code: public static void loadPropertiesFromConfiguration(AbstractConfiguration config) {
          if (instance == null) {
              instance = getConfigInstance();
          }
          if (instance instanceof AggregatedConfiguration) {
              ((AggregatedConfiguration) instance).addConfiguration(config);
          } else {
              Properties props = ConfigurationUtils.getProperties(config);
              ConfigurationUtils.loadProperties(props, instance);
          }        
      }
docs: Load properties from the specified configuration into system wide configuration