Invoking servlet from server (tomcat 5.5) at regular interval

Hi all
My problem is I want to send mail on 1st day of every month through form my application. But for that I don’t want to login my application. It should fire automatically from server. I am using Tomcat 5.5 for my application. This process also involved talking to database.
Is there any to achieve this?
Please help me.

Thanks in advance.