title: Convert Java Map to Scala Map
body: <p>I have a java map: <code>java.util.Map&lt;SomeObject, java.util.Collection&lt;OtherObject&gt;&gt;</code>
  and I would like to convert it to the scala map: <code>Map[SomeObject, Set[OtherObject]]</code></p>
  
  <p>I have used <strong>mapAsScalaMap</strong> but the result is not quite what I want, the result is: <code>Map[SomeObject, java.util.Collection[OtherObject]]</code>. How can I fix it to also convert the collection to a set?</p>
  
  <p>NOTE: actually my original problem was to convert google's <code>ArrayListMultimap&lt;SomeObject, OtherObject&gt;</code> to a <code>MultiMap[SomeObject, OtherObject]</code> but since this was not possible I've split the problem. If you have a solution for the original problem, I'll also accept it as the answer.</p>