Custom validation in Spring MVC 3

[fulat2k]

Hi folks,

I've read through tutorials and docs pertaining to validation in Spring MVC 3 with the implementation of JSR303. No doubt using annotations is handy; what about custom validation required on a field? Can I specify a method or class where I can implement custom code to validate a username value against the DB instead of plainly checking for null and its length using annotations?


Thanks.

[emil2010]

Basicly I create a validator for each class that I need to custom validate.
In this case Im forcing users to select something from a AcademicDegree dropdown list id = -1 means the user hasnt selected anything.

Hope this helps.

public class AcademicDegreeValidator implements Validator {

	@Override
	public boolean supports(Class clazz) {
		return AcademicDegree.class.equals(clazz);
	}

	@Override
	public void validate(Object obj, Errors e) {
		//ValidationUtils.rejectIfEmpty(e, "AcademicDegree", "AcademicDegree.empty");
		AcademicDegree a = (AcademicDegree) obj;
		if(a.getId() < 1L){
			e.rejectValue("academicDegree", "academic_degree_not_selected_error_message");
		}
			
		
	}

}