Inferencing NullPointerException

[Samuel Zweifel]

Hi all,

When I try to run inferences on my ontology I get an exception in the inference engine:

eclipse.buildId=unknown
java.version=1.8.0_91
java.vendor=Oracle Corporation
BootLoader constants: OS=linux, ARCH=x86_64, WS=gtk, NL=en_US
Command-line arguments:  -os linux -ws gtk -arch x86_64
org.topbraidcomposer.core
Error
Tue May 03 10:49:17 PDT 2016
Could not execute inferences
java.lang.reflect.InvocationTargetException
at org.topbraidcomposer.inference.change.InferenceChange.run(InferenceChange.java:106)
at org.topbraidcomposer.inference.change.InferenceChange.execute(InferenceChange.java:58)
at org.topbraid.core.change.ChangeOperation.execute(ChangeOperation.java:105)
at org.eclipse.core.commands.operations.DefaultOperationHistory.execute(DefaultOperationHistory.java:516)
at org.topbraid.core.change.AbstractChangeEngine.execute(AbstractChangeEngine.java:272)
at org.topbraidcomposer.core.change.TBCChangeEngine.access$0(TBCChangeEngine.java:1)
at org.topbraidcomposer.core.change.TBCChangeEngine$2.run(TBCChangeEngine.java:155)
at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:119)
Caused by: java.lang.NullPointerException
at org.topbraid.sparql.pfunctions.internal.qa.DefinesStatements.exec(DefinesStatements.java:134)
at com.hp.hpl.jena.sparql.pfunction.PropertyFunctionBase$RepeatApplyIteratorPF.nextStage(PropertyFunctionBase.java:108)
at com.hp.hpl.jena.sparql.engine.iterator.QueryIterRepeatApply.makeNextStage(QueryIterRepeatApply.java:115)
at com.hp.hpl.jena.sparql.engine.iterator.QueryIterRepeatApply.hasNextBinding(QueryIterRepeatApply.java:67)
at com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorBase.hasNext(QueryIteratorBase.java:112)
at com.hp.hpl.jena.sparql.engine.iterator.QueryIterProcedure.hasNextBinding(QueryIterProcedure.java:74)
at com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorBase.hasNext(QueryIteratorBase.java:112)
at com.hp.hpl.jena.sparql.engine.iterator.QueryIterRepeatApply.makeNextStage(QueryIterRepeatApply.java:108)
at com.hp.hpl.jena.sparql.engine.iterator.QueryIterRepeatApply.hasNextBinding(QueryIterRepeatApply.java:67)
at com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorBase.hasNext(QueryIteratorBase.java:112)
at com.hp.hpl.jena.sparql.engine.iterator.QueryIterBlockTriples.hasNextBinding(QueryIterBlockTriples.java:64)
at com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorBase.hasNext(QueryIteratorBase.java:112)
at com.hp.hpl.jena.sparql.engine.iterator.QueryIterRepeatApply.makeNextStage(QueryIterRepeatApply.java:108)
at com.hp.hpl.jena.sparql.engine.iterator.QueryIterRepeatApply.hasNextBinding(QueryIterRepeatApply.java:67)
at com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorBase.hasNext(QueryIteratorBase.java:112)
at com.hp.hpl.jena.sparql.engine.iterator.QueryIterProcessBinding.hasNextBinding(QueryIterProcessBinding.java:60)
at com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorBase.hasNext(QueryIteratorBase.java:112)
at com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorWrapper.hasNextBinding(QueryIteratorWrapper.java:40)
at com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorBase.hasNext(QueryIteratorBase.java:112)
at com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorWrapper.hasNextBinding(QueryIteratorWrapper.java:40)
at com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorBase.hasNext(QueryIteratorBase.java:112)
at org.apache.jena.atlas.iterator.Iter$5.hasNext(Iter.java:353)
at com.hp.hpl.jena.sparql.engine.QueryExecutionBase.execConstruct(QueryExecutionBase.java:228)
at com.hp.hpl.jena.sparql.engine.QueryExecutionBase.execConstruct(QueryExecutionBase.java:204)
at org.topbraid.sparql.LockOptimizedQueryExecution.execConstruct(LockOptimizedQueryExecution.java:147)
at org.topbraid.spin.inference.SPINInferences.runCommandOnClass(SPINInferences.java:316)
at org.topbraid.spin.inference.SPINInferences.run(SPINInferences.java:242)
at org.topbraid.spin.sparqlmotion.modules.impl.ApplyTopSPINModule.addNewTriples(ApplyTopSPINModule.java:121)
at org.topbraid.spintb.inference.SPINInferenceEngine.addTriples(SPINInferenceEngine.java:80)
at org.topbraid.inference.change.AbstractInferenceChange.runReallyNow(AbstractInferenceChange.java:168)
at org.topbraid.inference.change.AbstractInferenceChange.runReally(AbstractInferenceChange.java:131)
at org.topbraidcomposer.inference.change.InferenceChange.access$0(InferenceChange.java:1)
at org.topbraidcomposer.inference.change.InferenceChange$3.run(InferenceChange.java:90)
at java.lang.Thread.run(Thread.java:745)

 

Does anyone have an idea what may cause this error? I get exactly the same error also from the plugin "org.topbraidcomposer.spin".

Thanks in advance.

Regards,

Samuel

[Holger Knublauch]

Hi Samuel,

your rules seem to use the magic property tops:definesStatements, which only works when you have a file open in TBC, because it needs to access the currently active query graph. Try to avoid using this magic property.

HTH
Holger

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[Samuel Zweifel]

Thanks Holger! This resolved the issue.