Java EE (Java Enterprise Edition) General Discussion

Hello everyone.

I couldn't find it via google so maybe you can help me.

I'm looking for Form or Action error handling.

I'm mean that i want to check if data posted via a FORM are correct.

How can I valiate data sent from a a form without methods being deprecated?

I want to write every error in different places on the page
(under every field)

Please give me any links, function names, library name, etc.

Thanks!