Hi. You have to update jboss-service.xml located into deploy/jbossweb.sar/META-INF with something like this:
I put that block inside of declaration of attribute "ConfigurationElement"
Than when you create you own webroot directory dont forget to create WEB-INF dir inside of it and put some simple web.xml into WEB-INF
You can access all you static web resources from directory webroot or what ever you named it
For example: if I put index.html into webroot dir
url looks like this http://localhost:8080/index.html