I consulted the Internet. I have 50 bazillion pages on Tomcat configuration bookmarked now. Nothing helped.
I was way too late to catch the bus home from work last night, so I decided to walk. On a whim, I went into Borders and wandered over to The Tomcat Bible. The answer, the table of contents suggested, was on page 288. Lo and behold--it was there! Staring me in the face from page 288, in plain old black and white.
I implemented the solution this morning. It worked like magic, but I'm still irate: The answer was in a book. Why do I have to use medieval technology to solve 3rd-Millennium problems?
Internet, I am seriously considering defriendstering you for this.