which beanValidator should be used with constrain validation

[sam White]

Hi,

With spring mvc 3.0, I am confused about using BeanValidator with constrain validation.:

Set<ConstraintViolation<AdminSignupBean>> violations = beanValidator.validate(adminsignup);
                for(ConstraintViolation<AdminSignupBean> violation : violations) {
                    logger.debug("=========Violation Message:- " + violation.getMessage());
                }

The beanValidator as shown above is confusing me, I can't find an import lib to use.
This example is referenced with an example in the following link:

http://stackoverflow.com/questions/1972933/cross-field-validation-with-hibernate-validator-jsr-303


Any suggestion is very appreciated.
Thanks
Sam

[Bill Gorder]

beanValidator is just the name he chose not the type. Validator is defined in javax.validation.Validator. You would use the factory to get an instance

import javax.validation.ConstraintViolation;
import javax.validation.Validation;
import javax.validation.Validator;
import javax.validation.ValidatorFactory;

import org.junit.BeforeClass;
import org.junit.Test;

public class MyTest {

    private static Validator validator;

    @BeforeClass
    public static void setUp() {
        ValidatorFactory factory = Validation.buildDefaultValidatorFactory();
        validator = factory.getValidator();
    }
}

Some containers will provide their own implementations of Validator which may or may not cause you problems if you wanted to force it to use the Hibernate validator implementation for example you could do something like this

    private ValidatorFactory validatorFactory = Validation.byProvider(HibernateValidator.class)
                                                 .configure().buildValidatorFactory();
    ...

    public void someMethod(){
        validatorFactory.getValidator().validate(myObject);
    }

Keep in mind the Validator is NOT thread safe. Validator Factories are.

[sam White]

Thank you very much for the solution, that works.
Do you know how to display the error message on jsp?

At the moment, when error occurs, the page returns to the page, but no error message shown up on the page.

Here is my jsp file:

<tr> <td><form:label for="password" path="password" > Password:</form:label></td> <td colspan="2"><form:password path="password" size="40" id="password" name="password"/></td> <td colspan="2"><form:errors path="password" cssClass="error" /></td> </tr> <tr> <td><form:label for="confirmPassword" path="password" > Confirm Password:</form:label></td> <td colspan="2"><form:password path="confirmPassword" size="40" id="confirmPassword"/></td> <td colspan="2"><form:errors path="confirmPassword" cssClass="error" /></td> </tr>

Controller:

public String submitProduct(HttpServletRequest req, Model model, 
			 @ModelAttribute("adminsignup")AdminSignupBean adminsignup,
                         BindingResult result)
	{	
		UUID pbid=adminsignup.getPbid();
                logger.debug("====adminsignup:"+adminsignup.toString());

                if (result.hasErrors()) {
                    return "adminsignup/createadmin";
                }
                Set<ConstraintViolation<AdminSignupBean>> violations 
                        = validatorFactory.getValidator().validate(adminsignup);
                for(ConstraintViolation<AdminSignupBean> violation : violations) {
                    logger.debug("=========Violation Message:- " + violation.getMessage());
                    return "adminsignup/createadmin";
                }

And... With the above controller code, how to combine the "general" binding result wiht the one shown in Violation into one?
Thanks
Sam

[honey free]

Keep in mind the Validator is NOT thread safe. Validator Factories are.