新启动线程时保存对象时报 错HibernateException: Illegal attempt to associate a collection with two open sessions

Exception in thread 
at org.hibernate.collection.internal.AbstractPersistentCollection.setCurrentSession(AbstractPersistentCollection.java:638)
at org.hibernate.event.internal.OnUpdateVisitor.processCollection(OnUpdateVisitor.java:65)
at org.hibernate.event.internal.AbstractVisitor.processValue(AbstractVisitor.java:121)
at org.hibernate.event.internal.AbstractVisitor.processValue(AbstractVisitor.java:82)
at org.hibernate.event.internal.AbstractVisitor.processEntityPropertyValues(AbstractVisitor.java:76)
at org.hibernate.event.internal.AbstractVisitor.process(AbstractVisitor.java:143)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.performUpdate(DefaultSaveOrUpdateEventListener.java:302)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsDetached(DefaultSaveOrUpdateEventListener.java:239)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:109)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:90)
at org.hibernate.internal.SessionImpl.fireSaveOrUpdate(SessionImpl.java:734)
at org.hibernate.internal.SessionImpl.saveOrUpdate(SessionImpl.java:726)
at org.hibernate.internal.SessionImpl.saveOrUpdate(SessionImpl.java:722)
at qnit.modules.base.dao.BaseDao.save(BaseDao.java:273)
at qnit.modules.advertise.service.AdvertisementService.save(AdvertisementService.java:146)
at qnit.modules.advertise.service.AdvertisementService$$FastClassBySpringCGLIB$$5998c9fd.invoke(<generated>)
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:711)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:98)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:262)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:95)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:644)
at qnit.modules.advertise.service.AdvertisementService$$EnhancerBySpringCGLIB$$3f8c59e7.save(<generated>)
at qnit.directive.AdSpaceDirective$1.run(AdSpaceDirective.java:82)
at java.lang.Thread.run(Thread.java:745)

当新启动线程时，报错