Loading triples into empty SDB Store

[Cindy A McMullen]

I want to load triples into an empty SDB Store.  Here's what I'm trying:

Store store = getStore();
GraphSDB graph = new GraphSDB(store);
DatasetGraph datasetGraph = DatasetGraphFactory.create(graph);
if (datasetGraph.isEmpty())
{
      System.out.println("Empty dataset graph");      // yes, it is
}
for (EventGraph eventGraph : eventGraphs)   // internal classes
{
         persist(eventGraph, datasetGraph);   // code below
}

--------
I'm calling into the same code that I use for in-memory implementation to 
persist:

protected void persist(EventGraph eventGraph, DatasetGraph dsg)
    {
        // First,  pull the triples from the Set<Event>.
        Set<Triple> triples = generateTriplesFromGraphEvent(eventGraph);

        // Named graph node, into which we'll store the event triples
        Node graphNode = Node.createURI(UUID.randomUUID().toString());

        // Next, create a Jena Quad for that
        for (Triple triple : triples)
        {
            Quad q = new Quad(graphNode, triple);
            dsg.add(q);
        }

        dsg.add(new Quad(Quad.defaultGraphIRI, createActionTriple(graphNode, 
eventGraph)));
        dsg.add(new Quad(Quad.defaultGraphIRI, createTimestampTriple(graphNode, 
eventGraph)));
    }

-------
And get this message for the "dsg.add(q)" line:

 Exception in thread "main" com.hp.hpl.jena.shared.JenaException: No such 
graph: ef3f02ef-c203-42af-9e3d-9061acf27022
    DatasetGraphCollection.add(DatasetGraphCollection.java:41)
    InMemoryRDFManager.persist(InMemoryRDFManager.java:98)
    SDBRDFManager.persist(SDBRDFManager.java:58)

----

Any ideas?