Class Cast Exception

[James Dsouza]

Hi All,

I facing a problem with this mapping file.
Hibernate 3.2.3


<hibernate-mapping>
<class name="com.thbs.induction.bo.InductionTaskMap" table="induction_task_map">

<composite-id>
<key-property name="parentTaskId" type="integer"/>
<key-property name="childTaskId" type="integer"/><key-property name="sequence" type="integer"/>
</composite-id>

<property name="parentTaskId" type="integer" insert="false" update="false" access="field"/> =========> ( 1 )

<bag name="children" table="induction_task_map" order-by="sequence asc" lazy="false">
<key property-ref="parentTaskId" />
<one-to-many class="com.thbs.induction.bo.InductionTaskMap"/>
</bag>

</class>

<query name="InductionTaskMap.findByParentId">
<![CDATA[select taskMap from InductionTaskMap taskMap where taskMap.parentTaskId = ? ]]>
</query>

</hibernate-mapping>

Please have a look at the property tag at ( 1 ).
If I remove this I get a this exception

--------------------------------------
Caused by: org.hibernate.MappingException: Same physical column represented by different logical column names: induction_task_map.parent_task_id => 'parentTaskId' and 'parent_task_id'
at org.hibernate.cfg.Mappings.addColumnBinding(Mappings.java:464)
at org.hibernate.cfg.HbmBinder.bindColumns(HbmBinder.java:1075)
at org.hibernate.cfg.HbmBinder.bindColumnsOrFormula(HbmBinder.java:1518)
at org.hibernate.cfg.HbmBinder.bindSimpleValue(HbmBinder.java:1124)
at org.hibernate.cfg.HbmBinder.bindCollectionSecondPass(HbmBinder.java:2405)
at org.hibernate.cfg.HbmBinder$CollectionSecondPass.secondPass(HbmBinder.java:2652)
at org.hibernate.cfg.CollectionSecondPass.doSecondPass(CollectionSecondPass.java:43)
at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1130)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1286)
at org.springframework.orm.hibernate3.LocalSessionFactoryBean.newSessionFactory(LocalSessionFactoryBean.java:805)
at org.springframework.orm.hibernate3.LocalSessionFactoryBean.buildSessionFactory(LocalSessionFactoryBean.java:745)
----------------------

To solve the above problem I added a property-ref attribute to my collection.This solved my above problem with a new exception shown below

I am new to hibernate.Please help!!


Stacktrace
-------------
java.lang.ClassCastException: java.lang.Integer
at org.hibernate.type.ComponentType.toLoggableString(ComponentType.java:377)
at org.hibernate.pretty.MessageHelper.collectionInfoString(MessageHelper.java:284)
at org.hibernate.loader.Loader.loadCollection(Loader.java:2001)
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.forceInitialization(AbstractPersistentCollection.java:454)
at org.hibernate.engine.StatefulPersistenceContext.initializeNonLazyCollections(StatefulPersistenceContext.java:785)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:241)
at org.hibernate.loader.Loader.doList(Loader.java:2220)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2104)
at org.hibernate.loader.Loader.list(Loader.java:2099)
at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:378)
at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:338)
at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:172)
at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1121)
at org.hibernate.impl.QueryImpl.list(QueryImpl.java:79)
at com.thbs.induction.framework.dataaccess.hibernate.impl.GenericDaoHibernateImpl.executeFinder(GenericDaoHibernateImpl.java:144)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
-------------