Properties from javax.ws.rs.core.Application.getProperties are not registered

HttpServer server = HttpServer.create(new InetSocketAddress(9998), 1); HttpContextBuilder contextBuilder = new HttpContextBuilder(); Application application = new Application() { @Override public Map<String, Object> getProperties() { return Collections.<String, Object> singletonMap("Prop1", "Value1"); } @Override public Set<Class<?>> getClasses() { Set<Class<?>> classes = new HashSet<>(); classes.add(UsersResource.class); classes.add(ServerSecurityFeature.class); return classes; } @Override public Set<Object> getSingletons() { return Collections.<Object> singleton(new Feature() { @Override public boolean configure(FeatureContext featureContext) { // Always return false event if the property is // correctly registered return featureContext.getConfiguration() .getProperties().containsKey("Prop1"); } }); } }; contextBuilder.getDeployment().setApplication(application); HttpContext context = contextBuilder.bind(server); server.start();