code: @Override
      public String getGroupDisplayName(String groupSecurityName) throws EntryNotFoundException, RegistryException {
          if (groupSecurityName == null) {
              throw new IllegalArgumentException("groupSecurityName is null");
          }
          if (groupSecurityName.isEmpty()) {
              throw new IllegalArgumentException("groupSecurityName is an empty String");
          }
  
          if (!isValidGroup(groupSecurityName)) {
              throw new EntryNotFoundException(groupSecurityName + " does not exist");
          }
          return groupSecurityName;
      }
docs: {@inheritDoc}