Dropwizard and similar micro-frameworks are getting more popular. It's been several years since I ran a Java web application on an application server, and that was an application I was tasked with decommissioning.

In case you're not familiar with it, Dropwizard is a collection of libraries packaged up with some conventions and glue; it uses Jetty to serve HTTP and also integrates Jersey and Jackson (RESTful routing and JSON encoding) so that you don't have to do it yourself.