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Will validators duplicate business logic?

I know that you can use validators to check data input at the presentation level of the application (for example, regular expression, required fields, etc.), and also to display a message and / or the desired marker icon. Data validation usually belongs to the business layer. How do I avoid supporting two sets of validations for the data that I collect?

EDIT: I know that ad validation is good and that it informs the user and that it is not infallible. The fact remains, is it not that I am testing the same thing in two places?

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4 answers

Yes and no.

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http://highoncoding.com/Articles/424_Creating_a_Domain_Object_Validation_Framework.aspx

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Source: https://habr.com/ru/post/1711269/

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