FAQ
I'm having a problem w/an NPE. 99.999999% of all our exceptions are
NPE's, so let me be a bit more specific :-)

- create child data context
- Create new record A
- Create a child record B.
- Delete child record B. NB! here B is not committed to the database yet.
- commit on child data context(which goes all the way to the root
datacontext) => NPE


I've recently burnt myself on delete rules and I'm wondering if this
is another incarnation of that problem.

A has a Cascade delete rule for B. B has a Nullify.


Cayenne 1.2.1


Caused by: java.lang.NullPointerException: Attempt to add null target
DataObject.
at org.objectstyle.cayenne.CayenneDataObject.addToManyTarget(CayenneDataObject.java:298)
at org.objectstyle.cayenne.access.ChildDiffLoader.arcCreated(ChildDiffLoader.java:146)
at org.objectstyle.cayenne.access.ObjectDiff$ArcOperation.apply(ObjectDiff.java:408)
at org.objectstyle.cayenne.graph.CompoundDiff.apply(CompoundDiff.java:133)
at org.objectstyle.cayenne.access.ObjectStoreGraphDiff.apply(ObjectStoreGraphDiff.java:155)
at org.objectstyle.cayenne.access.DataContext.onContextFlush(DataContext.java:1215)
at org.objectstyle.cayenne.access.DataContext.onSync(DataContext.java:1192)
at org.objectstyle.cayenne.access.DataContext.flushToParent(DataContext.java:1261)
at org.objectstyle.cayenne.access.DataContext.commitChangesToParent(DataContext.java:1150)
at com.zylin.payback.app.html.EditTreatment.submit(EditTreatment.java:209)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.tapestry.listener.ListenerMap.invokeTargetMethod(ListenerMap.java:257)


--
Øyvind Harboe
http://www.zylin.com

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postedDec 5, '06 at 9:54p
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