Searched on Google with the first line of a JAVA stack trace?

We can recommend more relevant solutions and speed up debugging when you paste your entire stack trace with the exception message. Try a sample exception.

Recommended solutions based on your search

Solutions on the web

via GitHub by naditina
, 1 year ago
java.lang.NullPointerException: 	at org.semanticweb.elk.util.collections.ArrayHashMap.get(ArrayHashMap.java:203)	at org.semanticweb.elk.util.collections.chains.AbstractChain$1.next(AbstractChain.java:105)	at org.semanticweb.elk.util.collections.chains.AbstractChain$1.next(AbstractChain.java:101)	at org.semanticweb.elk.util.collections.chains.AbstractChain.find(AbstractChain.java:42)	at org.semanticweb.elk.reasoner.indexing.hierarchy.IndexedSubClassOfAxiom$ThisCompositionRule.removeFrom(IndexedSubClassOfAxiom.java:162)	at org.semanticweb.elk.reasoner.indexing.hierarchy.DifferentialIndex.add(DifferentialIndex.java:172)	at org.semanticweb.elk.reasoner.indexing.hierarchy.IndexedSubClassOfAxiom.updateOccurrenceNumbers(IndexedSubClassOfAxiom.java:85)	at org.semanticweb.elk.reasoner.indexing.hierarchy.MainAxiomIndexerVisitor$AxiomOccurrenceUpdateFilter.update(MainAxiomIndexerVisitor.java:384)	at org.semanticweb.elk.reasoner.indexing.hierarchy.MainAxiomIndexerVisitor$AxiomOccurrenceUpdateFilter.visit(MainAxiomIndexerVisitor.java:394)	at org.semanticweb.elk.reasoner.indexing.hierarchy.MainAxiomIndexerVisitor$AxiomOccurrenceUpdateFilter.visit(MainAxiomIndexerVisitor.java:373)	at org.semanticweb.elk.reasoner.indexing.hierarchy.MainAxiomIndexerVisitor.indexSubClassOfAxiom(MainAxiomIndexerVisitor.java:148)	at org.semanticweb.elk.reasoner.indexing.hierarchy.AbstractElkAxiomIndexerVisitor.visit(AbstractElkAxiomIndexerVisitor.java:166)	at org.semanticweb.elk.reasoner.indexing.hierarchy.AbstractElkAxiomIndexerVisitor.visit(AbstractElkAxiomIndexerVisitor.java:63)	at org.semanticweb.elk.owlapi.wrapper.ElkEquivalentClassesAxiomWrap.accept(ElkEquivalentClassesAxiomWrap.java:61)	at org.semanticweb.elk.owlapi.wrapper.ElkClassAxiomWrap.accept(ElkClassAxiomWrap.java:51)	at org.semanticweb.elk.reasoner.indexing.hierarchy.DelegatingElkAxiomVisitor.visit(DelegatingElkAxiomVisitor.java:103)	at org.semanticweb.elk.reasoner.indexing.hierarchy.DelegatingElkAxiomVisitor.visit(DelegatingElkAxiomVisitor.java:74)	at org.semanticweb.elk.owlapi.wrapper.ElkEquivalentClassesAxiomWrap.accept(ElkEquivalentClassesAxiomWrap.java:61)	at org.semanticweb.elk.owlapi.wrapper.ElkClassAxiomWrap.accept(ElkClassAxiomWrap.java:51)	at org.semanticweb.elk.reasoner.indexing.hierarchy.ChangeIndexingProcessor.visit(ChangeIndexingProcessor.java:57)	at org.semanticweb.elk.owlapi.OwlOntologyChangeProcessorVisitor.visit(OwlOntologyChangeProcessorVisitor.java:78)	at org.semanticweb.elk.owlapi.OwlOntologyChangeProcessorVisitor.visit(OwlOntologyChangeProcessorVisitor.java:39)	at org.semanticweb.owlapi.model.AddAxiom.accept(AddAxiom.java:76)	at org.semanticweb.elk.owlapi.OwlChangesLoader.load(OwlChangesLoader.java:90)	at org.semanticweb.elk.reasoner.stages.AxiomLoadingStage.executeStage(AxiomLoadingStage.java:121)	at org.semanticweb.elk.reasoner.stages.AbstractReasonerStage.execute(AbstractReasonerStage.java:165)	at org.semanticweb.elk.reasoner.stages.AxiomLoadingStage.execute(AxiomLoadingStage.java:45)	at org.semanticweb.elk.reasoner.stages.LoggingStageExecutor.execute(LoggingStageExecutor.java:53)	at org.semanticweb.elk.reasoner.stages.AbstractStageExecutor.complete(AbstractStageExecutor.java:55)	at org.semanticweb.elk.reasoner.stages.AbstractReasonerState.complete(AbstractReasonerState.java:145)	at org.semanticweb.elk.reasoner.stages.AbstractReasonerState.loadAxioms(AbstractReasonerState.java:306)	at org.semanticweb.elk.reasoner.stages.AbstractReasonerState.isInconsistent(AbstractReasonerState.java:284)	at org.semanticweb.elk.reasoner.stages.AbstractReasonerState.getTaxonomy(AbstractReasonerState.java:324)	at org.semanticweb.elk.owlapi.ElkReasoner.precomputeInferences(ElkReasoner.java:942)	at simplification.ConceptMinimizer.computeConjunctions(ConceptMinimizer.java:254)