code: public static String qualifyId(final Class<?> entityClass, final Object id) {
      return qualifyId(entityClass.getName(), id);
    }
docs: Qualify and ID to construct and unique ID. Given: model.Beer and "ipa" this method returns:
  <code>model.Beer::ipa</code>.
  
  @param entityClass Entity class.
  @param id Entity id.
  @return Qualified ID.