Hi all,

I have a bean as following. Shortly, I am validating it and all I am printing all validation errors to screen. However before validating next one, I just want to validate in ordered sequence.



I am validating like this



In our case I want to validate first of all NotEmpty then IsCardBannedNumber then IsValidCardNumber.... But at most I want to see just one error or instead of "Set<ConstraintViolation<Object>>" I want an ordered error set ... How can I do this?

Thanks

To solve your problem you have to look at two things. First the @GroupSequence annotation. Per default the validation order is undetermined. To enforce an order you have to create an interface like so:



and then validate like so:



If you only want to have one single error you should look at the composing constraint feature. You would have to build a new constraint called for example @ValidCreditCard. Check the online documentation for composing constraints. Once you have a custom constraint you can use @ReportAsSingleViolation annotation to only report a single violation.

--Hardy

Dear Hardy,

Thanks for your answer. I understood the first part. But I have a little problem understanding second part. When I am using ReportAsSingleViolation, which validation message will be shown? Because in this example
I can see that it has own message?

Thanks

That's correct. If you use @ReportAsSingleViolation you will get the error message of the composed constraint (not the error messages from the failing constraints). I just mentioned @ReportAsSingleViolation for completeness.

I also noticed that I made a mistake in my example. So here is the right version:






As side effect you will only get a single violation if something goes wrong. If for example @IsCardBannedNumber fails the validation will terminate without evaluating @IsValidCardNumber.

Sorry about the wrong example earlier.

--Hardy

Hi,

1 ) But what If I want to use messages of constraints instead of compound constraint message?

Thanks

In the previous example I am not using composed constraints. I am just using the groups feature in conjunction with @GroupSequence.

Composed constraint come in to play, when you would like to encapsulate the three constraints you are currently placing on the string into a single constraint like @MyCreditCardCheck. If you within the MyCreditCardCheck annotation define @ReportAsSingleVioation you would only get the error message of defined in the annotation. However, this is optional. Without @ReportAsSingleVioation the errors from the composing constraints gets propagated.

Are things clearer now?

--hardy

Hi,

I understood clearly everything but I have a still problem




In case a error, It is raising error message of "org.hibernate.validator.constraints.NotEmpty.message", but I want to delegate this error message to checked constraints. For example, in case a NotNull error, I want to show its error message.

I hope that my question is clear?

Thanks

You would have to remove @ReportAsSingleViolation. Of course you cannot do this in the built-in NotEmpty constraint. If you need this functionality for the NotEmpty constraint you will have to create a MyNotEmpty constraint.