Does exact match has priority over extension mapping?

Question

Hi, i'm using extension mapping in my web application. So one
servlet is responsible for all requests with extension 'do'.
Now i would like to have one special request served by another
servlet. What's the best way to implement this? I'm thinking
about setting up an exact match mapping for the special request
and an extension mapping for the rest. There's only one thing
i worry about: if i use the 'do' extension in my special request
(for consistency reasons), which servlet will handle this request?
Thanks in advance for your comments.
Markus

Answer 1

A exact match on path will override the extension mappng. Here's the rules from the servlet 2.3 spec (also contains examples)..
1. The container will try to find an exact match of the path of the request to the
path of the servlet. A successful match selects the servlet.
2. The container will recursively try to match the longest path-prefix: This is done
by stepping down the path tree a directory at a time, using the �/� character as
a path separator. The longest match determines the servlet selected.
3. If the last segment in the URL path contains an extension (e.g. .jsp), the servlet
container will try to match a servlet that handles requests for the extension.
An extension is defined as the part of the last segment after the last �.� character.
4. If neither of the previous three rules result in a servlet match, the container will
attempt to serve content appropriate for the resource requested. If a "default"
servlet is defined for the application, it will be used.
The container must use case-sensitive string comparisons for matching.