[JENA-1037] jena-osgi

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Jena 3.0.0
• Fix Version/s: Jena 3.8.0
• Component/s: OSGi

Environment

Karaf

• Assignee: Unassigned
• Reporter: Ben Gould
• Created: 29/Sep/15 14:59
• Updated: 29/Jun/18 10:13
• Resolved: 04/May/18 09:12

Description

I'm trying to create a simple interface/impl that will generate Prov-O RDF and place it on a JMS queue. This object will live in an OSGi environment and be injected into various operating services working in a workflow. I call the following piece of code:

public static OntModel createModel(final String ontologyUri) {
		final OntModel model = ModelFactory.createOntologyModel(OntModelSpec.OWL_MEM);
		model.read(ontologyUri);
		return model;
	}

with the ontologyUri="http://www.w3.org/ns/prov-o"; but when it gets to the ModelFactory.createOntologyModel(...) it chokes with the following stack trace.

java.lang.IncompatibleClassChangeError: Class org.apache.jena.rdfxml.xmlinput.impl.RDFXMLParser$SAXParserWithEncodingCheck does not implement the requested interface org.xml.sax.XMLReader
    at org.apache.jena.rdfxml.xmlinput.SAX2RDF.installHandlers(SAX2RDF.java:171)
    at org.apache.jena.rdfxml.xmlinput.impl.RDFXMLParser.<init>(RDFXMLParser.java:63)
    at org.apache.jena.rdfxml.xmlinput.impl.RDFXMLParser.create(RDFXMLParser.java:127)
    at org.apache.jena.rdfxml.xmlinput.JenaReader.<init>(JenaReader.java:69)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)[:1.8.0_11]
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)[:1.8.0_11]
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)[:1.8.0_11]
    at java.lang.reflect.Constructor.newInstance(Constructor.java:408)[:1.8.0_11]
    at java.lang.Class.newInstance(Class.java:433)[:1.8.0_11]
    at org.apache.jena.rdf.model.impl.RDFReaderFImpl.getReader(RDFReaderFImpl.java:120)
    at org.apache.jena.rdf.model.impl.ModelCom.read(ModelCom.java:279)
    at org.apache.jena.ontology.OntDocumentManager.findMetadata(OntDocumentManager.java:892)
    at org.apache.jena.ontology.OntDocumentManager.initialiseMetadata(OntDocumentManager.java:850)
    at org.apache.jena.ontology.OntDocumentManager.<init>(OntDocumentManager.java:198)
    at org.apache.jena.ontology.OntDocumentManager.<init>(OntDocumentManager.java:180)
    at org.apache.jena.ontology.OntDocumentManager.<init>(OntDocumentManager.java:164)
    at org.apache.jena.ontology.OntDocumentManager.getInstance(OntDocumentManager.java:242)
    at org.apache.jena.ontology.OntModelSpec.getDocumentManager(OntModelSpec.java:320)
    at org.apache.jena.ontology.impl.OntModelImpl.getDocumentManager(OntModelImpl.java:189)
    at org.apache.jena.ontology.impl.OntModelImpl.loadImports(OntModelImpl.java:1964)
    at org.apache.jena.ontology.impl.OntModelImpl.<init>(OntModelImpl.java:151)
    at org.apache.jena.ontology.impl.OntModelImpl.<init>(OntModelImpl.java:131)
    at org.apache.jena.rdf.model.ModelFactory.createOntologyModel(ModelFactory.java:288)
    ... 

What's triggering this exception is the following snippet of code:

	
public static OntModel createModel(final String ontologyUri) {
    final OntModel model = ModelFactory.createOntologyModel(OntModelSpec.OWL_MEM);
    model.read(ontologyUri);
    return model;
}

I'm basically creating an OntModel and then pulling the OntClass and OntProperty fields out of the model for creating some Models.

Issue Links

• is related to: JENA-1537 Remove requirement for Apache Xerces.
• relates to: JENA-1288 Reduce dependency on the Xerces jar.