static Properties getAuIdProperties(String location) {
   File propFile = new File(location + File.separator + AU_ID_FILE);
   try {
     InputStream is = new BufferedInputStream(new FileInputStream(propFile));
     Properties idProps = new Properties();
     idProps.load(is);
     is.close();
     return idProps;
   } catch (Exception e) {
     logger.warning("Error loading au id from " + propFile.getPath() + ".");
     return null;
   }
 }