net.sf.hibernate.WrongClassException: Object with id: 1 was not of the specified subclass: ------------------------------------------------------------------------------------------- Key: HHH-3382 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3382 Project: Hibernate3 Issue Type: Bug Environment: hibernate 2.1.7 , mysql Reporter: cristian vargas Attachments: diagram.JPG i got this error in my project , please can anybody help me? i have an inheritance mapping , you can see the class diagrama in the attachment. i want to map the sell class, there are two references , one to the client class and the other one to the employment class. this is the mapping that i built <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD//EN" "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd"> <hibernate-mapping> <class name="Inventory.Sell" table="Sell"> <id name="Id_Sell" type="integer"> <column name="Id_Sell" /> <generator class="identity" /> </id> <property name="FechaPedido" type="date"> <column name="FechaPedido" /> </property> <many-to-one name="Id_Cliente" class="Inventory.Client" > <column name="Id_Cliente" not-null="false" /> </many-to-one> <many-to-one name="Id_Employment" class="Inventory.Employment" > <column name="Id_Employment" not-null="false" /> </many-to-one> </class> </hibernate-mapping> and this is the mapping for the inheritance <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD//EN" "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd"> <hibernate-mapping> <class name="Inventory.Person" table="person" > <id name="Id_Persona" type="integer"> <column name="Id_Persona" /> <generator class="identity" /> </id> <property name="CI" type="string"> <column name="CI" length="20" /> </property> <property name="nombre" type="string"> <column name="Nombre" length="100" /> </property> <property name="trabajoDir" type="string"> <column name="DireccionTrabajo" length="100" /> </property> <property name="DireccionDomicilio" type="string"> <column name="DireccionDomicilio" length="100" /> </property> <property name="Celular" type="string"> <column name="Celular" length="100" /> </property> <set name="emailAddresses" table="email"> <key column="Id_Email"/> <element type="string" column="Email"/> </set> <set name="telefono" table="telefono"> <key column="Id_Telefono"/> <element type="string" column="Telefono"/> </set> <set name="fax" table="fax"> <key column="Id_Fax"/> <element type="string" column="Fax"/> </set> <joined-subclass name="Inventory.Employment" table="employment"> <key column="Id_Empleado"/> <property name="Sueldo" type="string"> <column name="Sueldo" length="100" /> </property> <property name="Moneda" type="string"> <column name="Moneda" length="100" /> </property> <property name="FechaContrato" type="date"> <column name="FechaContrato" /> </property> </joined-subclass> <joined-subclass name="Inventory.Client" table="client"> <key column="Id_Cliente"/> </joined-subclass> </class> </hibernate-mapping> this is the error that i get: net.sf.hibernate.WrongClassException: Object with id: 1 was not of the specified subclass: ...................................... at net.sf.hibernate.loader.Loader.instanceAlreadyLoaded(Loader.java:531) at net.sf.hibernate.loader.Loader.getRow(Loader.java:498) at net.sf.hibernate.loader.Loader.getRowFromResultSet(Loader.java:213) at net.sf.hibernate.loader.Loader.doQuery(Loader.java:281) at net.sf.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:133) at net.sf.hibernate.loader.Loader.loadCollection(Loader.java:990) at net.sf.hibernate.loader.Loader.loadCollection(Loader.java:965) at net.sf.hibernate.loader.OneToManyLoader.initialize(OneToManyLoader.java:93) at net.sf.hibernate.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:288) at net.sf.hibernate.impl.SessionImpl.initializeCollection(SessionImpl.java:3303) at net.sf.hibernate.collection.PersistentCollection.forceInitialization(PersistentCollection.java:336) at net.sf.hibernate.impl.SessionImpl.initializeNonLazyCollections(SessionImpl.java:3156) at net.sf.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:138) at net.sf.hibernate.loader.Loader.doList(Loader.java:1033) at net.sf.hibernate.loader.Loader.list(Loader.java:1024) at net.sf.hibernate.hql.QueryTranslator.list(QueryTranslator.java:854) at net.sf.hibernate.impl.SessionImpl.find(SessionImpl.java:1553) at net.sf.hibernate.impl.SessionImpl.find(SessionImpl.java:1530) at net.sf.hibernate.impl.SessionImpl.find(SessionImpl.java:1522) at hibernate.conexion.consulta(conexion.java:177) at _Control__Acceso._jspService(_Control__Acceso.java:80) [/Control_Acceso.jsp] at com.orionserver[Oracle Containers for J2EE 10g (10.1.3.1.0) ].http.OrionHttpJspPage.service(OrionHttpJspPage.java:59) at oracle.jsp.runtimev2.JspPageTable.service(JspPageTable.java:453) at oracle.jsp.runtimev2.JspServlet.internalService(JspServlet.java:591) at oracle.jsp.runtimev2.JspServlet.service(JspServlet.java:515) at javax.servlet.http.HttpServlet.service(HttpServlet.java:856) at com.evermind[Oracle Containers for J2EE 10g (10.1.3.1.0) ].server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:711) at com.evermind[Oracle Containers for J2EE 10g (10.1.3.1.0) ].server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:368) at com.evermind[Oracle Containers for J2EE 10g (10.1.3.1.0) ].server.http.HttpRequestHandler.doProcessRequest(HttpRequestHandler.java:866) at com.evermind[Oracle Containers for J2EE 10g (10.1.3.1.0) ].server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:448) at com.evermind[Oracle Containers for J2EE 10g (10.1.3.1.0) ].server.http.HttpRequestHandler.serveOneRequest(HttpRequestHandler.java:216) at com.evermind[Oracle Containers for J2EE 10g (10.1.3.1.0) ].server.http.HttpRequestHandler.run(HttpRequestHandler.java:117) at com.evermind[Oracle Containers for J2EE 10g (10.1.3.1.0) ].server.http.HttpRequestHandler.run(HttpRequestHandler.java:110) at oracle.oc4j.network.ServerSocketReadHandler$SafeRunnable.run(ServerSocketReadHandler.java:260) at oracle.oc4j.network.ServerSocketAcceptHandler.procClientSocket(ServerSocketAcceptHandler.java:239) at oracle.oc4j.network.ServerSocketAcceptHandler.access$700(ServerSocketAcceptHandler.java:34) at oracle.oc4j.network.ServerSocketAcceptHandler$AcceptHandlerHorse.run(ServerSocketAcceptHandler.java:880) at com.evermind[Oracle Containers for J2EE 10g (10.1.3.1.0) ].util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:303) at java.lang.Thread.run(Thread.java:595) -- 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 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