Where should I validate my attributes?

[carlos.grahl]

Hi, all!

I'm new to Jboss and Patterns. I was reading the 'Core J2EE patterns' book (great book!), and I have a question:

Where should I put my attributes validation (like InvoiceDate > today, etc..)...?

I can put it in the presentation level (on the validate() function of struts, for example). But I need to put it on the server-level. I don´t know where.. Maybe on facade, on a session bean, etc..

Where?

Anyone can help me, please?

TIA

Carlos Augusto Grahl

[crackers]

It's probably better to put validation in with your "business logic" rather than with whatever you're using to persist the data -- makes it easier to change the business rules for validation.