Forwarding URL with semicolon

Hi,

I'm having problems using mod_proxy to connect Apache to Tomcat, so that 
certain URL patterns are sent to Tomcat for processing.

These are the specifications within my Apache httpd.conf file (they are 
inside a VirtualHost)

       ProxyRequests On
       ProxyPass /my/app http://192.168.1.102:8080/my/app
       ProxyPassReverse /my/app http://192.168.1.102:8080/my/app

The web application, running on Tomcat and built using Tapestry, is 
generating URLs that look like this:
/my/app;jsessionid=DE3B35431CCEB6ACE0D398A198A8870C

These URLs are NOT getting forwarded by Apache - instead, I am getting 
error messages like this:

Not Found
The requested URL /my/app;jsessionid=DE3B35431CCEB6ACE0D398A198A8870C was 
not found on this server.

And the Apache error_log shows:
[Wed Oct 29 10:58:36 2003] [error] [client 127.0.0.1] File does not exist: 
/apache/htdocs/my/app;jsessionid=de3b35431cceb6ace0d398a198a8870c

which shows that the URL is NOT being forwarded by mod_proxy, but Apache is 
instead trying to load it like it was a file.

Anybody have an idea how to resolve this?

Thanks,
-- Darren