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.
You need to select war packaging, when setting the maven configuration (or If your project is already created, change the packaging to war).
Eclipse WTP doesn't use the same defaults as Maven (or m2eclipse for that matter). You should configure warSourceDirectory in the maven-war-plugin, so it points to WebContent (http://maven.apache.org/plugins/maven-war-plugin/war-mojo.html)
In any case you will need to right-click on your project, Maven > Update Project configuration.