Enver throws Nullpointer exception with a self reference entities ----------------------------------------------------------------- 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 -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://opensource.atlassian.com/projects/hibernate/secure/Administrators.... - For more information on JIRA, see: http://www.atlassian.com/software/jira