NPE in ERXObjectStoreCoordinatorSynchronizer
NPE in ERXObjectStoreCoordinatorSynchronizer
- Subject: NPE in ERXObjectStoreCoordinatorSynchronizer
- From: Paul Hoadley <email@hidden>
- Date: Wed, 19 Oct 2016 13:12:29 +1030
| Hello,
I seem to be starting a number of posts in this way, but… I’m seeing very occasional stack traces from the wild that look like this:
Oct 17 23:10:57 Relief[2002] ERROR er.extensions.eof.ERXObjectStoreCoordinatorSynchronizer - java.lang.NullPointerException
NullPointerException
at com.webobjects.eocontrol.EOCustomObject.willReadRelationship(EOCustomObject.java:1270)
at er.extensions.eof.ERXGenericRecord.willReadRelationship(ERXGenericRecord.java:385)
at com.webobjects.eocontrol._EOMutableKnownKeyDictionary$Initializer$_LazyGenericRecordBinding.valueInObject(_EOMutableKnownKeyDictionary.java:614)
at er.extensions.eof.ERXGenericRecord$TouchingBinding.valueInObject(ERXGenericRecord.java:214)
at com.webobjects.eocontrol.EOCustomObject.storedValueForKey(EOCustomObject.java:1634)
at net.logicsquad.relief.model._Job.classTeacher(_Job.java:192)
... skipped 6 stack elements
at er.extensions.eof.ERXGenericRecord$InverseRelationshipUpdater.includeObjectIntoPropertyWithKey(ERXGenericRecord.java:1367)
at er.extensions.eof.ERXGenericRecord.includeObjectIntoPropertyWithKey(ERXGenericRecord.java:1225)
at net.logicsquad.relief.model._ClassTeacher.addToJobs(_ClassTeacher.java:212)
... skipped 5 stack elements
at com.webobjects.eocontrol.EOCustomObject.addObjectToPropertyWithKey(EOCustomObject.java:940)
at com.webobjects.eocontrol.EOEditingContext._mergeValueForKey(EOEditingContext.java:660)
at com.webobjects.eocontrol.EOEditingContext._mergeObjectWithChanges(EOEditingContext.java:3457)
at com.webobjects.eocontrol.EOEditingContext._processObjectStoreChanges(EOEditingContext.java:3546)
at er.extensions.eof.ERXEC._processObjectStoreChanges(ERXEC.java:1549)
... skipped 5 stack elements
at com.webobjects.eocontrol.EOEditingContext._sendOrEnqueueNotification(EOEditingContext.java:4715)
at com.webobjects.eocontrol.EOEditingContext._objectsChangedInStore(EOEditingContext.java:3562)
at er.extensions.eof.ERXEC._objectsChangedInStore(ERXEC.java:1489)
... skipped 7 stack elements
at com.webobjects.eocontrol.EOObjectStoreCoordinator._objectsChangedInSubStore(EOObjectStoreCoordinator.java:693)
... skipped 7 stack elements
at er.extensions.eof.ERXObjectStoreCoordinatorSynchronizer$ProcessChangesQueue$ToManyUpdateCacheChangeProcessor.processCacheChange(ERXObjectStoreCoordinatorSynchronizer.java:466)
at er.extensions.eof.ERXObjectStoreCoordinatorSynchronizer$ProcessChangesQueue.processRemoteChange(ERXObjectStoreCoordinatorSynchronizer.java:566)
at er.extensions.eof.ERXObjectStoreCoordinatorSynchronizer$ProcessChangesQueue.run(ERXObjectStoreCoordinatorSynchronizer.java:622)
... skipped 1 stack elements
We’re running an app here using ERJGroupsSynchronizer, (very) slightly modified to work in an AWS EC2 environment. The app sees what you’d have to describe as a low level of concurrency. What I assume I’m seeing above is an instance processing an incoming change notification, and hitting an NPE. This is EOCustomObject at 1270:
ec.lockObjectStore();
So some EC has presumably turned to null. What happens next is that that instance seems to see (or at least process) no further change notifications, and its view of the database gets stale in the usual way.
Does anyone want to take a guess at this one?
|
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