Hi all,
I have been reading several messages about writing files inside a web
application, but I found no answer regarding my problem.
I need to write files on the file system that can be accessible with a
browser(I write images).
- The most reliable solution I found was to use the webapp's
if you have apache server, you can write file to its home dir, and then use
http://youdomain/image_dir/image_name.suffix to view.
On 8/7/06, Romain Quilici [EMAIL PROTECTED] wrote:
Hi all,
I have been reading several messages about writing files inside a web
application, but I found no answer
Thanks for the answer,
this solution was part of my investigation, and was actually the first
idea I had.
The problem with this approach is I don't know how to access the
/image_dir/ from within my web application.
Maybe using something like
String path = servletContext.getRealPath(/);
String
Hi,
Here are few steps of achieving it (just tested, and it works):
1. use FileOutputStream or any output streaming object to write a image file
into the directory
in Windows, the path string should look like:
c:\apache_home\httpdocs\images\1.jpg
in unix/linux, the path should look like
Hi,
thanks for the advice,
But I want to avoid harcoded links such as $APACHE_HOME\httpdocs\images
or a href=http://yourdomain/images/1.jpg; in my jsp.
Indeed I don't want to modify these values if I decide Tomcat to run on
another port, or to install Tomcat in another directory or even OS.
Hi,
It is not advisable to make your webapp dir writable, can you tell me
what exactly would you like to achieve so that I may get more info to
help out ...
On 8/7/06, Romain Quilici [EMAIL PROTECTED] wrote:
Hi,
thanks for the advice,
But I want to avoid harcoded links such as
Hi,
Hope I will be clear enough:
One part of my web application receives encodes stream that it has to
convert to jpg images. When an image is written on the server, it
notifies a Servlet which pushes the name (or the url) of the newly
generated image inside client browser(thanks to
Hi,
to avoid using absolut paths you can find that out on runtime by
getContext().getRealPath(/) - will return your path to the root
regards
On 8/7/06, Romain Quilici [EMAIL PROTECTED] wrote:
Hi,
Hope I will be clear enough:
One part of my web application receives encodes stream that it
I agree with you, but
getContext().getRealPath(/), will return the path to my webapp root,
so it means I am going to create my image dir under my webapp, which is
fine unless my application is deployed in a war file.
In such case I won't be able to write in my webapp.
Maybe using
String path =
Oh I see,
something like that , i do not think taht this will work
String imagePath = path+../imagedir;
but you will have to either convert path to instance of directory
object, or chop of the end by some string functions , using String
imagePath = path+../imagedir; as path works for browser
You can use a servlet init param inside web.xml for avoiding hardcoded
solutions.
e.g.
context-param
param-nameMY_PATH/param-name
param-valuec:\my\path\to\imgs/param-value
/context-param
On 8/7/06, Romain Quilici [EMAIL PROTECTED] wrote:
Hi,
Hope I will be clear enough:
One part of my web
For those of you who ever have this problem
Symptoms
1) Cannot connect to tomcat after a period of time
2) Heavy load on startup
3) Various strangeness with SSL certs e.g. WEB browsers reject
certs/incomplete TLS handshake
Observed case
Tomcat version we tried jakarta-tomcat-5.0.12 and
Hello
would you pleas help me with this ,
when I am trying to decompile a class file with javap -c myclass.class I
am receiving following error :
Error: Binary file myclass contains com.cnsw.reveiw.conf
how can I decompile the class file that contain another class , also I
want to use it
* Oscar Mechanic wrote (07/08/06 12:04):
For those of you who ever have this problem
Symptoms
1) Cannot connect to tomcat after a period of time
2) Heavy load on startup
3) Various strangeness with SSL certs e.g. WEB browsers reject
certs/incomplete TLS handshake
Observed case
One solution which is often mentioned to this question is to return a URL to
a servlet which knows how to generate the .jpg image as its response. Set
the context type appropriately, and write the JPEG bytes to the output
stream.
Tim
-Original Message-
From: Mohsen Saboorian
Oscar Mechanic wrote:
For those of you who ever have this problem
When starting a new thread (ie sending a message to the list about a
new topic) please do not reply to an existing message and change the
subject line. To many of the list archiving services and mail clients
used by list
The quick answer:
Do not mess with classpath. Tomcat has a very specific classloader
hierarchy. See
http://tomcat.apache.org/tomcat-5.5-doc/class-loader-howto.html for
details. If this does not answer your question, please post a more
detailed message with specifics.
--David
Julien
Question: Is the other computer you are trying to contact tomcat from
on the same subnet or outside your cable router. I ask because
192.168.x.x addresses are not routeable. You can get around that with
config settings in your cable router, check the docs for details.
Outside of that,
Tomcat does not explicitely use any specific classpath outside of it's
own. It even ignores the system set CLASSPATH variable. Check your
config settings and webapp for references to ~/cvs/fable/* directory.
--David
Ryan O'Hara wrote:
I think I found a promising lead to what is going wrong
Your log message sited below is not related to accessing jpl.jar. It's
just a message stating it couldn't use the new native APR connector and
is falling back to the traditional Coyote connector.
As far as an external jar file, best practice is include it in your
webapp in WEB-INF/lib. In
I have tried to upgrade from apache-2.0.54/tomcat-5.5.9 to
apache-2.2.3/apache-5.5.17 (also tried with apache-2.0.59).
When I use this UseBean at index.jsp (root of webapplication):
jsp:useBean id=conn_applikationsinfo scope=request
class=internet.database.SimpleUseOfConnectionPool /
I have
Thanks David,
Again, I want to start the prolog engine, so I need to load the
library of prolog when I start Tomcat 5.5.17. I think the command line
is: java -Djava.library.path=$PLLIBDIR $1
But I do not know where to put this command line in Tomcat in order to
load the prolog library when
Holger Klawitter wrote:
I have written a webapplication with I would like to distribute as a war file
amongst a few hosts. There is a resource in the context file which needs some
individual configuration per server.
* I used to unpack directly into the webapps directory and doing the
where can I find more information about old way ?
On 8/7/06, Mikolaj Rydzewski [EMAIL PROTECTED] wrote:
Holger Klawitter wrote:
I have written a webapplication with I would like to distribute as a war file
amongst a few hosts. There is a resource in the context file which needs some
I had a similar question, earlier... There is another issue here: you are
right that WAR files are expanded back into a folder - at least by default -
so one could still create a folder within the web app to write to, and which
is visible to browsers... Until one deploys an updated WAR file.
From: Rahul Sood [mailto:[EMAIL PROTECTED]
Now when I try to access the app using the following url
http://192.168.15.100:8080/sample from my machine it works fine.
But if i go to another machine, I am not able to access the
website.
Have you checked your firewall settings? That's the
Markus wrote on Monday, July 31, 2006 5:39 PM:
Markus wrote on Monday, July 31, 2006 5:34 PM:
I've got the following problem on one server using Apache 2.0.54-5
(Debian x86) with mod_jk 1.2.15 (self-compiled) and tomcat 5.5.17: I try
to
create a redirect to a page with a session-id if there
This past week is my first experience/time working w/ tomcat so please bear w/
me. I think I have most of it figured out, the server seems to be running ok
and I've successfully limited the connections to it to ssl only by a couple of
hacks to the server.xml config file[1] The one final thing I
I have a couple of questions about the performance of my code, but I'm
going to ask them in separate threads.
The first one is, if I have this loop:
for ( ii = 0; ii data.length; ii++ ) {
where data is defined as byte[] , is the .length property evaluated each
time through the loop,
By the way, this code is in a servlet running under 5.5.12, if it matters.
David Kerber wrote:
I have a couple of questions about the performance of my code, but I'm
going to ask them in separate threads.
The first one is, if I have this loop:
for ( ii = 0; ii data.length; ii++ ) {
So, you need a directory where you can write files and serve them to
the web, and you don't want that directory to be hard-coded in your
application.
First, you need a way to specify the directory when the app is
installed. (In general your app may need a bunch of configuration
settings.) There
data.length is evaluated each time.
here's the example to demonstrate it:
public class TestLoop {
public static void main(String a[]){
byte data[] = new byte[10];
int counter = 0;
for (int i=0; idata.length; i++){
thats ugly, why don't you tokenize it into string pairs, store the
pairs and works with them?
leon
On 8/7/06, David Kerber [EMAIL PROTECTED] wrote:
This code is part of a servlet running in TC 5.5.12, jre ver 1.5.0.6.
I use this code to break out individual data fields from a line which is
From: David Kerber [mailto:[EMAIL PROTECTED]
It is
executed for over 2 million data lines per day, so this routine is
executed over 10 million times per day.
[snippet of code that parses the line each time elided]
Opinion: You're optimising the wrong piece of code.
You're calling this 5
Thanks for the help!
Leon Rosenberg wrote:
data.length is evaluated each time.
here's the example to demonstrate it:
public class TestLoop {
public static void main(String a[]){
byte data[] = new byte[10];
int counter = 0;
for (int i=0; idata.length; i++){
typically, when I've installed Tomcat, and always on Windows, be it testing
with a box at home or on a server at work, I've simply unipped it to my C or D
drive.
But I was able to create it as a service nonetheless w/.o any additional
registry keys.
I think it mainly needs the service set up
I'm not sure how to Split it on the , put it into a suitably keyed
structure such as a Map other than the way I'm doing it already, unless
I'm not understanding your suggestion. So I think I need to give a bit
more info about how this is used:
I can't control the data coming in; it's from a
See my response to Peter; I can't control the format of that data string
(it's from a different application). I just need to split out the data
fields and store them away in a disk file. Or am I missing the point of
your suggestion?
Dave
Leon Rosenberg wrote:
thats ugly, why don't you
probably a firewall!
-Original Message-
From: Rahul Sood [mailto:[EMAIL PROTECTED]
Sent: Saturday, August 05, 2006 9:03 AM
To: users@tomcat.apache.org
Subject: apache Tomcat webserver problem
Hello.
pI have set up tomcat's service catalina to have the default host
192.168.15.100 and
Since this is an application in production, i cannot add in any
instrumentation to enable JConsole or JMX information. What i have
currently to work with is the Tomcat status at page
http://server:8009/status/status and that has information like :
jk-8009 Max threads: 400 Min spare threads: 375
Is it possible to change mod_jk's load-balacing algorithm to random (from
round robin)?
If yes, how?
TIA
Sidd
-
To start a new topic, e-mail: users@tomcat.apache.org
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional
From: David Kerber [mailto:[EMAIL PROTECTED]
Is there a more efficient split method I could use? Or am I
completely missing the point of what you are suggesting?
I think you've slightly missed the point. I assume you're calling your
function 5 times, each with a different field name that
are you rewriting the URLs in each of the pages to maintain the session?
each URL should get modified as a result:
/path/to/file.jsp;jsessiond=00?q=param
what's your jk config?
(unless i've missed something, and given that most people seem to get
this to work OK, it's probably a problem
here's another obvious question:
if you're in a servlet, and you're getting an separated string from
somewhere, where is the somewhere that you're getting it from?
does the servlet activate and collection the data somehow, or does the
data get sent to the servlet (in, for example the query
Ramdas,
JConsole or any JMX tool would just give you a slightly more information. I
am not sure how much more helpful it would be.
With JConsole you would be able to look at the memory usage, heap stats,
connector information, database pool sizes, etc. and with that information
you would
mod_jk neither supports round-robin, nor random load-balancing.
Currently you can choose between three algorithms:
method=B (busyness): choose the worker with the lowwest number of
requests currently in processing.
method=R (requests): choose the worker that did the lowest number of
Peter Crowther wrote:
From: David Kerber [mailto:[EMAIL PROTECTED]
Is there a more efficient split method I could use? Or am I
completely missing the point of what you are suggesting?
I think you've slightly missed the point. I assume you're calling your function 5 times, each with a
Pid wrote:
here's another obvious question:
if you're in a servlet, and you're getting an separated string from
somewhere, where is the somewhere that you're getting it from?
does the servlet activate and collection the data somehow, or does the
data get sent to the servlet (in, for example
Oh ok. I am not sure how I got the round-robin thing in my head.
Anyhow, how does one configure this?
I assume this is load balancer worker type configuration.
-Original Message-
From: Rainer Jung [mailto:[EMAIL PROTECTED]
Sent: Monday, August 07, 2006 1:15 PM
To: Tomcat Users List
Hello
We are using the new Busyness method with 1.2.18
We have also using 'sticky sessions'.
Clarification on
As soon as there will be real load, behaviour will differ.
We have 9 nodes on 3 identitical servers with identical settings, lb
factor equal on all nodes, but we see one node which had
I am using JBoss and JSF. Can anyone recommend a chat software that enables
instant conversation between two users? It is better to be open source, support
audio and file transfer. Thanks!
-
Yahoo! Music Unlimited - Access over 1 million
We have a 12 (tomcat 5.5.16) instance cluster on 4 physical machines running
redhat linux. There is an Apache installed on each machine (4 mod_jks). Each
mod_jk's worker.properties is configured exactly the same way i.e. each
mod-jk load-balances across all 12 tomcat instances. All instances have
Hello,
When configuring tomcat for HTTPS, how does tomcat know which key to
use? If you run the keytool command multiple times, you generate
multiple keys. The keys are stored in the .keystore file and so if I
generate multiple keys, which one gets picked?
Thanks,
Will
Cheers, Mark.
On 8/7/06, Mark Thomas [EMAIL PROTECTED] wrote:
Jack Ashburn wrote:
Hi,
I'm configuring my Tomcat server so that it uses a strong cipher for
SSL. From the docs in both Tomcat 4.1 and 5.0, the ciphers attribute
for the connector element in server.xml accepts A comma seperated
Hi Rainer,
Wonderful, many many thanks - your patch worked beautifully. I have no more
errors with 1.3.27 on Solaris 8 nor Linux.
(my apologies for the delay - I wasted time experimenting with the patch
command on Solaris and Linux :-(
I am opening another email thread about some strange
Hi Moises,
Actually I am not trying to call it. I am hoping as per servlet 2.4 spec
there is some mechanism of getting HttpSession before it is destroyed.
My sessionListener class checks for some session attribute and updates
some bits in database. In case of session timeout by the time
Hi,
I tried to upgrade an older version of the win32 JK isapi_redirect.dll
to the jk-1.2.18 version that I downloaded from
http://mirrors.ibiblio.org/pub/mirrors/apache/tomcat/tomcat-connectors/jk/binaries/win32/jk-1.2.18. For some reason, IIS is not able to load the ISAPI filter. It errors
Lars Nielsen Lind wrote:
All my webapps and contents (including WEB-INF and components) are
copied from an existing running solution with no problems.
Anyone that know how to solve this?
Is there a more complete stack trace and/or exception in the logs?
Mark
Minh Tu Thanh Tran wrote:
Thanks David,
Again, I want to start the prolog engine, so I need to load the
library of prolog when I start Tomcat 5.5.17. I think the command line
is: java -Djava.library.path=$PLLIBDIR $1
But I do not know where to put this command line in Tomcat in order to
FH wrote:
This past week is my first experience/time working w/ tomcat so please bear w/
me. I think I have most of it figured out, the server seems to be running ok
and I've successfully limited the connections to it to ssl only by a couple of
hacks to the server.xml config file[1] The one
Hi,
first of all I assume you are using version 1.2.18 of mod_jk? Otherwise
please update.
Sharma, Siddharth schrieb:
We have a 12 (tomcat 5.5.16) instance cluster on 4 physical machines running
redhat linux. There is an Apache installed on each machine (4 mod_jks). Each
mod_jk's
Hi,
I have a lightweight singleton that I need to place in shared/lib so
that it may be accessed by a few other webapps. My question is what
logging jar will make my life the easiest to use in my singleton? My
assumption is that each webapp should be able to configure which classes
it
Hi,
Mohan Wickramasinghe schrieb:
Hello
We are using the new Busyness method with 1.2.18
We have also using 'sticky sessions'.
Clarification on
As soon as there will be real load, behaviour will differ.
We have 9 nodes on 3 identitical servers with identical settings, lb
factor
David Kerber wrote:
I haven't run a profiler on this code; I've tried, but getting the
configuration figured out has stumped me every time.
I have had good results with YourKit. Simple to set up and a nice
output that shows where the time is spent. I have used to to
investigate reported
William Chu wrote:
Hello,
When configuring tomcat for HTTPS, how does tomcat know which key to
use? If you run the keytool command multiple times, you generate
multiple keys. The keys are stored in the .keystore file and so if I
generate multiple keys, which one gets picked?
By default,
you are right Moises, if you really wanna write to somewhere within
the webapp deploy folder, a better is to make a soft symbol link point
to the directory that stores the image,
catalina_home/webapps
--- your_web
image_dir --- /tmp/images/
so next time
Hello
Thaks. We will enable loggin to find this, but since its a production setup
will it affect performance ?
This is a set of stats. Apache was running for 3 weeks. (Hope this is clear)
mod_jk 1.2.18 with Busyness and sticky sessions (all nodes are identicical).
Name Type jvmRoute
Hi all,
thanks a lot for all solutions proposed.
I think I am going create the directory within my webapp, but without
symbolic link, as my images are temporary files.
So even if the directory is deleted it really does not matter
Thanks again
Romain
Li wrote:
you are right Moises, if you
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