collection not getting filtered to requested subclasses ------------------------------------------------------- Key: HHH-2126 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2126 Project: Hibernate3 Type: Bug Components: core Versions: 3.2.0.cr4 Reporter: Patrick Moore ========================= The setup ========================= I have a class that has two maps defined in it to access MessageEndPointImpl instances. MessageEndPointImpl and MessageSourcePointImpl are subclasses stored in the same table. The first map accesses MessageEndPointImpls by their database ids: <map name="messageEndPointsByEntityKey" inverse="true" access="field" cascade="all-delete-orphan"> <key column="BROADCAST_PROVIDER" not-null="true"/> <map-key type="long" column="ID" /> <one-to-many class="com.transparentpolitics.core.messagehandling.MessageEndPointImpl"/> </map> The second map is to access MessageEndPointImpls by their lookup key which only some MessageEndPointImpls have: <map name="messageEndPointsByLookupKey" inverse="true" access="field" where="LOOKUPKEY IS NOT NULL"> <key column="BROADCAST_PROVIDER" not-null="true"/> <map-key type="string" column="LOOKUPKEY" /> <one-to-many class="com.transparentpolitics.core.messagehandling.MessageEndPointImpl"/> </map> ======================= The problem ======================= Trying to access the MessageEndPointImpls using the second map results in this exception. It is trying to include in the returned collection, the MessageSourcePointImpls. This is clearly wrong because the map definition specifies a one-to-many mapping with MessageEndPointImpl org.hibernate.WrongClassException: Object with id: 1 was not of the specified subclass: com.transparentpolitics.core.messagehandling.MessageEndPointImpl (loaded object was of wrong class class com.transparentpolitics.core.messagehandling.MessageSourcePointImpl) at org.hibernate.loader.Loader.instanceAlreadyLoaded(Loader.java:1234) at org.hibernate.loader.Loader.getRow(Loader.java:1186) at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:568) at org.hibernate.loader.Loader.doQuery(Loader.java:689) at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:224) at org.hibernate.loader.Loader.loadCollection(Loader.java:1918) at org.hibernate.loader.collection.CollectionLoader.initialize(CollectionLoader.java:36) at org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:565) at org.hibernate.event.def.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:60) at org.hibernate.impl.SessionImpl.initializeCollection(SessionImpl.java:1716) at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:344) at org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:86) at org.hibernate.collection.PersistentMap.values(PersistentMap.java:196) at com.transparentpolitics.core.BroadcastProvider.getMessageEndPointSet(BroadcastProvider.java:425) at com.transparentpolitics.core.BroadcastProvider.getMessageEndPointsMonitoringTopics(BroadcastProvider.java:491) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.hibernate.proxy.pojo.cglib.CGLIBLazyInitializer.invoke(CGLIBLazyInitializer.java:185) at com.transparentpolitics.core.BroadcastProvider$$EnhancerByCGLIB$$f7a6748d.getMessageEndPointsMonitoringTopics(<generated>) ============================== Workaround: ============================== changing the map definition to explicitly filter on the discriminator-value for MessageEndPointImpl works. <map name="messageEndPointsByLookupKey" inverse="true" access="field" where="LOOKUPKEY IS NOT NULL AND POINT_TYPE='MEP'"> <key column="BROADCAST_PROVIDER" not-null="true"/> <map-key type="string" column="LOOKUPKEY" /> <one-to-many class="com.transparentpolitics.core.messagehandling.MessageEndPointImpl"/> </map> -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://opensource.atlassian.com/projects/hibernate/secure/Administrators.... - For more information on JIRA, see: http://www.atlassian.com/software/jira