How to call set of validations(non screen field) from with in the JSF life cycle

[suresh dasari]

Hi Ranchers,

I have an issue of how to call business rule validations which are already defined in some POJO classes after completing the screen field validations
so that if any errors in business rules then I no need to set the backing bean values instead same page will be displayed with whole bunch of errors.
with this approach it is guaranteed that update model values phase will be executed only when there are no errors (both business and screen field).

any help is appreciated.

[Tim Holloway]

The Backing Bean is a Model, but it shouldn't be considered the Business Model. It's the View Model. JSF will automatically update the Backing Bean if the GUI validations all pass, and there's no simple way to interfere with that process. Therefore, in cases like this, where you want business validation in addition to view validation, you should use the backing bean as a facade object, instead of the primary object.

We've had several discussions here about why in particular, it's not advisable to use Domain Model objects directly as backing beans.

Incidentally, if your backing bean does strongly resemble a deeper-layer object such as a Domain Model object, you might find the "dozer" data mover framework useful. The two types of objects need not be 100% identical. Dozer is available from sourceforce.net, and for people doing Maven builds, it's also available as a Maven Repository resource.