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Message-ID: <515C47E5.5030705@christopherschultz.net>
Date: Wed, 03 Apr 2013 11:16:53 -0400
From: Christopher Schultz <chris@christopherschultz.net>
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To: Tomcat Users List <users@tomcat.apache.org>
Subject: Re: how to monitor the traffic through the connector
References: <kit7lh$d9j$2@ger.gmane.org>
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 <B6AA1A86-4BD7-4D20-8272-2398B3C2DA8C@vmware.com>
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Jeffrey,

On 4/1/13 3:52 PM, Jeffrey Janner wrote:
>> -----Original Message----- From: Daniel Mikusa
>> [mailto:dmikusa@vmware.com] Sent: Monday, April 01, 2013 1:09 PM 
>> To: Tomcat Users List Subject: Re: how to monitor the traffic
>> through the connector
>> 
>> On Apr 1, 2013, at 1:40 PM, a wrote:
>> 
>>> Hi,
>>> 
>>> Thank you for reply. The servlet of the web application does
>>> not response to the request after running serveral months. The
>>> problem can be solved by
>> restarting the tomcat.
>>> I want to troubleshoot by monitoring the number of avaliable
>>> threads or occupied threads.
>>> 
>>> Thank you
>>> 
>> 
>> First, don't top post (i.e. reply at the top of your email).
>> Either reply below the previous response or as typically works
>> best, inline.
>> 
>> Second, when you encounter a problem with your servlet / Tomcat,
>> take three or four thread dump, separated by 15 - 20 seconds
>> each.  Each thread dump will show you the current status of all
>> the threads in the JVM.  You can use the thread dumps to check
>> for block threads and long running processes.
>> 
>> Instructions for taking a thread dump.
>> 
>> 
>> https://wiki.apache.org/tomcat/HowTo#How_do_I_obtain_a_thread_dump_of_m
>>
>> 
y_running_webapp_.3F
>> 
>> Dan
>> 
> 
> FWIW, I've found jconsole immensely helpful in sorting out blocked
> threads. And none of that manually searching through dumps.

Jconsole is notoriously difficult to get running on a remote server
(unless it's running Microsoft Windows, but then again I can't imagine
a Windows server that stays running for "several months" where the
webapp turns out to be the problem ;).

- -chris
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