Yoann Rodière ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) *created* an issue Hibernate ORM ( https://hibernate.atlassian.net/browse/HHH?atlOrigin=eyJpIjoiNmE1MzQyZTUx... ) / Bug ( https://hibernate.atlassian.net/browse/HHH-15604?atlOrigin=eyJpIjoiNmE1Mz... ) HHH-15604 ( https://hibernate.atlassian.net/browse/HHH-15604?atlOrigin=eyJpIjoiNmE1Mz... ) Identically-named association in entity root and elementcollection of embeddables leads to assertion error ( https://hibernate.atlassian.net/browse/HHH-15604?atlOrigin=eyJpIjoiNmE1Mz... ) Issue Type: Bug Assignee: Unassigned Components: hibernate-core Created: 14/Oct/2022 06:09 AM Fix Versions: 6.2.0 Priority: Major Reporter: Yoann Rodière ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) Affects Hibernate ORM 6.2, probably also 6.1 and 6.0, but definitely not 5.6. This model: @Entity(name = "entityA") public static class EntityA { @Id private Integer id; @OneToOne(mappedBy = "identicallyNamedAssociation", fetch = FetchType.LAZY) private EntityB b; public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public EntityB getB() { return b; } public void setB(EntityB b) { this.b = b; } } @Entity(name = "entityB") public static class EntityB { @Id private Integer id; @OneToOne @JoinColumn(name = "entityA_id") private EntityA identicallyNamedAssociation; @ElementCollection @Embedded @OrderColumn(name = "idx") @CollectionTable(name = "elemcollect") private List<EmbeddableB> elementCollection = new ArrayList<>(); public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public EntityA getIdenticallyNamedAssociation() { return identicallyNamedAssociation; } public void setIdenticallyNamedAssociation(EntityA a) { this.identicallyNamedAssociation = a; } public List<EmbeddableB> getElementCollection() { return elementCollection; } } @Embeddable public static class EmbeddableB { @OneToOne @JoinColumn(name = "emb_entityA_id") private EntityA identicallyNamedAssociation; public EntityA getIdenticallyNamedAssociation() { return identicallyNamedAssociation; } public void setIdenticallyNamedAssociation(EntityA a) { this.identicallyNamedAssociation = a; } } Leads to this stack trace: java.lang.AssertionError at org.hibernate.metamodel.mapping.internal.ToOneAttributeMapping.withRegisteredAssociationKeys(ToOneAttributeMapping.java:1492) at org.hibernate.metamodel.mapping.internal.ToOneAttributeMapping.generateFetch(ToOneAttributeMapping.java:1232) at org.hibernate.metamodel.mapping.internal.ToOneAttributeMapping.generateFetch(ToOneAttributeMapping.java:106) at org.hibernate.sql.results.graph.FetchParent.generateFetchableFetch(FetchParent.java:105) at org.hibernate.loader.ast.internal.LoaderSelectBuilder.lambda$createFetchableBiConsumer$9(LoaderSelectBuilder.java:842) at org.hibernate.loader.ast.internal.LoaderSelectBuilder.lambda$visitFetches$8(LoaderSelectBuilder.java:681) at java.base/java.util.ArrayList.forEach(ArrayList.java:1541) at org.hibernate.metamodel.mapping.internal.EmbeddableMappingTypeImpl.visitAttributeMappings(EmbeddableMappingTypeImpl.java:726) at org.hibernate.metamodel.mapping.internal.EmbeddableMappingTypeImpl.visitSubParts(EmbeddableMappingTypeImpl.java:736) at org.hibernate.metamodel.mapping.internal.EmbeddedCollectionPart.visitSubParts(EmbeddedCollectionPart.java:286) at org.hibernate.sql.results.graph.FetchableContainer.visitFetchables(FetchableContainer.java:35) at org.hibernate.loader.ast.internal.LoaderSelectBuilder.visitFetches(LoaderSelectBuilder.java:680) at org.hibernate.loader.ast.internal.LoaderSqlAstCreationState.visitFetches(LoaderSqlAstCreationState.java:118) at org.hibernate.sql.results.graph.AbstractFetchParent.afterInitialize(AbstractFetchParent.java:32) at org.hibernate.sql.results.graph.embeddable.internal.EmbeddableFetchImpl.<init>(EmbeddableFetchImpl.java:75) at org.hibernate.metamodel.mapping.internal.EmbeddedCollectionPart.generateFetch(EmbeddedCollectionPart.java:162) at org.hibernate.sql.results.graph.FetchParent.generateFetchableFetch(FetchParent.java:105) at org.hibernate.collection.spi.InitializerProducerBuilder.createListInitializerProducer(InitializerProducerBuilder.java:153) at org.hibernate.collection.spi.InitializerProducerBuilder.createCollectionTypeWrapperInitializerProducer(InitializerProducerBuilder.java:255) at org.hibernate.collection.internal.CustomCollectionTypeSemantics.createInitializerProducer(CustomCollectionTypeSemantics.java:79) at org.hibernate.collection.spi.CollectionSemantics.createInitializerProducer(CollectionSemantics.java:94) at org.hibernate.sql.results.graph.collection.internal.CollectionDomainResult.<init>(CollectionDomainResult.java:64) at org.hibernate.metamodel.mapping.internal.PluralAttributeMappingImpl.createDomainResult(PluralAttributeMappingImpl.java:370) at org.hibernate.loader.ast.internal.LoaderSelectBuilder.generateSelect(LoaderSelectBuilder.java:450) at org.hibernate.loader.ast.internal.LoaderSelectBuilder.createSelect(LoaderSelectBuilder.java:177) at org.hibernate.loader.ast.internal.CollectionLoaderSingleKey.<init>(CollectionLoaderSingleKey.java:61) at org.hibernate.persister.collection.AbstractCollectionPersister.createCollectionLoader(AbstractCollectionPersister.java:869) at org.hibernate.persister.collection.AbstractCollectionPersister.postInstantiate(AbstractCollectionPersister.java:750) at java.base/java.util.concurrent.ConcurrentHashMap$ValuesView.forEach(ConcurrentHashMap.java:4772) at org.hibernate.metamodel.model.domain.internal.MappingMetamodelImpl.finishInitialization(MappingMetamodelImpl.java:240) at org.hibernate.metamodel.internal.RuntimeMetamodelsImpl.finishInitialization(RuntimeMetamodelsImpl.java:60) at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:309) at org.hibernate.boot.internal.SessionFactoryBuilderImpl.build(SessionFactoryBuilderImpl.java:415) at org.hibernate.testing.orm.junit.SessionFactoryExtension.lambda$createSessionFactoryScope$0(SessionFactoryExtension.java:151) ( https://hibernate.atlassian.net/browse/HHH-15604#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-15604#add-comment?atlOrigin=ey... ) Get Jira notifications on your phone! 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