Hi Jakob,
Thanks for the quick response. I'm using the 1.0.1 release.
The npe occuring at line 408 (snippet below). In the scenario I'm running both
'list' and 'child' are null. The npe is from the 'list.add' call.
405 // Identities may not be equal due to type-mismatch
406 Collection list = (Collection) ownerIdsToLists.get(ownerId);
407 Object child = childMap.get(childId);
408 list.add(child);
Cheers
Adam
Quoting Jakob Braeuchi <[EMAIL PROTECTED]>:
> hi,
>
> what version of ojb are you using ? could you please provide the line number
>
> where the npe occurs ?
>
> jakob
>
> [EMAIL PROTECTED] schrieb:
>
> >
> >
> > Hi All,
> >
> > I'm firing this at both lists as I can't figure out whether it's a bug in
> the
> > code or my mapping.
> >
> > I'm trying to accomplish a pretty simple mn relationship (user/group type
> > arrangement). The mapping file for the section in question is attached
> below.
> > I have some test data (also below, in dbunit dataset format) which I've
> > verified in the database and everytime I try to load a group it throws a
> null
> > pointer at me. Any assistance would be appreciated. Let me know if you
> would
> > like any more information.
> >
> >
> > :Mapping File:
> >
> > <class-descriptor
> > class="com.interlinkj.ac.User"
> > table="USERS"
> > row-reader="com.interlinkj.db.UserRowReader">
> > <field-descriptor
> > name="id"
> > column="id"
> > jdbc-type="INTEGER"
> > primarykey="true"
> > autoincrement="true"/>
> > <field-descriptor
> > name="firstName"
> > column="firstname"
> > jdbc-type="VARCHAR"
> > nullable="false"/>
> > <field-descriptor
> > name="lastName"
> > column="lastname"
> > jdbc-type="VARCHAR"
> > nullable="false"/>
> > <field-descriptor
> > name="userName"
> > column="username"
> > jdbc-type="VARCHAR"
> > nullable="false"/>
> > <field-descriptor
> > name="passwordHash"
> > column="credentials"
> > jdbc-type="VARCHAR"
> > nullable="false"/>
> > <collection-descriptor
> > name="groups"
> > element-class-ref="com.interlinkj.ac.Group"
> > indirection-table="USER_GROUP_LINK"
> > auto-delete="link"
> > auto-update="object"
> > auto-retrieve="true"
> > orderby="id"
> > sort="ASC"
> > >
> > <fk-pointing-to-this-class column="user_id"/>
> > <fk-pointing-to-element-class column="group_id"/>
> > </collection-descriptor>
> > </class-descriptor>
> >
> > <class-descriptor
> > class="com.interlinkj.ac.Group"
> > table="GROUPS"
> > row-reader="com.interlinkj.db.GroupRowReader">
> > <field-descriptor
> > name="id"
> > column="id"
> > jdbc-type="INTEGER"
> > primarykey="true"
> > autoincrement="true"/>
> > <field-descriptor
> > name="name"
> > column="name"
> > jdbc-type="VARCHAR"
> > nullable="false"/>
> > <field-descriptor
> > name="description"
> > column="description"
> > jdbc-type="VARCHAR"
> > nullable="true"/>
> > <field-descriptor
> > name="type"
> > column="type"
> > jdbc-type="VARCHAR"
> > nullable="false"
> > conversion="com.interlinkj.db.GroupTypeConversion"/>
> > <collection-descriptor
> > name="users"
> > element-class-ref="com.interlinkj.ac.User"
> > indirection-table="USER_GROUP_LINK"
> > auto-delete="link"
> > auto-update="object"
> > auto-retrieve="true"
> > orderby="id"
> > sort="ASC"
> > >
> > <fk-pointing-to-this-class column="group_id"/>
> > <fk-pointing-to-element-class column="user_id"/>
> > </collection-descriptor>
> > </class-descriptor>
> >
> > :Test Data (for those not familiar with DBUnit, the element name is the
> table,
> > the attributes are the columns, and each element represents a row [in
> order]):
> >
> > <dataset>
> > <GROUPS id="1" type="Designer Group" name="Designer Group"
> > description="This is a designer group."/>
> > <GROUPS id="2" type="Data Entry Group" name="Data Entry Group"
> > description="This is a data entry group."/>
> > <USERS id="1" firstname="Bernard" lastname="Black"
> username="blblack"
> > credentials="jamjamjam"/>
> > <USERS id="2" firstname="Manny" lastname="Bianco" username="manny"
> > credentials="brilliant"/>
> > <USER_GROUP_LINK group_id="1" user_id="1"/>
> > <USER_GROUP_LINK group_id="2" user_id="2"/>
> > </dataset>
> >
> >
> > :Stack Trace:
> >
> > java.lang.NullPointerException
> > at
> >
>
org.apache.ojb.broker.accesslayer.MtoNCollectionPrefetcher.associateBatched(Unknown
> > Source)
> > at
> >
>
org.apache.ojb.broker.accesslayer.MtoNCollectionPrefetcher.prefetchRelationship(Unknown
> > Source)
> > at
> >
> org.apache.ojb.broker.core.QueryReferenceBroker.performRetrievalTasks(Unknown
> > Source)
> > at
> >
> org.apache.ojb.broker.core.QueryReferenceBroker.getCollectionByQuery(Unknown
> Source)
> > at
> >
> org.apache.ojb.broker.core.QueryReferenceBroker.getCollectionByQuery(Unknown
> Source)
> > at
> >
> org.apache.ojb.broker.core.QueryReferenceBroker.getCollectionByQuery(Unknown
> Source)
> > at
> > org.apache.ojb.broker.core.QueryReferenceBroker.retrieveCollection(Unknown
> Source)
> > at
> > org.apache.ojb.broker.core.QueryReferenceBroker.retrieveCollections(Unknown
> Source)
> > at
> > org.apache.ojb.broker.accesslayer.RsIterator.getObjectFromResultSet(Unknown
> Source)
> > at org.apache.ojb.broker.accesslayer.RsIterator.next(Unknown
> Source)
> > at
> > org.apache.ojb.broker.core.PersistenceBrokerImpl.getObjectByQuery(Unknown
> Source)
> > at
> >
> org.apache.ojb.broker.core.DelegatingPersistenceBroker.getObjectByQuery(Unknown
> > Source)
> > at
> >
> org.apache.ojb.broker.core.DelegatingPersistenceBroker.getObjectByQuery(Unknown
> > Source)
> > at com.interlinkj.db.DatabaseManager.loadByFieldValue(Unknown
> Source)
> > at com.interlinkj.db.GroupManager.loadById(Unknown Source)
> > at
> com.interlinkj.db.TestGroupManager.testLoadWithIndividualUser(Unknown
> > Source)
> > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> > at
> >
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> > at
> >
>
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> > at java.lang.reflect.Method.invoke(Method.java:585)
> > at junit.framework.TestCase.runTest(TestCase.java:154)
> > at junit.framework.TestCase.runBare(TestCase.java:127)
> >
> >
> > :Calling Code:
> >
> > Criteria crit = new Criteria();
> > crit.addEqualTo("id", new Integer(1));
> > Query q = newQuery(Group.class, crit);
> > broker = newPersistenceBroker(); //just a helper method to
> default
> > broker
> > Object tmp = broker.getObjectByQuery(q);
> >
> > //Null pointer before it gets here
> >
> > if(tmp == null){
> > throw new FindException(
> > getShortClassName(clazzToLoad) +
> > " with " +
> > fieldName +
> > " of " +
> > fieldValue +
> > " does not exist."
> > );
> > }
> > return (T)tmp;
> >
> >
> >
> >
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