if ( properties == null ) { configuration = getDefaultConfig(); } else { loadProperties( DEFAULT_PREFIX, properties, strategy ); }  int port = getPort();  if ( port < 1 || port > 0xFFFF ) { throw new ConfigurationException( "Invalid value:  " + IP_PORT_KEY + "=" + port ); }
this( getDefaultConfig(), LoadStrategy.LDAP );
    public NtpConfiguration(Map properties, int strategy)    {        if ( properties == null )        {            configuration = getDefaultConfig();        }        else        {            loadProperties( DEFAULT_PREFIX, properties, strategy );        }        int port = getPort();        if ( port < 1 || port > 0xFFFF )        {            throw new ConfigurationException( "Invalid value:  " + IP_PORT_KEY + "=" + port );        }    }