Piotr Hołubowicz created JENA-505:
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Summary: NPE in the OWL class
Key: JENA-505
URL: https://issues.apache.org/jira/browse/JENA-505
Project: Apache Jena
Issue Type: Bug
Components: Jena
Affects Versions: Jena 2.10.1
Reporter: Piotr Hołubowicz
The error happens when you try to load a file using the file manager in Jena
2.10.1, for example
{code}
model =
FileManager.get().loadModel("http://example.org","http://example.org","RDF/XML";);
{code}
The reason is incorrect initialization of variables in the OWL class. In the
following code:
{code}
public class OWL {
private static Model m_model = ModelFactory.createDefaultModel();
public static final String NS = "http://www.w3.org/2002/07/owl#";;
public static String getURI() {return NS;}
...
public static final Property sameAs = m_model.createProperty(
"http://www.w3.org/2002/07/owl#sameAs"; );
...
{code}
a call to OWL.sameAs will result in a NPE because m_model is null. I guess that
if you start with OWL.getURI(), then m_model will be evaluated first and there
will be no error, which is why this never occurred before.
I think that a solution would be to make m_model final as well.
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