code: private String reloadConfiguration() {
          String location = System.getProperty(APPLICATION_CONFIGURATION);
          if (location == null) {
              location = "conf/application.conf";
          }
  
          Config configuration = loadConfiguration(location);
  
          if (configuration == null) {
              throw new IllegalStateException("Cannot load the application configuration (" + location + ") - Wisdom cannot " +
                      "work properly without such configuration");
          }
  
          setConfiguration(configuration);
  
          return location;
      }
docs: Reloads the configuration file.
  
  @return the location of the file.