<tt>AuthenticationStrategy</tt> implementation that requires <em>all</em> configured realms to <b>successfully</b> process the submitted <tt>AuthenticationToken</tt> during the log-in attempt. <p/> <p>If one or more realms do not support the submitted token, or one or more are unable to acquire <tt>AuthenticationInfo</tt> for the token, this implementation will immediately fail the log-in attempt for the associated subject (user).