Named models disappearing into TDB

[Zachary M Jablons]

Hey all,

I've been working with TDB for a bit now processing data into it, but I've
run into an issue where after adding a named model, I find that the named
model simply disappears, and is inaccessible. Here's some example code:

        Model prodModel = null;
        dset.begin(ReadWrite.WRITE);
        Lock lck = dset.getLock();
        try {
                lck.enterCriticalSection(Lock.WRITE);
            if (dset.containsNamedModel("product_info")) {
                prodModel = dset.getNamedModel("product_info");
                System.out.println("Using existing model");
            } else {
                System.out.println("Making new model");
                dset.addNamedModel("product_info",
ModelFactory.createDefaultModel());
                prodModel = dset.getNamedModel("product_info");
            }
            dset.commit();
        } finally {lck.leaveCriticalSection(); dset.end();}

        TDB.sync(dset);
        dset.begin(ReadWrite.READ);
        Iterator<String> itr = dset.listNames();
        while (itr.hasNext()) {
                System.out.println(itr.next());
        }
        dset.end();
In this case dset is a class attribute set by TDBFactory.createDataset
("path/to/dataset/") at construction. Is it possible that this is causing
an issue? If I run this multiple times, containsNamedModel returns false
each time, even though manually inspecting nodes.dat shows it.
I would expect it to print the named graph ("product_info") but instead
nothing is printed. I might be using Jena's TDB interface incorrectly --
it's hard to tell -- but I've been able to do this before with no issue.

I'm using jena-tdb-0.10.1, jena-core-2.10.1, jena-arq-2.10.1.

Thanks,
- Zach Jablons