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From Rainer Jung <>
Subject Re: tomcat mod_jk error log
Date Mon, 19 Nov 2007 09:18:27 GMT
Hi Martin,

lanes wrote:
> Hi Rainer,
> my os is Red Hat Linux v7.3 2.96-112.
> this my =

Delete the next 3 lines, they are useless.

> workers.tomcat_home=/usr/local/tomcat
> workers.java_home=/usr/java/j2sdk1.4.1_02
> ps=/

I hope you are not really trying to do ajp12?
If you are only using ajp13, then delete ajp12 from the worker list and 
all lines of the form worker.ajp12....=... from the file.

> worker.list=ajp12, ajp13
> worker.ajp12.port=8007
> worker.ajp12.type=ajp12
> worker.ajp12.lbfactor=1
> worker.ajp13.port=8009
> worker.ajp13.type=ajp13
> worker.ajp13.lbfactor=1

Read the docs about the more up-to-date names of the directives 
cachesize and cache_timeout (the page on containes a 
list of deprecated attributes and their replacements).

> worker.ajp13.cachesize=10
> worker.ajp13.cache_timeout=600
> worker.ajp13.socket_keepalive=1 
> worker.ajp13.socket_timeout=300
> worker.ajp13.reply_timeout=60000 
> worker.loadbalancer.type=lb

It doesn't really make sense to balance between an ajp12 and an ajp13 
worker (it should work, but I see no real reason for it).

> worker.loadbalancer.balanced_workers=ajp12, ajp13

Delete all the worker.inprocess, I hope you are not really trying to use 

> worker.inprocess.type=jni
> worker.inprocess.class_path=$(workers.tomcat_home)$(ps)lib$(ps)tomcat.jar
> worker.inprocess.cmd_line=start
> worker.inprocess.jvm_lib=$(workers.java_home)$(ps)jre$(ps)bin$(ps)classic$(ps)jvm.dll
> worker.inprocess.stdout=$(workers.tomcat_home)$(ps)logs$(ps)inprocess.stdout
> worker.inprocess.stderr=$(workers.tomcat_home)$(ps)logs$(ps)inprocess.stderr

Which version of mod_jk? Modern version will log an info message during 
startup, for older ones you can do

strings modules/ | fgrep 1.2.

Version 1.2.25 is the most recent (and recommended).

> below is my apache conf file to load mod_jk =
> LoadModule    jk_module  modules/
> JkWorkersFile /usr/local/tomcat/conf/
> JkLogFile     /etc/httpd/logs/mod_jk.log
> JkLogLevel    info

Better use the default JkLogStampFormat, then you will profit from 
improvements there (e.g. since version 1.2.25 we log milliseconds by 
default, unless you are using an old hard-coded JkLogStampFormat).

> JkLogStampFormat "[%a %b %d %H:%M:%S %Y] "
> Alias /testPortal /usr/local/tomcat/webapps/testPortal
> JkMount /*.jsp ajp13
> JkMount /*/servlet/ ajp13

OK, so you are not usiung ajp12 and inprocess workers (good) and you can 
delete the respective config items in

Since you don't use the loadbalancer either, you can also delete those 
lines (or instead replace "ajp13" in the JkMount by "loadbalancer").

> My tomcat version is 4.1.12

Oops, that's very outdated, and maybe here's the reason for the error 
messages. It could very well be, that Cping/Cpong were invented after 
4.1.12, so the Tomcat connector might not know about this protocol. If 
you need to stick to 4.1, that version is still well maintaoined. Please 
update to 4.1.36 and try again.

> Thank you very much.
> Regards,
> Martin



> Rainer Jung-3 wrote:
>> Hi,
>> we can't identify your problem without knowing your configuration.
>> Please give us
>> - your operating system
>> - your Tomcat connector configuration for the connector you talk to via
>> mod_jk
>> - your
>> - your httpd JK-directives
>> - your Tomcat-version and mod_jk-version
>> You can furthermore improve the chance of finding your problem by
>> running your test case when having "JkLogLevel debug" and posting
>> the full jk log file in addition.
>> I would guess, the problem could have to do with a firewall dropping
>> idle connections between Apache and Tomcat? If so, look at the Timeouts
>> documentation page of mod_jk.
>> Regards,
>> Rainer
>> Marthen LT schrieb:
>>> hi all,
>>> i have a live production server running tomcat & apache under linux.
>>> but recently my cpu usage is being consumed by the mod_jk log file.
>>> it keep logging and saying below warning/error messages:
>>> [Fri Nov 16 15:02:13 2007]  [jk_ajp_common.c (819)]: ERROR: can't
>>> receive the response message from tomcat, network problems or tomcat
>>> is down. err=-1
>>> [Fri Nov 16 15:02:13 2007]  [jk_ajp_common.c (717)]: Error
>>> ajp13:cping: awaited reply cpong, not received
>>> [Fri Nov 16 15:02:13 2007]  [jk_ajp_common.c (1026)]: Error sending
>>> request try another pooled connection
>>> what is happening?
>>> i try to restart my tomcat also didn't give me a solution.
>>> any help will be appreciated.
>>> thank you.

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