java - Jena NoReaderForLangException: owl -


my problem jena when use turtle ontolgy works fine , when use other ontology owl or rdfs show same error

exception in thread "main" com.hp.hpl.jena.shared.noreaderforlangexception: owl @ com.hp.hpl.jena.rdf.model.impl.rdfreaderfimpl.getreader(rdfreaderfimpl.java:110) @ com.hp.hpl.jena.rdf.model.impl.modelcom.read(modelcom.java:225) @ com.hp.hpl.jena.ontology.impl.ontmodelimpl.read(ontmodelimpl.java:2169) @ symenticweb.symenticweb.main(symenticweb.java:109) java result: 1

line no 109 model.read(inputstream, null, inputfileformat);

my code 

package symenticweb;  import java.io.fileinputstream; import java.io.filenotfoundexception; import java.io.printwriter; import java.util.iterator;  import org.mindswap.pellet.jena.pelletreasonerfactory;  import com.hp.hpl.jena.ontology.individual; import com.hp.hpl.jena.ontology.ontmodel; import com.hp.hpl.jena.ontology.ontmodelspec; import com.hp.hpl.jena.rdf.model.model; import com.hp.hpl.jena.rdf.model.modelfactory; import com.hp.hpl.jena.rdf.model.statement; import com.hp.hpl.jena.rdf.model.stmtiterator; import com.hp.hpl.jena.reasoner.reasoner; import com.hp.hpl.jena.reasoner.validityreport; import com.hp.hpl.jena.util.iterator.extendediterator;  public class symenticweb {    /**     * program takes 4 parameters input file name      * output file name input file format reasoning      * level {rdfs, owl-dl}     */    public static void main(string[] args)    {        //validate program arguments //      if(args.length != 4)  //      {    //         system.err.println("usage: java inferenceexample " //            + "<input file> <input format> <output file> " //            + "<none|rdfs|owl>"); //         return; //      }        string inputfilename;        inputfilename = "c:\\users\\harjinder\\documents\\netbeansprojects\\symenticweb\\src\\test\\abc.owl";       string inputfileformat = "owl";       string outputfilename = "c:\\new folder\\abc.txt";       string reasoninglevel = "none";        //create input stream input file       fileinputstream inputstream = null;       printwriter writer = null;       try        {          inputstream = new fileinputstream(inputfilename);       } catch (filenotfoundexception e) {          system.err.println("'" + inputfilename              + "' invalid input file.");          return;       }        //create output print writer results       try        {          writer = new printwriter(outputfilename);       } catch (filenotfoundexception e) {          system.err.println("'" + outputfilename              + "' invalid output file.");          return;       }        //create appropriate jena model       ontmodel model = null;       if("none".equals(reasoninglevel.tolowercase()))       {          /*           * "none" jena model owl_dl           * ontologies loaded , no inference enabled           */          model = modelfactory.createontologymodel(             ontmodelspec.owl_dl_mem);       }       else if("rdfs".equals(reasoninglevel.tolowercase()))       {          /*           * "rdfs" jena model owl_dl           * ontologies loaded , rdfs inference enabled            */          model = modelfactory.createontologymodel(             ontmodelspec.owl_dl_mem_rdfs_inf);        }       else if("owl".equals(reasoninglevel.tolowercase()))       {          /*           * "owl" jena model owl_dl ontologies           * wrapped around pellet-based inference model           */          reasoner reasoner =              pelletreasonerfactory.theinstance().create();          model infmodel = modelfactory.createinfmodel(             reasoner, modelfactory.createdefaultmodel());          model = modelfactory.createontologymodel(             ontmodelspec.owl_dl_mem, infmodel);       }       else       {          //invalid inference setting          system.err.println("invalid inference setting, "             + "choose 1 of <none|rdfs|owl>.");          return;       }        //load facts model       model.read(inputstream, null, inputfileformat);        //validate file       validityreport validityreport = model.validate();       if(validityreport != null && !validityreport.isvalid())       {          iterator = validityreport.getreports();          while(i.hasnext())          {             system.err.println(                ((validityreport.report)i.next()).getdescription());          }          return;       }        //iterate on individuals, print statements them       extendediterator iindividuals = model.listindividuals();       while(iindividuals.hasnext())       {          individual = (individual)iindividuals.next();          printindividual(i, writer);       }       iindividuals.close();        writer.close();       model.close();    }     /**     * print information individual     * @param individual output     * @param writer writer output     */    public static void printindividual(       individual i, printwriter writer)    {       //print local name of individual (to keep terse)       writer.println("individual: " + i.getlocalname());        //print statements individual       stmtiterator iproperties = i.listproperties();       while(iproperties.hasnext())       {          statement s = (statement)iproperties.next();          writer.println("  " + s.getpredicate().getlocalname()              + " : " + s.getobject().tostring());       }       iproperties.close();       writer.println();    } }

owl can serialized rdf, , rdf can serialized in number of different formats. jena rdf-based tool, , you'll need have rdf serialization of ontology in order jena able read it.

fortunately, files ending in .owl typically (though not always) rdf/xml serializations of rdf encoding of owl ontology. haven't shown ontology, can't sure yet, likely, if change

string inputfileformat = "owl";

to 

string inputfileformat = "rdf/xml";

you'll fine. (this assuming .owl file rdf/xml.)


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