| When a @ManyToOne relation is present on a composite key, Hibernate tries to persist that object even if no persist operation is done on the parent entity. This cause PersistentObjectException when an entity is retrieved from cache and Hibernate tries to persist its detached @ManyToOne key. For example:
@Entity
@IdClass(MyBeanId.class)
public class MyBean {
@Id
@ManyToOne
private MyOtherBean other;
@Id
private Long id;
}
A first query.getSingleResult() works, but all subsequent ones throw this:
Caused by: org.hibernate.PersistentObjectException: detached entity passed to persist: MyOtherBean
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:124)
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:58)
at org.hibernate.tuple.entity.AbstractEntityTuplizer$IncrediblySillyJpaMapsIdMappedIdentifierValueMarshaller.getIdentifier(AbstractEntityTuplizer.java:384)
at org.hibernate.tuple.entity.AbstractEntityTuplizer.getIdentifier(AbstractEntityTuplizer.java:219)
at org.hibernate.persister.entity.AbstractEntityPersister.getIdentifier(AbstractEntityPersister.java:4633)
at org.hibernate.persister.entity.AbstractEntityPersister.isTransient(AbstractEntityPersister.java:4344)
at org.hibernate.engine.internal.ForeignKeys.isTransient(ForeignKeys.java:226)
at org.hibernate.engine.internal.ForeignKeys.getEntityIdentifierIfNotUnsaved(ForeignKeys.java:276)
at org.hibernate.type.EntityType.getIdentifier(EntityType.java:455)
at org.hibernate.type.ManyToOneType.nullSafeSet(ManyToOneType.java:153)
at org.hibernate.param.NamedParameterSpecification.bind(NamedParameterSpecification.java:52)
at org.hibernate.loader.hql.QueryLoader.bindParameterValues(QueryLoader.java:627)
at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1943)
at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1896)
at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1874)
at org.hibernate.loader.Loader.doQuery(Loader.java:919)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:336)
at org.hibernate.loader.Loader.doList(Loader.java:2610)
at org.hibernate.loader.Loader.doList(Loader.java:2593)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2422)
at org.hibernate.loader.Loader.list(Loader.java:2417)
at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:501)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:371)
at org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:216)
at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1339)
at org.hibernate.internal.QueryImpl.list(QueryImpl.java:87)
at org.hibernate.jpa.internal.QueryImpl.list(QueryImpl.java:606)
at org.hibernate.jpa.internal.QueryImpl.getSingleResult(QueryImpl.java:529)
... 122 more
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