code: private String getMandatory(String name) {
  		if (!config.containsKey(name)) {
  			throw new RuntimeException(name + " parameter is missing.");
  		}
  		else {
  			return config.getString(name);
  		}
  
  	}
docs: Enforce the fact that a parameter is mandatory
  @param name The name of the parameter
  @return The value found
  @throws RuntimeException When a mandatory parameter is missing