not-null property references a null or transient value

luk · **Joined:** Fri Oct 21, 2005 11:29 am **Posts:** 6

Hibernate version:
3.0.5
Mapping documents:
Picture.hbm.xml:

Code:

<many-to-one name="gallery" column="gallery_id" class="Gallery" lazy="false" not-null="true" outer-join="auto" />

Gallery.hbm.xml:

Code:

<bag name="pictures" inverse="true" order-by="created desc" cascade="all" lazy="true">
           <key column="gallery_id" />
            <one-to-many class="Picture" />
        </bag>

Code between sessionFactory.openSession() and session.close():

Code:

Gallery gallery = galleryManager.getById(new Long(request.getParameter("galleryId")));
gallery.addPicture(pictureForm);
pictureManager.save(pictureForm);

where (Gallery.java):

Code:

public void addPicture(Picture picture) {      
    picture.setGallery(this);      
    pictures.add(picture);
}

Full stack trace of any exception that occurs:

Code:

org.springframework.orm.hibernate3.HibernateSystemException: not-null property references a null or transient value: Picture._picturesBackref; nested exception is org.hibernate.PropertyValueException: not-null property references a null or transient value: Picture._picturesBackref
org.hibernate.PropertyValueException: not-null property references a null or transient value: Picture._picturesBackref
   at org.hibernate.engine.Nullability.checkNullability(Nullability.java:72)
   at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:236)
   at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:160)
   at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:108)
   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:481)
   at org.hibernate.impl.SessionImpl.save(SessionImpl.java:476)
   at org.springframework.orm.hibernate3.HibernateTemplate$12.doInHibernate(HibernateTemplate.java:598)
   at org.springframework.orm.hibernate3.HibernateTemplate.execute(HibernateTemplate.java:358)
   at org.springframework.orm.hibernate3.HibernateTemplate.save(HibernateTemplate.java:595)
   at PictureManager.save(PictureManager.java:30)

Name and version of the database you are using:
PostgreSQL 8.03.

When I try to add picture to gallery I get exception. If it is my mistake or Hibernate bug? I read http://jroller.com/page/RickHigh?entry= ... l_property but I can't find how to fix my code... Any help? Thanks in advance.

--
Regards,
Luk

pksiv · **Posted:** Fri Oct 21, 2005 2:49 pm

What do you mapping files look like ?

The error is telling you that this field Picture._picturesBackref contains a NULL value and it's not allowed to.

luk · **Joined:** Fri Oct 21, 2005 11:29 am **Posts:** 6

The problem is that there is no such field _picturesBackref. Mapping between Gallery and Picture is in my first post.

--
Regards,
Luk

luk · **Joined:** Fri Oct 21, 2005 11:29 am **Posts:** 6

Any help?

d · **Joined:** Mon Jul 04, 2005 5:19 pm **Posts:** 720

Can you do what Preston has asked and post the mapping files for Gallery and Picture?

luk · **Joined:** Fri Oct 21, 2005 11:29 am **Posts:** 6

Here You are: :)
Picture.hbm.xml

Code:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" 
    "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>

   <class name="Picture" table="picture">
   
      <id name="id" column="id" type="long" unsaved-value="null">
         <generator class="native">
            <param name="sequence">picture_id</param>
            </generator>
      </id>            
      
      <property name="name" column="name" type="java.lang.String" />
      <property name="description" column="description" type="java.lang.String" />      
      <property name="path" column="path" type="java.lang.String" />
      <property name="fileName" column="file_name" type="java.lang.String" />
      <property name="rating" column="rating" type="java.lang.Double" />
      <property name="enabled" column="enabled" type="java.lang.Boolean" />
      <property name="visible" column="visible" type="java.lang.Boolean" />
      <property name="created" column="created" type="java.util.Date" />
      <property name="changed" column="changed" type="java.util.Date" />
      
      <many-to-one name="gallery" column="gallery_id" class="Gallery" lazy="false" not-null="true" outer-join="auto" />

   </class>      

</hibernate-mapping>

Gallery.hbm.xml

Code:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" 
    "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
   
<hibernate-mapping>

   <class name="Gallery" table="gallery">
   
      <id name="id" column="id" type="long" unsaved-value="null">
         <generator class="native">
            <param name="sequence">gallery_id</param>
            </generator>
      </id>            
      
      <property name="name" column="name" type="java.lang.String" />
      <property name="description" column="description" type="java.lang.String" />            
      <property name="enabled" column="enabled" type="java.lang.Boolean" />
      <property name="visible" column="visible" type="java.lang.Boolean" />
      <property name="created" column="created" type="java.util.Date" />
      <property name="changed" column="changed" type="java.util.Date" />
      
      <many-to-one name="author" column="author_id" class="Member" unique="true" not-null="true" lazy="false" outer-join="auto" />
      
      <bag name="pictures" inverse="true" order-by="created desc" cascade="all" lazy="true">
           <key column="gallery_id" />
            <one-to-many class="Picture" />
        </bag>
      
   </class>      

</hibernate-mapping>

luk · **Joined:** Fri Oct 21, 2005 11:29 am **Posts:** 6

Come on guys :) I belive that someone knows solution...

luk · **Joined:** Fri Oct 21, 2005 11:29 am **Posts:** 6

So I guess it's Hibernate bug, right?

jbarnum · **Joined:** Wed May 11, 2005 11:57 pm **Posts:** 80

luk wrote:

Come on guys :) I belive that someone knows solution...

Try swapping the order that picture and gallery are saved in. If picture has a reference to gallery, and you try to call session.save(picture) before calling sesison.save(gallery), then gallery is still transient, thus your exception message.

IMHO this is a crappy workaround for a bug in Hibernate; I think that checking for whether the related instances are transient should be delayed until session.flush()