Christian Bay created JENA-1415:
-----------------------------------
Summary: ConversionException for individuals
Key: JENA-1415
URL: https://issues.apache.org/jira/browse/JENA-1415
Project: Apache Jena
Issue Type: Bug
Components: ARQ, Jena
Affects Versions: Jena 3.4.0
Environment: Linux, Maven, Openllet Reasoner
Reporter: Christian Bay
Priority: Minor
Hey there,
I'm getting a _ConversionException_ when converting a resource to an individual
by using _as_. In another bugreport
[https://issues.apache.org/jira/browse/JENA-1380] this exception occured
because of lacking OWL2 support. Is it something similiar here? Below is the
relevant part of the OWL File:
{code:xml}
<!-- http://www8.cs.fau.de/research:cgm/schizophrenia#R_AcuteSchizophrenia
-->
<owl:NamedIndividual
rdf:about="http://www8.cs.fau.de/research:cgm/schizophrenia#R_AcuteSchizophrenia";>
<rdf:type
rdf:resource="http://www8.cs.fau.de/research:cgm/schizophrenia#AcuteSchizophrenia"/>
</owl:NamedIndividual>
{code}
The code snippet sets up a query on a OntModel which uses the Openllet
reasoner.
{code:java}
private ArrayList<String> queryForRecommended(Query query){;
OntDocumentManager mgr = new OntDocumentManager();
//imports
mgr.addAltEntry(Misc.STR_TIME,Misc.PATH_TIME);
mgr.addAltEntry(Misc.STR_SCHIZO,Misc.PATH_SCHIZO);
// Create OntModel
OntModelSpec s = new
OntModelSpec(PelletReasonerFactory.THE_SPEC);
s.setDocumentManager(mgr);
OntModel ontModel = ModelFactory.createOntologyModel(s);
try{
ontModel.read(patient.getFile().toURI().toString());
}catch(Exception e){
e.printStackTrace();
return null;
}
QueryExecution qe = QueryExecutionFactory.create(query,
ontModel);
ResultSet rs = qe.execSelect();
ArrayList<String> result = new ArrayList<String>();
while(rs.hasNext()){
QuerySolution qs = rs.next();
// ------- ERROR ---------
Individual in =
qs.getResource("diag").as(Individual.class);
ExtendedIterator it = in.listOntClasses(true);
String className = "";
while(it.hasNext()){
className = it.next().toString();
}
result.add(className);
}
qe.close();
return result;
}
{code}
This is the error message I'm getting. The Jena Api mention the following: 'In
order to be recognised as an individual, rather than a generic resource, at
least one rdf:type statement' .
But a rdf:type statement does exist. I'm a bit clueless.
{code}
Exception in thread "main" org.apache.jena.ontology.ConversionException: Cannot
convert node
http://www8.cs.fau.de/research:cgm/schizophrenia#R_AcuteSchizophrenia to
Individual
at
org.apache.jena.ontology.impl.IndividualImpl$1.wrap(IndividualImpl.java:61)
at org.apache.jena.enhanced.EnhNode.convertTo(EnhNode.java:152)
at org.apache.jena.enhanced.EnhNode.convertTo(EnhNode.java:31)
at org.apache.jena.enhanced.Polymorphic.asInternal(Polymorphic.java:62)
at org.apache.jena.enhanced.EnhNode.as(EnhNode.java:107)
at gui.OWLHandler.queryForRecommended(OWLHandler.java:655)
[...]
{code}
It is worth mentioning that I'm refactoring this code and it worked quite well
with the Jena version 2.1.0 and the Pellet Reasoner for Owlapiv3.
--
This message was sent by Atlassian JIRA
(v6.4.14#64029)
