code: private static Properties getPropertiesFile() {
          try {
  
              // We use the class loader to load the properties file.
              // This compatible with unix and windows.
              final InputStream stream = TangoFactory.class.getClassLoader().getResourceAsStream(
                      FACTORY_PROPERTIES);
              final Properties properties = new Properties();
  
              // We read the data in the properties file.
              if (stream != null) {
                  // We need to use a Buffered Input Stream to load the datas
                  final BufferedInputStream bufStream = new BufferedInputStream(stream);
                  properties.clear();
                  properties.load(bufStream);
              }
              return properties;
          } catch (final Exception e) {
              e.printStackTrace();
              return null;
          }
      }
docs: We get the properties file which contains default properties
  
  @return Properties