SessionImpl.updateReachableCollection Error

sanjuantony · **Joined:** Thu Oct 30, 2003 6:41 pm **Posts:** 4

Hi,
I am trying to insert data into a table. I have to do so in a cascading manner. Let me give you a brief idea. I have an Object A which contains a collection of Object B.
Now when i try to insert Object A into a Table A, i would like to insert data of Object B into Table B.

i have coded the files as per many examples that i ahev found in the site and in the reference doc. However while saving data i get the following error...

java.lang.NullPointerException
at net.sf.hibernate.impl.SessionImpl.updateReachableCollection(SessionImpl.java:2539)
at net.sf.hibernate.impl.SessionImpl.updateReachable(SessionImpl.java:2577)
at net.sf.hibernate.impl.SessionImpl.updateReachables(SessionImpl.java:2682)
at net.sf.hibernate.impl.SessionImpl.flushEntities(SessionImpl.java:2259)
at net.sf.hibernate.impl.SessionImpl.flushEverything(SessionImpl.java:2017)
at net.sf.hibernate.impl.SessionImpl.flush(SessionImpl.java:2004)

My Mapping files are as shown below
For Object A its...
<bag name="_objectAList" inverse="true" cascade="all">
<key column="OBJECTA_ID"/>
<one-to-many class="ObjectB"/>
</bag>

For Object B its ...
<many-to-one name="_objectA" column="OBJECTA_ID" not-null="true"/>

Any ideas as to why this could be happening.

Thanx.

emmanuel · **Posted:** Thu Oct 30, 2003 6:58 pm

Czn you show the code that fill A, B and save A. Did you do b.setObjectA(a) before saving

gavin · **Posted:** Thu Oct 30, 2003 6:59 pm

Nowhere near enough information. especially, make sure you try the code against the latest release of Hibernate 2.1 (2.1beta5) before anything else.

sanjuantony · **Joined:** Thu Oct 30, 2003 6:41 pm **Posts:** 4

Hey thanx guys for the suggestions,
I resolved that issue by adding the <update-value="any"> attrbute in the <id> tag of ObjectB

However i would appreciate if i could get site/ doc which explains what exactly update-value does. I mean what does the value any,null or none actually indicate...

Thanx & Warm Regards.

emmanuel · **Posted:** Thu Oct 30, 2003 7:47 pm

section 7.5 of the reference guide

Quote:

The unsaved-value attribute of the <id> mapping specifies which identifier values should be interpreted as representing a "new" instance.
The allowed values of unsaved-value are:
* any - always save
* none - always update
* null - save when identifier is null (this is the default)
* valid identifier value - save when identifier is null or the given value