Cascade problem when bidir OneToMany overlaps with OneToOne ----------------------------------------------------------- Key: HHH-1654 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-1654 Project: Hibernate Core Issue Type: Bug Environment: JBoss 4.0.4RC1, any database Reporter: Jeff Schnitzer Attachments: ContainerTest6-DenseRelationships.zip Given the following relationships: Parent has N children (one-to-many) Child has 1 parent (many-to-one, the bidir relationship) Parent has 1 "default" child (one-to-one) Hibernate is unable to persist this. The code I expect to work: Parent p = new Parent(); p.setChildren(new HashSet<Child>()); Child ch = new Child(p); p.getChildren().add(ch); p.setDefaultChild(ch); this.em.persist(p); However, it's possible to make it work by relaxing the NOT NULL constraint on the defaultChild relationship and rearranging the order of method calls: Parent p = new Parent(); p.setChildren(new HashSet<Child>()); Child ch = new Child(p); p.getChildren().add(ch); this.em.persist(p); p.setDefaultChild(ch); Of course, Hibernate works fine the one-to-one relationship is eliminated. Here is the exception produced by the first code sequence: Caused by: org.hibernate.PropertyValueException: not-null property references a null or transient value: test.Child.parent at org.hibernate.engine.Nullability.checkNullability(Nullability.java:72) at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:265) at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:167) at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:101) at org.hibernate.event.def.DefaultPersistEventListener.entityIsTransient(DefaultPersistEventListener.java:131) at org.hibernate.event.def.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:87) at org.hibernate.impl.SessionImpl.firePersist(SessionImpl.java:633) at org.hibernate.impl.SessionImpl.persist(SessionImpl.java:625) at org.hibernate.engine.CascadingAction$8.cascade(CascadingAction.java:202) at org.hibernate.engine.Cascade.cascadeToOne(Cascade.java:213) at org.hibernate.engine.Cascade.cascadeAssociation(Cascade.java:157) at org.hibernate.engine.Cascade.cascadeProperty(Cascade.java:108) at org.hibernate.engine.Cascade.cascade(Cascade.java:248) at org.hibernate.event.def.AbstractSaveEventListener.cascadeBeforeSave(AbstractSaveEventListener.java:385) at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:242) at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:167) at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:101) at org.hibernate.event.def.DefaultPersistEventListener.entityIsTransient(DefaultPersistEventListener.java:131) at org.hibernate.event.def.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:87) at org.hibernate.event.def.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:38) at org.hibernate.impl.SessionImpl.firePersist(SessionImpl.java:642) at org.hibernate.impl.SessionImpl.persist(SessionImpl.java:616) at org.hibernate.impl.SessionImpl.persist(SessionImpl.java:620) at org.hibernate.ejb.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:127) at org.jboss.ejb3.entity.InjectedEntityManager.persist(InjectedEntityManager.java:141) at test.GoBean.go(GoBean.java:30) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:109) at org.jboss.ejb3.AllowedOperationsInterceptor.invoke(AllowedOperationsInterceptor.java:47) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:98) at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:79) ... 41 more A test case is attached.