code: @Override
      public Set<String> getJcrRepositoryNames() {
          try {
              return ((ModeshapeRepositoryFactory) repositoryFactory).getRepositoryNames();
          } catch (RepositoryException e) {
              LOGGER.error(WebJcrI18n.cannotLoadRepositoryNames.text(), e);
              return Collections.emptySet();
          }
      }
docs: Returns a set with all the names of the available repositories.
  
  @return a set with the names, never {@code null}