Generic rule reasoner not working

[Lior Barnea]

Hi all,

I tried to run the GenericRuleReasoner example I found in the "Jena 2 interface 
support page" and I get no results from the reasoner.

Following is my code:

            PrintUtil.registerPrefix("eg", "urn:x-hp:eg/");

            Model model = ModelFactory.createDefaultModel();

            model.setNsPrefix("eg", "urn:x-hp:eg/");

            Statement st;
            Property p = model.createProperty("eg:p");
            Resource objA = model.createResource("eg:A");
            Resource objB = model.createResource("eg:B");
            Resource objC = model.createResource("eg:C");
            Resource objD = model.createResource("eg:D");

            st = model.createStatement(objA, p, objB );
            model.add(st);


            st = model.createStatement(objB, p, objC );
            model.add(st);


            st = model.createStatement(objC, p, objD );
            model.add(st);

            String rules = "[rule1: (?a eg:p ?b) (?b eg:p ?c) -> (?a eg:p ?c)]";

            GenericRuleReasoner reasoner = new 
GenericRuleReasoner(Rule.parseRules(rules));

            reasoner.setDerivationLogging(true);
            reasoner.setTraceOn(true);

            InfModel inf = ModelFactory.createInfModel(reasoner, model);

            PrintWriter out = new PrintWriter(System.out);
          for (StmtIterator i = inf.listStatements(objA, p, objD); i.hasNext(); 
) {
              Statement s = i.nextStatement();
              System.out.println("Statement is " + s);
              for (Iterator<Derivation> id = inf.getDerivation(s); 
id.hasNext(); ) {
                  Derivation deriv = (Derivation) id.next();
                  deriv.printTrace(out, true);
              }
          }
          out.flush();


Help please ?

Thanks in advance,
Lior Barnea.

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