java - ConstraintValidatorContext to define custom error messages -

i want create custom email validator using annotations. this solution useful while creating validator. here's annotation :

@target({elementtype.method, elementtype.field, elementtype.annotation_type,           elementtype.constructor, elementtype.parameter}) @retention(retentionpolicy.runtime) @constraint(validatedby = {commonsemailvalidator.class}) @documented @reportassingleviolation public @interface exemailvalidator {  string message() default "        {org.hibernate.validator.constraints.email.message}";  class<?>[] groups() default {};  class<? extends payload>[] payload() default {};  @target({elementtype.method, elementtype.field, elementtype.annotation_type,          elementtype.constructor, elementtype.parameter}) @retention(retentionpolicy.runtime) @documented public @interface list { exemailvalidator[] value(); } } 

and here's class commonsemailvalidator :

public class commonsemailvalidator implements         constraintvalidator<exemailvalidator, string> { private static final boolean allow_local = false; private emailvalidator realvalidator =        emailvalidator.getinstance(allow_local);  @override public void initialize(exemailvalidator email) { // todo auto-generated method stub   } @override public boolean isvalid(string email, constraintvalidatorcontext         constraintvalidatorcontext) {  if( email == null ) return true;  return realvalidator.isvalid(email);  }   } 

i run project, but, when click submit on registration form, while email format not valid have following exception :

request processing failed; nested exception javax.validation.constraintviolationexception: validation failed classes [...] during persist time groups [javax.validation.groups.default, ]

the exception excpected, instead of showing 500 error, see error message explaning what's wrong. so, think have use constraintvalidatorcontext define custom error messages. but, don't know how it. ideas please ?

you should use @controlleradvice , handle validation exceptions there @exceptionhandler(methodargumentnotvalidexception.class) example.