private static Organisation getOrganisationByGroupName(String groupName) throws Exception {
   List<Organisation> allOrgs =
       tbclient.getOrganisationClient().get(new URL(ORGANISATION_SERVICE_ROOT));
   for (Organisation org : allOrgs) {
     if (groupName.equals(org.getGroupName())) {
       return org;
     }
   }
   return null;
 }