public class Activator implements BundleActivator {
private BundleTracker tracker;
@Override
public void start(BundleContext context) throws Exception {
ModelGraph graph = context.getService(context.getServiceReference(ModelGraph.class));
ModelRegistryService service = new ModelRegistryService(context);
service.setGraphDb(graph);
service.setEkbClassLoader(new EKBClassLoaderService(context));
tracker = service;
tracker.open();