.setHeader("Pragma","no-cache"); //HTTP 1.0
response.setDateHeader ("Expires", -1); //prevents caching at the proxy
server
%>
Hope this helps,

Peter Joanespjoanes@hotmail.com

Updating an existing web application
2001-06-05 12:42:37 eacusson [View]

Is there a way to update an existing web application using this same technique, without having to delete the old web application folder?

Problem with Tag Library
2001-05-07 08:53:25 juan_alvarado [View]

I get the following message when welcome.jsp is suppose to show up on my screen:

org.apache.jasper.compiler.CompileException: C:\tomcat\webapps\onjava\welcome.jsp(0,0) Unable to open taglibrary /onjava : Parse Error in the tag library descriptor: External entity not found: "http://java.sun.com/j2ee/dtds/web-app_2_3.dtd".
at org.apache.jasper.compiler.JspParseEventListener.handleDirective(JspParseEventListener.java:713)
at org.apache.jasper.compiler.DelegatingListener.handleDirective(DelegatingListener.java:116)
at org.apache.jasper.compiler.Parser$Directive.accept(Parser.java:215)
at org.apache.jasper.compiler.Parser.parse(Parser.java:1077)
at org.apache.jasper.compiler.Parser.parse(Parser.java:1042)
at org.apache.jasper.compiler.Parser.parse(Parser.java:1038)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:182)
at org.apache.jasper.servlet.JspServlet.doLoadJSP(JspServlet.java:462)
at org.apache.jasper.servlet.JasperLoader12.loadJSP(JasperLoader12.java:146)
at org.apache.jasper.servlet.JspServlet.loadJSP(JspServlet.java:433)
at org.apache.jasper.servlet.JspServlet$JspServletWrapper.loadIfNecessary(JspServlet.java:152)
at org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:164)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:318)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:391)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:404)
at org.apache.tomcat.core.Handler.service(Handler.java:286)
at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
at org.apache.tomcat.facade.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:194)
at com.onjava.login.doPost(login.java:52)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:404)
at org.apache.tomcat.core.Handler.service(Handler.java:286)
at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
at org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:797)
at org.apache.tomcat.core.ContextManager.service(ContextManager.java:743)
at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:210)
at org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)
at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:498)
at java.lang.Thread.run(Thread.java:484)

Your help would be appreciatted.

Thanks,

Juan Alvarado
juan2000@aol.com

Problem with Tag Library
2001-09-17 04:57:04 xxlfalcon [View]

Try opening the web.xml file within XML-SPY. XML-SPY will complain about the link to the dtd file

http://java.sun.com/j2ee/dtds/web-app_2_3.dtd.

It looks like this file is replaced by the following link.

http://java.sun.com/dtd/web-app_2_3.dtd

Replacing the string solved my problem.

Problem with Tag Library
2001-08-29 21:34:24 vivianchiu [View]

I also have the same problem as Juan's,
can anyone help?

Velocity beats JSP
2001-04-22 00:30:40 latchkey [View]

Another Jakarta Project:

http://jakarta.apache.org/velocity/

Velocity is a Java-based template engine. It permits web page designers to use simple yet powerful template language to reference objects defined in Java code. Web designers can work in parallel with Java programmers to develop web sites according to the Model-View-Controller (MVC) model, meaning that web page designers can focus solely on creating a site that looks good, and programmers can focus solely on writing top-notch code. Velocity separates Java code from the web pages, making the web site more maintainable over the long run and providing a viable alternative to Java Server Pages (JSPs) or PHP.

Creating and Deploying a WAR File

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