Re: Jena Rules and OSGI

Dave Reynolds Fri, 07 Nov 2014 09:11:48 -0800

I don't know of a reason why jena rules shouldn't work under OSGI.

You are creating your file in java.io.tmpdir then reading it from /tmpso if java.io.tmpdir is different under your OSGI runner that would havean effect.

I would debug by reducing the number of moving parts. Created a simplerexample which just passes the rule in as a string (no reading/writing tofiles), runs over a memory model (no SDB) and see if that works underyour OSGI set up.


Dave

On 07/11/14 11:14, Iturraspe Barturen, Urtza wrote:

Good morning,

I am working with Jena SDB and OSGI, developing with Eclipse and Bnd Tools 
plugin.

I want to execute a Jena rule and include infModel to JenaSDB Model, but It 
doesn't work in a REST service using OSGI.

I have tested the code and it's works well if I don't use this in a OSGI bundle 
...

I've create OSGI bundle for this versions of jars:

com.mysql.jdbc-5.1.22.jar
slf4j.log4j12-1.6.4.jar
xml-apis-1.4.1.jar
xercesImpl-2.10.0.jar
com.ibm.icu-54.1.1.jar
com.hp.hpl.jena.iri-0.8.0.jar
com.hp.hpl.jena.jena-2.6.4.jar
com.hp.hpl.jena.arq-2.8.7.jar
org.apache.jena.jena-iri-0.9.6.jar
com.hp.hpl.jena.sdb-1.3.4.jar
org.apache.jena.jena-core-2.7.4.jar


Any help, idea ?

The jena rule is very simple:

@prefix places: http://purl.org/ontology/places#
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>.
@prefix owl2: <http://www.w3.org/2006/12/owl2#>.
@prefix owl: <http://www.w3.org/2002/07/owl#>.
@prefix xsd: <http://www.w3.org/2001/XMLSchema#>.
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>.
[AddingContinent: ->(places:XXX rdf:type places:Continent)]


I have this code:

   Model modelSDB = null;
   InfModel owlInfModel = null;
   InfModel rulesInfModel = null;

modelSDB = jenaSDBConector.loadModelSDB(databaseName);

   File file = new File(System.getProperty("java.io.tmpdir", 
null),"jena.rules");
     try{
     if (!file.exists()) {
       file.createNewFile();
     }
     }catch(Exception e){
       System.out.println(e.getMessage());
     }
     // get the content in bytes
     byte[] contentInBytes = jenaRule.getBytes();
     FileOutputStream  fop = new FileOutputStream(file);
     fop.write(contentInBytes);
     fop.flush();
     fop.close();

     Reasoner reasoner = ReasonerRegistry.getOWLReasoner();
     owlInfModel = ModelFactory.createInfModel(reasoner, modelSDB);


     Resource conf = modelSDB.createResource();
     conf.addProperty(ReasonerVocabulary.PROPruleMode, "forwardRETE");
     conf.addProperty(ReasonerVocabulary.PROPruleSet, "/tmp/" + "jena.rules");

      reasoner = GenericRuleReasonerFactory.theInstance().create(conf);
     rulesInfModel = ModelFactory.createInfModel(reasoner, modelSDB);
     rulesInfModel.prepare();



     Model deductionModel = rulesInfModel.getDeductionsModel();   -> DEDUCTION 
MODEL IS EMPTY !!!!!!???????

     StmtIterator i = deductionModel.listStatements();
     while (i.hasNext()) {
         System.out.println(" - " + i.nextStatement() + "\n");
     }


     modelSDB.add(rulesInfModel);
     modelSDB.commit();
     bResult=true;



Thanks in advance

Urtza Iturraspe

OPTIMA - Optimization Modelling & Analytics Area

ICT - European Software Institute Division

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Re: Jena Rules and OSGI

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