code: private void addClasses(Class<?>[] classes, HashSet<Class<?>> result){
  		
  		if(isNull(classes) || classes.length==0)	
  			Error.globalClassesAbsent(configuredClass);
  		
  		for (Class<?> classe : classes)	result.add(classe);
  	}
docs: Adds to the result parameter all classes that aren't present in it
  @param classes classes to control
  @param result List to enrich