Hi,
I afraid I am having problems loading an entity which one-to-many relationship and is composite keyed.
I deliberately map one property in the composite key object just to simplify the example.
After some debugging, it seems that at org.hibernate.property.DirectPropertyAccessor$DirectGetter.get(DirectPropertyAccessor.java:34):
Quote:
field.get(target)
where field is
parentCode (property in composite-id), and target is the value of
parentName (property-ref in the one-to-many relationship, a String), and hence the
IllegalArgumentException.
Wondering if there is a work around?
Many thanks in advanced.
Hibernate version:
3.0.5 / 3.1beta2
Mapping documents:
Code:
<class name="spikes.entities.Parent" table="parent" >
<!-- If compsite-id element is replaced normal key, it works perfectly fine.-->
<!--
<id name="parentCode" access="field">
<generator class="assigned"/>
</id>
-->
<composite-id name="compId" access="field" class="spikes.entities.ParentCompositeId">
<key-property name="parentCode" length="8" access="field"/>
</composite-id>
<property name="parentName" length="100" access="field"/>
<set name="children" inverse="true" access="field" cascade="all" >
<key column="parent_name" property-ref="parentName"/>
<one-to-many class="spikes.entities.Child"/>
</set>
</class>
Code:
<class name="spikes.entities.Child" table="child">
<id name="childId" access="field">
<generator class="native"/>
</id>
<many-to-one name="parent" column="parent_name" property-ref="parentName" access="field" />
</class>
Code between sessionFactory.openSession() and session.close():Code:
public void testLoadParent() {
Parent parent = new Parent("Code: "+RandomStringUtils.randomAlphanumeric(3), "Name: "+RandomStringUtils.randomAlphanumeric(10));
// setting up bidirectional relationship below.
parent.addChild(new Child());
Serializable parentId = getHibernateTemplate().save(parent);
getHibernateTemplate().flush();
getHibernateTemplate().clear();
Parent loadedParent = (Parent) getHibernateTemplate().load(Parent.class, parentId);
// exception happens below when children are loaded
assertFalse("not empty", loadedParent.getChildren().isEmpty());
}
Full stack trace of any exception that occurs:Code:
org.hibernate.PropertyAccessException: could not get a field value by reflection getter of spikes.entities.ParentCompositeId.parentCode
at org.hibernate.property.DirectPropertyAccessor$DirectGetter.get(DirectPropertyAccessor.java:34)
at org.hibernate.tuple.AbstractComponentTuplizer.getPropertyValue(AbstractComponentTuplizer.java:61)
at org.hibernate.tuple.AbstractComponentTuplizer.getPropertyValues(AbstractComponentTuplizer.java:67)
at org.hibernate.tuple.PojoComponentTuplizer.getPropertyValues(PojoComponentTuplizer.java:50)
at org.hibernate.type.ComponentType.getPropertyValues(ComponentType.java:257)
at org.hibernate.type.ComponentType.getHashCode(ComponentType.java:158)
at org.hibernate.engine.EntityKey.getHashCode(EntityKey.java:68)
at org.hibernate.engine.EntityKey.<init>(EntityKey.java:41)
at org.hibernate.engine.PersistenceContext.getCollectionOwner(PersistenceContext.java:674)
at org.hibernate.loader.Loader.readCollectionElement(Loader.java:660)
at org.hibernate.loader.Loader.readCollectionElements(Loader.java:370)
at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:314)
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.PersistentSet.isEmpty(PersistentSet.java:118)
at spikes.entities.ParentHibernateLookupIntegrationTest.testLoadParent(ParentHibernateLookupIntegrationTest.java:20)
Caused by: java.lang.IllegalArgumentException
at sun.reflect.UnsafeFieldAccessorImpl.ensureObj(UnsafeFieldAccessorImpl.java:37)
at sun.reflect.UnsafeObjectFieldAccessorImpl.get(UnsafeObjectFieldAccessorImpl.java:18)
at java.lang.reflect.Field.get(Field.java:228)
at org.hibernate.property.DirectPropertyAccessor$DirectGetter.get(DirectPropertyAccessor.java:31)
... 45 more
Name and version of the database you are using:
hsqldb
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