config = new NullConfiguration();
config = new GnuConfiguration();
  static Configuration getConfig()  {    if (config == null)      {        String conf = (String) AccessController.doPrivileged          (new PrivilegedAction()            {              public Object run()              {                return Security.getProperty ("login.configuration.provider");              }            });        try          {            if (conf != null)              config = (Configuration) Class.forName (conf).newInstance();            else              config = new NullConfiguration();          }        catch (Exception x)          {            config = new NullConfiguration();          }      }    return config;  }