code: @Override
      public Object getObjectInstance(Object o, Name n, Context c, Hashtable<?, ?> envmt) throws Exception {
          @SuppressWarnings("unchecked")
          Hashtable<String, Object> env = (Hashtable<String, Object>) envmt;
          return (o instanceof Reference) ? resolve((Reference) o, env) : null;
      }
docs: ///////////////////////////////