OpenSAML user discussion

Hello!

We just started a school project that involves openSAML. We are trying to 
understand how the library works and now we are testing the basic 
functionality examples we found on opensaml.org. 

The "creating SAML object from XML source" example doesnt work for us and we 
cant figure out why.

 
String inCommonMDFile = 
"/data/org/opensaml/saml2/metadata/InCommon-metadata.xml";
        
ParserPoolManager ppMgr = ParserPoolManager.getInstance();

        try {
            InputStream in = 
Builder.class.getResourceAsStream(inCommonMDFile);
            Document inCommonMDDoc = ppMgr.parse(in);
            Unmarshaller unmarshaller = 
Configuration.getUnmarshallerFactory().getUnmarshaller(
                    inCommonMDDoc.getDocumentElement());

            XMLObject inCommonMD = 
unmarshaller.unmarshall(inCommonMDDoc.getDocumentElement());

            assertEquals("First element of InCommon data was not expected 
EntitiesDescriptor", "EntitiesDescriptor",
                    inCommonMD.getElementQName().getLocalPart());
        } catch (XMLParserException xe) {
            fail("Unable to parse XML file: " + xe);
        } catch (UnmarshallingException ue) {
            fail("Unable to unmarshall XML: " + ue);
        }
    

When running this we get a NullPointerException at the 
unmarshaller.unmarshall(inCommonMDDoc.getDocumentElement()); line.

What is the problem? Would really appreciate some help getting us started.

Regards / Lars K