OAI harvesting fails with a 500

[Menzo Windhouwer]

Trying to harvest the VCR results in a 500:

757 [Thread-0] INFO nl.mpi.oai.harvester.Provider - Contacted ​http://clarin.ids-mannheim.de/vcr/oai to get its name, received: "CLARIN Virtual Collection Registry"
759 [Thread-0] INFO nl.mpi.oai.harvester.Worker - Processing provider CLARIN Virtual Collection Registry @ ​http://clarin.ids-mannheim.de/vcr/oai
759 [Thread-0] DEBUG nl.mpi.oai.harvester.Provider - Checking format namespace=​http://www.clarin.eu/cmd/
814 [Thread-0] DEBUG nl.mpi.oai.harvester.Provider - Found suitable prefix: cmdi
950 [Thread-0] ERROR nl.mpi.oai.harvester.Provider - java.io.IOException: Server returned HTTP response code: 500 for URL: ​http://clarin.ids-mannheim.de/vcr/oai?verb=GetRecord&identifier=oai:virtualcollectionregistry.cmdi.clarin.eu:1000&metadataPrefix=cmdi
999 [Thread-0] ERROR nl.mpi.oai.harvester.Provider - java.io.IOException: Server returned HTTP response code: 500 for URL: ​http://clarin.ids-mannheim.de/vcr/oai?verb=GetRecord&identifier=oai:virtualcollectionregistry.cmdi.clarin.eu:1000&metadataPrefix=cmdi
999 [Thread-0] INFO nl.mpi.oai.harvester.Worker - Processing finished for CLARIN Virtual Collection Registry @ ​http://clarin.ids-mannheim.de/vcr/oai

[Oliver Schonefeld]

    @Override
    public Record getRecord(Object localId, boolean headerOnly)
            throws OAIException {
        try {
            long id = (Long) localId;
// it fails in the next line with a NullPointerException. Probably "registry" is
// not initialized correctly
            VirtualCollection vc = registry.retrieveVirtualCollection(id);
            return createRecord(vc, headerOnly);
        } catch (VirtualCollectionNotFoundException e) {
            return null;
        } catch (VirtualCollectionRegistryException e) {
            throw new OAIException("error", e);
        }
    }

[Oliver Schonefeld]

Hopefully r5708 and r5709 fix that problem. Please run the harvester again an close ticket of the problem is solved.

[Twan Goosen]

Merged fixes to 1.0 branch with an added note to the Component annotation in r5730