Hi anupa,
Build.xml is not necessory for deploying web apps in Jboss.
It only makes your life easy by doing a lot of tasks (compilation,war creation, file copying ect..) for you.
If you want to learn both ant and Jboss fundamentals from a single tutorial,
this is a good place to start with.
Just google the web, you can get lots of Jboss tutorials.
Shahabas E Shabeer
[ June 15, 2005: Message edited by: shahabas shabeer ]