When I first starting working on a BlazeDS application, it wasn't too difficult to build the example flex application using FlexBuilder, then deploy on JBoss. However, once I started attempting to build using Ant, I started to run into some problems. Using a seemingly correct build script resulted in a non-functioning flex build (it is pretty easy to tell, since you can see in the lower status bar of your browser that there isn't any communication with the server).