Hibernate 3.2.CR2
MySQL 5.0 / InnoDB

A RescueCenter contains 0...* Pet objects. A Pet contains a note:String and data:PetData.

I'm at a lost of how to fix the mapping exception. Any help would be much appreciated!!


-------------- BEANS --------------
public class RescueCenter {
private Integer idRescueCenter;

// ArrayList of Pet objects
private ArrayList pets = new ArrayList();

public ArrayList getPets() {
return pets;
}
public void setPets( ArrayList pets ) {
this.pets = pets;
}
}

public class Pet {
private String note;
private PetData data;

public PetData getData() {
return data;
}
public void setData( PetData data ) {
this.data = data;
}
public String getNote() {
return note;
}
public void setNote( String note ) {
this.note = note;
}
}

public class PetData {
private Integer primaryKey;
private String breed;
...
}


-------------- MAPPING --------------
<class name="RescueCenter" table="rescue_center">
<id name="idRescueCenter">
<generator class="increment" />
</id>
<list name="pets" table="pets" >
<key column="idRescueCenter" />
<index column="position" />
<composite-element class="Pet" >
<property name="note" column="pet_note" />
<many-to-one name="data" class="PetData" column="idPetData" />
</composite-element>
</list>
</class>

<class name="PetData" table="pet_data" >
<id name="primaryKey" column="idPetData" >
<generator class="increment" />
</id>
<property name="breed" />
</class>


-------------- ERROR --------------
org.hibernate.PropertyAccessException: exception setting property value with CGLIB (set hibernate.cglib.use_reflection_optimizer=false for more info) setter of com.test.RescueCenter.setPets
at org.hibernate.tuple.PojoTuplizer.setPropertyValuesWithOptimizer(PojoTuplizer.java:197)
at org.hibernate.tuple.PojoTuplizer.setPropertyValues(PojoTuplizer.java:167)
at org.hibernate.persister.entity.BasicEntityPersister.setPropertyValues(BasicEntityPersister.java:2879)
at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:223)
at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:158)
at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:107)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:184)
at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:33)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:173)
at org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:27)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:69)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:429)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:424)
at com._70stylebox.Driver.save(Driver.java:54)
at com._70stylebox.Driver.main(Driver.java:45)
Caused by: net.sf.cglib.beans.BulkBeanException: org.hibernate.collection.PersistentList
at com._70stylebox.RescueCenter$$BulkBeanByCGLIB$$1b6c3227.setPropertyValues(<generated>)
at org.hibernate.tuple.PojoTuplizer.setPropertyValuesWithOptimizer(PojoTuplizer.java:194)
... 14 more
Caused by: java.lang.ClassCastException: org.hibernate.collection.PersistentList
... 16 more

When you see that exception, the first thing to do is to follow its advice.
I'm a very helpful person, so I'll (very helpfully, IMHO ;) point out the very helpful part of that message:
set hibernate.cglib.use_reflection_optimizer=false for more info

Actually, I'm not sure how it gets that far, seeing as you've got a <list> without a <list-index>. I didn't know that that was possible. Chances are, the exception is a side effect of the bad mapping.

Always use collection interfaces List, Set, etc in your get/set methods. So modify the above code to

public List getPets() {
return pets;
}
public void setPets( List pets ) {
this.pets = pets;
}

If you look at your stack trace you see also this error:

Caused by: java.lang.ClassCastException: org.hibernate.collection.PersistentList

Well prolly hibernate wants to set his PersistenList object in your ArrayList which won't work.
As Jaws said you should best use List or even the Collection interface if sorting isn't required. If possible always use interfaces that goes for everything in java imho.

tenwit: I read the exception, but choose to ignore it ;D I did the same exact mapping at work and no exceptions were thrown so I figured I could replicate it at home with the same results. Of course, I was doing it all from memory, and the table names were different (same structure). I figured I must of messed something up. Thus, the post.

As far as the <index> vice <list-index>, all the examples in 'Hibernate in Action' show <index column... /> (for ex. pg 231).


Jayeshj: As soon as I read your post, I wanted to slap myself. That did the trick. All is well...more questions to follow.


Much thanks to all that responded!