Hibernate更新数据，报错，求教大侠指点，万分感谢


Exception in thread "pool-1-thread-1" org.springframework.dao.InvalidDataAccessApiUsageException: object references an unsaved transient instance - save the transient instance before flushing: com.siebre.assessment.DmtmQuarterAssessmentRequestImpl; nested exception is org.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient instance before flushing: com.siebre.assessment.DmtmQuarterAssessmentRequestImpl
Caused by: org.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient instance before flushing: com.siebre.assessment.DmtmQuarterAssessmentRequestImpl
at org.hibernate.engine.ForeignKeys.getEntityIdentifierIfNotUnsaved(ForeignKeys.java:219)
at org.hibernate.type.EntityType.getIdentifier(EntityType.java:397)
at org.hibernate.type.ManyToOneType.isDirty(ManyToOneType.java:242)
at org.hibernate.type.TypeFactory.findDirty(TypeFactory.java:597)
at org.hibernate.persister.entity.AbstractEntityPersister.findDirty(AbstractEntityPersister.java:3123)
at org.hibernate.event.def.DefaultFlushEntityEventListener.dirtyCheck(DefaultFlushEntityEventListener.java:479)
at org.hibernate.event.def.DefaultFlushEntityEventListener.isUpdateNecessary(DefaultFlushEntityEventListener.java:204)
at org.hibernate.event.def.DefaultFlushEntityEventListener.onFlushEntity(DefaultFlushEntityEventListener.java:127)
at org.hibernate.event.def.AbstractFlushingEventListener.flushEntities(AbstractFlushingEventListener.java:196)
at org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:76)
at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:26)
at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1000)
at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:338)
at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:106)
at org.springframework.orm.hibernate3.HibernateTransactionManager.doCommit(HibernateTransactionManager.java:578)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:662)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:632)
at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:139)
at org.springframework.batch.execution.step.simple.SimpleStepExecutor$1.doInIteration(SimpleStepExecutor.java:208)
at org.springframework.batch.repeat.support.RepeatTemplate.getNextResult(RepeatTemplate.java:324)
at org.springframework.batch.repeat.support.RepeatTemplate.executeInternal(RepeatTemplate.java:201)
at org.springframework.batch.repeat.support.RepeatTemplate.iterate(RepeatTemplate.java:131)
at org.springframework.batch.execution.step.simple.SimpleStepExecutor.process(SimpleStepExecutor.java:185)
at org.springframework.batch.execution.job.DefaultJobExecutor.run(DefaultJobExecutor.java:97)
at org.springframework.batch.execution.launch.SimpleJobExecutorFacade.start(SimpleJobExecutorFacade.java:199)
at org.springframework.batch.execution.launch.SimpleJobLauncher.runInternal(SimpleJobLauncher.java:248)
at org.springframework.batch.execution.launch.SimpleJobLauncher$1.run(SimpleJobLauncher.java:292)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)