Java EE (Java Enterprise Edition) General Discussion

Hello here :)
This is my first time posting, I guess...

Anyhow, the scenario is:
My web is using Apache Tomcat, MySQL as the database.
The web's content is dynamic, let's say the product is addedd dynamicallly and ocassionally.
Each product has its own dynamic generated page generated by JSP (for example: products.jsp?id=12)

It will be pain that I need to re-hardcode my robots.txt everytime I register a new product in my site.
So, I need a dynamic robots.txt generated by JSP if possible.
Printing out the robotstxt content is no prob, but how to make that request to url robots.txt is handled by JSP?

What is a good approach to do this?

Thanks