private void logout() {
btnLogin.setVisible(true);
btnRegistration.setVisible(true);
btnAdvertReg.setVisible(false);
btnMyAccout.setVisible(false);
btnLogout.setVisible(false);
btnAdminAccount.setVisible(false);
AccountView.setAvailability(false);
AdvertRegView.setAvailability(false);
LetterView.setAvailability(false);
AdminView.setAvailability(false);
try {
VaadinSession.getCurrent().getLockInstance().lock();
VaadinSession.getCurrent().setAttribute(CURRENTUSER.toString(), null);
} finally {
VaadinSession.getCurrent().getLockInstance().unlock();
}
userLabel.setValue("");
}