validation - Hibernate validator: @Email accepts ask@stackoverflow as valid?

Question

I'm using the @Email annotation to validate an e-mail address. The issue I'm having is that it's accepting things like ask@stackoverflow as a valid e-mail address. I guess this is because they want to support intranet addresses, but I can't seem to find a flag so it does check for an extension.

Do I really need to switch to @Pattern (and any recommendations for an e-mail pattern that's flexible) or am I missing something?

Answer 1

You can also use constraint composition as a work-around. In the example below, I rely on the @Email validator to do the main validation, and add a @Pattern validator to make sure the address is in the form of x@y.z (I don't recommend using just the @Pattern below for regular Email validation)

@Email(message="Please provide a valid email address")
@Pattern(regexp=".+@.+\..+", message="Please provide a valid email address")
@Target( { METHOD, FIELD, ANNOTATION_TYPE })
@Retention(RUNTIME)
@Constraint(validatedBy = {})
@Documented
public @interface ExtendedEmailValidator {
    String message() default "Please provide a valid email address";
    Class<?>[] groups() default {};
    Class<? extends Payload>[] payload() default {};
}