title: sorting a hashmap by value in xtend
body: <p>Suppose I have a java.util.HashMap object.  I want to produce a List in which the entries in the HashMap are sorted high to low by the value of the Double.  How do I do it?  I've made a stab at it in Java using the Guava Ordering class, but I don't like the aesthetics of jumping from xtend to Java and, besides, it isn't working :(  I have the sense that this should be easy in xtend using lambda expressions, but I can't figure out how to do it.</p>
  
  <p>Thanks.</p>