Grails save() dynamic method requires exception throwing to be enabled explicitly

http://www.grails.org/doc/latest/ref/Domain%20Classes/save.html:
Check out the failOnError option.

if( !b.save() ) {
   b.errors.each {
        println it
   }
}

OR

try{

b.save(failOnError :true)

}catch(ValidationException e){

//handle exception

}

However I could't find any ValidationException class in the package grails.validation of grails-1.2.1.

So went for the b.errors.each approach.