While I've been happily developing using Jetty for the past three months
(~ish), today I needed to try out running the app in Tomcat to figure out
whether a specific bug was caused by Jetty (has to do with removable drive
access). So, I installed the Maven Tomcat plugin as instructed by the FAQ
(http://appfuse.org/display/APF/FAQ#FAQ-notomcatinstall), and did the mvn
tomcat:run command.

However, now it's giving me the following error:

Invalid class loader hierarchy. You hae more than one version of
'org.apache.commons.logging.Log' visible, which is not allowed.

I've read around about the topic, but there doesn't seem to be a simple
solution of editing a config file (or I've lost the ability to read - it's
getting late around here).

So, inform me: How do I get rid of this error, preferably without having to
switch logger (i.e. edit loads of source code)?
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