Re: servlet benchmarking vs cgi
Aryeh Katz wrote: Did you try getting the max throughtput using another servlet ? If there's a performance problem with your servlet, you could use something like OptimizeIt to figure it improve it. I downloaded OptimizeIt, ran it on my servlet and ran ab. As expected most of the CPU time was in the AJP stuff, and most of the AJP stuff was in my servlet. However, the majority of the processing being done was PrintWriter.flush. Contrary to some of the other posts here, I didn't see anything in StringBuffer.replace. I'm basing this on the CPU profiler. If there is something else I should look at, please let me know I can't see why PrintWriter.flush() (probably called in CoyoteWriter.flush()) takes so much CPU time. If it is confirmed to be a problem, then we can reimplement the functions instead of relying on the superclass. What you may want to experiment with: - use JDK 1.4.1 (faster) - try Tomcat standalone (JK has more overhead than standalone Tomcat) Otherwise, can you send more details of the profile ? I didn't see a spike in that function while profiling JSPs or the HelloWorld servlet, which both use the CoyoteWriter. Thanks, Rémy -- To unsubscribe, e-mail: mailto:tomcat-user-unsubscribe;jakarta.apache.org For additional commands, e-mail: mailto:tomcat-user-help;jakarta.apache.org
RE: Rare request delay of 100 seconds
What kernel version are you running? -Original Message- From: Randy Watler [mailto:rwatler;finali.com] Sent: 08 November, 2002 5:08 PM To: Tomcat Users List Subject: Re: Rare request delay of 100 seconds George, This is a non-SSL secure connector that is fronted by an SSL hardware. This means that Tomcat is seeing the traffic as plain HTTP. The packet data we traced was to the Tomcat server itself, so the SSL hardware seems to have been eliminated from the equation. The connector is set to https and secure so that Tomcat servlets know they are served in a secure context. Randy Watler Finali Corporation Sexton, George wrote: If you don't use SSL do you have the same problem? -Original Message- From: Randy Watler [mailto:rwatler;finali.com] Sent: 08 November, 2002 4:41 PM To: Tomcat Users List Subject: Re: Rare request delay of 100 seconds George, Thanks for the query. Here is the connector configuration: Connector className=org.apache.coyote.tomcat4.CoyoteConnector port=8543 minProcessors=8 maxProcessors=128 enableLookups=false acceptCount=64 debug=0 connectionTimeout=30 scheme=https secure=true useURIValidationHack=false/ So, I think we have it setup right, no? Randy Watler Finali Corporation Sexton, George wrote: Do you have the connector doing reverse DNS resolution of hosts? -Original Message- From: Randy Watler [mailto:rwatler;finali.com] Sent: 08 November, 2002 4:22 PM To: [EMAIL PROTECTED] Subject: Rare request delay of 100 seconds We are using 4.1.12 standalone on RedHat Linux 7.3 servers and having rare HTTP requests delayed on their way into the Coyote HTTP/1.1 connectors. We have packet traces that indicate the request is delayed by exactly 100 seconds, but otherwise is received and responded to as one would expect. Other requests immediately before and after the problematic ones are handled without any significant delay. We are wondering if others have noticed this problem or similar ones that sound like it? In the coyote connector code, it appears that the request sockets are set by default to have 100 second SO_LINGER timeouts for socket close() calls. Of course, this looks suspicious given our problem, but we have not been able to identify any way the blocked close() operation could affect incoming accept() requests. It is clear that running out of processor threads in the thread pool could cause such a delay, but we are not running under loads where this would happen, especially for 100 seconds. Any ideas out there? Randy Watler Finali Corporation -- To unsubscribe, e-mail: mailto:tomcat-user-unsubscribe;jakarta.apache.org For additional commands, e-mail: mailto:tomcat-user-help;jakarta.apache.org -- To unsubscribe, e-mail: mailto:tomcat-user-unsubscribe;jakarta.apache.org For additional commands, e-mail: mailto:tomcat-user-help;jakarta.apache.org -- To unsubscribe, e-mail: mailto:tomcat-user-unsubscribe;jakarta.apache.org For additional commands, e-mail: mailto:tomcat-user-help;jakarta.apache.org
Creating a new web app under webapps folder
Hi, I downloaded Tomcat 4.1.12 recently. I wanted to create a folder called mpapp under webapps folder. Like in Tomcat 3, I created a folder, then stoped and started tomcat. But, this did not work, I get the following error. HTTP Status 404 - /myapp type Status report message /myapp description The requested resource (/myapp) is not available. How can I resolve this? Can you give an example on how to create a app using the manager. thanks you, Ashfaque Nalim. _ STOP MORE SPAM with the new MSN 8 and get 2 months FREE* http://join.msn.com/?page=features/junkmail -- To unsubscribe, e-mail: mailto:tomcat-user-unsubscribe;jakarta.apache.org For additional commands, e-mail: mailto:tomcat-user-help;jakarta.apache.org
How do I use the admin webapp in 4.1.12 ?
Hello, I downloaded 4.1.12 today and decided to explore it. How do I use the admin webapp ? I was able to use the manager app after creating a user in tomcat-users.xml. Thanks, Sriram __ Do you Yahoo!? U2 on LAUNCH - Exclusive greatest hits videos http://launch.yahoo.com/u2 -- To unsubscribe, e-mail: mailto:tomcat-user-unsubscribe;jakarta.apache.org For additional commands, e-mail: mailto:tomcat-user-help;jakarta.apache.org
Re: how to STOP TOMCAT LOGGING
randie ursal wrote: hi list, how can i disable logging on TOMCAT? i have a tomcat on a Solaris 8.0 machine, and when i look at the logs folder the log files from previous months was not erased. so, if this is going on for so long there's a tendency that my disk space will be full. BTW, im using jakarta-tomcat-4.0. thanks. -- To unsubscribe, e-mail: mailto:tomcat-user-unsubscribe;jakarta.apache.org For additional commands, e-mail: mailto:tomcat-user-help;jakarta.apache.org i suggest you the followings: - buy a 80 GB hard disk - delete files each time you backup your HD - Unsubscribe to all EZLN or else your disk will be filled faster -- \/ /\ -- To unsubscribe, e-mail: mailto:tomcat-user-unsubscribe;jakarta.apache.org For additional commands, e-mail: mailto:tomcat-user-help;jakarta.apache.org
how to STOP TOMCAT LOGGING
hi list, how can i disable logging on TOMCAT? i have a tomcat on a Solaris 8.0 machine, and when i look at the logs folder the log files from previous months was not erased. so, if this is going on for so long there's a tendency that my disk space will be full. BTW, im using jakarta-tomcat-4.0. thanks. -- To unsubscribe, e-mail: mailto:tomcat-user-unsubscribe;jakarta.apache.org For additional commands, e-mail: mailto:tomcat-user-help;jakarta.apache.org
Got admin working.. (Re: How do I use the admin webapp in 4.1.12 ?)
Since I was able to add myself as manager using tomcat-users, I added admin priveleges the same way. Here's the line in my tomcat-users.xml file: user username=sriram password=foo roles=manager,admin/ However, this is not documented anywhere in the tomcat docs. --Sriram --- Sriram N [EMAIL PROTECTED] wrote: Hello, I downloaded 4.1.12 today and decided to explore it. How do I use the admin webapp ? I was able to use the manager app after creating a user in tomcat-users.xml. Thanks, Sriram __ Do you Yahoo!? U2 on LAUNCH - Exclusive greatest hits videos http://launch.yahoo.com/u2 -- To unsubscribe, e-mail: mailto:tomcat-user-unsubscribe;jakarta.apache.org For additional commands, e-mail: mailto:tomcat-user-help;jakarta.apache.org
Re: how to STOP TOMCAT LOGGING
You can try disabling debugging in your server.xml
for example:
Server port=8005 shutdown=SHUTDOWN debug=1
to
Server port=8005 shutdown=SHUTDOWN debug=0
there are several others. The other thing to check is to check the log
level for the log. You'll have to check the tomcat manual for that... it
escapes me at the moment. But for example you can change the log level
for mod_jk if you're using it
in apache:
JkLogLevel debug to
JkLogLevel emerg
The best thing though is to rotate the logs, assuming you have a tomcat
startup/shutdown script. This is from memory so it might not be
syntactically correct but you get the idea
#!/bin/sh
# tomcat startup/shutdown script
# jm-tomcat.sh
TOMCAT_HOME=/usr/local/tomcat
JAVA_HOME=/usr/java
CATALINA_HOME=${TOMCAT_HOME}
SCRIPT_NAME=`basename $0`
Usage()
{
echo ${SCRIPT_NAME} start|stop|restart
exit 1
}
if [ $# != 1 ];
then
Usage
fi
case $1 in
start)
if [ -f ${CATALINA_HOME}/bin/startup.sh ];
then
${CATALINA_HOME}/bin/startup.sh
if [ $? != 0 ];
then
echo Tomcat failed to start!
exit 1
else
echo Tomcat started successfully!
exit 0
fi
echo $$ /tmp/tomcat.pid # this may or may not work
fi
;;
stop)
if [ -f ${CATALINA_HOME}/bin/shutdown.sh ];
then
${CATALINA_HOME}/bin/shutdown.sh
if [ $? != 0 ];
then
echo Tomcat failed to stop! Is Tomcat running? /bin/ps -ef |
grep java
exit 1
else
echo Tomcat terminated successfully!
exit 0
fi
;;
restart)
echo Restarting tomcat
$0 stop
sleep 5
$0 start
;;
esac
#!/bin/sh
# rotate logs
# jm-rotate.sh
SRCPATH=/usr/local/tomcat/logs
DSTPATH=/archive # place to store them
SCRIPT_NAME=`basename $0`
LOG_TO_ROTATE=mod_jk.log # name of log to rotate
make_backup()
{
# Save the number of days here
# I'm pretty proud of myself for figuring out this one ^_^
# this part of the code should work since I'm using this somewhere
# else
FILE=$1
# save 5 days with 4 being the oldest and 0 the newest
for i in 4 3 2 1 0
do
# uncomment this for debugging
#echo ${FILE}.${i}
if [ -r ${FILE}.${i} ];
then
k=`expr $i + 1`
echo /bin/mv -f ${FILE}.${i} to ${FILE}.${k}
/bin/mv -f ${FILE}.${i} ${FILE}.${k}
fi
done
return
}
# Stop tomcat
/tmp/jm-tomcat.sh stop
if [ $? = 0 ];
then
# rotate logs in archive directory
make_backup ${DSTDIR}/${LOG_TO_ROTATE}
# get the most current one for today
if [ -r ${SRCDIR}/${LOG_TO_ROTATE} ];
then
/bin/mv ${SRCDIR}/${LOG_TO_ROTATE} ${DSTDIR}/${LOG_TO_ROTATE}.0
fi
echo Backup is complete! Thanks for using JM Script. Have a nice day!
# backup is done--restart tomcat
/tmp/jm-tomcat.sh start
fi
Hope that helps..
Jan-Michael Ong
- Original Message -
From: yves lambert [EMAIL PROTECTED]
Date: Saturday, November 9, 2002 7:38 am
Subject: Re: how to STOP TOMCAT LOGGING
randie ursal wrote:
hi list,
how can i disable logging on TOMCAT?
i have a tomcat on a Solaris 8.0 machine, and when i look at the
logs folder the log files from previous months was not erased. so,
if this is going on for so long there's a tendency that my disk
space will be full.
BTW, im using jakarta-tomcat-4.0.
thanks.
--
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mailto:tomcat-user-help;jakarta.apache.org
i suggest you the followings:
- buy a 80 GB hard disk
- delete files each time you backup your HD
- Unsubscribe to all EZLN or else your disk will be filled faster
--
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/\
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Contribution to the running.txt file for thje admin and manager web apps.
Hello, Since the running.txt does not contain any kickstart information for the manager and admin web applications, here's something that we could use as a placeholder until something better is developed. I was thinking of placing this paragraph before the (5) Troubleshooting section in the file running.txt * The Manager and the Admin web applications. --- These web applications can be used to maintain the Tomcat. They are priveleged web applications. If you are using the Memory Realm (which is the default), then the access can be configured from the $CATALINA_HOME$/conf/tomcat-users.xml. This file contains a few predefined roles and users for such roles. To access the manager application with the username mgr and the password pwd , add the following line to tomcat-users.xml user username=mgr password=pwd roles=manager/ The manager web application is documented in the Manger-Howto, a part of the Tomcat documentation. To access the admin application with the username adm and the password pwd, add the following line to tomcat-users.xml user username=adm password=pwd roles=admin/ The admin web application does not have a dedicated documentation page. Contributions are welcome. * Sriram __ Do you Yahoo!? U2 on LAUNCH - Exclusive greatest hits videos http://launch.yahoo.com/u2 -- To unsubscribe, e-mail: mailto:tomcat-user-unsubscribe;jakarta.apache.org For additional commands, e-mail: mailto:tomcat-user-help;jakarta.apache.org
Contribution to the running.txt file for thje admin and manager web apps.
Hello, Since the running.txt does not contain any kickstart information for the manager and admin web applications, here's something that we could use as a placeholder until something better is developed. I was thinking of placing this paragraph before the (5) Troubleshooting section in the file running.txt * The Manager and the Admin web applications. --- These web applications can be used to maintain the Tomcat. They are priveleged web applications. If you are using the Memory Realm (which is the default), then the access can be configured from the $CATALINA_HOME$/conf/tomcat-users.xml. This file contains a few predefined roles and users for such roles. To access the manager application with the username mgr and the password pwd , add the following line to tomcat-users.xml user username=mgr password=pwd roles=manager/ The manager web application is documented in the Manger-Howto, a part of the Tomcat documentation. To access the admin application with the username adm and the password pwd, add the following line to tomcat-users.xml user username=adm password=pwd roles=admin/ The admin web application does not have a dedicated documentation page. Contributions are welcome. * Sriram __ Do you Yahoo!? U2 on LAUNCH - Exclusive greatest hits videos http://launch.yahoo.com/u2 -- To unsubscribe, e-mail: mailto:tomcat-user-unsubscribe;jakarta.apache.org For additional commands, e-mail: mailto:tomcat-user-help;jakarta.apache.org
Re: Got admin working.. (Re: How do I use the admin webapp in 4.1.12?)
Sriram N wrote: Since I was able to add myself as manager using tomcat-users, I added admin priveleges the same way. Here's the line in my tomcat-users.xml file: However, this is not documented anywhere in the tomcat docs. This is written in the default home page (you need admin role for the admin webapp). Rémy -- To unsubscribe, e-mail: mailto:tomcat-user-unsubscribe;jakarta.apache.org For additional commands, e-mail: mailto:tomcat-user-help;jakarta.apache.org
Re: Got admin working.. (Re: How do I use the admin webapp in 4.1.12 ?)
--- Remy Maucherat [EMAIL PROTECTED] wrote: Sriram N wrote: Since I was able to add myself as manager using tomcat-users, I added admin priveleges the same way. Here's the line in my tomcat-users.xml file: However, this is not documented anywhere in the tomcat docs. This is written in the default home page (you need admin role for the admin webapp). Rémy Ack Remy, so it is. Perhaps we should change the sample role names and the user name to something more self-explanatory ? For a person who's just installed Tomcat for the first time in his life, we should perhaps have more descriptive role names. Currently role1 and tomcat do not reveal much to a person who doesn't even know what roles are all about. Sriram __ Do you Yahoo!? U2 on LAUNCH - Exclusive greatest hits videos http://launch.yahoo.com/u2 -- To unsubscribe, e-mail: mailto:tomcat-user-unsubscribe;jakarta.apache.org For additional commands, e-mail: mailto:tomcat-user-help;jakarta.apache.org
RE: sending SMS messages
Which class was that? Do you have an URL? Best regards, Lars Nielsen Lind -- Original Message -- Reply-To: Tomcat Users List [EMAIL PROTECTED] From: neal [EMAIL PROTECTED] To: Tomcat Users List [EMAIL PROTECTED] Subject: sending SMS messages Date: Fri, 8 Nov 2002 00:03:23 -0800 Does anyone know how to send an SMS message from a java website? I want my site to send a txt msg to my cell phone whenever a major error occurs. The only cods I've found thus far discuss sending an SMS using a class in the J2ME. Is there a class in std JDK or J2EE that can do this? Or, is it possible to install J2ME on a webserver, as a compliment to JDK? Thanks. Neal -- To unsubscribe, e-mail: mailto:tomcat-user-unsubscribe;jakarta.apache.org For additional commands, e-mail: mailto:tomcat-user-help;jakarta.apache.org -- To unsubscribe, e-mail: mailto:tomcat-user-unsubscribe;jakarta.apache.org For additional commands, e-mail: mailto:tomcat-user-help;jakarta.apache.org
Re: Rare request delay of 100 seconds
George, Oops! I was off by one on the RedHat version. Here is the whole story: RedHat 7.2 Linux version: 2.4.9-31smp gcc version: 2.96 Sorry I forgot to include this information up front! Randy Watler Finali Corporation Sexton, George wrote: What kernel version are you running? -- To unsubscribe, e-mail: mailto:tomcat-user-unsubscribe;jakarta.apache.org For additional commands, e-mail: mailto:tomcat-user-help;jakarta.apache.org
Does Tomcat provide a API for user login?
Hi, is it possible to call a method within a JSP or servlet and pass a user name and password in order to validate those credentials and log in the user? It would be great if I there were an API supporting that as I have a login scenario that does not seem to be supported by Tomcat (login form without prior access to a restricted resource). Thanks for any hints, Hans -- To unsubscribe, e-mail: mailto:tomcat-user-unsubscribe;jakarta.apache.org For additional commands, e-mail: mailto:tomcat-user-help;jakarta.apache.org
retrieving remote web content
Hi, I'm trying to develop a servlet that can act as a proxy for another web site-- lets' say I'm trying to provide the content of www.google.com. It seems I can retrieve and cache the HTML using a URLConnection, but what about the resources used by the HTML like gif's and jpg's. Somehow I need to parse the HTML and get those separately? Is there a library out there for doing what I describe? Maybe I'm missing something relaly simple... Thanks, Jason -- To unsubscribe, e-mail: mailto:tomcat-user-unsubscribe;jakarta.apache.org For additional commands, e-mail: mailto:tomcat-user-help;jakarta.apache.org
RE: retrieving remote web content
Hi, I haven't made a servlet to do this, but I made a jsp-tag that can do this. If you don't want to move the images from one server to another (from google to yours) as a proxy would do it, then you must parse the HTML, and change all the urls for css, img, hrefs, javascripts and a lot more so that they are fully qualified urls such as http://google.com/images/logo.gif but not only /images/logo.gif or such. This is usually not very complicated, but it can be a little tricky, especially with javascripts and such. I used regular expression to do this, more specifically the jakarta-oro package.. I still recommend some serverside cacheing of parsed pages, as this can be quite process demanding procedure. If you find some library to do this, please tell us about it. There are some libraries that might help doing the http-requests, so check that one out, its HTTPClient: http://www.innovation.ch/java/HTTPClient/ Hope it helps, -reynir -Original Message- From: Jason Novotny [mailto:jdnovotny;lbl.gov] Sent: 9. nóvember 2002 22:44 To: Tomcat Users List; Jetspeed Developers List Subject: retrieving remote web content Hi, I'm trying to develop a servlet that can act as a proxy for another web site-- lets' say I'm trying to provide the content of www.google.com. It seems I can retrieve and cache the HTML using a URLConnection, but what about the resources used by the HTML like gif's and jpg's. Somehow I need to parse the HTML and get those separately? Is there a library out there for doing what I describe? Maybe I'm missing something relaly simple... Thanks, Jason -- To unsubscribe, e-mail: mailto:tomcat-user- [EMAIL PROTECTED] For additional commands, e-mail: mailto:tomcat-user-help;jakarta.apache.org -- To unsubscribe, e-mail: mailto:tomcat-user-unsubscribe;jakarta.apache.org For additional commands, e-mail: mailto:tomcat-user-help;jakarta.apache.org
mod_jk Problem
Hi, I am trying to configure Apache and Tomcat to work together using connectors so that anytime a .JSP page is requested from Apache (sitting on port 80) it will automatically connect to Tomcat (port 8080). This is possible using a connector. In my case I am using mod_jk. I have Apache set up correctly and so too Tomcat i.e. I can access both the web sites at 80 and 8080 respectively. I haven't been able to link the two through the mod_jk connector. I did everything I was supposed to but no luck. I have attached the configuration files. I am using Apache 1.3 and Tomcat 4.1.12. mod_jk is mod_jk-1.3-eapi.so. Thanks, Rudolph AraujoGet more from the Web. FREE MSN Explorer download : http://explorer.msn.com conf.zip Description: Zip compressed data -- To unsubscribe, e-mail: mailto:tomcat-user-unsubscribe;jakarta.apache.org For additional commands, e-mail: mailto:tomcat-user-help;jakarta.apache.org
Problem with REALM JNDI JDBC AUTHENTICATION
I thank you for your support in advice; I have a very big problem in my project: My application on W2K , TOMCAT 4.1 ALPHA , JBUILDER 4 AND JNDI EXTENSION doesn't run when acces to resource JDBC to connect db to check authentication via REALM(i use j_security_check action form and i access to mysql db for authentication) error is CANNOT CREATE RESOURCE I THINK IT'S A CONFIGURATION PROBLEM CAN YOU HELP ME PLEASE. thank you i can give you other details if it's necessary. thanks again.
Re: RE: enable ssl on tomca
I already uncomment lines. When I run tomcat it begin to listen on 8443 port. but not in secure mode. When I browse address https://server:8443 it returns the not found message But if I write adsress as http://server:8443 it works fine. I tghougt it cant read the certificate from keystore. So I tried to import certificate by using keytool utility. But it gives the following error. Enter keystore password : Keytool error:java.io..IOException:Wrong kind of object -Original Message- From: CHAO,KENT (HP-Boise,ex1) [EMAIL PROTECTED] To: 'Tomcat Users List' [EMAIL PROTECTED] Date: Fri, 8 Nov 2002 07:53:39 -0800 Subject: RE: enable ssl on tomca This is not directly answer to your question. Just point out one other steps you didn't mention: You need to uncomment one section of code in ~\tomcat\conf\server.xml. In that section, you turn on port 8443, and specify where the keystore is. The comments above tell you what steps to turn on SSL. I did this a while ago with Tomcat 3.x on w2k. I hope it still applies. Kent -Original Message- From: Taylan KIRAN [mailto:test1;ku.edu.tr] Sent: Friday, November 08, 2002 7:03 AM To: Tomcat Users List Subject: Re: enable ssl on tomca Additional note:I am trying to enable ssl on tomcat installed on netware 6.0 sp1. - Original Message - From: Taylan KIRAN [EMAIL PROTECTED] To: Tomcat Users List [EMAIL PROTECTED] Sent: Friday, November 08, 2002 2:02 PM Subject: enable ssl on tomca I followed tomcat-ssl-howto document. I found jsse jars. they are included in CLASSPATH. After I execute the command keytool -genkey -alias tomcat -keyalg RSA it gives the following error in log console Enter keystore password : Keytool error:java.io..IOException:Wrong kind of object What should I do? Thanks -- To unsubscribe, e-mail: mailto:tomcat-user-unsubscribe;jakarta.apache.org For additional commands, e-mail: mailto:tomcat-user-help;jakarta.apache.org -- To unsubscribe, e-mail: mailto:tomcat-user-unsubscribe;jakarta.apache.org For additional commands, e-mail: mailto:tomcat-user-help;jakarta.apache.org -- To unsubscribe, e-mail: mailto:tomcat-user-unsubscribe;jakarta.apache.org For additional commands, e-mail: mailto:tomcat-user-help;jakarta.apache.org
Re: mod_jk Problem
Rudolph, check the arhives...this was just discussed yesterday... John Turner created some great howtos for it http://www.johnturner.com/howto On Sat, 2002-11-09 at 23:10, Rudolph Araujo wrote: Hi, I am trying to configure Apache and Tomcat to work together using connectors so that anytime a .JSP page is requested from Apache (sitting on port 80) it will automatically connect to Tomcat (port 8080). This is possible using a connector. In my case I am using mod_jk. I have Apache set up correctly and so too Tomcat i.e. I can access both the web sites at 80 and 8080 respectively. I haven't been able to link the two through the mod_jk connector. I did everything I was supposed to but no luck. I have attached the configuration files. I am using Apache 1.3 and Tomcat 4.1.12. mod_jk is mod_jk-1.3-eapi.so. Thanks, Rudolph AraujoGet more from the Web. FREE MSN Explorer download : http://explorer.msn.com -- To unsubscribe, e-mail: mailto:tomcat-user-unsubscribe;jakarta.apache.org For additional commands, e-mail: mailto:tomcat-user-help;jakarta.apache.org -- .: B i g D o g :. -- To unsubscribe, e-mail: mailto:tomcat-user-unsubscribe;jakarta.apache.org For additional commands, e-mail: mailto:tomcat-user-help;jakarta.apache.org
recommended reading
Hi. I am very new to the world of Tomcat and servlets/jsp. An interesting world. I would like to know if there is some recommended reading. Not about the actual configuration, that is not a problem (yet), but I am looking for something the explains the concept and philosophy behind Tomcat. Anyone have a good pointer? -- andreas -- To unsubscribe, e-mail: mailto:tomcat-user-unsubscribe;jakarta.apache.org For additional commands, e-mail: mailto:tomcat-user-help;jakarta.apache.org
Servlet returns blank html page
I have this web page on which I clicked the web link:
http://localhost:8080/example/servlet/MyServlet
I have MyServlet.java compiled and MyServlet.class is in the
WEB-INF\classes folder.
I am expecting a html page generate by the servlet,
but all I got was a blank page. Whats is incorrect?
Here is the servlet:
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class MyServlet extends HttpServlet {
public void doGet(HttpServletRequest req, HttpServletResponse
resp)
throws IOException, ServletException
{
resp.setContentType(text/html);
PrintWriter out = resp.getWriter();
out.println(HTMLHEADTITLEMy Page/TITLE/HEAD);
out.println(BODY);
out.println(P);
out.println(test);
out.println(/P);
out.println(/BODY/HTML);
out.flush();
}
public void doPost(HttpServletRequest req, HttpServletResponse
resp) throws ServletException, java.io.IOException
{
doGet(req,resp);
}
}
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RE: recommended reading
Andreas, Tomcat is the Sun reference implementation of a J2EE servlet container. This means that any book on Java Servlets should do justice to Tomcat architecture and operating principles. Many books also go into the configuration of Tomcat as an example of configuring a servlet container, simply because it is free and readers can easily get their hands on a copy to try out what they are reading, very convenient for those that want to learn Tomcat specifically :) I personally quite like the Wrox Press books, they have a book called Professional Java Servlets (http://makeashorterlink.com/?U2E525662). It will explain the intricacies of Servlets, but with little regard for how it fits into the bigger picture. If you are just getting started with servlets and JSP though, you might be better served to focus on JSP, and learn specifics about Tomcat and Servlets as you need to. A component of Tomcat called Jasper basically turns JSPs into servlets by converting the JSP source into source code for a class that extends the Servlet base class, which in turn is compiled with the Java compiler and automatically made available in the Tomcat servlet container. JSP is the simple introduction to servlets, since you don't have to worry about intricacies such as deployment descriptors, web application archives and Java coding right off the bat. As well, most experienced programmers use JSP in their projects as well, so you aren't wasting your time to become a master of JSP early on. If that sounds like something that you are interested in, another Wrox book I like is Professional JSP, Second Edition (http://makeashorterlink.com/?D5D523662). It's actually sitting on my desk, right next to my EJB book, and the servlets book is on the shelf, (an indication that the servlets stuff both isn't as important on a daily basis as well...). The first couple of chapters describe the basics of servlets and how they fit into the J2EE model (kind of what you are looking for now), then start getting into how a JSP is just a servlet, with the rest of the book devoted to techniques for getting the most out of JSP. It's over 1,100 pages, and definitely one of those books I wish that I had purchased much sooner than I actually did. Good luck, feel free to drop a line off-list... -b -Original Message- From: andreas palsson [mailto:andreas;muha.net] Sent: Saturday, November 09, 2002 7:24 PM To: [EMAIL PROTECTED] Subject: recommended reading Hi. I am very new to the world of Tomcat and servlets/jsp. An interesting world. I would like to know if there is some recommended reading. Not about the actual configuration, that is not a problem (yet), but I am looking for something the explains the concept and philosophy behind Tomcat. Anyone have a good pointer? -- andreas -- To unsubscribe, e-mail: mailto:tomcat-user-unsubscribe;jakarta.apache.org For additional commands, e-mail: mailto:tomcat-user-help;jakarta.apache.org -- To unsubscribe, e-mail: mailto:tomcat-user-unsubscribe;jakarta.apache.org For additional commands, e-mail: mailto:tomcat-user-help;jakarta.apache.org
Re: recommended reading
Dans un e-mail daté du 10/11/2002 01:24:30 Paris, Madrid, [EMAIL PROTECTED] a écrit : http://www.moreservlets.com Mohammed Hi. I am very new to the world of Tomcat and servlets/jsp. An interesting world. I would like to know if there is some recommended reading. Not about the actual configuration, that is not a problem (yet), but I am looking for something the explains the concept and philosophy behind Tomcat. Anyone have a good pointer?
Re: recommended reading
andreas palsson [mailto:andreas;muha.net] wrote: I am very new to the world of Tomcat and servlets/jsp. An interesting world. I would like to know if there is some recommended reading. Not about the actual configuration, that is not a problem (yet), but I am looking for something the explains the concept and philosophy behind Tomcat. Anyone have a good pointer? On Sat, Nov 09, 2002 at 08:36:50PM -0500, Brian Topping wrote: [...some cogent recommendations for tomcat-related reading...] I saw a book on JBOSS the other day, though I didn't have time to read it. JBOSS is an open-source J2EE web application server that uses Tomcat for the JSP/servlets piece, so it might have some sections dealing specifically with Tomcat. I'll likely pick up a copy of the book sometime soon, just on general principles. My recommendations for books on the more general topics of servlets, J2EE stuff, etc, as well as a cursory overview of J2EE, can be found at: http://darksleep.com/puff/writings/j2eeoverview.html Steven J. Owens [EMAIL PROTECTED] I'm going to make broad, sweeping generalizations and strong, declarative statements, because otherwise I'll be here all night and this document will be four times longer and much less fun to read. Take it all with a grain of salt. - Me at http://darksleep.com -- To unsubscribe, e-mail: mailto:tomcat-user-unsubscribe;jakarta.apache.org For additional commands, e-mail: mailto:tomcat-user-help;jakarta.apache.org
