try {
Cookie loginCookie = new Cookie("login", "-");
loginCookie.setMaxAge(-1);
response.setHeader(HeaderName.SET_COOKIE, loginCookie.toString());
loginContext = new LoginContext("GVS-Auth", new CallbackHandler() {
public void handle(Callback[] callbacks) throws IOException, UnsupportedCallbackException {
for (int i = 0; i < callbacks.length; i++) {
if (callbacks[i] instanceof NameCallback) {
((NameCallback) callbacks[i]).setName("");