Commons Logging Issues

We are having problems deploying JIRA in the latest versions of Tomcat 
due to commons logging hell.  It seems that Tomcat packages 
commons-logging in servlet/lib/ which clashes if you package your own 
version.

Of course I need to package my own version of commons-logging because if 
I deploy on any other server I need it.

Here is a good article about it:

   http://www.qos.ch/logging/thinkAgain.html

Our specific problem is here:

   http://marc.theaimsgroup.com/?l=tomcat-dev&m=103481398706987&w=2

Now, my question is - do we actually benefit from using commons-logging 
instead of log4j?  What were the reasons for it?  Are they still valid?

Cheers,
Scott
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