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From Ceki Gülcü <>
Subject Re: jcl blog post
Date Fri, 18 Feb 2005 14:18:48 GMT


The defects can be reproduced easily.

Assuming you deployed your application on Tomcat, the combination known to 
work safely is:

1) Leave the file TOMCAT_HOME/bin/commons-logging-api.jar as is.
2) Place the files commons-logging.jar and log4j.jar in the directory 
3) Do not include any other copies of commons-logging.jar and log4j.jar in 
your web-applications' WEB-INF/lib/ directory.
4) Do not set the org.apache.commons.logging.LogFactory property.

Was your deployment combination different from the above?

At 02:54 PM 2/18/2005, Vic wrote:
>I used to use both together. For what ever reason, I have stress tested 
>and put in production several systems, one with 10,000 concurrent users, 
>one w/ 40,000 concurrent users... and everything seems to be working. I 
>was not aware of any bugs.
>Now .... I use WebStart so likely at least a part will be JDK logging.
>Ceki Gülcü wrote:
>>   a problem with JCL, a totally defective piece of
>>software, which makes life very difficult, if not impossible, for
>>log4j users.

Ceki Gülcü

   The complete log4j manual:

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