code: @Override
      public void notifyOfUserRegistryChange() {
          if (TraceComponent.isAnyTracingEnabled() && tc.isDebugEnabled()) {
              Tr.debug(tc, "Resetting unauthenticatedSubject as UserRegistry configuration has changed");
          }
          synchronized (unauthenticatedSubjectLock) {
              unauthenticatedSubject = null;
          }
      }
docs: {@inheritDoc}