[hibernate-issues] [Hibernate-JIRA] Commented: (HV-438) Call to TraversableResolver.isReachable() threw an exception

[Michael Schnell (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HV-438?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=42749#action_42749 ] 

Michael Schnell commented on HV-438:
------------------------------------

I get the same error (Hibernate Validator / 4.0.2.GA) but in my case the JPATraversableResolver seems to cause the problem:

public class JPATraversableResolver implements TraversableResolver {

   // TODO Check the call to PersistenceUtil. traversableProperty.getName() is this correct?
   public boolean isReachable(Object traversableObject, Path.Node traversableProperty, Class<?> rootBeanType, Path pathToTraversableObject, ElementType elementType) {
    return traversableObject == null ||
    Persistence.getPersistenceUtil().isLoaded( traversableObject, traversableProperty.getName() );
  }
  :
}

The problem seems to be that in the case of a (custom) class constraint "traversableProperty.getName()" returns NULL and that leads to the same NullPointerException. The "TODO" in the source seems to describe exactly the problem.

Caused by: java.lang.NullPointerException
	at java.lang.Class.searchFields(Class.java:2599)
	at java.lang.Class.getDeclaredField(Class.java:1880)
	at org.hibernate.ejb.util.PersistenceUtilHelper$MetadataCache.findMember(PersistenceUtilHelper.java:190)
	at org.hibernate.ejb.util.PersistenceUtilHelper$MetadataCache.getMember(PersistenceUtilHelper.java:178)
	at org.hibernate.ejb.util.PersistenceUtilHelper.get(PersistenceUtilHelper.java:91)
	at org.hibernate.ejb.util.PersistenceUtilHelper.isLoadedWithReference(PersistenceUtilHelper.java:83)
	at org.hibernate.ejb.HibernatePersistence$1.isLoadedWithReference(HibernatePersistence.java:93)
	at javax.persistence.Persistence$1.isLoaded(Persistence.java:83)
	at org.hibernate.validator.engine.resolver.JPATraversableResolver.isReachable(JPATraversableResolver.java:33)
	at org.hibernate.validator.engine.resolver.DefaultTraversableResolver.isReachable(DefaultTraversableResolver.java:112)
	at org.hibernate.validator.engine.resolver.SingleThreadCachedTraversableResolver.isReachable(SingleThreadCachedTraversableResolver.java:47)
	at org.hibernate.validator.engine.ValidatorImpl.isValidationRequired(ValidatorImpl.java:764)


> Call to TraversableResolver.isReachable() threw an exception
> ------------------------------------------------------------
>
>                 Key: HV-438
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HV-438
>             Project: Hibernate Validator
>          Issue Type: Bug
>          Components: engine
>    Affects Versions: 4.1.0.Final, 4.2.0.Beta1
>         Environment: hibernate 3.6.1.Final and hibernate validator 4.1.0.Final, GlassFish Server Open Source Edition 3.0.1, Spring 3.0.5 
>            Reporter: Denis Chapligin
>            Assignee: Hardy Ferentschik
>         Attachments: build.xml, hvbug.properties, validator-issue.zip
>
>
> I have a problem with custom class level constraint. When I try to validate a simple entity, like:
> {code}
> @Entity
> @Table(name="users")
> @Unique //My custom constraint
> public class User implements Serializable {
>     @Id
>     @GeneratedValue(strategy = GenerationType.IDENTITY)
>     @Column(name="id")
>     private Integer id;
> }
> {code}
> using a spring validation helper:
> {code}
> User u = new User();
> Errors result = new BindException(u, "User");
> validator.validate(u, result);
> {code}
> It throws a {{NullPointerException}}: 
> {noformat}
> Caused by: java.lang.NullPointerException
>         at java.lang.Class.searchFields(Class.java:2599)
>         at java.lang.Class.getDeclaredField(Class.java:1880)
>         at org.hibernate.ejb.util.PersistenceUtilHelper$MetadataCache.findMember(PersistenceUtilHelper.java:190)
>         at org.hibernate.ejb.util.PersistenceUtilHelper$MetadataCache.getMember(PersistenceUtilHelper.java:178)
>         at org.hibernate.ejb.util.PersistenceUtilHelper.get(PersistenceUtilHelper.java:91)
>         at org.hibernate.ejb.util.PersistenceUtilHelper.isLoadedWithReference(PersistenceUtilHelper.java:83)
>         at org.hibernate.ejb.HibernatePersistence$1.isLoadedWithReference(HibernatePersistence.java:93)
>         at javax.persistence.Persistence$PersistenceUtilImpl.isLoaded(Persistence.java:120)
>         at org.hibernate.validator.engine.resolver.JPATraversableResolver.isReachable(JPATraversableResolver.java:33)
>         at org.hibernate.validator.engine.resolver.DefaultTraversableResolver.isReachable(DefaultTraversableResolver.java:112)
>         at org.hibernate.validator.engine.resolver.SingleThreadCachedTraversableResolver.isReachable(SingleThreadCachedTraversableResolver.java:47)
>         at org.hibernate.validator.engine.ValidatorImpl.isValidationRequired(ValidatorImpl.java:764)
> {noformat}
> Some investigation revealed, that in PersistenceUtil calls the 'property' parameter value is null and in the validator.engine functions 'name' var in value of the first and single entry of propertyPath.nodeList is null too.
> Most interested thing is that when i try validation code, shown above, in JUnit environment, it works well. 
> I've attached a simple webapp, that reproduces the issue. It is too big, to be uploaded here, so i put it to the dropbox: http://dl.dropbox.com/u/17691684/hvbug.tar.gz Initial report was on hibernate forums: https://forum.hibernate.org/viewtopic.php?f=9&t=1009612&start=0

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