I'd like help with this obscure error. I have solved it, but am not sure why the error occurred - I'm also sure that hibernate should give a more meaningful error in this case anyway!
The solution is documented as a second post to this one.
Thanks in advance.
Hibernate version:
3.0.5
Mapping documents:
I'm not including all (they're huge) but see below for relevent snippets (generated using xdoclet):
Employees object:
Code:
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="Employees" table="PS_EMPLOYEES">
<id name="emplid" column="EMPLID" type="java.lang.String">
<generator class="assigned"/>
</id>
<snip>
<one-to-one
name="access"
class="Access"
cascade="save-update"
fetch="join"
property-ref="employee"
lazy="true"/>
<snip>
</hibernate-mapping>
Access object:Code:
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="Access" table="PS_ACCESS">
<id name="emplid" column="EMPLID">
<generator class="assigned"/>
</id>
<snip>
<many-to-one name="employee"
column="emplid"
not-null="true"
unique="true"
insert="false"
update="false"/>
<snip>
</hibernate-mapping>
Code between sessionFactory.openSession() and session.close():Again not a complete example, but what I am doing is:
Edit an employee object in a long-standing session used only for reading, never updating.
Merge that object into a newly created session as follows:
Code:
editSession = HibernateUtil.currentSession("EditHierarchyNode");
Transaction tx = editSession.beginTransaction();
Employees editEE = (Employees) editSession.merge(employee);
The error occurs on this line (merge) - see stack trace below.
Full stack trace of any exception that occurs:Exception occurred during event dispatching:
java.lang.ClassCastException: Employees$$EnhancerByCGLIB$$39ecb751
at org.hibernate.type.StringType.set(StringType.java:24)
at org.hibernate.type.NullableType.nullSafeSet(NullableType.java:62)
at org.hibernate.type.NullableType.nullSafeSet(NullableType.java:44)
at org.hibernate.loader.Loader.bindPositionalParameters(Loader.java:1115)
at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1177)
at org.hibernate.loader.Loader.doQuery(Loader.java:390)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:218)
at org.hibernate.loader.Loader.loadEntity(Loader.java:1345)
at org.hibernate.loader.entity.EntityLoader.load(EntityLoader.java:116)
at org.hibernate.loader.entity.EntityLoader.loadByUniqueKey(EntityLoader.java:106)
at org.hibernate.persister.entity.BasicEntityPersister.loadByUniqueKey(BasicEntityPersister.java:1333)
at org.hibernate.type.EntityType.loadByUniqueKey(EntityType.java:343)
at org.hibernate.type.EntityType.resolve(EntityType.java:289)
at org.hibernate.type.EntityType.replace(EntityType.java:197)
at org.hibernate.type.TypeFactory.replace(TypeFactory.java:385)
at org.hibernate.event.def.DefaultMergeEventListener.copyValues(DefaultMergeEventListener.java:239)
at org.hibernate.event.def.DefaultMergeEventListener.entityIsDetached(DefaultMergeEventListener.java:224)
at org.hibernate.event.def.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:102)
at org.hibernate.event.def.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:54)
at org.hibernate.impl.SessionImpl.merge(SessionImpl.java:535)
at org.hibernate.impl.SessionImpl.merge(SessionImpl.java:539)
at EditNodeDialog$RowWidgets.saveRow(EditNodeDialog.java:340)
at EditNodeDialog.actionPerformed(EditNodeDialog.java:194)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1849)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2169)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:234)
at java.awt.Component.processMouseEvent(Component.java:5488)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3126)
at java.awt.Component.processEvent(Component.java:5253)
at java.awt.Container.processEvent(Container.java:1966)
at java.awt.Component.dispatchEventImpl(Component.java:3955)
at java.awt.Container.dispatchEventImpl(Container.java:2024)
at java.awt.Component.dispatchEvent(Component.java:3803)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4212)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3892)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3822)
at java.awt.Container.dispatchEventImpl(Container.java:2010)
at java.awt.Window.dispatchEventImpl(Window.java:1774)
at java.awt.Component.dispatchEvent(Component.java:3803)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:153)
at java.awt.Dialog$1.run(Dialog.java:515)
at java.awt.Dialog.show(Dialog.java:536)
at java.awt.Component.show(Component.java:1300)
at java.awt.Component.setVisible(Component.java:1253)
at EditNodeDialog.createDialog(EditNodeDialog.java:172)
at HierarchyBuilder.makeEditDialog(HierarchyBuilder.java:277)
at HierarchyBuilder.access$2(HierarchyBuilder.java:273)
at HierarchyBuilder$2.mouseClicked(HierarchyBuilder.java:328)
at java.awt.AWTEventMulticaster.mouseClicked(AWTEventMulticaster.java:212)
at java.awt.Component.processMouseEvent(Component.java:5491)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3126)
at java.awt.Component.processEvent(Component.java:5253)
at java.awt.Container.processEvent(Container.java:1966)
at java.awt.Component.dispatchEventImpl(Component.java:3955)
at java.awt.Container.dispatchEventImpl(Container.java:2024)
at java.awt.Component.dispatchEvent(Component.java:3803)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4212)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3901)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3822)
at java.awt.Container.dispatchEventImpl(Container.java:2010)
at java.awt.Window.dispatchEventImpl(Window.java:1774)
at java.awt.Component.dispatchEvent(Component.java:3803)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)
Name and version of the database you are using:Oracle 9i with latest oracle classes12.jar.
The generated SQL (show_sql=true):Error occurs just after:
Code:
Hibernate: select access0_.EMPLID as EMPLID0_, access0_.emplid as emplid14_0_, access0_.P1_ADMIN as P13_14_0_, access0_.P2_ADMIN as P24_14_0_, access0_.P3_ADMIN as P35_14_0_, access0_.LAST_LOGIN_DATE as LAST6_14_0_, access0_.LAST_PW_CHANGE_DATE as LAST7_14_0_, access0_.P1_ESPS as P18_14_0_, access0_.P2_ESPS as P29_14_0_, access0_.P3_ESPS as P310_14_0_, access0_.USE_CONDITIONS_ACCEPTED as USE11_14_0_, access0_.P1_EMP as P112_14_0_, access0_.P2_EMP as P213_14_0_, access0_.P3_EMP as P314_14_0_ from db_name.PS_ACCESS access0_ where access0_.emplid=?
Debug level Hibernate log excerpt:
Information above.
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