code: public static boolean isUnauthenticated(Subject subject) {
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled()) {
              SibTr.entry(tc, CLASS_NAME + "isUnauthenticated", subject);
          }
          boolean result = subjectHelper.isUnauthenticated(subject);
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled()) {
              SibTr.exit(tc, CLASS_NAME + "isUnauthenticated", result);
          }
          return result;
      }
docs: Check if the Subject is Authenticated
  
  @param subject
  @return
  true if Subject is not authenticated