Hi, A one-to-many association is causing Hibernate to throw the following exception when loading an entity via Session.get(domainClass, identifier), under the following conditions:
1. the association collection is annotated with @Fetch(FetchMode.JOIN) 2. the association's join column is referencing a non-primary key of the owning entity 3. the association's join column value is referencing a non-existing record of the associated table (the "many" side). Caused by: org.hibernate.property.access.spi.PropertyAccessException: Error accessing field [protected java.lang.Long ...] by reflection for persistent property [...] : 1GBE4E1E04 at org.hibernate.property.access.spi.GetterFieldImpl.get(GetterFieldImpl.java:43) at org.hibernate.tuple.component.AbstractComponentTuplizer.getPropertyValue(AbstractComponentTuplizer.java:58) at org.hibernate.type.ComponentType.getPropertyValue(ComponentType.java:419) at org.hibernate.type.ComponentType.getHashCode(ComponentType.java:242) at org.hibernate.engine.spi.CollectionKey.generateHashCode(CollectionKey.java:64) at org.hibernate.engine.spi.CollectionKey.<init>(CollectionKey.java:58) at org.hibernate.engine.spi.CollectionKey.<init>(CollectionKey.java:43) at org.hibernate.engine.loading.internal.CollectionLoadContext.getLoadingCollection(CollectionLoadContext.java:95) at org.hibernate.loader.plan.exec.process.internal.CollectionReferenceInitializerImpl.finishUpRow(CollectionReferenceInitializerImpl.java:105) at org.hibernate.loader.plan.exec.process.internal.AbstractRowReader.readRow(AbstractRowReader.java:121) at org.hibernate.loader.plan.exec.internal.EntityLoadQueryDetails$EntityLoaderRowReader.readRow(EntityLoadQueryDetails.java:239) at org.hibernate.loader.plan.exec.process.internal.ResultSetProcessorImpl.extractResults(ResultSetProcessorImpl.java:122) at org.hibernate.loader.plan.exec.internal.AbstractLoadPlanBasedLoader.executeLoad(AbstractLoadPlanBasedLoader.java:122) at org.hibernate.loader.plan.exec.internal.AbstractLoadPlanBasedLoader.executeLoad(AbstractLoadPlanBasedLoader.java:86) at org.hibernate.loader.entity.plan.AbstractLoadPlanBasedEntityLoader.load(AbstractLoadPlanBasedEntityLoader.java:167) at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:3967) at org.hibernate.event.internal.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:508) at org.hibernate.event.internal.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:478) at org.hibernate.event.internal.DefaultLoadEventListener.load(DefaultLoadEventListener.java:219) at org.hibernate.event.internal.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:278) at org.hibernate.event.internal.DefaultLoadEventListener.doOnLoad(DefaultLoadEventListener.java:121) at org.hibernate.event.internal.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:89) at org.hibernate.internal.SessionImpl.fireLoad(SessionImpl.java:1129) at org.hibernate.internal.SessionImpl.access$2600(SessionImpl.java:164) at org.hibernate.internal.SessionImpl$IdentifierLoadAccessImpl.load(SessionImpl.java:2696) at org.hibernate.internal.SessionImpl.get(SessionImpl.java:975) ... Caused by: java.lang.IllegalArgumentException: Can not set ... to java.lang.String at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:164) at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:168) at sun.reflect.UnsafeFieldAccessorImpl.ensureObj(UnsafeFieldAccessorImpl.java:55) at sun.reflect.UnsafeObjectFieldAccessorImpl.get(UnsafeObjectFieldAccessorImpl.java:36) at java.lang.reflect.Field.get(Field.java:379) at org.hibernate.property.access.spi.GetterFieldImpl.get(GetterFieldImpl.java:39) ... 44 more The problem is that when initializing the collection, Hibernate is not able to retrieve the association key value in CollectionReferenceInitializerImpl.finishUpRow and will fall back to use the entity owner's primary key instead, causing the IllegalArgumentException. We have noticed that there is a related open issue: https://hibernate.atlassian.net/browse/HHH-9370 We have worked around this issue by changing the way optionalKey is retrieved in CollectionReferenceInitializerImpl.finishUpRow, foreignKeyPropertyName ); ResultSetProcessingContext.EntityReferenceProcessingState ownerState = context.getOwnerProcessingState( (Fetch) collectionReference ); Serializable optionalKey = collectionReference.getCollectionPersister().getCollectionType().getKeyOfOwner(ownerState.getEntityInstance(), context.getSession()); Although this seems to work for us, we would like to collaborate to have this fixed upstream, if you believe this is actually caused by a bug and not by using Hibernate associations in the wrong way. Thanks, Marcello _______________________________________________ hibernate-dev mailing list hibernate-dev@lists.jboss.org https://lists.jboss.org/mailman/listinfo/hibernate-dev
