#70 NullPointer when running enrichment script

[Jens Lehmann]

Running the the enrichment script in SVN with the following parameters results in a NullPointer (and also timeouts):

-e http://live.dbpedia.org/sparql -r http://dbpedia.org/ontology/language --maxExecutionTimeInSeconds 30

java.lang.NullPointerException
at org.dllearner.core.owl.ObjectProperty.compareTo(ObjectProperty.java:71)
at org.dllearner.core.owl.ObjectProperty.compareTo(ObjectProperty.java:1)
at java.util.TreeMap.put(TreeMap.java:560)
at java.util.TreeSet.add(TreeSet.java:255)
at org.dllearner.kb.sparql.SPARQLTasks.getAllObjectProperties(SPARQLTasks.java:685)
at org.dllearner.algorithms.properties.DisjointObjectPropertyAxiomLearner.start(DisjointObjectPropertyAxiomLearner.java:102)
at org.dllearner.cli.Enrichment.applyLearningAlgorithm(Enrichment.java:506)
at org.dllearner.cli.Enrichment.runObjectPropertyAlgorithms(Enrichment.java:382)
at org.dllearner.cli.Enrichment.start(Enrichment.java:347)
at org.dllearner.cli.Enrichment.main(Enrichment.java:918)