How to run jsp page

[nikisonproblem]

I am using eclipse europa

and jsf 1.2 i have just added one jsp page and i want to run this page
but i am getting http 404 error when i run this page

how to run it ?i have to make any changes in web.xml?

[Ed]

Did you copy your project in TOMCAT/WEBAPPS?
I send you an example
If you have your project in the path
C:\Apache Software Foundation\Tomcat 5.0\webapps\ROOT\samples
and your page is named "helloworld.jsp"
call the jsp like that
http: //localhost:8080/root/helloworld.jsp