Session.refresh(object) sets session=null of child list

klemensl · **Joined:** Wed Dec 13, 2006 10:39 am **Posts:** 26

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Hibernate version: 3.2.2

Mapping documents:
parent:
<list
name="childRequirements"
lazy="extra"
inverse="true"
cascade="persist,evict,delete,replicate,lock,save-update"
>

<key column="parent_requirement_id"></key>

<index column="sequence"/>

<one-to-many class="com.seqis.kltm.model.db.project.Requirement"/>

</list>

child:
<many-to-one
name="parentRequirement"
class="com.seqis.kltm.model.db.project.Requirement"
cascade="none"
outer-join="auto"
update="true"
insert="true"
column="parent_requirement_id"
/>

Name and version of the database you are using: MySQL 5

Code:

//creating a parent
Requirement req = new Requirement("parent");
SessionFactory f = KLTMContext.getSessionFactory("test_hibernate");
Session s1 = f.openSession();
Transaction tx = s1.beginTransaction();
s1.saveOrUpdate(req);
tx.commit();
s1.close();

//adding a child   
s1 = f.openSession();
Requirement child = new Requirement("child");
Requirement req2 = (Requirement) s1.merge(req);
tx = s1.beginTransaction();
req2.addChildRequirement(child);
s1.saveOrUpdate(child);
tx.commit();
s1.close();
   
//loading the parent and refreshing parent and child   
s1 = f.openSession();
req = (Requirement) PersistentModel.narrow(s1.load(Requirement.class, new Long(req2.getObjectId())));
s1.refresh(req);
child = (Requirement) req.getChildRequirements().get(0);
s1.refresh(child);
.close();

after the child was refreshed, the child's child list has no session set.
anybody knows why?

TIA

batmat · **Posted:** Fri Mar 30, 2007 7:00 am

What do you mean byb the child's child's session is not set? Session is not associated to an entity. Entity has no knowledge that it's being managed by a session.

Maybe you could re-explain your issue?

klemensl · **Joined:** Wed Dec 13, 2006 10:39 am **Posts:** 26

Hello!
The child has also a list of childs (the child is a parent too, but the list is empty in this case).
After loading the parent and getting the child of the parents child list, the child has a org.hibernate.collections.persistentlist. this list has a property "session" which holds a SessionImpl Object (the session is open). After refreshing the child, the property "session" is null.
A strange thing is, that the childs PersistentList has the same JVM id before and after refreshing. The PersistentList of the parent is a new Object after refreshing (the JVM id changes).

lg

malkolinge · **Joined:** Mon Nov 13, 2006 4:55 am **Posts:** 3

lazy="false"

klemensl · **Joined:** Wed Dec 13, 2006 10:39 am **Posts:** 26

this lists will get very huge, so lazy="false" can not be the best solution.
lg

malkolinge · **Joined:** Mon Nov 13, 2006 4:55 am **Posts:** 3

it is the answer on your question. Probably, when you refresh container object, all included "lazy" elements becomes uninitialized. It is standart behaviour of lazy elements.

klemensl · **Joined:** Wed Dec 13, 2006 10:39 am **Posts:** 26

could you explain me then, why the parent and the child are acting different? both are objects from the same class, but the list of the parent has the session set after the refresh and the childs list has not.

i understand, that the list is uninitialized after a refresh because of lazy="true", but when it has no session set, how am i able to initialize it?