How can I automatically invoke a servlet at regular time intervals using Resin?

You can configure Resin to run servlets at regular intervals.

In /ref/servlet-config.xtp in the Resin docs, have a look at the run-at specification for resin.conf.

I think that if you want every five minutes you need to use:

<run-at>:00 :05 :10 :15 :20 :25 :30 :35 :40 :45 :50 :55</run-at>