docs: protected static void readConfiguration(){
  		PropertiesLoader propLoader = new PropertiesLoader(ConnectionUtility.class);
  		try {
  			configuration = propLoader.load(ROOT_CONFIGURATION_FILE);
  		} catch (Exception e) {
  			log.error("Error when loading configuration from properties file", e);
  		}
  		if (configuration == null){
  			log.error("Configuration properties file not found.");
  		}
  		log.debug("Combined configuration is:\n" + MapLister.listToString(configuration));
  	}