Validation

breako · **Joined:** Mon Jul 24, 2006 8:43 am **Posts:** 160

Hi,
All hibernate validation seems to happen during the commit. For example suppose I have the POJO:

Code:

public class Person {
    private String lastName;
    
   @Length(
        min = 0, max = 5, message = "Minimum {min}, maximum {max}   characters."
    )
    public String getLastName() {
         return lastName;
    }

    public void setLastName(String lastName) {
         this.lastName = lastName;
    }
}

and my application code is:

Code:

person.setLastName("123456789");

This is allowed, the exception is not thrown until commit is called.
I would have thought it would make more sense to throw an exception earlier?
Comments appreciated

scesbron · **Joined:** Thu Sep 04, 2003 8:23 am **Posts:** 368

But how do you want to do that ?
You would have to instrument your bit code or use AOP to intercept set call and verify constraints based on annotations when calling the setter.
This is not the case now. If you want to validate your object earlier, you can use ClassValidator.getInvalidValues(T)

emmanuel · **Posted:** Thu Apr 12, 2007 4:28 pm

JBoss Seam check the validity when the web form is received.
If you think about it, validations has to be triggered by something. And when the setter is used in not a good time

breako · **Joined:** Mon Jul 24, 2006 8:43 am **Posts:** 160

emmanuel wrote:

JBoss Seam check the validity when the web form is received.
If you think about it, validations has to be triggered by something. And when the setter is used in not a good time

Ok, thanks for that.

Dosihris · **Joined:** Sat Dec 09, 2006 12:02 pm **Posts:** 26

Is here a solution right now? Maybe with an example?

I wanna generate my pojos with validating annotations ( e.g. @Length(
min = 0, max = 5, message = "Minimum {min}, maximum {max} characters."
) , and then i need to validate them...

Is there a tutorial or something else to implement this to my AbstractWizardFormController

eyall · **Joined:** Wed Aug 24, 2005 5:32 am **Posts:** 23

Hi,
I usually write frameworks for JEE application - so I trigger the validation
automatically using AOP interceptor somewhere between the application
service and the form. The code to invoke Hibernate validation is simple.
Here is an example:

Code:

      Item i = new Item();
      i.setPrice(3.3f);
      ClassValidator<Item> classValidator = new 
            ClassValidator<Item>(Item.class);
      InvalidValue[] values = classValidator.getInvalidValues(i);
                
      for (InvalidValue value : values) {
                 System.out.println(value); //Will print the message
      }

I wrote about it on my blog, you can see it at:
http://www.jroller.com/page/eyallupu?entry=hibernate_validation_framework

I also explain on the blog some advanced Hibernate validator features - like how to write custom validators.

Eyal Lupu

Dosihris · **Joined:** Sat Dec 09, 2006 12:02 pm **Posts:** 26

Hi eyall,

you wrote that you have annotated your properties with some rules.

Can you explain, how to generate all these rules on the properties? The properties are already generated with hibernate tools. is there a way to generate them with the annotations? (Withyout deleting the database... :-))

Dosi