Can we run a servlet application on mobile?

Hi,
I'm new to servlets and mobile web as well.
I want to design an application which user can access through mobile and as well as dekstop.
1.) Can we access a web application designed through servlets and JSP via mobile device (e.g, PDA and mobile handphone)?
2.) Do we require to create two "copies" of an application, one for computer based and one for mobile device based?
3) Do we follow some other architecture to design for a mobile enabled web site?
Please share some examples or papers.
Thanks in Advance

Servlet and other stuff were developed for a purpose of viewing web pages on any devices etc. Problem with javascript for example is that it is client-runnable. On the other hand, servlets and JSP run on a server. Users (clients) only get a HTML and nothing more (ok maybe XML and other formats), but they don't run code.
That means that you can view a web app on any device that supports HTML. Of course formating can be set for each device (PC, PDA, mobile, etc).
"U want to say that we can access an web application developed using JSP and servlets for the use of dekstops on Mobile or PDA also.": YES
"Or we have to do the WAP programming for the same.": WAP programming is dead for a few years now :)

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