How do I generate WADL from RESTful Java code?

I have a simple RESTful service in IntelliJ IDEA 12.1.3 Ultimate.

I've tested it.  It works.  Now I want to create a Java client for this service and need a WADL.

Per the instructions at http://wiki.jetbrains.net/intellij/RESTful_WebService , I right clicked my class and went to "Web Services -> RESTful Web Services" only to find the menuitem "Generate WADL from Java Code" disabled.

What have I done wrong?

Here's the code:

package com.mybiz;

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;

@Path("/greeting")
public class Greeter {
    @GET
    @Produces("text/plain")
    public String hello() {
        return "Hi!";
    }
}