title: Nested Java hashmap to nested Scala map conversion
body: <p>What is the right way to convert a variable of type <code>java.util.HashMap&lt;java.lang.String, java.util.List&lt;java.lang.String&gt;&gt;</code> in Java, to its Scala equivalent: <code>Map[Map[String, List[String]]]</code>? (with Scala <code>Map</code>, <code>String</code> and <code>List</code>)</p>
  
  <p>I tried to use <code>import scala.collection.JavaConverters._</code> and do <code>JavaNestedMap.asScala</code> but it failed. Is there a smart way of doing this (rather than having two <code>map</code>s)? </p>