Der tl:KBDataProducerTask erstellt eine künstliche UpdateChainLink-Kette um seine Session in die zu verarbeitene Revision zu setzen. Der tl:UpdateChainLink der letzten KnowledgBase-Revision hat keinen Nachfolger.

Werden während der Verarbeitung in der tl:KnowledgeBase weitere Änderungen committet, kann es dazu kommen, dass versucht wird den nächsten UpdateChainLink zu navigieren. Dies führt zu einer NullPointerException:

Stacktrace

java.lang.NullPointerException
	at com.top_logic.knowledge.service.db2.DBKnowledgeBase.registerForCleanup(DBKnowledgeBase.java:5303)
	at com.top_logic.knowledge.service.db2.DBKnowledgeItem.updateWithOlderValues(DBKnowledgeItem.java:774)
	at com.top_logic.knowledge.service.db2.DBKnowledgeItem.updateValues(DBKnowledgeItem.java:730)
	at com.top_logic.knowledge.service.db2.DBKnowledgeItem.updateDataForRevision(DBKnowledgeItem.java:370)
	at com.top_logic.knowledge.service.db2.DBKnowledgeItem.findValues(DBKnowledgeItem.java:329)
	at com.top_logic.knowledge.service.db2.DBKnowledgeItem.valuesAlive(DBKnowledgeItem.java:585)
	at com.top_logic.knowledge.service.db2.DBKnowledgeBase.syncCacheLookupCache(DBKnowledgeBase.java:1415)
	at com.top_logic.knowledge.service.db2.DBKnowledgeBase.cleanupAndLookupCache(DBKnowledgeBase.java:5107)
	at com.top_logic.knowledge.service.db2.DBKnowledgeBase.getCachedKey(DBKnowledgeBase.java:5095)
	at com.top_logic.knowledge.service.db2.AbstractDBKnowledgeItem.getKnownKey(AbstractDBKnowledgeItem.java:125)
	at com.top_logic.knowledge.KnowledgeReferenceStorageImpl.loadObjectKey(KnowledgeReferenceStorageImpl.java:328)
	at com.top_logic.knowledge.ByIDReferenceStorageImpl.fetchValue(ByIDReferenceStorageImpl.java:88)
	at com.top_logic.dob.attr.storage.AbstractMOAttributeStorageImpl.loadValue(AbstractMOAttributeStorageImpl.java:73)
	at com.top_logic.knowledge.service.db2.AbstractDBKnowledgeItem.loadAttributeValues(AbstractDBKnowledgeItem.java:277)
	at com.top_logic.knowledge.service.db2.DBKnowledgeItem.refetch(DBKnowledgeItem.java:687)
	at com.top_logic.knowledge.service.db2.DBKnowledgeBase.findOrCreateItem(DBKnowledgeBase.java:5238)
	at com.top_logic.knowledge.service.db2.DBKnowledgeBase.findOrCreateItem(DBKnowledgeBase.java:5194)
	at com.top_logic.knowledge.service.db2.MonomorphicSearch$FullObjectResult.findNext(MonomorphicSearch.java:322)
	at com.top_logic.knowledge.service.db2.MonomorphicSearch$FullObjectResult.getAll(MonomorphicSearch.java:301)
	at com.top_logic.knowledge.service.db2.MonomorphicSearch.search(MonomorphicSearch.java:73)
	at com.top_logic.knowledge.search.AbstractCompiledQuery.search(AbstractCompiledQuery.java:70)
	at com.top_logic.knowledge.service.db2.AbstractAssociationQuery.search(AbstractAssociationQuery.java:147)
	at com.top_logic.knowledge.service.db2.AssociationCache.query(AssociationCache.java:318)
	at com.top_logic.knowledge.service.db2.AssociationCache.getOrCreateGlobalCache(AssociationCache.java:124)
	at com.top_logic.knowledge.service.db2.AssociationCache.lookup(AssociationCache.java:67)
	at com.top_logic.knowledge.service.db2.AssociationCache.getLinksDirect(AssociationCache.java:53)
	at com.top_logic.knowledge.service.db2.DBKnowledgeBase.resolveLinks(DBKnowledgeBase.java:4257)
	at com.top_logic.knowledge.service.AssociationQueryUtil.resolveWrappers(AssociationQueryUtil.java:54)
	at com.top_logic.knowledge.wrap.AbstractWrapper.resolveWrappersTyped(AbstractWrapper.java:997)
	at com.top_logic.knowledge.wrap.AbstractWrapper.resolveWrappersTyped(AbstractWrapper.java:968)
	at com.top_logic.contact.business.PersonContact.getPerson(PersonContact.java:147)
[siehe Anhang für die restlichen Stackframes]

Test

Nicht stabil reproduzierbar.