[Hibernate] exception WrongClassException héritage subclass

**lilou77** · 19/01/2006, 09h37

Bonjour, voila je tombe sur une exceptio lorsque je réupère des données de la base.
En fait je sauvegarde la classe workspace qui contient une liste de Sensor.
Le sensor peuvent etre de plusieurs, type, voici le fichier XML de sensor :

Code :

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<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
 
<hibernate-mapping package="dsi.emc.pac7000.core.sensor">
 
        <class name="Sensor" table="SENSOR" discriminator-value="S">
                <id name="id" column="sensor_uid" type="long" unsaved-value="0">
                        <generator class="identity"/>
                </id>
                <discriminator column="SENSOR_TYPE" type="string"/>
 
                <property  name="name" column="NAME" type="string"/>
 
                <subclass name = "dsi.emc.pac7000.core.sensor.demo.DemoSensor" discriminator-value="DEMOSENSOR">
 	</subclass>
 
	<subclass name = "dsi.emc.pac7000.core.sensor.manual.ManualSensor" discriminator-value="MANUALSENSOR">
 	</subclass>
 
	<subclass name = "dsi.emc.pac7000.core.sensor.gagetalker.AbstractGage" discriminator-value="ABSTRACTGAGE">
	      <property name="nbMinValue" column="NB_MIN" type="int"/>
 
	      <subclass name = "dsi.emc.pac7000.core.sensor.gagetalker.DigitalGage" discriminator-value="DIGITALGAGE">
	      </subclass>
	      <subclass name = "dsi.emc.pac7000.core.sensor.gagetalker.AnalogGage" discriminator-value="ANALOGGAGE">
	      </subclass>
	      <subclass name = "dsi.emc.pac7000.core.sensor.gagetalker.Rs232Gage" discriminator-value="RS232GAGE">
	           <property  name="initialisation" column="INIT"	type="string"/>
	           <property  name="field" column="FIELD" type="int"/>
	           <bag  name="buffers" inverse="false" cascade="all-delete-orphan">
	               <key column="buffer_uid"/>
	               <one-to-many class="dsi.emc.pac7000.core.sensor.gagetalker.Rs232GageBuffer"/>
	          </bag>	  
	         <property  name="buffer" 			column="BUFFER"	type="string"/>
	     </subclass>
	</subclass>
        </class>
</hibernate-mapping>

voici l'extrait du fichier de mapping XML de la table WORKSPACE

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        <class name="WorkSpace" table="WORKSPACE" discriminator-value="W" lazy="false">
                <id name="id" column="work_uid" type="long" unsaved-value="0">
                        <generator class="identity"/>
                </id>
                <discriminator column="WORKSPACE_TYPE" type="string"/>
 
	<bag  name="gages" inverse="false" cascade="all" lazy="false">
	    <key column="workspace_uid"/>
	    <one-to-many class="dsi.emc.pac7000.core.sensor.Sensor"/>
	</bag>	  
 
	<subclass name = "DatabaseManager" discriminator-value="DATABASEMANAGER">
 	</subclass>
	<subclass name = "HardDisk" discriminator-value="HARDDISK">
	    <property  name="gageFileKey" column="GAGE_FILE_KEY" type="int"/>
	</subclass>
 
        </class>

Si mon workspace ne contient que des Manual ou Demo Sensor, il n'y a aucune erreur, mais un DigitalGage ne passe, voici l'erreur :

org.hibernate.PropertyAccessException: exception setting property value with CGLIB (set hibernate.cglib.use_reflection_optimizer=false for more info) setter of dsi.emc.pac7000.core.persistence.DatabaseManager.setGages
at org.hibernate.tuple.PojoTuplizer.setPropertyValuesWithOptimizer(PojoTuplizer.java:203)
at org.hibernate.tuple.PojoTuplizer.setPropertyValues(PojoTuplizer.java:173)
at org.hibernate.persister.entity.BasicEntityPersister.setPropertyValues(BasicEntityPersister.java:2919)
at org.hibernate.engine.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:113)
at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:530)
at org.hibernate.loader.Loader.doQuery(Loader.java:436)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:218)
at org.hibernate.loader.Loader.doList(Loader.java:1593)
at org.hibernate.loader.Loader.list(Loader.java:1577)
at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:395)
at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:271)
at org.hibernate.impl.SessionImpl.list(SessionImpl.java:844)
at org.hibernate.impl.QueryImpl.list(QueryImpl.java:74)
at dsi.emc.pac7000.core.persistence.DatabaseManager.getWorkSpace(DatabaseManager.java:343)
... 16 more
Caused by: org.hibernate.WrongClassException: Object with id: 1 was not of the specified subclass: dsi.emc.pac7000.core.sensor.gagetalker.AbstractGage (Discriminator: DEMOSENSOR)
at org.hibernate.loader.Loader.getInstanceClass(Loader.java:1046)
at org.hibernate.loader.Loader.instanceNotYetLoaded(Loader.java:924)
at org.hibernate.loader.Loader.getRow(Loader.java:855)
at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:305)
at org.hibernate.loader.Loader.doQuery(Loader.java:412)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:218)
at org.hibernate.loader.Loader.loadCollection(Loader.java:1434)
at org.hibernate.loader.collection.OneToManyLoader.initialize(OneToManyLoader.java:111)
at org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:488)
at org.hibernate.event.def.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:60)
at org.hibernate.impl.SessionImpl.initializeCollection(SessionImpl.java:1430)
at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:176)
at org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:48)
at org.hibernate.collection.PersistentBag.toString(PersistentBag.java:449)
at java.lang.String.valueOf(Unknown Source)
at java.lang.StringBuffer.append(Unknown Source)
at dsi.emc.pac7000.core.persistence.WorkSpace.setGages(WorkSpace.java:339)
... 18 more

et si on regarde la table SENSOR, voila le resultat.

sensor_uid....SENSOR_TYPE........ NAME.........workspace_uid
___________________________________________________
......1........... DEMOSENSOR ....Démonstration.....1
......2........... MANUALSENSOR...Clavier...............1
......3........... DIGITALGAGE.......... a...................1

si quelqu'un voit d'ou cela peut venir, j'ai vérifié mes classes, j'ai bien :
public class DemoSensor extends Sensor
public class ManualSensor extends Sensor
public abstract class AbstractGage extends Sensor
public class DigitalGage extends AbstractGage

donc je ne comprends pas d'ou cela peut venir.

MErci d'avance pour votre aide

**Pietra** · 19/01/2006, 11h24

Bonjour,

j'emets une hypothèse :
Hibernate ne sais pas gérer deux niveaux d'héritage (ta classe DigitalGage doit hériter directement de Sensor) ?

**lilou77** · 19/01/2006, 11h34

je pense qu'il peut gérer plusieurs niveaux d'héritage car dans le livre Hibernate3.0 il y a un exemple avec Superstar qui hérite de Player qui hérite lui même de Personn
et j'ai repris cette exemple pour réaliser mon mapping...

**lilou77** · 19/01/2006, 14h49

j'ai changé mon mapping en utilisant la statégie "une classe par sous classe"; apparement l'erreur a disparu.

Code :

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<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
 
<hibernate-mapping package="dsi.emc.pac7000.core.sensor">
 
        <class name="Sensor" table="SENSOR" discriminator-value="S">
                <id name="id" column="sensor_uid" type="long" unsaved-value="0">
                        <generator class="identity"/>
                </id>
 
                <property  name="name" column="NAME" type="string"/>
 
				<joined-subclass name = "dsi.emc.pac7000.core.sensor.demo.DemoSensor" table="DEMOSENSOR">
					<key column="DEMOSENSOR_ID"/>
 
				<joined-subclass name = "dsi.emc.pac7000.core.sensor.manual.ManualSensor" table="MANUALSENSOR">
					<key column="MANUALSENSOR_ID"/>
 				</joined-subclass>
 
				<joined-subclass name = "dsi.emc.pac7000.core.sensor.gagetalker.AbstractGage" table="ABSTRACTGAGE">
					<key column="ABSTRACTGAGE_ID"/>
	                <property  		name="nbMinValue" 	column="NB_MIN" 		type="int"/>
 
					<joined-subclass name = "dsi.emc.pac7000.core.sensor.gagetalker.DigitalGage" table="DIGITALGAGE">
						<key column="DIGITALGAGE_ID"/>
	 				</joined-subclass>
					<joined-subclass name = "dsi.emc.pac7000.core.sensor.gagetalker.AnalogGage" table="ANALOGGAGE">
						<key column="ANALOGGAGE_ID"/>
		                <property  name="typeAnalog" 	column="TYPE_ANALOG"	type="int"/>
	 				</joined-subclass>
					<joined-subclass name = "dsi.emc.pac7000.core.sensor.gagetalker.Rs232Gage" table="RS232GAGE">
						<key column="RS232GAGE_ID"/>
		                <property  name="search1" 			column="SEARCH_1"	type="string"/>
		                <property  name="search2" 			column="SEARCH_2"	type="string"/>
		                <property  name="field" 			column="FIELD" 		type="int"/>
						<bag  name="buffers" inverse="false" cascade="all-delete-orphan">
							<key column="buffer_uid"/>
							<one-to-many class="dsi.emc.pac7000.core.sensor.gagetalker.Rs232GageBuffer"/>
						</bag>	  
		                <property  name="buffer" 			column="BUFFER"	type="string"/>
	 				</joined-subclass>
 				</joined-subclass>
 
 
        </class>
</hibernate-mapping>

[Hibernate] exception WrongClassException héritage subclass

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