java.lang.NullPointerException

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    • 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)
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