I have a class MyClass that has a subclass MySubclass,
and one instance of MyClass in the database with id=1.
Besides, there is a class MyRefClass that references
MyClass (many-to-one).
When I try to replicate an instance of MyRefClass from
XML into the database that references the existing instance of MyClass,
I get the following error:
Code:
Exception in thread "main" org.hibernate.HibernateException: instance not of expected entity type: MyClass
at org.hibernate.persister.entity.AbstractEntityPersister.getSubclassEntityPersister(AbstractEntityPersister.java:3301)
at org.hibernate.impl.SessionImpl.getEntityPersister(SessionImpl.java:1311)
at org.hibernate.engine.ForeignKeys.isTransient(ForeignKeys.java:180)
at org.hibernate.engine.ForeignKeys$Nullifier.isNullifiable(ForeignKeys.java:137)
at org.hibernate.engine.ForeignKeys$Nullifier.nullifyTransientReferences(ForeignKeys.java:69)
at org.hibernate.engine.ForeignKeys$Nullifier.nullifyTransientReferences(ForeignKeys.java:47)
at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:263)
at org.hibernate.event.def.DefaultReplicateEventListener.onReplicate(DefaultReplicateEventListener.java:117)
at org.hibernate.impl.SessionImpl.fireReplicate(SessionImpl.java:916)
at org.hibernate.impl.SessionImpl.replicate(SessionImpl.java:903)
at Main.hibtest(Main.java:90)
at Main.main(Main.java:30)
The method getSubclassEntityPersister() does not seem to work
here - I also doubt if the "TODO" in the code would help, because
the "instance" passed is a Long (i.e., the identifier of MyClass).
Is this a bug? Does anyone know a workaround? I found
http://opensource.atlassian.com/project ... se/HHH-422but am not sure if this is about the same thing, and besides it
only refers to 3.0.
The XML File:
Code:
<?xml version="1.0" encoding="UTF-8"?>
<MyRefClass>
<id>1</id>
<myClass>1</myClass>
</MyRefClass>
Hibernate version: 3.1.3
Mapping documents:MyClass.hbm.xml:
Code:
<hibernate-mapping>
<class name="MyClass" table="MyClass">
<id name="id" column="id" type="long">
<generator class="native"/>
</id>
<discriminator column="discrim" type="string"/>
<subclass name="MySubclass" discriminator-value="MySubclass"/>
</class>
</hibernate-mapping>
MyRefClass.hbm.xml:
Code:
<hibernate-mapping>
<class name="MyRefClass" table="MyRefClass" node="MyRefClass">
<id name="id" column="id" type="long">
<generator class="native"/>
</id>
<many-to-one name="myClass" column="myClassId" embed-xml="false"/>
</class>
</hibernate-mapping>
Code between sessionFactory.openSession() and session.close():Code:
Transaction tx = hibernateSession.beginTransaction();
Session dom4jsession = hibernateSession.getSession(EntityMode.DOM4J);
SAXReader reader = new SAXReader();
Document document = null;
try {
document = reader.read(new FileReader("/tmp/ttt.xml"));
} catch (Exception e) {
System.out.println("Error reading xml");
System.exit(0);
}
Element el = (Element)document.selectSingleNode("MyRefClass");
dom4jsession.replicate(el,ReplicationMode.OVERWRITE);
tx.commit();
Name and version of the database you are using: MySQL 5
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