Working on a web application built on Spring 3.1.2.RELEASE, Hibernate Core 4.1.6.Final, Hibernate search 4.1.1.Final, Hibernate validator 4.3.0.Final, Aspectjrt 1.6.2.

Started getting this error on a ManyToMany relation after upgraded the Hibernate libraries to 4.1.6.Final from 3.6.3.Final. I came across some people suggesting to revert back to earlier versions of Hibernate. That solution doesn't work for me.


public class List.... {
@ManyToMany(fetch = FetchType.EAGER)
@JoinTable(name="LIST_ITEMS",
joinColumns = @JoinColumn(name="LIST_ID"),
inverseJoinColumns=@JoinColumn(name="ITEM_ID"))
@Cascade({org.hibernate.annotations.CascadeType.ALL})
@Sort(type = SortType.NATURAL) @Cache(usage=CacheConcurrencyStrategy.READ_WRITE)
@DisplayableCollection(displayName="Items")
@IndexedEmbedded
private Set<Item> listItems= new TreeSet<Item>();
}

public class Item.. {
@ManyToMany(mappedBy = "listItems", fetch = FetchType.LAZY) @LazyField(useApplicationLazyLoad = false)
private Set<List> lists= new HashSet<List>();
}


The error occurs when I try to add an Item that is already added to another List, to a New List and try to save the New List.
List1:Item1
List2:Item1

Stacktrace:

org.springframework.dao.InvalidDataAccessApiUsageException: An entity copy was already assigned to a different entity.; nested exception is java.lang.IllegalStateException: An entity copy was already assigned to a different entity.
at org.springframework.orm.jpa.EntityManagerFactoryUtils.convertJpaAccessExceptionIfPossible(EntityManagerFactoryUtils.java:298)
at org.springframework.orm.jpa.aspectj.JpaExceptionTranslatorAspect.ajc$afterThrowing$org_springframework_orm_jpa_aspectj_JpaExceptionTranslatorAspect$1$18a1ac9(JpaExceptionTranslatorAspect.aj:15)
at xx.xx.xx.dao.jpa.JPA.merge(GenericJpaDao.java:105)
at xx.xx.xx.model.AbsPerEnt.merge_aroundBody38(AbsPerEnt.java:311)
at xx.xx.xx.model.AbsPerEnt$AjcClosure39.run(AbsPerEnt.java:1)
at org.aspectj.runtime.reflect.JoinPointImpl.proceed(JoinPointImpl.java:101)
at xx.xx.xx.aspect.ApplicationContextInjectorAspect.callInstanceCrudMethod(ApplicationContextInjectorAspect.java:51)
at xx.xx.xx.model.AbsPerEnt.merge(AbsPerEnt.java:31)
at xx.xx.xx.model.AbsPerEnt.merge_aroundBody6(AbsPerEnt.java:14)
at xx.xx.xx.model.AbsPerEnt$AjcClosure7.run(AbsPerEnt.java:1)
at org.aspectj.runtime.reflect.JoinPointImpl.proceed(JoinPointImpl.java:101)
at xx.xx.xx.aspect.ApplicationContextInjectorAspect.callInstanceCrudMethod(ApplicationContextInjectorAspect.java:51)
at xx.xx.xx.model.AbsPerEnt.merge(AbsPerEnt.java:14)
at xx.xx.xx.model.AbsPerEnt.persistOrUpdate(AbsPerEnt.java:19)
at xx.xx.xx.web.AbsBackBean.save(AbsBackBean.java:81)
at xx.xx.xx.web.AbsBackBean.saveObject(AbsBackBean.java:77)
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:597)
at org.jboss.seam.util.Reflections.invoke(Reflections.java:22)
at org.jboss.seam.intercept.RootInvocationContext.proceed(RootInvocationContext.java:32)
at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:56)
at org.jboss.seam.transaction.RollbackInterceptor.aroundInvoke(RollbackInterceptor.java:28)
at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
at org.jboss.seam.core.BijectionInterceptor.aroundInvoke(BijectionInterceptor.java:77)
at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
at org.jboss.seam.core.MethodContextInterceptor.aroundInvoke(MethodContextInterceptor.java:44)
at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
at org.jboss.seam.core.SynchronizationInterceptor.aroundInvoke(SynchronizationInterceptor.java:32)
at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)

Caused by: java.lang.IllegalStateException: An entity copy was already assigned to a different entity.
at org.hibernate.event.internal.EventCache.put(EventCache.java:184)
at org.hibernate.event.internal.DefaultMergeEventListener.entityIsDetached(DefaultMergeEventListener.java:285)
at org.hibernate.event.internal.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:151)
at org.hibernate.internal.SessionImpl.fireMerge(SessionImpl.java:914)
at org.hibernate.internal.SessionImpl.merge(SessionImpl.java:896)
at org.hibernate.engine.spi.CascadingAction$6.cascade(CascadingAction.java:288)
at org.hibernate.engine.internal.Cascade.cascadeToOne(Cascade.java:380)
at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:323)
at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:208)
at org.hibernate.engine.internal.Cascade.cascadeCollectionElements(Cascade.java:409)
at org.hibernate.engine.internal.Cascade.cascadeCollection(Cascade.java:350)
at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:326)
at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:208)
at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:165)
at org.hibernate.event.internal.DefaultMergeEventListener.cascadeOnMerge(DefaultMergeEventListener.java:439)
at org.hibernate.event.internal.DefaultMergeEventListener.entityIsDetached(DefaultMergeEventListener.java:308)
at org.hibernate.event.internal.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:151)
at org.hibernate.internal.SessionImpl.fireMerge(SessionImpl.java:914)
at org.hibernate.internal.SessionImpl.merge(SessionImpl.java:896)
at org.hibernate.engine.spi.CascadingAction$6.cascade(CascadingAction.java:288)
at org.hibernate.engine.internal.Cascade.cascadeToOne(Cascade.java:380)
at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:323)
at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:208)
at org.hibernate.engine.internal.Cascade.cascadeCollectionElements(Cascade.java:409)
at org.hibernate.engine.internal.Cascade.cascadeCollection(Cascade.java:350)
at org.hibernate.engine.internal.Cascade.cascadeAssociation(Cascade.java:326)
at org.hibernate.engine.internal.Cascade.cascadeProperty(Cascade.java:208)
at org.hibernate.engine.internal.Cascade.cascade(Cascade.java:165)
at org.hibernate.event.internal.DefaultMergeEventListener.cascadeOnMerge(DefaultMergeEventListener.java:439)
at org.hibernate.event.internal.DefaultMergeEventListener.entityIsDetached(DefaultMergeEventListener.java:308)
at org.hibernate.event.internal.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:151)
at org.hibernate.event.internal.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:76)
at org.hibernate.internal.SessionImpl.fireMerge(SessionImpl.java:904)
at org.hibernate.internal.SessionImpl.merge(SessionImpl.java:888)
at org.hibernate.internal.SessionImpl.merge(SessionImpl.java:892)