Lazy initialization - property does not get initialized

rolandz · **Posted:** Thu Jan 12, 2006 8:22 am

I decided to make it a new topic...

I have lazy initialization in a Data class:

Code:

<hibernate-mapping xmlns="urn:nhibernate-mapping-2.0">
  <class name="Pix.Data.Data, Pix.Data" table="PICTURE" lazy="true">
    <id name="Id" column="ID" type="Int32"
          unsaved-value="0"access="field">
      <generator class="sequence">
        <param name="sequence">OBJECT_ID_GEN</param>
      </generator>
    </id>
    <property name="Bytes" column="IMAGE" type="BinaryBlob"
                    access="field" />
    <one-to-one name="Owner" class="Pix.Data.Picture, Pix.Data"
                       access="field" />
  </class>
</hibernate-mapping>

Great... But now when I read my stored Picture object, I do NOT have Data field being initialized. Can anyone explain it to me? Does the generic proxy implementation in NHibernate (it is Castle, isn't i?) work with fields? If it does then why just simple invokation:

Code:

void Read(ISession sess, int id)
{
  Picture pic = (Picture)sess.Load(typeof(Picture), id);
  ShowPicture(pic.Data.Bytes);
}

doesn't work? The Data property has been initialized (I see it is just the proxy), but the data in it is NOT. Owner is null, id is zero, Bytes is null.

When I don't use lazy loading then it works :|

For more details on the design please see my previous topic related to one-to-one relationship at http://forum.hibernate.org/viewtopic.php?t=953923

TIA

samujob · **Joined:** Tue Jan 03, 2006 7:21 am **Posts:** 85

Have you tried setting the Data property in the Picture class as Virtual.

rolandz · **Posted:** Fri Jan 13, 2006 3:52 am

samujob wrote:

Have you tried setting the Data property in the Picture class as Virtual.

Well... I've made it virtual but it does not help.

Note that when no lazy init is being done then it works perfectly. But for me the lazy init was a benefit of the solutiion...

rolandz · **Posted:** Fri Jan 13, 2006 7:20 am

rolandz wrote:

samujob wrote:

Have you tried setting the Data property in the Picture class as Virtual.

Well... I've made it virtual but it does not help.

Note that when no lazy init is being done then it works perfectly. But for me the lazy init was a benefit of the solutiion...

Great!!! After I've read the topic at http://forum.hibernate.org/viewtopic.php?t=954014 I realized my mistake... Now it works. Thanx a lot :)

rolandz · **Posted:** Fri Jan 13, 2006 8:28 am

Again,

Since I've missed a place in the documentation where exactly it is written that for proxy there must be a virtualization being applied, could somebody point me that place? Just for curiousity :)

sergey · **Posted:** Fri Jan 13, 2006 8:40 am

http://www.hibernate.org/hib_docs/nhibernate/html/basic-mapping.html#mapping-declaration-class
http://www.hibernate.org/359.html#A5

I must admit that it's not exactly written in big bold blinking red, but it's there...