ProxyPass entire domain to Tomcat, including root

I have configured my VirtualHost example.com to proxy all requests to a Tomcat server

ProxyPass / http://localhost:8088/app
ProxyPassReverse / http://localhost:8088/app

This works fine for URLs like example.com/page, but for example.com and example.com/ I get this redirection response, which obviously leads to nothing.

HTTP/1.1 302 Moved Temporarily
Date: Wed, 06 Jul 2011 21:13:37 GMT
Server: Apache-Coyote/1.1             <-- the redirect comes from tomcat
Location: http://example.com/app/     <-- nonsense
...

What can I do to fix it? Preferably in the Apache config.

I'm using Apache 2 and Tomcat 7

I'm not exactly sure why, but this is the fix

ProxyPass / http://localhost:8088/app/
ProxyPassReverse / http://localhost:8088/app/

(Added slashes to the end)