How to connect over owlapi to the reasoner RacerPro and get no connectivity errors?

Question

I try to connect to the reasoner Racer. But I get the connectivity error. I know that there are many threads about the following error. I read most of them. But I could not solve this issue. Here is my code:

import com.racersystems.racer.Reasoner;
import com.racersystems.racer.ReasonerFactory;
import org.semanticweb.owlapi.apibinding.OWLManager;
import org.semanticweb.owlapi.model.OWLOntology;
import org.semanticweb.owlapi.model.OWLOntologyCreationException;
import org.semanticweb.owlapi.model.OWLOntologyManager;
import org.semanticweb.owlapi.reasoner.*;

import java.io.File;
public class Test4 {
    public static void main(String[] args) {
         File file=new File("C:\\IdeaProjects\\second\\edo.owl");
         OWLOntologyManager owlOntologyManager=  OWLManager.createOWLOntologyManager();
         OWLOntology owlOntology= null;
         try {
             owlOntology = owlOntologyManager.loadOntologyFromOntologyDocument(file);
             OWLReasoner owlreasoner=new Reasoner.ReasonerFactory().createReasoner(owlOntology);
             System.out.println(owlreasoner.isConsistent());
         } catch (OWLOntologyCreationException e) {
             e.printStackTrace();
     }         
   }
 }

But I get the following error:

 Exception in thread "main" com.racersystems.racer.RacerRuntimeException: java.net.ConnectException: Connection refused: connect

          at com.racersystems.racer.Reasoner.<init>(Unknown Source)

          at com.racersystems.racer.Reasoner$ReasonerFactory.createReasoner(Unknown Source)

          at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

          at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

          at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

          at java.lang.reflect.Method.invoke(Method.java:497)

          at com.intellij.rt.execution.application.AppMain.main(AppMain.java:140)

 Caused by: java.net.ConnectException: Connection refused: connect

          at java.net.DualStackPlainSocketImpl.connect0(Native Method)

          at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)

          at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:345)

          at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)

          at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)

          at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)

          at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)

          at java.net.Socket.connect(Socket.java:589)

          at java.net.Socket.connect(Socket.java:538)

          at java.net.Socket.<init>(Socket.java:434)

          at java.net.Socket.<init>(Socket.java:244)

          at com.racersystems.racer.SocketAdapter.<init>(Unknown Source)

          ... 8 more

The error is generated because of the following row:

  OWLReasoner owlreasoner=new Reasoner.ReasonerFactory().createReasoner(owlOntology);

I have owlapi-bin.jar and racer.jar under the lib in Intellij. I think the Server which is Racer Reasoner must be open on my Computer. Therefore I have Racer and RacerPorter open on my Computer. Many thanks for your help.

Did you get any errors from the Racer server when you started it? Do you have any firewalls running on your machine? — Ignazio, Jul 03 '15 at 08:54
I do not get any Errors from Racer when I start it. But when I run the Java program, after showing the above errors, the execution does not terminate and it is still running. I had to terminate the execution manually by clicking the stop button. Then I can see in the terminal of racer the error: "error during socket Operation: an available Connection was closed by remote host. — javaowlapi, Jul 03 '15 at 14:45
@Ignazio: Firewall and Windows Defender are not running. Shall I change the settings for "allowing the communication of programms through the firewall" under control panel-> System -> Windows firewall? If yes, for Racer or for Intellij? — javaowlapi, Jul 03 '15 at 14:48
Make sure there's only one instance of your program running - if there was one left running by accident, it might have kept your local port busy. — Ignazio, Jul 03 '15 at 14:50

How to connect over owlapi to the reasoner RacerPro and get no connectivity errors?

0 Answers0