return null;
}
public void login(final String user, final String... roles) throws LoginException {
final Set<Principal> set = new HashSet<Principal>();
set.add(new UserPrincipal(user));
for (final String role : roles) {
set.add(new GroupPrincipal(role));
}
final Subject subject = new Subject(true, set, Collections.EMPTY_SET, Collections.EMPTY_SET);
final UUID uuid = registerSubject(subject);