Tomcat 404 - how to log bad url?

[M Conlin]

I want to capture the bad URL when a 404 is thrown.

The only way I do this so far is to have the tomcat log4j.properties set to DEBUG, this creates a HUGE amount of logging.

Are there any other ways to get this information... when the URL is bad I want to see what it was they wanted.

[Ben Souther]

If you turn on access logging (uncomment its entry in server.xml) you'll have a typical log that can be parsed with programs like webalizer.
This has log entries for every hit, including the response code.