Wrong page appearing - problem with WEB.XML?

[jon yeargers]

I enter a URL (EG http://server:8080/someServlet?param=value) but
instead of getting the servlet I get the 'default' or 'welcome' page
from the same site. The servlet in question doesn't have anything to do
with the page that is appearing. The servlet does work - why wouldn't it
appear when called? (sounds like my dog)