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org.hibernate.HibernateException: Unable to resolve property: null	at org.hibernate.tuple.entity.EntityMetamodel.getPropertyIndex(EntityMetamodel.java:1215)	at org.hibernate.persister.entity.AbstractEntityPersister.getPropertyIndex(AbstractEntityPersister.java:2406)	at org.hibernate.engine.spi.EntityEntry.getLoadedValue(EntityEntry.java:289)	at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:188)	at org.hibernate.engine.internal.Cascade.cascadeCollectionElements(Cascade.java:381)	at org.hibernate.engine.internal.Cascade.cascadeCollection(Cascade.java:321)	at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:298)	at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:161)	at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:118)	at org.hibernate.event.internal.AbstractFlushingEventListener.cascadeOnFlush(AbstractFlushingEventListener.java:167)	at org.hibernate.event.internal.AbstractFlushingEventListener.prepareEntityFlushes(AbstractFlushingEventListener.java:158)	at org.hibernate.event.internal.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:91)	at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:55)	at org.hibernate.internal.SessionImpl.flush(SessionImpl.java:1218)	at org.hibernate.internal.SessionImpl.managedFlush(SessionImpl.java:421)	at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.beforeTransactionCommit(JdbcTransaction.java:101)	at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.commit(AbstractTransactionImpl.java:177)	at org.hibernate.test.manytomany.mapunique.ManyToManyUniqueDelOrphanTest.testManyToManyWithCascadeDeleteOrphan(ManyToManyUniqueDelOrphanTest.java:62)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:606)	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)	at org.hibernate.testing.junit4.ExtendedFrameworkMethod.invokeExplosively(ExtendedFrameworkMethod.java:62)	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)	at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)	at org.junit.internal.runners.statements.FailOnTimeout$StatementThread.run(FailOnTimeout.java:74)