[jira] [Created] (JENA-505) NPE in the OWL class

["Piotr Hołubowicz (JIRA)" <ji...@apache.org>]

Piotr Hołubowicz created JENA-505:
-------------------------------------

             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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