How do I make ConstraintValidator<Past, TimestampParam> work

boris73 · **Joined:** Wed Jul 13, 2011 9:40 pm **Posts:** 4

Basically I want to use the javax.validation.constraints.Past annotation with with my own timestamp class.
So I wrote a ConstraintValidator:

Code:

public class PastValidator implements ConstraintValidator<Past, Timestamp>
{
   /* (non-Javadoc)
    * @see javax.validation.ConstraintValidator#initialize(java.lang.annotation.Annotation)
    */
   @Override
   public void initialize(final Past past) {  }

   /* (non-Javadoc)
    * @see javax.validation.ConstraintValidator#isValid(java.lang.Object, javax.validation.ConstraintValidatorContext)
    */
   @Override
   public boolean isValid(final Timestamp tsParam, final ConstraintValidatorContext context) {
      
      return (tsParam==null || tsParam.getTime()<System.currentTimeMillis());
   }
}

I'm trying to then validate a timestamp being passed to a method:

Code:

public void method(@Past Timestamp t) {
...
}

using AspectJ to inject the validation code. What I get is this:

Quote:

javax.validation.UnexpectedTypeException: No validator could be found for type: com.test.Timestamp
at org.hibernate.validator.engine.ConstraintTree.verifyResolveWasUnique(ConstraintTree.java:383)
at org.hibernate.validator.engine.ConstraintTree.findMatchingValidatorClass(ConstraintTree.java:364)
at org.hibernate.validator.engine.ConstraintTree.getInitializedValidator(ConstraintTree.java:313)
at org.hibernate.validator.engine.ConstraintTree.validateConstraints(ConstraintTree.java:144)
at org.hibernate.validator.engine.ConstraintTree.validateConstraints(ConstraintTree.java:117)
at org.hibernate.validator.metadata.MetaConstraint.validateConstraint(MetaConstraint.java:84)
at org.hibernate.validator.engine.ValidatorImpl.validateParameterForGroup(ValidatorImpl.java:1001)
at org.hibernate.validator.engine.ValidatorImpl.validateParametersForGroup(ValidatorImpl.java:934)
at org.hibernate.validator.engine.ValidatorImpl.validateParametersInContext(ValidatorImpl.java:864)
at org.hibernate.validator.engine.ValidatorImpl.validateAllParameters(ValidatorImpl.java:225)

Looking at the validators that hibernate uses internally, I can't see any difference to how they support Date and Calendar. Does anyone have any ideas on how to make this work? Do I have to define my own Annotation for Past for my custom class?

FYI, I'm using:

<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
<version>4.2.0.Final</version>
</dependency>

In my project.

thanks,

matt

hardy.ferentschik · **Posted:** Thu Jul 14, 2011 4:45 am

Hi,

if you want to provide a new ConstraintValidator for an existing constraint you need to register it via xml (see also http://docs.jboss.org/hibernate/stable/ ... e/#d0e2143 or the BV spec). Basically you need to xml files

1. validation.xml (in META-INF/validation.xml) to enable xml configuration

Code:

<validation-config xmlns="http://jboss.org/xml/ns/javax/validation/configuration"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://jboss.org/xml/ns/javax/validation/configuration">
    <constraint-mapping>path/to/my/custom/xml/custom-constraints.xml</constraint-mapping>
</validation-config>

2. custom-constraints.xml (or whatever you want to call it)

Code:

<?xml version="1.0" encoding="UTF-8"?>
<constraint-mappings xmlns="http://jboss.org/xml/ns/javax/validation/mapping"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://jboss.org/xml/ns/javax/validation/mapping">
<constraint-mappings>
    <constraint-definition annotation="javax.validation.constraints.Past">
        <validated-by include-existing-validators="false">
            <value>foo.bar.PastValidator</value>
        </validated-by>
    </constraint-definition>
</constraint-mappings>

Hope this helps.

--Hardy

boris73 · **Joined:** Wed Jul 13, 2011 9:40 pm **Posts:** 4

Thanks, I'll give that a shot... I can't tell you how long I was searching google for the right set of key words for this :)

Gunnar · **Joined:** Sat Jan 24, 2009 12:46 pm **Posts:** 388

Hi,

I've described the required steps for adding validators for the @Past/@Future constraints also in this blog post I wrote a while ago. Note that the post is about adding support for the Joda time API, in between these types are supported out of the box by HV 4.2.

Hth,

--Gunnar

boris73 · **Joined:** Wed Jul 13, 2011 9:40 pm **Posts:** 4

Thanks. I finally got around to trying this out and it works great!