[hibernate-issues] [Hibernate-JIRA] Created: (HHH-3923) Enver throws Nullpointer exception with a self reference entities

[Tahseen Ur Rehman (JIRA)]

Enver throws Nullpointer exception with a self reference entities
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                 Key: HHH-3923
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3923
             Project: Hibernate Core
          Issue Type: Bug
          Components: envers
    Affects Versions: 3.3.1
         Environment: Hibernate Version: 3.3.1.GA
Database: Mysql 5.0
            Reporter: Tahseen Ur Rehman
            Priority: Blocker


@Entity(name = "category")
@Audited
public class Category {
	@Id
	@GeneratedValue(strategy = GenerationType.AUTO)
	private int id;

	private String name;

	@ManyToOne
	private Category parent;

	@OneToMany(mappedBy = "parent")
	private List<Category> childerns = new ArrayList<Category>();
        
        ....

}


Exception:

Exception in thread "main" java.lang.ExceptionInInitializerError
	at com.carbonetworks.footprint.Footprint.initHibernate(Footprint.java:125)
	at com.carbonetworks.footprint.Footprint.init(Footprint.java:73)
	at com.carbonetworks.footprint.Main.main(Main.java:36)
Caused by: javax.persistence.PersistenceException: [PersistenceUnit: footprint] Unable to build EntityManagerFactory
	at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:677)
	at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:126)
	at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:52)
	at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:34)
	at com.carbonetworks.footprint.Footprint.initHibernate(Footprint.java:109)
	... 2 more
Caused by: org.hibernate.HibernateException: could not init listeners
	at org.hibernate.event.EventListeners.initializeListeners(EventListeners.java:205)
	at org.hibernate.cfg.Configuration.getInitializedEventListeners(Configuration.java:1338)
	at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1327)
	at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:867)
	at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:669)
	... 6 more
Caused by: java.lang.NullPointerException
	at org.hibernate.envers.configuration.metadata.CollectionMetadataGenerator.addOneToManyAttached(CollectionMetadataGenerator.java:164)
	at org.hibernate.envers.configuration.metadata.CollectionMetadataGenerator.addCollection(CollectionMetadataGenerator.java:150)
	at org.hibernate.envers.configuration.metadata.AuditMetadataGenerator.addValue(AuditMetadataGenerator.java:141)
	at org.hibernate.envers.configuration.metadata.AuditMetadataGenerator.addProperties(AuditMetadataGenerator.java:161)
	at org.hibernate.envers.configuration.metadata.AuditMetadataGenerator.generateSecondPass(AuditMetadataGenerator.java:385)
	at org.hibernate.envers.configuration.EntitiesConfigurator.configure(EntitiesConfigurator.java:96)
	at org.hibernate.envers.configuration.AuditConfiguration.<init>(AuditConfiguration.java:86)
	at org.hibernate.envers.configuration.AuditConfiguration.getFor(AuditConfiguration.java:99)
	at org.hibernate.envers.event.AuditEventListener.initialize(AuditEventListener.java:249)
	at org.hibernate.event.EventListeners$1.processListener(EventListeners.java:198)
	at org.hibernate.event.EventListeners.processListeners(EventListeners.java:181)
	at org.hibernate.event.EventListeners.initializeListeners(EventListeners.java:194)
	... 10 more



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