custom jaas login module

[Jan Zach]

Hi all!

in org.apache.catalina.realm.GeneralPrincipal I've found the following code:

    public Principal getUserPrincipal() {
        if (userPrincipal != null) {
            return userPrincipal;
        } else {
            return this;
        }
    }

Could anybody explain me the reason why I cannot assing a subject both user and 
role principal? Thanks a lot
Regards

Jan


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