Multiple instances of my JAX-RS implementation object

[Benson Margulies]

I'm expecting there to be one and only one instance of
RdfVisualizationService, but I'm seeing CXF create new ones upon
receipt of requests. I'm a bit confused by this, since I have other
rest-ful endpoints created via the API that have state and so
shouldn't work if this happens to them, but which seem to be working
just fine. The only 'interesting' thing about this one is that I
specify providers, which I've not done before.

public void start() throws IOException {
        endpointAddress = "http://localhost:"; + port;
        JAXRSServerFactoryBean sf = new JAXRSServerFactoryBean();
        sf.setResourceClasses(RdfVisualizationService.class);
        RdfVisualizationService service = new
RdfVisualizationService(risEndpointAddress);
        sf.setResourceProvider(QueryService.class, new
SingletonResourceProvider(service));
        List<VisualizationParamsProvider> providers = new
ArrayList<VisualizationParamsProvider>();
        providers.add(new VisualizationParamsProvider());
        sf.setProviders(providers);
        sf.setAddress(endpointAddress);
        queryEndpoint = sf.create();
    }