con.add(DummyProvider.class.getResourceAsStream(filename), resource, RDFFormat.TURTLE);
con.commit();
} catch(RepositoryException ex) {
con.rollback();
} catch (RDFParseException e) {
throw new DataRetrievalException("could not parse resource data for file "+filename);
} catch (IOException e) {
throw new DataRetrievalException("could not load resource data for file "+filename);
} finally {