private static List<Class> findClasses(File directory, String packageName) throws ClassNotFoundException {
	   List<Class> classes = new ArrayList<Class>();
	   if (!directory.exists()) {
		   return classes;
	   }
	   File[] files = directory.listFiles();
	   for (File file : files) {
		   if (file.isDirectory()) {
			   assert !file.getName().contains(".");
			   classes.addAll(findClasses(file, packageName + "." + file.getName()));
		   } else if (file.getName().endsWith(".class")) {
			   classes.add(Class.forName(packageName + '.' + file.getName().substring(0, file.getName().length() - 6)));
		   }
	   }
	   return classes;
   }