code: @Override
      public boolean canHandleClass(Class<?> clazz) {
          if (listHandledClasses == null) {
              return true;
          } else {
              return listHandledClasses.contains(clazz);
          }
      }
docs: Wether or not this bus element can persist/unpersist objects of the given
  class clazz.
  @param clazz
  the class of objets we are looking forward to persist.
  @return true if this bus element can persist/unpersist objects of the
  given class clazz. False otherwise.