Java error message is: log4j:WARN No appenders could be found for logger (com.hp.hpl.jena.sparql.mgt.ARQMgt). log4j:WARN Please initialize the log4j system properly. log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info. Classifying 784 elements Classifying: 0% complete in 00:00 Classifying: 1% complete in 00:00 Classifying: 2% complete in 00:00 Classifying: 3% complete in 00:00 Classifying: 4% complete in 00:00 Classifying: 5% complete in 00:00 Classifying: 6% complete in 00:00 Classifying: 7% complete in 00:00 Classifying: 8% complete in 00:00 Classifying: 9% complete in 00:01 Classifying: 10% complete in 00:02 Classifying: 11% complete in 00:02 Classifying: 12% complete in 00:02 Classifying: 13% complete in 00:02 Classifying: 14% complete in 00:04 Classifying: 15% complete in 00:04 Classifying: 16% complete in 00:04 Classifying: 17% complete in 00:05 Classifying: 18% complete in 00:05 Classifying: 19% complete in 00:05 Classifying: 20% complete in 00:05 Classifying: 21% complete in 00:05 Classifying: 22% complete in 00:05 Classifying: 23% complete in 00:05 Classifying: 24% complete in 00:05 Classifying: 25% complete in 00:05 Classifying: 26% complete in 00:05 Classifying: 27% complete in 00:05 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Classifying: 85% complete in 00:19 Classifying: 86% complete in 00:19 Classifying: 87% complete in 00:21 Classifying: 88% complete in 00:21 Classifying: 89% complete in 00:28 Classifying: 90% complete in 00:39 Classifying: 91% complete in 00:43 Classifying: 92% complete in 00:47 Classifying: 93% complete in 00:48 Classifying: 94% complete in 00:48 Classifying: 95% complete in 00:49 Classifying: 96% complete in 00:55 Classifying: 97% complete in 00:55 Classifying: 98% complete in 00:55 Classifying: 99% complete in 00:55 Classifying: 100% complete in 00:56 Classifying finished in 00:56 Realizing 784 elements Realizing: 0% complete in 00:00 Realizing: 1% complete in 00:00 Realizing: 2% complete in 00:00 Realizing: 3% complete in 00:00 Realizing: 4% complete in 00:00 Realizing: 5% complete in 00:00 Realizing: 6% complete in 00:00 Realizing: 7% complete in 00:00 Realizing: 8% complete in 00:00 Realizing: 9% complete in 00:00 Realizing: 10% complete in 00:00 Realizing: 11% complete in 00:00 Realizing: 12% complete in 00:00 Realizing: 13% complete in 00:00 Realizing: 14% complete in 00:00 Realizing: 15% complete in 00:00 Realizing: 16% complete in 00:00 Realizing: 17% complete in 00:00 Realizing: 18% complete in 00:00 Realizing: 19% complete in 00:00 Realizing: 20% complete in 00:00 Realizing: 21% complete in 00:00 Realizing: 22% complete in 00:00 Realizing: 23% complete in 00:00 Realizing: 24% complete in 00:00 Realizing: 25% complete in 00:00 Realizing: 26% complete in 00:00 Realizing: 27% complete in 00:00 Realizing: 28% complete in 00:00 Realizing: 29% complete in 00:00 Realizing: 30% complete in 00:00 Realizing: 31% complete in 00:00 Realizing: 32% complete in 00:00 Realizing: 33% complete in 00:00 Realizing: 34% complete in 00:00 Realizing: 35% complete in 00:00 Realizing: 36% complete in 00:00 Realizing: 37% complete in 00:00 Realizing: 38% complete in 00:00 Realizing: 39% complete in 00:00 Realizing: 40% complete in 00:00 Realizing: 41% complete in 00:01 Realizing: 42% complete in 00:02 Realizing: 43% complete in 00:02 Realizing: 44% complete in 00:02 Realizing: 45% complete in 00:02 Realizing: 46% complete in 00:02 Realizing: 47% complete in 00:02 Realizing: 48% complete in 00:02 Realizing: 49% complete in 00:02 Realizing: 50% complete in 00:02 Realizing: 51% complete in 00:02 Realizing: 52% complete in 00:02 Realizing: 53% complete in 00:02 Realizing: 54% complete in 00:02 Realizing: 55% complete in 00:02 Realizing: 56% complete in 00:02 Realizing: 57% complete in 00:02 Realizing: 58% complete in 00:02 Realizing: 59% complete in 00:02 Realizing: 60% complete in 00:02 Realizing: 61% complete in 00:02 Realizing: 62% complete in 00:02 Realizing: 63% complete in 00:02 Realizing: 100% complete in 00:00 Realizing finished in 00:02 Exception in thread "main" java.lang.NullPointerException at com.clarkparsia.pellet.datatypes.DatatypeReasonerImpl.isSatisfiable(DatatypeReasonerImpl.java:809) at com.clarkparsia.pellet.datatypes.DatatypeReasonerImpl.isSatisfiable(DatatypeReasonerImpl.java:1023) at org.mindswap.pellet.tableau.completion.rule.DataSatisfiabilityRule.apply(DataSatisfiabilityRule.java:118) at org.mindswap.pellet.tableau.completion.rule.AbstractTableauRule.apply(AbstractTableauRule.java:64) at org.mindswap.pellet.tableau.completion.SROIQStrategy.complete(SROIQStrategy.java:157) at org.mindswap.pellet.ABox.isConsistent(ABox.java:1423) at org.mindswap.pellet.ABox.isType(ABox.java:852) at org.mindswap.pellet.KnowledgeBase.partitionInstanceRetrieval(KnowledgeBase.java:4332) at org.mindswap.pellet.KnowledgeBase.binaryInstanceRetrieval(KnowledgeBase.java:4322) at org.mindswap.pellet.KnowledgeBase.getObjectPropertyValues(KnowledgeBase.java:4001) at pellet.PelletRealize.run(PelletRealize.java:95) at pellet.Pellet.run(Pellet.java:105) at pellet.Pellet.main(Pellet.java:59)