[Pellet-users] OWL API - URL error

[sjtirtha]

 Hi,

I'm using now java api to test the swrl features in pellet.
But I get error on
OWLClass human = reasoner.getClass(URI.*create*(
http://www.w3c.org/swrl/family.owl#human));

The error:

Exception in thread "main" *java.lang.NullPointerException
*

at org.mindswap.pellet.owlapi.Reasoner.getEntity(*Reasoner.java:491*)

at org.mindswap.pellet.owlapi.Reasoner.getClass(*Reasoner.java:471*)

at test.SWRLTest.main(*SWRLTest.java:55*)
Do I use the wrong url ? I defined http://www.w3c.org/swrl/family.owl#human as
xmlns in file:src/family_rules.owl .

Code:
##############################################################################################

String OWL_OBJ = "file:src/family_rules.owl";

 *try* {

System.*out*.println("Reading file " + OWL_OBJ + "...");

Reasoner reasoner = *new* Reasoner();

OWLOntologyManager manager = OWLManager.*createOWLOntologyManager*();

OWLOntology ontology = manager.loadOntology(URI.*create*(OWL_OBJ));

reasoner.loadOntologies(ontology);

 reasoner.getKB().realize();

reasoner.getKB().printClassTree();

 OWLClass human = reasoner.getClass(URI.*create*(
http://www.w3c.org/swrl/family.owl#human));

OWLObjectProperty hasUncle = reasoner.getObjectProperty(URI.*create*("
http://www.w3c.org/swrl/family.owl#hasUncle"));

OWLObjectProperty hasAunt = reasoner.getObjectProperty(URI.*create*("
http://www.w3c.org/swrl/family.owl#hasAunt"));
##############################################################################################


steve
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