code: public void setSortKey(final String _sortKey)
      {
          setSortKeyInternal(_sortKey);
          try {
              Context.getThreadContext().setUserAttribute(getCacheKey(UITable.UserCacheKey.SORTKEY),
                              _sortKey);
          } catch (final EFapsException e) {
              // we don't throw an error because this are only Usersettings
              AbstractUIHeaderObject.LOG.error("error during the retrieve of UserAttributes", e);
          }
      }
docs: Setter method for instance variable {@link #sortKey}.
  
  @param _sortKey value for instance variable {@link #sortKey}