code: public static String readEnvironment(String environmentName) throws MnoConfigurationException {
  		String property = System.getenv(environmentName);
  		if (isNullOrEmpty(property)) {
  			throw new MnoConfigurationException("Could not environment variable: " + environmentName);
  		}
  		return property;
  	}
docs: Return the value from the properties, and if not found try to find in the System environment variable, if not found throws a MnoConfigurationException