/** Constructor to initialize filter-names with RoleFilter-Class. */
 public HibernateUserAccountDao() {
   try {
     final UserAccountFilter userAccountFilter = new UserAccountFilter(null);
     final RoleGrantFilter roleGrantFilter = new RoleGrantFilter(null);
     this.criteriaMap = userAccountFilter.getCriteriaMap();
     this.propertiesNamesMap = userAccountFilter.getPropertyMap();
     this.grantPropertiesNamesMap = roleGrantFilter.getPropertyMap();
   } catch (final InvalidSearchQueryException e) {
     // Dont do anything because null-query is given
     if (LOGGER.isWarnEnabled()) {
       LOGGER.warn("Exception for null-query");
     }
     if (LOGGER.isDebugEnabled()) {
       LOGGER.debug("Exception for null-query", e);
     }
   }
 }