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Re: [eclipselink-users] one-to-many: NullPointerException cause rollback 
Hi Antonio,

  What version of EclipseLink are you using?
Can you give me an idea of what is happening in: BatchLoadWorldCheck.loadWCLists? What objects are involved? How are they mapped? 

-Tom

On 13/04/2012 9:02 AM, Antonino Vitale wrote:

Hi everybody,
I'm using Eclipselink as JPA provider for my application.
I have many classes generated from a xml schema using hyperjaxb3.
I have annotations for both jpa and xml elements.
my classes have one-to-many relationships, for example a class person has a
relationship with a class names and a class record has a relationship with
person etc...
the problem is that i get a nullpointerexception during committing changes to
database.
this is the stacktrace:

Exception in thread "main" javax.persistence.
RollbackException: java.lang.NullPointerException
     at
org.eclipse.persistence.internal.jpa.transaction.EntityTransactionImpl.commitInternal(EntityTransactionImpl.java:102)
     at
org.eclipse.persistence.internal.jpa.transaction.EntityTransactionImpl.commit(EntityTransactionImpl.java:63)
     at BatchLoadWorldCheck.loadWCLists(BatchLoadWorldCheck.java:428)
     at BatchLoadWorldCheck.main(BatchLoadWorldCheck.java:137)
Caused by: java.lang.NullPointerException
     at
org.eclipse.persistence.internal.descriptors.ObjectBuilder.extractValueFromObjectForField(ObjectBuilder.java:2565)[EL
Warning]: 2012-04-12
14:58:45.918--UnitOfWork(18164750)--java.lang.NullPointerException

     at
org.eclipse.persistence.mappings.OneToManyMapping.updateTargetRowPostInsertSource(OneToManyMapping.java:1337)
     at
org.eclipse.persistence.mappings.OneToManyMapping.performDataModificationEvent(OneToManyMapping.java:900)
     at
org.eclipse.persistence.internal.sessions.CommitManager.commitAllObjectsWithChangeSet(CommitManager.java:157)
     at
org.eclipse.persistence.internal.sessions.AbstractSession.writeAllObjectsWithChangeSet(AbstractSession.java:3799)
     at
org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.commitToDatabase(UnitOfWorkImpl.java:1415)
     at
org.eclipse.persistence.internal.sessions.RepeatableWriteUnitOfWork.commitToDatabase(RepeatableWriteUnitOfWork.java:636)
     at
org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.commitToDatabaseWithChangeSet(UnitOfWorkImpl.java:1505)
     at
org.eclipse.persistence.internal.sessions.RepeatableWriteUnitOfWork.commitRootUnitOfWork(RepeatableWriteUnitOfWork.java:267)
     at
org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.commitAndResume(UnitOfWorkImpl.java:1143)
     at
org.eclipse.persistence.internal.jpa.transaction.EntityTransactionImpl.commitInternal(EntityTransactionImpl.java:84)
     ... 3 more

using hibernate as jpa provider all goes well. I thought to move to eclipselink
because of a huge number of load operations that in hibernate make my
application slower.
if you know the answer, please help me! I'm really confused about this error and
I'm new to this kind of things so I can not find solutions.
thank you very much.
bye

Nino


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