MessageContext mContext = wsContext.getMessageContext();

    Map http_headers = (Map) mContext.get(MessageContext.HTTP_REQUEST_HEADERS);
    List userList = (List) http_headers.get("Username");
    List passList = (List) http_headers.get("Password");

    String username = "";
    String password = "";

    if(userList != null) {
        username = userList.get(0).toString();
        System.out.println("User: " + userList.get(0).toString());
    }

    if(passList != null) {
        password = passList.get(0).toString();
        System.out.println("Pass: " + passList.get(0).toString());
    }

    if (username.equals("admin") && password.equals("admin")){
        return "Hello World JAX-WS - Valid User!";
    }else{
        return "Unknown User!";
    }