I have a problem when I'm loading an object (A) having two one-to-one relationship with another kind of object(B):

the associations are bidirectional and lazy loading seems not function. In a few words, when I get the object A, hibernate retrive immediately from database two objects B.

Hibernate: select this_.HDHAND as HDHAND102_0_, this_.PRPARCOD as PRPARCOD102_0_, this_.HDPARKBAY as HDPARKBAY102_0_, this_.HDPARKRO as HDPARKRO102_0_, this_.HDPARKTIER as HDPARKTIER102_0_, this_.TIYBA as TIYBA102_0_, this_.HDCOMCLS as HDCOMCLS102_0_, this_.HDPREFIX as HDPREFIX102_0_, this_.HDSERIAL as HDSERIAL102_0_, this_.HDCHKDIG as HDCHKDIG102_0_, this_.HDPLANIN as HDPLANIN102_0_ from YDATTST.HAND00F this_ fetch first 1 rows only |#]

Hibernate: select liftingin0_.LILIFT as LILIFT103_0_, liftingin0_.HDHAND as HDHAND103_0_, liftingin0_.LIREFVIS as LIREFVIS103_0_ from YDATTST.LIFT00F liftingin0_ where liftingin0_.HDHAND=? and liftingin0_.LILISEQUEN='1000'|#]

Hibernate: select liftingout0_.LILIFT as LILIFT103_0_, liftingout0_.HDHAND as HDHAND103_0_, liftingout0_.LIREFVIS as LIREFVIS103_0_ from YDATTST.LIFT00F liftingout0_ where liftingout0_.HDHAND=? and liftingout0_.LILISEQUEN='2000'|#]


These are the mappings of the two class:
A=>Handling
B=>Lifting

A)<hibernate-mapping>
<class
name="app.tis.lib.Handling"
table="YDATTST.HAND00F"
polymorphism="implicit"
lazy="true"
dynamic-update="true"
optimistic-lock="dirty"
>
<id
name="id"
column="HDHAND"
type="long"
>
</id>
<generator class="assigned"></generator>
...
<one-to-one name="liIn" lazy="proxy" class="app.tis.lib.LiftingIn" property-ref="hd" constrained="true"/>

<one-to-one name="liOut" lazy="proxy" class="app.tis.lib.LiftingOut" property-ref="hd" constrained="true"/>

</class>

</hibernate-mapping>

B)<hibernate-mapping>

<class name="app.tis.lib.Lifting" table="YDATTST.LIFT00F" lazy="true">
<composite-id name="id" class="app.tis.compositepk.LiftingId">
<key-property name="liftNum" column="LILIFT"></key-property>
<key-property name="hdHand" column="HDHAND"></key-property>
</composite-id>

<discriminator column="LILISEQUEN" type="string" />

<subclass name="app.tis.lib.LiftingIn" discriminator-value="1000" lazy="true">
<many-to-one
lazy="proxy"
insert="false"
update="false"
name="hd"
class="app.tis.lib.Handling"
unique="true"
column="HDHAND">
</many-to-one>
</subclass>

<subclass name="app.tis.lib.LiftingOut" discriminator-value="2000" lazy="true">
<many-to-one
lazy="proxy"
insert="false"
update="false"
name="hd"
class="app.tis.lib.Handling"
unique="true"
column="HDHAND"
>
</many-to-one>
</subclass>

</class>

</hibernate-mapping>


Someone can explain me why lazy loading goes away????I try setting lazy=true/proxy everywhere is possible
Thank you in advance

I think this WIKI entry should help you:

http://www.hibernate.org/162.html

I have already read this article and I follow it; it says:

if your B->C mapping is mandatory (constrainted=true), Hibernate will use proxy for C resulting in lazy initialization

If you see my mappings there is a constrainted=true on the two one-to-one relationship; but lazy loading doesn't work

HELP!!!

Yes, but you did not enable proxy on the class / subclass, have a look at the first comment on the wiki page:

I enable proxy on the class/subclass

For Lifting:
<class name="app.tis.lib.Lifting" table="YDATTST.LIFT00F" lazy="true">
<subclass name="app.tis.lib.LiftingIn" discriminator-value="1000" lazy="true">
<subclass name="app.tis.lib.LiftingOut" discriminator-value="2000" lazy="true">

For Handling
<class name="app.tis.lib.Handling" table="YDATTST.HAND00F" polymorphism="implicit" lazy="true" dynamic-update="true" optimistic-lock="dirty">

Have you seen?