Handler not invoked on client with XFireProxyFactory

My Handler is not invoked, with this code

Service serviceModel = new ObjectServiceFactory().create(DemoService.class, "DemoService", "http://demo.tranchida.ch/DemoService", null);
serviceModel.addOutHandler(new WSSEClientHandler());

DemoService service = (DemoService)
new XFireProxyFactory().create(serviceModel, "http://localhost:8080/DemoService/services/DemoService");
System.out.println(service.echo("hello"));

Looking at XFireProxy in debug, outHandlers list contains only OutMessageSender

But Using Dynamic client, it is ok, my Handler is normaly invoked

Client client = new Client(new URL("http://localhost:9999/DemoService/services/DemoService?wsdl"));
client.setEndpointUri("http://localhost:9999/DemoService/services/DemoService");
client.addOutHandler(new WSSEClientHandler());
System.out.println(client.invoke("echo", new Object[]

)[0]);