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qmaster
 Post subject: Cascade save() -> "the given object has a null ident
PostPosted: Fri Mar 17, 2006 2:46 am 
Regular
Regular

Joined: Sat Jan 07, 2006 8:30 pm
Posts: 68
This is the simple Parent/Child problem.
Both Parent and Child have pk as Integer id

I need to create/insert a Parent along with many children in same time

Code:
Parent parent = new Parent("Parent");
parent.addChild( new Child("First") )
parent.addChild( new Child("Second") )
session.save( parent )

where addChild is bi-directional parent is set in child


Parent mapping
Code:
<class name="Parent" table="parent" schema="public">
        <id name="id" type="integer">
            <column name="id" />
            <generator class="sequence">
      <param name="sequence">parent_id_seq</param>
       </generator>
        </id>
...

        <set name="children" table="child" lazy="true" inverse="true" cascade="all" sort="unsorted">
   <key column="id"/>
      <one-to-many class="Child" />
   </set>   
</class>


Child mapping
Code:
<class name="Child" table="child" schema="public">
   <id name="id" type="integer" unsaved-value="null">
       <column name="id" />
       <generator class="sequence">
         <param name="sequence">child_id_seq</param>
      </generator>
   </id>
   ...

   <many-to-one name="parent" class="Parent" column="id" insert="false" update="false" lazy="false"/>

</class>



Well that all to it when I run the code it get the following output

Code:

2006-03-17 00:15:09,140  DEBUG  org.hibernate.impl.SessionImpl.<init>(SessionImpl.java:273) - opened session at timestamp: 4679991743037440
2006-03-17 00:15:11,078  DEBUG  org.hibernate.transaction.JDBCTransaction.begin(JDBCTransaction.java:54) - begin
2006-03-17 00:15:11,078  DEBUG  org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:358) - opening JDBC connection
2006-03-17 00:15:11,078  DEBUG  org.hibernate.transaction.JDBCTransaction.begin(JDBCTransaction.java:59) - current autocommit status: true
2006-03-17 00:15:11,093  DEBUG  org.hibernate.transaction.JDBCTransaction.begin(JDBCTransaction.java:62) - disabling autocommit
2006-03-17 00:15:11,093  DEBUG  org.hibernate.jdbc.JDBCContext.afterTransactionBegin(JDBCContext.java:190) - after transaction begin
2006-03-17 00:15:11,109  DEBUG  org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:161) - saving transient instance
2006-03-17 00:15:11,109  DEBUG  org.hibernate.jdbc.AbstractBatcher.logOpenPreparedStatement(AbstractBatcher.java:311) - about to open PreparedStatement (open PreparedStatements: 0, globally: 0)
2006-03-17 00:15:11,109  DEBUG  org.hibernate.jdbc.AbstractBatcher.log(AbstractBatcher.java:346) - select nextval ('parent_id_seq')
2006-03-17 00:15:11,109  DEBUG  org.hibernate.jdbc.AbstractBatcher.getPreparedStatement(AbstractBatcher.java:424) - preparing statement
2006-03-17 00:15:11,109  DEBUG  org.hibernate.id.SequenceGenerator.generate(SequenceGenerator.java:82) - Sequence identifier generated: 186
2006-03-17 00:15:11,109  DEBUG  org.hibernate.jdbc.AbstractBatcher.logClosePreparedStatement(AbstractBatcher.java:319) - about to close PreparedStatement (open PreparedStatements: 1, globally: 1)
2006-03-17 00:15:11,125  DEBUG  org.hibernate.jdbc.AbstractBatcher.closePreparedStatement(AbstractBatcher.java:470) - closing statement
2006-03-17 00:15:11,125  DEBUG  org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:106) - generated identifier: 186, using strategy: org.hibernate.id.SequenceGenerator
2006-03-17 00:15:11,125  DEBUG  org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:139) - saving [Parent#186]
2006-03-17 00:15:11,125  DEBUG  org.hibernate.engine.Cascade.cascade(Cascade.java:237) - processing cascade ACTION_SAVE_UPDATE for: Parent
2006-03-17 00:15:11,125  DEBUG  org.hibernate.engine.Cascade.cascade(Cascade.java:259) - done processing cascade ACTION_SAVE_UPDATE for: Parent
2006-03-17 00:15:11,125  DEBUG  org.hibernate.event.def.WrapVisitor.processArrayOrNewCollection(WrapVisitor.java:87) - Wrapped collection in role: Parent.children
2006-03-17 00:15:11,156  DEBUG  org.hibernate.engine.Cascade.cascade(Cascade.java:237) - processing cascade ACTION_SAVE_UPDATE for: Parent
2006-03-17 00:15:11,171  DEBUG  org.hibernate.engine.Cascade.cascadeCollectionElements(Cascade.java:285) - cascade ACTION_SAVE_UPDATE for collection: Parent.children
2006-03-17 00:15:11,171  DEBUG  org.hibernate.engine.CascadingAction$1.cascade(CascadingAction.java:133) - cascading to saveOrUpdate: Child
2006-03-17 00:15:11,171  DEBUG  org.hibernate.event.def.AbstractSaveEventListener.getEntityState(AbstractSaveEventListener.java:471) - detached instance of: Child
2006-03-17 00:15:11,171  DEBUG  org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsDetached(DefaultSaveOrUpdateEventListener.java:202) - updating detached instance
                                org.hibernate.TransientObjectException: The given object has a null identifier: Child



I see no error but maybe I got tired to look at this code over and over again.

What do you see ?

Q


Last edited by qmaster on Mon Mar 20, 2006 2:37 pm, edited 1 time in total.

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david
 Post subject:
PostPosted: Fri Mar 17, 2006 6:27 am 
Hibernate Team
Hibernate Team

Joined: Tue Aug 26, 2003 7:19 pm
Posts: 2364
Location: Brisbane, Australia
Read the parent child section of the manual again.
You need to understand what inverse=true means and how this affects the bi-directional relationship.

Hint: as soon as you said inverse=true on the one-to-many side, eg the set, you tell hibernate that the responcible relation updates occur in the other side, eg, the Many-to-one side. Thus you have two problems:
1) insert and update is false on the many-to-one which disables the update so no relationship can be created.
2) You don't set the Many-to-one in you setup code.
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qmaster
 Post subject: Re:
PostPosted: Fri Mar 17, 2006 10:37 am 
Regular
Regular

Joined: Sat Jan 07, 2006 8:30 pm
Posts: 68
Forgot to mentioned that I tried also inverse="false" in one-to-many so I'd let Parent to manage the link but no changes.

I'm not sure what David tries to say with
>2) You don't set the Many-to-one in you setup code.

When I do parent.add( new Child() ) it does that does that

Parent has this method

public void add( Child c )
{
children.add( c );
c.setParent( this );
}


Your thoughts are much appreciated!

Q
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qmaster
 Post subject: Re:
PostPosted: Fri Mar 17, 2006 10:46 am 
Regular
Regular

Joined: Sat Jan 07, 2006 8:30 pm
Posts: 68
A very strange thing is that unsaved-value="null" is not triggering the sequence call. Most likely is a problem in the relationship but I don't see it...
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qmaster
 Post subject: Anyone ?
PostPosted: Sun Mar 19, 2006 11:39 am 
Regular
Regular

Joined: Sat Jan 07, 2006 8:30 pm
Posts: 68
Can anyone tell me what's wrong ?

I tried inverse=true and inverse=false,
also I removed the insert and update attributes in many-to-one. I tried almost everything. Somehow the save(parent) triggers saveOrUpdate !!!!!(???)

Should I first save the parent without the kids and then add the kids ?
As i said, unsaved-value="null" should trigger the insert since the id *are* null when I try to save the parent.

Should I give entirely up this approach and do the composite one ? Why would that work ?

Just your thoughts. I read the documentation over and over again.
This case, where I generate the ids with a sequence are briefly mentioned in the Parent/Child chapter.


Briefly, what I want is to be able to insert/update the kids from parent.
The kid update/insert should not alter the parent in anyway thus initially I've put there insert=false update=false

Anyone ? If you have an example that has been *tested* please let me k now.

TIA,
Q
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qmaster
 Post subject: Echo
PostPosted: Mon Mar 20, 2006 2:36 pm 
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Regular

Joined: Sat Jan 07, 2006 8:30 pm
Posts: 68
Anybody here ? Anybody here ?
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qmaster
 Post subject: Hibernate session interceptor
PostPosted: Wed Mar 22, 2006 1:24 pm 
Regular
Regular

Joined: Sat Jan 07, 2006 8:30 pm
Posts: 68
I found the answer to my problem.

Wasn't the mapping. If you ever implement a Hibernate Session Interceptor make sure you return null in isTransient() overriden method !

I was returning Boolean.FALSE and that screw the cascading for save-updated even thought the session.save( parent ) worked great!
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