docs: @JsonIgnore
      protected Map<String, List<Object>> getCachedPrincipalAttributes(final Principal principal, final RegisteredService registeredService) {
          try {
              val cache = getCacheInstanceFromApplicationContext();
              return cache.getCachedAttributesFor(registeredService, this, principal);
          } catch (final Exception e) {
              LOGGER.error(e.getMessage(), e);
          }
          return new HashMap<>(0);
      }