What is the significance of this warning message in mod_jk.log and how do we stop it?

We have the following [warn] message logged in the Apachee Tomcat mod_jk.log file every few 100ths of a second.

[Mon Apr 13 09:59:27 2009] [warn]  map_uri_to_worker::jk_uri_worker_map.c (429): Uri * is invalid. Uri must start with /

What does this signify and how might we stop if from being logged?

We are running RHEL 5.2  Apache 2.2.11  Tomcat 5.5.27  jkconnector 1.2.27