code: public Map<String, List<String>> getPropertyMessageMap() {
          return messages.map(er -> {
              return requestManager.getMessageManager().toPropertyMessageMap(requestManager.getUserLocale(), er);
          }).orElse(Collections.emptyMap());
      }
docs: Get the map (property : list of message text) of message for the errors by user locale. <br>
  Basically these are embedded in exception.
  @return The map of message, resolved by resource. (NotNull, EmptyAllowed)