Can you run a load test from another computer on the local network?
Something like apache AB gives a histogram and you should be able to
tell what percentage of your requests is the 5 seconds range. It is
best to run it directly to the tomcat private IP that is used inside
the local network, to mak
A note on reverse proxy:
request.getRemoteIP() will normally return the IP of the proxy and not
the IP of the client.
In Tomcat you will probably need to add a valve such as RemoteIPValve
(search this list) to fix the IP of the incoming request. Otherwise
your log files will show the IP of the prox
Or use apache as reverse HTTP proxy in front of Tomcat. In that case
tomcat is an HTTP server and there is nothing special to do (just
configure HTTP connector). You can put as many apache reverse proxies
as you need, tomcat configuration is agnostic to the proxies for the
most part. This will also
Another simple way to use tomcat with eclipse is to start tomcat with
remote debugging, and attach to it from eclipse. A couple of switches
in the tomcat startup script should do it.
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You have many threads that are not part of Tomcat, as Chuck mentions.
Whatever you start in the webapp you have to close as well. You can
close via a shutdown listener (Context listener), or if you use
something like Spring which already has built in shutdown hook,
implement their shutdown interfac
y vent?
E
On Wed, Dec 2, 2009 at 8:17 AM, Christopher Schultz <
ch...@christopherschultz.net> wrote:
> -BEGIN PGP SIGNED MESSAGE-
> Hash: SHA1
>
> Elli,
>
> On 12/2/2009 2:40 AM, Elli Albek wrote:
> > On your Linux box type “locale” + enter. The results
Hi,
On your Linux box type “locale” + enter. The results should be UTF 8. If not
change it. You can also set it in the file encoding java environment
variable as suggested above as extra safety measure.
Tomcat’s logic of determining the encoding from the request only applies
when Tomcat is parsin
I consider old code part of application code :) no age discrimination
when it comes to memory leaks.
>> What you describe in your memory graph is a simple memory leak.
>> Generally, I would look in that order:
>
> 1a. Old code? Look for improperly closed DB connections.
>
>> 1. Sessions
>> 2
You can try getting an object dump from a profiler and see which
objects are the source of memory starvation. Simple JSPs are very
unlikely to cause memory starvation, but you mentioned “application
code”, which implies that you have more than simple JSPs.
A few things you want to cross off your p
You can also look at squid to serve static files and load balance. So
squid fronts tomcat and your other apps. Squid can serve your static
files as well. All you have to do it make sure your static files
return a cache header like max-age, and squid will serve them without
going to the origin (tomc
Hi,
The advices given above are good. If you make this job triggered by a
servlet, then an attacker can use it to easily bring down your system
with excessive load.
You also have problems of clean shutdown. The thread pool that you
start needs to have blocking shutdown with some context listener,
Tomcat by itself as a web server can do that without too much
complexity. If you use something in front of it, then that something
need to know which domains go to tomcat as well.
You don't necessarily need to front tomcat with apache/AJP. You can
have tomcat be the web server as well, or front it
Hi,
Without knowing what your application is doing, here is something you should
look at:
External dependencies.
If your application is stable performance wise at steady state for a few
thousands of GC cycles, and then jumps in resources out of nowhere, it is
very possible that this is due to an
You can try forcing the JVM to start with UTF 8 using a JVM parameter.
-Dfile.encoding=UTF-8
Where you put it depends on how you start tomcat, I think JAVA_OPTS will do it.
This is quick and may work. You can also try to force the servlet
output stream to be in the encoding that you want from your
Which library are you using to get the external page? java.net? HttpClient?
What do you do with the page that you download? It looks from the
exception that you are writing it to the servlet IO, is that the case?
Are both of your tomcats running on the same JVM version?
E
On Wed, Nov 11, 2009 a
Actually Mark can you take a quick look at the class I sent and see if
it makes sense. I swapped juli with commons logging (which is in bin)
but now I am not sure this is necessary, this library may already be
loaded regardless of this filter.
E
---
Tomcat 5.5 version + log message when executed:
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to
Sorry Mark.
Well this class loading scheme (context class loader -> static
variable) sounds little like a bug.
Thanks for that startup class. I think it will solve a problem that we
have (using imageio). So you just add it as high up as possible in the
server.xml hierarchy?
E
--
Thomas, what is the issue with javax.imageio? Do they really use
context class loader for loading static variables?
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Managing class loaders is done in the JVM. Tomcat cannot force the JVM
to garbage collect class loaders, in the same way that it cannot force
the JVM to garbage collect any object.
If the class loader is unreachable, and all other objects that this
class loader provided are also unreachable, then t
parent child relationships.
E
On Fri, Nov 6, 2009 at 5:54 PM, Christopher Schultz
wrote:
> -BEGIN PGP SIGNED MESSAGE-
> Hash: SHA1
>
> Elli,
>
> Okay, I think we've hijacked Josh's thread enough to at least mark it as
> off topic. :)
>
> On
As Charles suggested, you need a thread dump. There is too much
complexity in your setup to be able to find your problem without
actually inspecting the machine, but a thread dump can take you right
to the source of the problem in a matter of minutes.
--
Hi,
> Elli,
>
> On 11/4/2009 7:01 PM, Elli Albek wrote:
>> I also
>> remember that closing a connection closes statements and result sets, but it
>> has been a while since I read the source.
>
> Pooled connections are almost certainly not behaving this way. T
As far as I remember, "abandoned" is a connection that was not closed. So if
you call recycle on a connection it will not generate abandoned message. The
messages that you see are from connections that you do not close. I also
remember that closing a connection closes statements and result sets, bu
2 years at my current
> > employer. Thank you all again.
> >
> > - Josh
> >
> >
> > On Mon, Nov 2, 2009 at 3:40 PM, Christopher Schultz <
> > ch...@christopherschultz.net> wrote:
> >
> >> -BEGIN PGP SIGNED MESSAGE-
> >> Hash: SHA1
>
Thanks for this link. Reading that page made me a little pessimistic.
E
On Mon, Nov 2, 2009 at 9:38 PM, Caldarale, Charles R <
chuck.caldar...@unisys.com> wrote:
> > From: Gerwood Stewart [mailto:gstew...@une.edu.au]
> > Subject: RE: Tomcat and PermGen
> >
> > Do you know of any ways to track do
A question:
Do you guys use hot deployment of applications? If you do *not*, then
Joseph’s tips are the first things to look at, in short it is the
application code keeping too many references.
If you do hot deployment, then the number of possibilities goes up
significantly. Now you are also talk
How did this make it into the tomcat users list? :)
CPAN: Driven by users. Java (JCP) Driven by vendors.
Hi,
This is how we start tomcat from ant. ${server} is your tomcat installation
directory. Then we have a condition on a URL, so we know tomcat actually
starts and handling HTTP requests.
Notice the startup folder and catalina home argument. This is to avoid
conflicts with other tomc
Oops, I had a copy paste error. Version 2 has the filter method twice.
Ignore the first, use the second. Notice this code was written in an email
client, not an IDE :)
E
Here is some idea for you:
First, you have two static methods to get and return the connection inside a
listener class. Those methods do not have anything to do with the listener
(which is an instance), and also and also do not need synchronization.
Synchronizing on getConnection can be a big bott
nly stop what it starts by itself.
E
On 10/28/09, Christopher Schultz wrote:
> -BEGIN PGP SIGNED MESSAGE-
> Hash: SHA1
>
> Elli,
>
> On 10/28/2009 12:21 AM, Elli Albek wrote:
>> In terms of listeners, I saw that Tomcat executes requests while in
>> the closi
Thanks for your replies. I agree that Tomcat should be responsible for
all objects that are configured in Tomcat, and the web app should be
responsible for objects that are created by the webapp. Currently it
does not happen properly in tomcat. This is not related to DBCP code,
it is all Tomcat cod
Hi,
More information about tomcat shutdown and object swapping probably belongs
in the development list. It is quite a bit of work to extend DBCP and write
extensions to tomcat, and at the end of the day most of those problems I
would consider as bugs. DBCP specifically cannot be easily extended, w
Hi,
I did not follow this thread form the beginning, but I can provide a
few tips about using connection pools in tomcat.
1. DBCP has quite a few problems in the area of scalability. We have
our own modified version of the source that makes it more concurrent,
and I believe some of those changes we
Where is your spring configuration file? Is it inside the war file?
When you have two hosts, do you have the war file in both? If this is he case
you may deploy the entire war file twice. Generally a deployed war file can run
only in one host. If you run it in two hosts, you are deploying the en
hread after the server is
completely started. I have not used Server LifeCycleListener before. I will
give it a try. Appreciate any help. Thanks.
On Thu, Oct 22, 2009 at 7:48 PM, Elli Albek wrote:
> If this is the case you can assume that the war file is deployed.
>
> I don't trust the
Load the properties using java.util.Properties, and store them in a place that
is accessible in the war (like a static variable or context attribute).
If you are thinking about properties such as database/mail server connections,
then keep the OUTSIDE of the war file, not in XML or other things
spawned from the contextInitilized
method of a ServletContextListener.(Inside the war)
On Wed, Oct 21, 2009 at 11:53 PM, Elli Albek wrote:
> Where does the code that needs to know that reside? How is it initialized?
> Is it inside tomcat (war file
This is my concern as well. Our custom login valve is using values from the
form authentication valve that are not accessible in the war file. For example
they allow reconstruction of a post request and replacing roles and principals,
which I doubt can be done with a filter in a simple way witho
Where does the code that needs to know that reside? How is it initialized? Is
it inside tomcat (war file, valve, JNDI resource) or outside the tomcat JVM?
E
- Original Message -
From: Anup K Ram
To: users@tomcat.apache.org
Sent: Wed, 21 Oct 2009 16:56:50 -0700 (PDT)
Subject: How to know
Tomcat with
x-forwarded-for="@clientIp,
@the-trusted-proxy-that-is-not-the-load-balancer"
Does it make sense ?
Cyrille
--
Cyrille Le Clerc
clecl...@xebia.fr cyri...@cyrilleleclerc.com
http://blog.xebia.fr
On Wed, Oct 21, 2009 at 6:57 AM, Elli Albek wrote:
>
> A quest
> My initial response to that article is that it's vague drivel.
> "If you are an incredibly savvy and experienced web developer, no doubt
> you already have a DreamHost account" - should be all you need to read
> to make a reasonable critical assessment of the quality of this article.
:)
bia-france/wiki/XForwardedFilter
On Mon, Oct 5, 2009 at 11:19 PM, Elli Albek wrote:
>
> Hi,
>
> We can add the header to the custom valves, but then in addition we have to
> change a few log file configurations, create a servlet filter and maybe
> something else I cant think of n
So is there still going to be an API to plug into the tomcat internals and do
things that the servlet API does not support?
E
-Original Message-
From: Cyrille Le Clerc [mailto:clecl...@xebia.fr]
Sent: Tuesday, October 20, 2009 4:06 PM
To: Tomcat Users List
Subject: Re: Valves being conv
client IP without requiring the same code
again.
*
* @author Elli Albek, www.sustainlane.com
*/
public class RemoteIPValve extends ValveBase {
private static final Pattern ipExpr =
Pattern.compile("^[\\da-fA-F]+(\\.[\\da-fA-F]+)+");
private String forwardedForH
execute before the filters.
-Tim
Christopher Schultz wrote:
> -BEGIN PGP SIGNED MESSAGE-
> Hash: SHA1
>
> Mark,
>
> On 10/2/2009 5:55 AM, Mark Thomas wrote:
>> Elli Albek wrote:
>>> A few reasons why not to do this as a servlet filter:
>>>
>>
- Original Message -
From: Christopher Schultz
To: Tomcat Users List
Sent: Fri, 2 Oct 2009 07:32:06 -0700 (PDT)
Subject: Re: Cannot set remote address in valve (Tomcat 5.5)
>> 2. There are other valves like request filters that cannot work without the
>> correct IP, as well as custom l
A few reasons why not to do this as a servlet filter:
1. There are many web apps on the server and I don't want to include the
filter in each.
2. There are other valves like request filters that cannot work without the
correct IP, as well as custom login valve.
3. We have a few environments and I
Cannot set remote address in valve (Tomcat 5.5)
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1
Elli,
On 9/27/2009 12:19 AM, Elli Albek wrote:
> public void setRemoteAddr(String remoteAddr) {
> // Not used
> }
>
> The variable is protected so I cannot access it dir
Thanks for the response. Is there any problem in fixing this method to actually
set the variable (which is already in the class)?
I think the set methods should actually set the values, so others can write
such extensions without putting their code in the apache packages.
Right now I guess the
Hi,
We have Tomcat behind a load balancer. The servlet API and tomcat libraries
see the load balancer IP as the client IP.
I tried to write a simple valve which will extract the IP from HTTP header
X-Forwarded-For
and continue the valve chain using this IP as the client IP. This will be
the first
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