RealmUsersRolesLoginModule's parent class UserRolesLoginModule calls addValidOptions() in initialize() to add add of it's options to the list of valid ones, but RealmUsersRolesLoginModule does not add it's options to this list.

This leads to a warning if you use that options:
WARN [org.jboss.as.security.RealmUsersRolesLoginModule] Invalid or misspelled option: realm

RealmUsersRolesLoginModule should call addValidOptions() too, passing "realm".