title: Intellij complains about must either be declared abstract or implement abstract method '$init$()' in 'Plugin'
body: <p>I'm trying to create a custom plugin in Play Framework 2.1.1 in Java, but my IntellJ is complaining that I must implement the $init$ method (scala trail def)</p>
  
  <p><img src="https://i.stack.imgur.com/CWehk.png" alt="enter image description here"></p>
  
  <p>The plugin works (for what is actually does at this stage), but the red compiler error seems wrong.</p>