How to schedule events on Tomcat?

[Brian]

Hi,
 
I have a regular app in my Tomcat server, based on the request/response 
paradigm. 
 
I need some processes tu run at some specific intervals, lets say after 30 
minutes of some events, or maybe every 30 minutes. Is there a way to do that on 
Tomcat, to schedule events?
 
I don't want to try tying this process to the requests, because it would make 
them run slower, and it would run twice at the same time if two requests arrive 
almous simultaneously.
 
 
 
Thanks,
 
 
 
Brian