j_security_check and changing users/passwords

I've got my login page working perfectly, but I want to be able to have users change their passwords.

I've tried changing the conf/tomcat-users.xml file directly, but it seems that the user file must be loaded once when Tomcat is started, since any changes after that have no effect (eg. I delete a user from the xml file, but can still login).

How can I add/edit/remove users while leaving the Tomcat server running?

[438 byte] By [torfua] at [2007-11-27 7:27:36]