public static ConfigAccessor loadExternalProperties(final String... externalPropertiesFilenames) {
   final Properties properties = new Properties();
   for (int i = 0; i < externalPropertiesFilenames.length; ++i) {
     String currentPropertyFilename = externalPropertiesFilenames[i];
     PropertiesLoader.loadExternalPropertiesFile(properties, currentPropertyFilename);
   }
   final PropertiesConfigAccessor config = new PropertiesConfigAccessor(properties);
   return config;
 }