private DualListModel<Authority> dualListModel = new DualListModel<Authority>(
new ArrayList<Authority>(), new ArrayList<Authority>());
public String addUser() {
user = new User(name, surname, password, email, secretQuestion,
secretAnswer, UmsUtil.toSetFromAuthorities(selectedAuthorities));
try {
userService.addUser(user);
} catch (ExistedException e) {
FacesContext.getCurrentInstance().addMessage(