JenaException: Invalid properties file

I have been working with Jena fine for the first few weeks. However, today tomcat has started spitting out errors.

I think I've narrowed it down to:

Caused by: com.hp.hpl.jena.shared.JenaException: Invalid properties file
at com.hp.hpl.jena.util.Metadata.read(Metadata.java:71)
at com.hp.hpl.jena.util.Metadata.addMetadata(Metadata.java:41)
at com.hp.hpl.jena.util.Metadata.<init>(Metadata.java:35)
at com.hp.hpl.jena.JenaRuntime.<clinit>(JenaRuntime.java:25)

Although, I can't figure out which properties file it means. I've never configured a property file for jena. The only other thing I can think of that requires parsing is my web.xml which doesn't look wrong.

The code that causes the error is:

开发者_C百科

public void getOntModel()
{
    try
    {
        ssn = ModelFactory.createOntologyModel();
        ssn.read(NS);
    }
    catch(Exception ex)
    {
        ex.printStackTrace();
        System.out.println("[ONTOLOGY] Failed to read ontology file");
    }
    System.out.println("[ONTOLOGY] Ontology successfully read");
}

Specifically:

ssn = ModelFactory.createOntologyModel();

---

Looking at the source:

• http://grepcode.com/file/repo1.maven.org/maven2/com.hp.hpl.jena/jena/2.6.3/com/hp/hpl/jena/JenaRuntime.java#JenaRuntime

This is what is happening:

 private static String metadataLocation = "com/hp/hpl/jena/jena-properties.xml" ;
 private static Metadata metadata = new Metadata(metadataLocation) ;

It seems that it's trying to load the resource specified by metadataLocation. Can you check that your classpath is correct? Especially, check that there are no mixed versions of Jena libraries - if there are, reorder them so the newest are in front of your classpath.

If on some Unix-like system, you can use:

find /path/to/lib -name "*.jar"|while read fn; do
   echo ---- $fn
   jar tf $fn|grep jena-properties.xml
done

to find the jar that contains that property file - just change /path/to/lib to the path where your Jena libraries are located.