I have JSP site and page names are in query param with name "page". I want for
page name to have this value. So it would be something like this:

%h%p/%[page].%t

But my problem is if there is no page query param, or if it is a file, then I
end up with something like this:

../localhost_8080/my_site/.html

same goes for pdfs and other files.

How can i put page name in advanced param settings, so if there is no param
defined it shoud use page name? I tried this (it shoud look something like
this):

%h%p/%[page::::%n].%t

but it does not work, it just put %n string before extension of file. How can 
I solve this problem.

Thanks in advance! (sorry for bad English)