Hibernate version:
2.1.3

Mapping documents:
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping
PUBLIC "-//Hibernate/Hibernate Mapping DTD 2.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">
<hibernate-mapping>
<class name = "escola.Turma" table = "turmas">
<id name = "id" column = "id" unsaved-value = "null">
<generator class = "increment" />
</id>
<property name = "obs" column = "obs" />
<property name = "autor" column = "autor" />
<property name = "ciclo" column = "ciclo" />
<property name = "leI" column = "leI" />
<property name = "leII" column = "leII" />
<property name = "q1" column = "q1" />
<property name = "q2" column = "q2" />
<property name = "q3" column = "q3" />
<property name = "q4" column = "q4" />
<property name = "q5" column = "q5" />
<property name = "q6" column = "q6" />
<property name = "q7" column = "q7" />
<property name = "q8" column = "q8" />
<property name = "q16" column = "q16" />
<property name = "q18" column = "q18" />
<property name = "q25" column = "q25" />
<property name = "q26" column = "q26" />
<property name = "q27" column = "q27" />
<property name = "q28" column = "q28" />
<property name = "q29" column = "q29" />
<property name = "q30" column = "q30" />
<property name = "q31" column = "q31" />
<property name = "q32" column = "q32" />
<property name = "q33_1" column = "q33_1" />
<property name = "q33_2" column = "q33_2" />
<property name = "q33_3" column = "q33_3" />
<property name = "q33_4" column = "q33_4" />
<property name = "q33_5" column = "q33_5" />
<property name = "q33_6" column = "q33_6" />
<property name = "q33_7" column = "q33_7" />
<property name = "q33_8" column = "q33_8" />
<property name = "q33_9" column = "q33_9" />
<property name = "q33_10" column = "q33_10" />
<property name = "q33_11" column = "q33_11" />
<property name = "q33_12" column = "q33_12" />
<property name = "q33a_1" column = "q33a_1" />
<property name = "q33a_2" column = "q33a_2" />
<property name = "q33a_3" column = "q33a_3" />
<property name = "q33a_4" column = "q33a_4" />
<property name = "q33a_5" column = "q33a_5" />
<property name = "q33a_6" column = "q33a_6" />
<property name = "q33a_7" column = "q33a_7" />
<property name = "q33a_8" column = "q33a_8" />
<property name = "q33a_9" column = "q33a_9" />
<property name = "q33a_10" column = "q33a_10" />
<property name = "q33a_11" column = "q33a_11" />
<property name = "q33a_12" column = "q33a_12" />
<property name = "q35" column = "q35" />
<property name = "q36" column = "q36" />
<property name = "q37" column = "q37" />
<property name = "q38" column = "q38" />
<property name = "q41_EE" column = "q41_EE" />
<property name = "q41_Al" column = "q41_Al" />
<property name = "q42" column = "q42" />
<property name = "q43" column = "q43" />
<property name = "q44" column = "q44" />
<property name = "q45_1" column = "q45_1" />
<property name = "q45_2" column = "q45_2" />
<property name = "q45_3" column = "q45_3" />
<property name = "q45_4" column = "q45_4" />
<property name = "q45_5" column = "q45_5" />
<property name = "q45_6" column = "q45_6" />
<property name = "q45_7" column = "q45_7" />
<property name = "q47" column = "q47" />
<property name = "q48" column = "q48" />
<property name = "q49" column = "q49" />
<property name = "q50" column = "q50" />
<property name = "q51" column = "q51" />
<property name = "q51a" column = "q51a" />
<property name = "q52" column = "q52" />
<property name = "q53" column = "q53" />
<property name = "q54" column = "q54" />
<property name = "q55" column = "q55" />
<property name = "q56" column = "q56" />
<property name = "q57" column = "q57" />
<property name = "q58" column = "q58" />
<property name = "q59" column = "q59" />
<property name = "q60" column = "q60" />
<property name = "q60a" column = "q60a" />
<property name = "q61" column = "q61" />
<property name = "q62" column = "q62" />
<property name = "q74" column = "q74" />
<property name = "q76" column = "q76" />
<property name = "q77" column = "q77" />
<property name = "q78" column = "q78" />
<property name = "q79" column = "q79" />
<property name = "q80" column = "q80" />
<property name = "q82" column = "q82" />
<property name = "q83" column = "q83" />
<property name = "q84" column = "q84" />
<property name = "q86" column = "q86" />
<property name = "q87" column = "q87" />
<property name = "q88" column = "q88" />
<property name = "q89" column = "q89" />
<property name = "q90" column = "q90" />
<property name = "q91" column = "q91" />
<property name = "q93" column = "q93" />
<property name = "q94" column = "q94" />
<set name = "q9" lazy = "true" cascade = "all-delete-orphan">
<key column = "turma_id" />
<one-to-many class = "escola.Q9" />
</set>
<set name = "q10" lazy = "true" cascade = "all-delete-orphan">
<key column = "turma_id" />
<one-to-many class = "escola.Q10" />
</set>
<set name = "q12" lazy = "true" cascade = "all-delete-orphan">
<key column = "turma_id" />
<one-to-many class = "escola.Q12" />
</set>
<set name = "q17" lazy = "true" cascade = "all-delete-orphan">
<key column = "turma_id" />
<one-to-many class = "escola.Q17" />
</set>
<!--<set name = "q19" lazy = "true" cascade = "all-delete-orphan">
<key column = "turma_id" />
<one-to-many class = "escola.Q19" />
</set>-->
<set name = "q34" lazy = "true" cascade = "all-delete-orphan">
<key column = "turma_id" />
<one-to-many class = "escola.Q34" />
</set>
<set name = "q22DiscAl"
lazy = "true"
cascade = "all-delete-orphan"
order-by = "disciplina">
<key column = "turma_id" />
<one-to-many class = "escola.Q22DiscAl" />
</set>
</class>
</hibernate-mapping>

Code between sessionFactory.openSession() and session.close():
public void setTudo() throws HibernateException {
Session sess = Utilitarios.currentSession();
LeLista ll = new LeLista();
/*
if ( (Porteiro.oano != 0) && (!Porteiro.aturma.equals("")) &&
(Porteiro.aepoca != 0)) {
ut = Utilitarios.getUtilizador(Porteiro.oano, Porteiro.aturma,
Porteiro.aepoca);
//System.out.println("turma da query: " + p.aturma);

}
*/
//***
if ( (Porteiro.oano != 0) && (!Porteiro.aturma.equals("")) &&
(Porteiro.aepoca != 0)) {
ut = Porteiro.oUtilizador;
//System.out.println("ut: " + ut.getRelatorio().getTurma().getQ2());
}

//***
else {
ut = Utilitarios.getUtilizador(ll.oAno( (String) visual.
jListTurmas.getSelectedValue()),
ll.aTurma( (String) visual.
jListTurmas.
getSelectedValue()), getSel());
}

// povoa label turma
String turma = ut.getRelatorio().getTurma().getQ2() + "

you need to have the session opened when hitting the lazy initialised class or association...

tx for your answer, Antony, but i'm afraid i didnt get it, because, even if i open session before hitting the set, i get the same error msg except if i also make:
session.update(ut);
well, this way it works; so i insist: is it safe to do it the way i do?
thanks again

be sure to understand what detached object mean.

1- you get your object from a session --> all is fine, lazy will work
2- you close the session --> bug if you try to access a lazy loaded propety --> your object is detached
3- if you open a new session, be sure to reattach the object by calling session.update or session.lock --> that's why your case is working.

Managing your session is the most important

PS: i don't have time to read your java code, so i can be wrong...

the Object containing the lazy collection needs to be associated with a session. so just having 'an' open session is not good enough.

you can call Session.lock(yourObject, LockMode.NONE) to re-associate your object with a session, then access the lazy set and then close the session.


pascal

as said in the previous post...

1a - i create the object ut in lets call it A.Class and store it in a static var

1b - then, in B.class i make

In the meanwhile i'm certain no session was closed!
So to Anthony's point #3, i only had to open a new session in order to re.atach, because i figure i allready had (allways) an opened session...

Perhaps with this treatment i use i no longer have a session (at least one that's associated with my ut object)

So i understand Pascal's saying:


Right?
thanks a lot to both for helping me!