Custom PropertyAccessor / illegal access to loading collection
--------------------------------------------------------------

          Key: HHH-5014
          URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-5014
        Project: Hibernate Core
      Issue Type: Bug
      Components: core
  Affects Versions: 3.3.2
     Environment: Hibernate 3.3.2 GA, HSQLDB 2.0.0-rc8
       Reporter: Stephan Sann


I posted the problem on the Hibernate-forum (https://forum.hibernate.org/viewtopic.php?f=1&t=1003277) and got no answer. So I assume this is a bug.

I wrote a custom PropertyAccessor
{code}
public class MyPropertyAccessor implements PropertyAccessor{code}

with this code within the set-Method of the Setter:
{code}
    public void set(Object target, Object value, SessionFactoryImplementor factory) throws HibernateException {
       try {

          if (((List) value) == null) {
            return;
          }

          List tempList = new ArrayList();
          tempList.addAll((List) value);

          // ... more code here{code}


What I get during runtime is a "LazyInitializationException: illegal access to loading collection" (Stacktrace see below.).

IMHO Hibernate shouldn't give me an uninitialized value (AbstractPersistentCollection) into the set-method of the PropertyAccessor!? (Hibernate should assume that I want to do something with the collection before setting it to the entity!)

If I don't got the concept of a PropertyAccessor completely wrong, the "set"-flow should work like this:

1.) (Hibernate-Core) Load the data from Database (completely*), transform it to a value of the matching type (e.g. List) and hand it over to the PropertyAccessor.
2.) (PropertyAccessor) Receive the (completely*) loaded and transformed value, do whatever modification is necessary and set the result to the entity.

completely*: In case of FetchType.EAGER: Completely loaded / in case of FetchType.LAZY: "Ready to access".

Correct me if I got something wrong here.

BTW: The corresponding List-property of the entity is FetchType.EAGER:
{code}
  @OneToMany (fetch = FetchType.EAGER)
  @Cascade ({CascadeType.ALL})
  @JoinColumn(name="ParentId")
  @IndexColumn(name="ParentIndex")
  @AccessType(value="path.to.MyPropertyAccessor")
  private List<Foo> fooList;{code}

(and the Hibernate-session should also be alive at the moment of the Exception)


The stacktrace:
org.hibernate.LazyInitializationException: illegal access to loading collection
at org.hibernate.collection.AbstractPersistentCollection.initialize (AbstractPersistentCollection.java:363)
at org.hibernate.collection.AbstractPersistentCollection.read (AbstractPersistentCollection.java:108)
at org.hibernate.collection.PersistentList.toArray (PersistentList.java:146)
at java.util.ArrayList.addAll (ArrayList.java:472)
at path.to.MyPropertyAccessor$BasicSetter.set(MyPropertyAccessor.java:71)
at org.hibernate.tuple.entity.AbstractEntityTuplizer.setPropertyValues (AbstractEntityTuplizer.java:352)
at org.hibernate.tuple.entity.PojoEntityTuplizer.setPropertyValues (PojoEntityTuplizer.java:232)
at org.hibernate.persister.entity.AbstractEntityPersister.setPropertyValues (AbstractEntityPersister.java:3580)
at org.hibernate.engine.TwoPhaseLoad.initializeEntity (TwoPhaseLoad.java:152)
at org.hibernate.loader.Loader.initializeEntitiesAndCollections (Loader.java:877)
at org.hibernate.loader.Loader.doQuery (Loader.java:752)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections (Loader.java:259)
at org.hibernate.loader.Loader.loadEntity (Loader.java:1885)
at org.hibernate.loader.entity.AbstractEntityLoader.load (AbstractEntityLoader.java:71)
at org.hibernate.loader.entity.AbstractEntityLoader.load (AbstractEntityLoader.java:65)
at org.hibernate.persister.entity.AbstractEntityPersister.load (AbstractEntityPersister.java:3062)
at org.hibernate.event.def.DefaultLoadEventListener.loadFromDatasource (DefaultLoadEventListener.java:434)
at org.hibernate.event.def.DefaultLoadEventListener.doLoad (DefaultLoadEventListener.java:415)
at org.hibernate.event.def.DefaultLoadEventListener.load (DefaultLoadEventListener.java:165)
at org.hibernate.event.def.DefaultLoadEventListener.proxyOrLoad (DefaultLoadEventListener.java:223)
at org.hibernate.event.def.DefaultLoadEventListener.onLoad (DefaultLoadEventListener.java:126)
at org.hibernate.impl.SessionImpl.fireLoad (SessionImpl.java:906)
at org.hibernate.impl.SessionImpl.get (SessionImpl.java:843)
at org.hibernate.impl.SessionImpl.get (SessionImpl.java:836)
at org.springframework.orm.hibernate3.HibernateTemplate$1.doInHibernate(HibernateTemplate.java:519)
at org.springframework.orm.hibernate3.HibernateTemplate.doExecute (HibernateTemplate.java:406)
at org.springframework.orm.hibernate3.HibernateTemplate.executeWithNativeSession (HibernateTemplate.java:374)
at org.springframework.orm.hibernate3.HibernateTemplate.get (HibernateTemplate.java:512)
at org.springframework.orm.hibernate3.HibernateTemplate.get (HibernateTemplate.java:506)
// some more...


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