private void exportParameters() {
    synchronized (exported_parameters) {
      if (!exported_parameters_dirty) {

        return;
      }

      exported_parameters_dirty = false;

      try {
        TreeMap<String, String> tm = new TreeMap<String, String>();

        Set<String> exported_keys = new HashSet<String>();

        for (String[] entry : exported_parameters.values()) {

          String key = entry[0];
          String value = entry[1];

          exported_keys.add(key);

          if (value != null) {

            tm.put(key, value);
          }
        }

        for (Map.Entry<String, String> entry : imported_parameters.entrySet()) {

          String key = entry.getKey();

          if (!exported_keys.contains(key)) {

            tm.put(key, entry.getValue());
          }
        }

        File parent_dir = new File(SystemProperties.getUserPath());

        File props = new File(parent_dir, "exported_params.properties");

        PrintWriter pw =
            new PrintWriter(new OutputStreamWriter(new FileOutputStream(props), "UTF-8"));

        try {
          for (Map.Entry<String, String> entry : tm.entrySet()) {

            pw.println(entry.getKey() + "=" + entry.getValue());
          }

        } finally {

          pw.close();
        }
      } catch (Throwable e) {

        e.printStackTrace();
      }
    }
  }
  protected void saveAuthCache() {
    try {
      this_mon.enter();

      HashMap map = new HashMap();

      Iterator it = auth_cache.values().iterator();

      while (it.hasNext()) {

        authCache value = (authCache) it.next();

        if (value.isPersistent()) {

          try {
            HashMap entry_map = new HashMap();

            entry_map.put("user", value.getAuth().getUserName().getBytes("UTF-8"));
            entry_map.put("pw", new String(value.getAuth().getPassword()).getBytes("UTF-8"));

            map.put(value.getKey(), entry_map);

          } catch (Throwable e) {

            Debug.printStackTrace(e);
          }
        }
      }

      COConfigurationManager.setParameter(CONFIG_PARAM, map);

    } finally {

      this_mon.exit();
    }
  }