Also, Hibernate Validator 4.0.0 Alpha just came out, and I believe it's a reference implementation for JSR 303. Here are some relevant links:

• JSR #303 Bean Validation Public Review Ballot
• Hibernate Validator 4 alpha 1: the Bean Validation way
• Bean Validation Public Draft
• Detailed Public Draft Feedback

Oh, the spec itself would be good too. Here's the latest working version.

Thanks for that interesting introduction!

Personally, i'm kind of unhappy with JSR 303, since it doesn't provide the full power 'Design By Contract' (in form of preconditions for the case of formulating 'input' constraints, not talking about invariants and postcondtions) could give you.

I wonder why to be restricted to a limited set of constraints instead of being able to express custom conditions using an adequate constraint (or predicate) language.

In addition to that, i wonder why you explicitly have to apply a 'Helper' in order to get into action and trigger validation, which is pretty decoupled from the causer of the constraint violation (instead of obeying the stated contract 'permanently', whenever you try to call an annotated method, clearly pointing to the causer of the constraint violation).

For an example of DBC you might want to take a look at

http://gleichmann.wordpress.com/2007/11/21/springcontracts-design-by-contract-with-seamless-integration-into-spring-is-now-open-source/

for a first starting point (while there are of course some other solutions for DBC).

Greetings

Mario

I'm interested in how to "render Hibernate Validator error messages out using Spring Web MVC taglibs". Is there a better way than simply converting the Hibernate InvalidValue object to a BindingResult object?

@Mario: Thanks for the thoughts and link. I will check your blog post out.

@Chris: The approach I've taken so far is exactly the one you just described. Whether there's a better approach or not I don't know, but at some level it would seem that the conversion has to take place, even if Spring 3 ends up handling the conversion at the framework level (which is what I would expect).

We're not going to worry about integrating Hibernate Validator with Spring's native validation framework (so that, for instance, we might render Hibernate Validator error messages out using Spring Web MVC taglibs) though I'll probably write another article on that sometime in the future if people are interested

I'm interested :)

Thanks for the tutorial. That's really very explanatory.

I will have a question about the ClassValidator declaration. Let's assume User class extends the abstract class Person and getting annotations through Person class is needed.

ClassValidator personValidator = new ClassValidator (Person.class);

InvalidValue[] invalid Values = itemValidator.get Invalid Values(person);

I couldn't get it working. No invalid values are found. Is there a way to get invalid values in a child class of an abstract class through annotations?

The Person class might seem weird but I am just trying to illustrate the situation in my project. There exists an abstract class and there are many classes extending it. And there are custom validator annotations are declared in those classes and i want to validate these classes through one ClassValidator declaration but i couldn't succeed.

Any help would be appreciated!

I keep coming back to this article. Very useful and well-written - thank you!

many Thks

Great article, and your Manning book is coming along nicely!

Nice article , It helps to the begginers ...... thanks

The Hibernate 4.0, a reference implementation of the Bean validator, seems to be a different animal. The APIs are not the same, nor the usage.

@vicina: Yup, Hibernate 4 is the JSR 303 reference implementation now, and Hibernate 3.1 is now legacy.

(Oops, in the message above I meant "Hibernate Validator 4" and "Hibernate Validator 3.1.")

Regarding integrating Hibernate Validator with Spring, Spring 3 now supports this directly. See the Spring 3 reference docs.

Hi,

Its a very good article to start with hibernate validator framework..........

Thanks a lot for your outstanding article.

Excellent article.

hi, its working fine but if i configure it with class that extends "ListResourceBundle"

then i am not getting desired output.. is there any thing else i need to specify ?

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