code: protected <T> Expression getEntityField(CriteriaQuery<T> query, String listId, Attribute attr) {
          return defaultGetEntityField(query, listId, attr);
      }
docs: This method retrieves the entity "field" that can be used as the LHS of a {@link Predicate}
  </p>
  This method is overridden in some extended {@link QueryCriteriaUtil} implementations
  
  @param query The {@link CriteriaQuery} that we're building
  @param listId The list id of the given {@link QueryCriteria}
  @return An {@link Expression} with the {@link Path} to the field represented by the {@link QueryCriteria#getListId()} value