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Posted to users@tomcat.apache.org by fachhoch <fa...@gmail.com> on 2013/03/12 15:43:53 UTC
tomcat 6.0.35 in production maintaince
I am using tomcat 6.0.35 in production. I am running my web application
on this , It uses spring, wicket, hibernate and lot of other
technologies, problem is after one month of running my application I get out
of memory error perm gen space could not serialize mybject... .
I am using wicket framework which serializes lot of stuff in memory I
think it is serializing lot of stuff and not enough memory is available to
serialize .
After restart the server is good for approx one month.
How can I detect in advance that my app is using up all available memory ?
I am not a server administrator or system admin, I am just a developer and
right now managing my production servers.
This out of memory perm gen space error could this be because of some
memory leak ?
can I run gc once in week on running tomcat should we do this for server
good health , earlier our deployment team used to deploy this and we never
had out f memory issue.
is there any maintenance necessary for production servers if so what are
those ?
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Re: tomcat 6.0.35 in production maintaince
Posted by Shanti Suresh <sh...@umich.edu>.
On Tue, Mar 12, 2013 at 1:48 PM, Caldarale, Charles R <
Chuck.Caldarale@unisys.com> wrote:
>
> > is there any maintenance necessary for production servers if so what
> > are those ?
>
> Health monitoring is always useful.
>
> http://wiki.apache.org/tomcat/FAQ/Monitoring
> http://wiki.apache.org/tomcat/FAQ/Performance_and_Monitoring
>
> - Chuck
>
As Chuck pointed out, find out what's causing the leak.
Some commands that might help include:
This command will print the PermGen memory usage in MB:
${JRE_HOME}//bin/jstat -gcold ${TOMCAT_PID} | /usr/bin/tail -1 | awk -F' '
'{print $2/1024}'
This command will give you a helpful snapshot of what's occupying PermGen:
${JRE_HOME}/bin/jmap -permstat ${TOMCAT_PID}
Thanks,
-Shanti
RE: tomcat 6.0.35 in production maintaince
Posted by Leo Donahue - RDSA IT <Le...@mail.maricopa.gov>.
>-----Original Message-----
>From: Caldarale, Charles R [mailto:Chuck.Caldarale@unisys.com]
>Subject: RE: tomcat 6.0.35 in production maintaince
>
>> From: fachhoch [mailto:fachhoch@gmail.com]
>> Subject: tomcat 6.0.35 in production maintaince
>
>> How can I detect in advance that my app is using up all available memory ?
>
>Monitor the JVM with any of a myriad of tools, such as VisualVM.
>
>http://wiki.apache.org/tomcat/FAQ/Memory
>http://wiki.apache.org/tomcat/FAQ/Troubleshooting_and_Diagnostics
>
>> This out of memory perm gen space error could this be because of some
>> memory leak ?
>
>Pretty much guaranteed that one or more of your webapps is leaking.
>
The default permgen space is 64MB.
Could it also run out of permgen space if you deploy many web applications that don't leak, which exhausts the default permgen memory allocation? Is the wording on this page accurate?
http://docs.oracle.com/javase/6/docs/technotes/guides/visualvm/monitor_tab.html
[quote]
PermGen. The PermGen graph displays changes in the permanent generation area over time. The permanent generation is the area of the heap where class and method objects are stored. If an application loads a very large number of classes, then the size of the permanent generation might need to be increased using the -XX:MaxPermSize option.
[/quote]
Leo
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RE: tomcat 6.0.35 in production maintaince
Posted by "Caldarale, Charles R" <Ch...@unisys.com>.
> From: fachhoch [mailto:fachhoch@gmail.com]
> Subject: tomcat 6.0.35 in production maintaince
> How can I detect in advance that my app is using up all available memory ?
Monitor the JVM with any of a myriad of tools, such as VisualVM.
http://wiki.apache.org/tomcat/FAQ/Memory
http://wiki.apache.org/tomcat/FAQ/Troubleshooting_and_Diagnostics
> This out of memory perm gen space error could this be because of some
> memory leak ?
Pretty much guaranteed that one or more of your webapps is leaking.
http://wiki.apache.org/tomcat/MemoryLeakProtection
> can I run gc once in week on running tomcat
Pointless; the JVM is doing that automatically.
> earlier our deployment team used to deploy this and we never
> had out of memory issue.
So what did they break with the most recent deployment?
> is there any maintenance necessary for production servers if so what
> are those ?
Health monitoring is always useful.
http://wiki.apache.org/tomcat/FAQ/Monitoring
http://wiki.apache.org/tomcat/FAQ/Performance_and_Monitoring
- Chuck
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RE: tomcat 6.0.35 in production maintaince
Posted by "Caldarale, Charles R" <Ch...@unisys.com>.
> From: fachhoch [mailto:fachhoch@gmail.com]
> Subject: Re: tomcat 6.0.35 in production maintaince
> how can I figure this out ?
Use the manager app, as suggested.
> are there any suggested ways to use threadlocal when deployed in tomcat ?
Using ThreadLocal when the threads belong to a pool is rather tricky, and often leads to memory leaks. Try to avoid it, if possible.
> I dont have manager app , I just have my application I removed all others
> apps from tomcat.
So put it back in.
- Chuck
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Re: tomcat 6.0.35 in production maintaince
Posted by fachhoch <fa...@gmail.com>.
I did not any change the default setting for session timeout so it shoule be
30 minutes.
I do have some jsp very few but these are used by external application to
check if my app is alive they call this jsp every 10 minutes or frequent
intervals, also I have a jquery time out plugin which calls a jsp every 5
minutes to keep session alive also it takes care of timing out due to
inactivity .
redeplyments I do by restarting the server , I always restart the server.
number of session could this be because of
http://tomcat.apache.org/tomcat-6.0-doc/config/manager.html#Persistence_Across_Restarts
?
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Re: tomcat 6.0.35 in production maintaince
Posted by Christopher Schultz <ch...@christopherschultz.net>.
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Fachhoch,
On 3/14/13 8:01 AM, fachhoch wrote:
> I added all my jsp with <%@ page session="false" %> still
> session count is increasing , is there any session listner which
> will debug all session creation ,time ,ipaddress etc and session
> destroy
You can write your own: they are trivial to write if you just want to
log what code is creating the session. Capturing information about the
request is less easy: you have to write a Filter that wraps the
requests and instruments them. That's also fairly easy but does
require a certain amount of familiarity with the Servlet API.
- -chris
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Re: tomcat 6.0.35 in production maintaince
Posted by "Mark H. Wood" <mw...@IUPUI.Edu>.
On Thu, Mar 14, 2013 at 07:13:20AM -0700, fachhoch wrote:
> every few seconds a new session is begin created from an ipaddress , I have
> no clue who owns that ipaddress , how can I find more about that
> ipaddress?
'whois'.
--
Mark H. Wood, Lead System Programmer mwood@IUPUI.Edu
There's an app for that: your browser
Re: tomcat 6.0.35 in production maintaince
Posted by Daniel Mikusa <dm...@vmware.com>.
On Mar 14, 2013, at 6:00 PM, fachhoch wrote:
> I think one of my filters are involved in creating session , I tried in dev
> box calling the url called by load balancer ,and saw that a session is
> getting created every time its a new browser, so then I called a html
> file still session is being created, I use some of the filters which I
> cannot make changes to, so I am, wondering , If I can add something like
> a filter in web.xml which will bypass all other filters if url is lets say
> /myaap/ping.html how to bypass all other filters and serve the request ?
You could, but I think you're making this more complicated than it needs to be. If the filter is creating a session, then just change the filter-mapping so that it isn't applied for this resource. In your web.xml, look for the "filter-mapping" tag for the filter that is starting the session then just change it so the filter ignores this resource.
Having said that, if you absolutely want to create a custom filter, try the following:
1.) Implement Filter
2.) In the doFilter method, if request is a ping, handle it otherwise continue filter chain
3.) Define your filter in web.xml, make sure it's first in the filter chain
Now your filter should execute first, if it's a ping request it will just handle it. If not, it'll continue down the filter chain like normal.
Dan
>
>
>
>
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Re: tomcat 6.0.35 in production maintaince
Posted by fachhoch <fa...@gmail.com>.
I think one of my filters are involved in creating session , I tried in dev
box calling the url called by load balancer ,and saw that a session is
getting created every time its a new browser, so then I called a html
file still session is being created, I use some of the filters which I
cannot make changes to, so I am, wondering , If I can add something like
a filter in web.xml which will bypass all other filters if url is lets say
/myaap/ping.html how to bypass all other filters and serve the request ?
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Re: tomcat 6.0.35 in production maintaince
Posted by fachhoch <fa...@gmail.com>.
I added the access log and now I know what url is being called , this is
the url I configured my loadbalancer to check application is running
fine. The url is of a servlet , this servlet sure does not create session
and it forwards to a jsp using
the jsp is
I am not creating any session with these two , resources ,am i?
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Re: tomcat 6.0.35 in production maintaince
Posted by Daniel Mikusa <dm...@vmware.com>.
On Mar 14, 2013, at 10:56 AM, fachhoch wrote:
> mine app is running behind amazon load balancer may be its ipaddress from
> that aws , I dont know , but all I care is not to create session , to aws
> load balancer I gave the url to ping my app which is a servlet and this
> forwards to jsp in that jsp I have
> <%@ page session="false" %>
>
> this should not create a session , may be some thing else is creating
> a new session.
That's certainly possible.
> is there any way I can figure out what was the request resource being
> called every few minutes
Configure an AccessLogValve if you don't have one already. Then look at the log to see what URL the IP address is requesting.
https://tomcat.apache.org/tomcat-6.0-doc/config/valve.html#Access_Log_Valve
> and which request resource is creating new session
Look at your code. Setting "session=false" in your JSP will simply stop the JSP from creating a session by default. If your code attempts to accesses the session at any point, that will also cause a session to be created.
Dan
>
>
>
>
>
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Re: RE:tomcat 6.0.35 in production maintaince
Posted by fachhoch <fa...@gmail.com>.
mine app is running behind amazon load balancer may be its ipaddress from
that aws , I dont know , but all I care is not to create session , to aws
load balancer I gave the url to ping my app which is a servlet and this
forwards to jsp in that jsp I have
<%@ page session="false" %>
this should not create a session , may be some thing else is creating
a new session.
is there any way I can figure out what was the request resource being
called every few minutes and which request resource is creating new session
?
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RE:tomcat 6.0.35 in production maintaince
Posted by Eugène Adell <Eu...@d2-si.eu>.
Maybe a monitoring tool (NAGIOS/PATROL/..) which is checking if the site is available ?
________________________________________
De : fachhoch [fachhoch@gmail.com]
Envoyé : jeudi 14 mars 2013 15:13
À : users@tomcat.apache.org
Objet : Re: tomcat 6.0.35 in production maintaince
every few seconds a new session is begin created from an ipaddress , I have
no clue who owns that ipaddress , how can I find more about that
ipaddress?
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Re: tomcat 6.0.35 in production maintaince
Posted by David kerber <dc...@verizon.net>.
On 3/14/2013 10:27 AM, fachhoch wrote:
> how can I block it , can I do it from my app or server setting or os
> setting , please advice me .
Firewall or OS-level.
>
>
>
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Re: tomcat 6.0.35 in production maintaince
Posted by Hassan Schroeder <ha...@gmail.com>.
On Thu, Mar 14, 2013 at 7:39 AM, Daniel Mikusa <dm...@vmware.com> wrote:
>> how can I block it
> If your OS has a firewall, you could use that.
If you're on a *nix system, see the man page for 'iptables' and/or
'tcp_wrappers'.
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http://about.me/hassanschroeder
twitter: @hassan
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Re: tomcat 6.0.35 in production maintaince
Posted by Daniel Mikusa <dm...@vmware.com>.
On Mar 14, 2013, at 10:27 AM, fachhoch wrote:
> how can I block it , can I do it from my app or server setting or os
> setting , please advice me .
If your OS has a firewall, you could use that. Otherwise, you can configure a Remote Address Filter in Tomcat. Configuration of the filter is pretty simple, but if you need an example you should be able to find one on Google pretty quickly.
https://tomcat.apache.org/tomcat-6.0-doc/config/valve.html#Remote_Address_Filter
Dan
>
>
>
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Re: tomcat 6.0.35 in production maintaince
Posted by Christopher Schultz <ch...@christopherschultz.net>.
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Hash: SHA256
Eugène,
On 3/14/13 10:40 AM, Eugène Adell wrote:
> Sure,
>
> you can block any IP by configuring a VALVE in the main config
> file (server.xml) :
> http://tomcat.apache.org/tomcat-6.0-doc/config/valve.html#Remote_Address_Filter
This
>
requires a server restart. You can also block at the context level,
but this requires a context restart.
> Or if you are running Linux, you can configure the IPTABLES. This
> one is more expensive to do.
iptables is more expensive? Sorry, no: it is much cheaper in terms of
OPs time, CPU time, and (lack of) downtime.
- -chris
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RE:tomcat 6.0.35 in production maintaince
Posted by Eugène Adell <Eu...@d2-si.eu>.
Sure,
you can block any IP by configuring a VALVE in the main config file (server.xml) :
http://tomcat.apache.org/tomcat-6.0-doc/config/valve.html#Remote_Address_Filter
Or if you are running Linux, you can configure the IPTABLES. This one is more expensive to do.
________________________________________
De : fachhoch [fachhoch@gmail.com]
Envoyé : jeudi 14 mars 2013 15:27
À : users@tomcat.apache.org
Objet : Re: tomcat 6.0.35 in production maintaince
how can I block it , can I do it from my app or server setting or os
setting , please advice me .
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Re: tomcat 6.0.35 in production maintaince
Posted by fachhoch <fa...@gmail.com>.
how can I block it , can I do it from my app or server setting or os
setting , please advice me .
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Re: tomcat 6.0.35 in production maintaince
Posted by Daniel Mikusa <dm...@vmware.com>.
On Mar 14, 2013, at 10:13 AM, fachhoch wrote:
> every few seconds a new session is begin created from an ipaddress , I have
> no clue who owns that ipaddress , how can I find more about that
> ipaddress?
>
Block it and see who complains that they can no longer access your server?
Dan
>
>
>
>
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Re: tomcat 6.0.35 in production maintaince
Posted by fachhoch <fa...@gmail.com>.
every few seconds a new session is begin created from an ipaddress , I have
no clue who owns that ipaddress , how can I find more about that
ipaddress?
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Re: tomcat 6.0.35 in production maintaince
Posted by fachhoch <fa...@gmail.com>.
I added all my jsp with <%@ page session="false" %> still session count
is increasing , is there any session listner which will debug all session
creation ,time ,ipaddress etc and session destroy atleast I can see
where the session are coming from.
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Re: tomcat 6.0.35 in production maintaince
Posted by Christopher Schultz <ch...@christopherschultz.net>.
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Fachhoch,
On 3/13/13 11:55 AM, fachhoch wrote:
>> Hard to say exactly. Perhaps your session expiration time is
>> large and sessions are not being removed as quickly as you would
>> expect.
>
> how can I figure this out ?, I am did not make any setting for
> session timeout ,except for browser activity where to check
> session expiration configration?
Default is 30 minute session timeout. You would have set this in
web.xml if you had changed the default.
More likely is that you have some (all?) JSPs that create sessions
because session="false" isn't set in them, and you maybe use them from
scripts or something like that, where cookies set in a response are
ignored. Every request -> new session.
We had that problem on a server recently that we never expect to have
sessions, but it always had 6 sessions active. It was because our
monitoring service was hitting a JSP to check the "liveness" of the
server and creating a new session every few minutes. Adding
session="false" eliminated all of the sessions (after 30 minutes, of
course).
> are there any suggested ways to use threadlocal when deployed in
> tomcat ? I am using thread local as advised in any tutorial, any
> special care must be taken with threadlocal for tomcat ?
Yes, your best bet would be not to use them at all. Unless you remove
the ThreadLocal safely after *every single request*, you will likely
have a ClassLoader leak which means that you won't be able to reliably
redeploy your webapp without restarting CHADIS. (That's why I asked
about redeployments, but you didn't answer).
> I dont have manager app , I just have my application I removed all
> others apps from tomcat.
Not terribly relevant.
- -chris
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Re: tomcat 6.0.35 in production maintaince
Posted by fachhoch <fa...@gmail.com>.
Hard to say exactly. Perhaps your session expiration time is large and
sessions are not being removed as quickly as you would expect.
how can I figure this out ?, I am did not make any setting for session
timeout ,except for browser activity where to check session expiration
configration?
are there any suggested ways to use threadlocal when deployed in tomcat ? I
am using thread local as advised in any tutorial, any special care must
be taken with threadlocal for tomcat ?
I dont have manager app , I just have my application I removed all others
apps from tomcat.
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Re: tomcat 6.0.35 in production maintaince
Posted by Daniel Mikusa <dm...@vmware.com>.
On Mar 13, 2013, at 11:30 AM, fachhoch wrote:
> Will connecting jconsole to my prod env will it cause any performance issues
> ?
Connecting with jconsole shouldn't cause any problems.
> I connected jconsole to my server running in training env. Not many user
> were using my app are when I connected.
>
> I looked at activeSession whihc is in
> Manager/myapp/localhost/attributes/activeSession
>
> The value was 95 , I am sure not 95 users are using my app , its only me
> and one more guy logged in also logs say the same. How come I have 95
> sessions ,
Hard to say exactly. Perhaps your session expiration time is large and sessions are not being removed as quickly as you would expect.
> I can list session Ids but I donot see anything more about that
> session , can I check the size of a session ? and objects in the session?
Do you have the Manager app installed? This is probably the easiest way to look at your sessions.
> memory tab shows me how much is available ? etc but any pattern of the
> graph whihc says I have memory problems?
Not exactly sure what you are asking here, but in general if you have a memory leak the graph will trend upwards. In other words, the amount of memory in use will increase over time.
Dan
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Re: tomcat 6.0.35 in production maintaince
Posted by fachhoch <fa...@gmail.com>.
Will connecting jconsole to my prod env will it cause any performance issues
?
I connected jconsole to my server running in training env. Not many user
were using my app are when I connected.
I looked at activeSession whihc is in
Manager/myapp/localhost/attributes/activeSession
The value was 95 , I am sure not 95 users are using my app , its only me
and one more guy logged in also logs say the same. How come I have 95
sessions , I can list session Ids but I donot see anything more about that
session , can I check the size of a session ? and objects in the session?
memory tab shows me how much is available ? etc but any pattern of the
graph whihc says I have memory problems?
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Re: tomcat 6.0.35 in production maintaince
Posted by Christopher Schultz <ch...@christopherschultz.net>.
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Fachhoch,
On 3/12/13 10:43 AM, fachhoch wrote:
> I am using tomcat 6.0.35 in production. I am running my web
> application on this , It uses spring, wicket, hibernate and lot
> of other technologies, problem is after one month of running my
> application I get out of memory error perm gen space could not
> serialize mybject... . I am using wicket framework which
> serializes lot of stuff in memory I think it is serializing lot of
> stuff and not enough memory is available to serialize .
>
> After restart the server is good for approx one month.
>
> How can I detect in advance that my app is using up all available
> memory ? I am not a server administrator or system admin, I am
> just a developer and right now managing my production servers. This
> out of memory perm gen space error could this be because of
> some memory leak ?
>
> can I run gc once in week on running tomcat should we do this for
> server good health , earlier our deployment team used to deploy
> this and we never had out f memory issue. is there any maintenance
> necessary for production servers if so what are those ?
Do you redeploy your webapp ever/often without restarting Tomcat? Or
will your app fail after ~1 month with a single deployment?
- -chris
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