This week's book giveaway is in the Mac OS forum. We're giving away four copies of a choice of "Take Control of Upgrading to Yosemite" or "Take Control of Automating Your Mac" and have Joe Kissell on-line! See this thread for details.
In the war task you specify the deployment descriptor (web.xml) with an attribute. Also including it as part of the fileset generates the warning. To prevent the warning, exclude the web.xml from the fileset.