public void loadThings() {
      thingList = entityManager.createQuery("select t from UnversionedThing t").getResultList();
      thingSet = new HashSet<UnversionedThing>(thingList);

      thingMap = new HashMap<Long, UnversionedThing>();
      for (UnversionedThing thing : thingList) {
        thingMap.put(thing.getId(), thing);
      }

      thing = thingList.get(0);
    }
 public void createSomeThings() {
   UnversionedThing thing1 = new UnversionedThing();
   thing1.setName("thing one");
   entityManager.persist(thing1);
 }