private Class<?> resolveReturnType(Method me) {
    Type returnType = me.getGenericReturnType();

    if (returnType instanceof ParameterizedType) {
      ParameterizedType type = (ParameterizedType) returnType;
      Type[] typeArguments = type.getActualTypeArguments();
      for (Type typeArgument : typeArguments) {
        if (typeArgument instanceof Class<?>) {
          return (Class<?>) typeArgument;
        }
      }
      return null;
    }
    return (Class<?>) returnType;
  }