LOG.error(eS.getMessage());
ErrorLog.error(Group.class, E.GROUP_SCHEMA + eS.getMessage());
  private Set getGroup_types() {    // We only want to return the singleton instances of each group    // type.  This saves from potential catastrophe when saving objects    // as well as (hopefully) being more efficient.    if (this.types == null) {      types         = new LinkedHashSet();      Iterator iter = this.group_types.iterator();      while (iter.hasNext()) {        try {          GroupType type = (GroupType) iter.next();          types.add( GroupTypeFinder.find( type.toString() ) );        }        catch (SchemaException eS) {          LOG.error(eS.getMessage()); // TODO        }      }    }    return this.types;  }