[Springframework-developer] Declarative Validation Framework in Spring's Future?

[Matt R. <li...@ra...>]

Hey guys,

I have the following section in one of my Spring Live chapters.  I=20
haven't seen much activity on the "declarative validation" front in=20
Spring MVC - so I want to make sure this is still valid.

Thanks,

Matt

Spring=92s Future Declarative Validation Framework
At the time of this writing, Commons Validator is the only declarative=20=

validation framework that's been released to support Spring MVC. There=20=

is another declarative validator (the Valang Validator) that's part of=20=

the Spring Modules project, but it hasn't been released yet.  As far as=20=

declarative validation being part of Spring - there are plans for it,=20
but it hasn't been developed yet. I asked Keith Donald to provide me=20
with a few details about it, and here are the key=20
features/differentiators he sent me:
=95	A simple, consistent interface for defining new validation rules=20=

(rule providers simply implement a single "boolean test(argument)"=20
method).
=95	Support for bean property expressions (for example, minProperty =
must=20
be less than maxProperty). The property access strategy will be=20
pluggable and not limited to java beans (for example, allowing=20
map-backed storage, or buffered "form objects" on the rich client side=20=

of the house).
=95	Support for complex nested expressions (and/or/not), and all=20
relational operators (>, >=3D, <, <=3D, !=3D, =3D=3D).
=95	Support for applying different sets of rules based on context or=20=

use-case.
=95	A reporting subsystem capable of iterating over rule structures,=20=

performing validation, and capturing/generating error message results.=20=

This allows you to assemble complex rules on-the-fly without having to=20=

hard code a lot of static messages; the reporter is capable of=20
generating rule messages from the underlying structures automatically.
=95	Report field typing hints (the rules associated with a field to =
let=20
the user know what they're expected to type).
=95	Integration with Spring Rich Client Platform (RCP) and Spring =
MVC=20
environments.