StackOverflowError when using custom validator

[gsun]

Hi all,

I am playing with Roo 1.1.4.RELEASE [rev f787ce7], installed petclinic sample application through clinic.roo script, point the application to local PostgreSQL DB. Can launch application and create Owner data through http://localhost:8080/petclinic.

Then I want to include one custom validator to make sure that the email of the Owner is not duplicate. What I did:

1. create annotation UniqueEmail:

@Target({ElementType.TYPE})
@Documented
@Constraint(validatedBy = UniqueEmailValidator.class)
@Retention(RetentionPolicy.RUNTIME)
public @interface UniqueEmail {

    String message() default "{email-must-be-unique}";
    Class<?>[] groups() default {};
    Class<? extends Payload>[] payload() default {};
}

2. the implementation:

public class UniqueEmailValidator implements ConstraintValidator<UniqueEmail, Owner> {

    @Override
    public void initialize(UniqueEmail constraintAnnotation) {
    }

    @Override
    public boolean isValid(Owner owner, ConstraintValidatorContext context) {

        String email = owner.getEmail().toLowerCase();
        long count = (Long) Owner.entityManager().createQuery("select count(o) from Owner o where o.email = :email")
                .setParameter("email", email).getSingleResult();

        return count == 0;
    }

}

3. Change Owner class:

@RooJavaBean
@RooToString
@RooEntity
@UniqueEmail
public class Owner extends AbstractPerson {

    @OneToMany(cascade = CascadeType.ALL, mappedBy = "owner")
    private Set<Pet> pets = new HashSet<Pet>();
}

After that, when I start application through mvn tomcat:run, and try to insert one owner, I got StackOverflowError like below:

birthDay=2011-04-26 00:00:00.0, firstName=sdf, telephone=1234, homePage=sdf, version=0, city=sadf} 
2011-05-20 00:41:27,335 [http-8080-1] DEBUG org.hibernate.engine.ActionQueue - changes must be flushed to space: abstract_person 
2011-05-20 00:41:27,336 [http-8080-1] DEBUG org.springframework.beans.factory.annotation.InjectionMetadata - Processing injected method of bean 'com.springsource.petclinic.domain.AbstractPerson$1': PersistenceElement for transient javax.persistence.EntityManager com.springsource.petclinic.domain.AbstractPerson.entityManager 
2011-05-20 00:41:27,345 [http-8080-1] DEBUG org.springframework.orm.jpa.JpaTransactionManager - Initiating transaction rollback after commit exception 
java.lang.StackOverflowError
	at java.lang.StringCoding.deref(StringCoding.java:46)
	at java.lang.StringCoding.encode(StringCoding.java:258)
	at java.lang.String.getBytes(String.java:946)
	at java.io.UnixFileSystem.getBooleanAttributes0(Native Method)
	at java.io.UnixFileSystem.getBooleanAttributes(UnixFileSystem.java:228)
	at java.io.File.exists(File.java:733)
	at org.apache.naming.resources.FileDirContext.file(FileDirContext.java:785)
	at org.apache.naming.resources.FileDirContext.lookup(FileDirContext.java:206)
	at org.apache.naming.resources.ProxyDirContext.lookup(ProxyDirContext.java:299)
	at org.apache.catalina.loader.WebappClassLoader.findResourceInternal(WebappClassLoader.java:2807)
	at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2668)
	at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1124)
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1612)
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1491)
	at com.springsource.petclinic.util.UniqueEmailValidator.isValid(UniqueEmailValidator.java:19)
	at com.springsource.petclinic.util.UniqueEmailValidator.isValid(UniqueEmailValidator.java:1)
	at org.hibernate.validator.engine.ConstraintTree.validateSingleConstraint(ConstraintTree.java:153)
	at org.hibernate.validator.engine.ConstraintTree.validateConstraints(ConstraintTree.java:140)
	at org.hibernate.validator.metadata.MetaConstraint.validateConstraint(MetaConstraint.java:121)
	at org.hibernate.validator.engine.ValidatorImpl.validateConstraint(ValidatorImpl.java:327)
	at org.hibernate.validator.engine.ValidatorImpl.validateConstraintsForRedefinedDefaultGroup(ValidatorImpl.java:273)
	at org.hibernate.validator.engine.ValidatorImpl.validateConstraintsForCurrentGroup(ValidatorImpl.java:256)
	at org.hibernate.validator.engine.ValidatorImpl.validateInContext(ValidatorImpl.java:210)
	at org.hibernate.validator.engine.ValidatorImpl.validate(ValidatorImpl.java:119)
	at org.hibernate.cfg.beanvalidation.BeanValidationEventListener.validate(BeanValidationEventListener.java:136)
	at org.hibernate.cfg.beanvalidation.BeanValidationEventListener.onPreInsert(BeanValidationEventListener.java:94)
	at org.hibernate.action.EntityInsertAction.preInsert(EntityInsertAction.java:178)
	at org.hibernate.action.EntityInsertAction.execute(EntityInsertAction.java:72)
	at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:273)
	at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:265)
	at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:184)
	at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321)
	at org.hibernate.event.def.DefaultAutoFlushEventListener.onAutoFlush(DefaultAutoFlushEventListener.java:64)
	at org.hibernate.impl.SessionImpl.autoFlushIfRequired(SessionImpl.java:1185)
	at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1261)
	at org.hibernate.impl.QueryImpl.list(QueryImpl.java:102)
	at org.hibernate.ejb.QueryImpl.getSingleResult(QueryImpl.java:274)
	at com.springsource.petclinic.util.UniqueEmailValidator.isValid(UniqueEmailValidator.java:19)
	at com.springsource.petclinic.util.UniqueEmailValidator.isValid(UniqueEmailValidator.java:1)
	at org.hibernate.validator.engine.ConstraintTree.validateSingleConstraint(ConstraintTree.java:153)
	at org.hibernate.validator.engine.ConstraintTree.validateConstraints(ConstraintTree.java:140)
	at org.hibernate.validator.metadata.MetaConstraint.validateConstraint(MetaConstraint.java:121)
	at org.hibernate.validator.engine.ValidatorImpl.validateConstraint(ValidatorImpl.java:327)
	at org.hibernate.validator.engine.ValidatorImpl.validateConstraintsForRedefinedDefaultGroup(ValidatorImpl.java:273)
	at org.hibernate.validator.engine.ValidatorImpl.validateConstraintsForCurrentGroup(ValidatorImpl.java:256)
	at org.hibernate.validator.engine.ValidatorImpl.validateInContext(ValidatorImpl.java:210)
	at org.hibernate.validator.engine.ValidatorImpl.validate(ValidatorImpl.java:119)
	at org.hibernate.cfg.beanvalidation.BeanValidationEventListener.validate(BeanValidationEventListener.java:136)
	at org.hibernate.cfg.beanvalidation.BeanValidationEventListener.onPreInsert(BeanValidationEventListener.java:94)
	at org.hibernate.action.EntityInsertAction.preInsert(EntityInsertAction.java:178)
	at org.hibernate.action.EntityInsertAction.execute(EntityInsertAction.java:72)
	at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:273)
	at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:265)
	at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:184)
	at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:321)
	at org.hibernate.event.def.DefaultAutoFlushEventListener.onAutoFlush(DefaultAutoFlushEventListener.java:64)
	at org.hibernate.impl.SessionImpl.autoFlushIfRequired(SessionImpl.java:1185)
	at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1261)
	at org.hibernate.impl.QueryImpl.list(QueryImpl.java:102)

Please see attached log file (application.zip) for more details.

Can someone help me to figure out where can be the problem?

Thank you in advance,
george