NoSuchElementException when reading principals where multiple Realms in use

[zgrose]

I have an application that uses multiple Realms (in this particular case an IniRealm and the ApplicationRealm). ApplicationRealm.getAccountHref() assumes that the subject was authenticated against the ApplicationRealm

protected String getAccountHref(PrincipalCollection principals) {
    Collection c = principals.fromRealm(getName());
    //Based on the createPrincipals implementation above, the first one is the Account href:
    return (String) c.iterator().next();
}

When a PrincipalCollection is passed to doGetAuthorizationInfo, the c.size() == 0 so there is no next().

java.util.NoSuchElementException
at java.util.Collections$EmptyIterator.next(Collections.java:3006)

Trapping an empty collection and returning a default/empty SimpleAuthorizationInfo seems the most appropriate solution but that's just a guess.

[mike10004]

This happened to me on the first visit to a site after switching my application's realm from IniRealm to ApplicationRealm, because it still had the cookie from the previous login. (Or, I assume that's the explanation, because visiting in incognito mode worked and then clearing the cookie and refreshing worked.) I understand what happened, but the NoSuchElementException stack trace in the logs did not point me in the right direction.