GSP validations without domain classes

Hi

I have some textfields like email, name, mobile etc on a gsp page. I just want to validate them before saving in database, without using javascript at gsp page .
Is there any mechanism to do this in controller or somewhere else. And i am populating a bean by those parameters.

Something like this?

http://www.grails.org/Command+objects+and+Form+Validation

You can always just call domainInstance.validate().

Thanks Xymor Actually i was looking for something like this only