private void loadUserDefinedGroups() {
   FileObject input = FileUtil.toFileObject(new File(WEBSVC_HOME, SERVICE_GROUP_XML));
   try {
     if (input != null) {
       rootGroup = SaasUtil.loadSaasGroup(input);
     }
   } catch (Exception e) {
     Exceptions.printStackTrace(e);
   }
   if (rootGroup == null) {
     Group g = new Group();
     g.setName(ROOT_GROUP);
     rootGroup = new SaasGroup((SaasGroup) null, g);
   }
 }