Should i validate parameters in constructor?

Question

I am creating a web application following the MVC pattern.

In effective Java the author mentions to validate the parameters in the constructor of the class when creatin

Answer 1

I would suggest validating the data in your domain and returning a (custom) exception when fields aren't filled in correctly. This way you'll be able to implement a different UI without having to do the entire validating process again, it's best to separate this as much as possible.