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Re: Odd NPE from deep inside EOF
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Re: Odd NPE from deep inside EOF

  • Subject: Re: Odd NPE from deep inside EOF
  • From: Chuck Hill <email@hidden>
  • Date: Thu, 28 Jan 2016 19:03:32 +0000
  • Thread-topic: Odd NPE from deep inside EOF
That is nasty.  While processing this fetch, a snapshot is going missing.  I don’t think we can tell anything else from that stack trace.  It is likely that the cause of this missing snapshot is in another concurrently executing thread.  And it is likely related to an error in snapshot reference counting.

Does your app (or any code in Wonder that it calls) invalidate snapshots?  Are you using ERXGenericRecord’s didUpdate() method to make changes and re-save?  Is your code calling methods in EOAccess/EOControl that might  change snapshots (or fetch or whatever) without locking the OSC?

Chuck


From: <webobjects-dev-bounces+chill=email@hidden> on behalf of Mark Wardle <email@hidden>
Date: Thursday, January 28, 2016 at 3:04 AM
To: WebObjects-Dev <email@hidden>
Subject: Re: Odd NPE from deep inside EOF

Last year, I had an intermittent exception thrown seemingly at random. Something odd is happening from deep within EOF and it isn’t easily reproducible as far as I can tell. 

I now have the full stack trace. Does this look familiar to anyone?

Best wishes,

Mark

java.lang.NullPointerException
  at com.webobjects.eocontrol._EOMutableKnownKeyDictionary.<init>(_EOMutableKnownKeyDictionary.java:106)
  at com.webobjects.eoaccess.EORelationship._foreignKeyForSourceRow(EORelationship.java:1148)
  at com.webobjects.eoaccess.EODatabaseContext._followToManyRelationshipWithFetchSpecification(EODatabaseContext.java:2497)
  at com.webobjects.eoaccess.EODatabaseContext._followFetchSpecification(EODatabaseContext.java:2636)
  at com.webobjects.eoaccess.EODatabaseContext._batchFetchRelationshipForSourceObjectsEditingContext(EODatabaseContext.java:3734)
  at com.webobjects.eoaccess.EODatabaseContext.batchFetchRelationship(EODatabaseContext.java:3816)
  at er.extensions.eof.ERXEOAccessUtilities.batchFetchRelationship(ERXEOAccessUtilities.java:1913)
  at er.extensions.eof.ERXDatabaseContextDelegate.doFetch(ERXDatabaseContextDelegate.java:781)
  at er.extensions.eof.ERXDatabaseContextDelegate.batchFetchToManyFault(ERXDatabaseContextDelegate.java:669)
  at er.extensions.eof.ERXDatabaseContextDelegate.databaseContextShouldFetchArrayFault(ERXDatabaseContextDelegate.java:391)
  at sun.reflect.GeneratedMethodAccessor81.invoke(null:Unknown)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  at java.lang.reflect.Method.invoke(Method.java:483)
  at com.webobjects.foundation.NSSelector._safeInvokeMethod(NSSelector.java:122)
  at com.webobjects.foundation._NSDelegate._perform(_NSDelegate.java:223)
  at com.webobjects.foundation._NSDelegate.perform(_NSDelegate.java:163)
  at com.webobjects.eoaccess.EODatabaseContext._fireArrayFault(EODatabaseContext.java:4236)
  at com.webobjects.eoaccess.EOAccessArrayFaultHandler.completeInitializationOfObject(EOAccessArrayFaultHandler.java:77)
  at com.webobjects.eocontrol._EOCheapCopyMutableArray.willRead(_EOCheapCopyMutableArray.java:39)
  at com.webobjects.eocontrol._EOCheapCopyMutableArray.count(_EOCheapCopyMutableArray.java:99)
  at com.webobjects.eocontrol.EOSortOrdering._sortUsingKeyOrderArray(EOSortOrdering.java:185)
  at com.webobjects.eocontrol.EOSortOrdering.sortedArrayUsingKeyOrderArray(EOSortOrdering.java:249)
  at com.eldrix.rsdb.model._Patient.addresses(_Patient.java:748)
  at com.eldrix.rsdb.model.Patient.addressForDate(Patient.java:289)
  at com.eldrix.rsdb.model.Patient.currentAddress(Patient.java:277)



On 31 Mar 2015, at 22:55, Mark Wardle <email@hidden> wrote:

Thanks Ramsey. Have committed the properties change (yes I did have cleanup=true) so I’ll wait until it happens again! Intermittent and difficult to fathom!

Mark
On 31 Mar 2015, at 17:31, Ramsey Gurley <email@hidden> wrote:

er.extensions.stackTrace.cleanup=true


 
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