code: public SessionProvider getSystemSessionProvider(Object key)
     {
        if (systemSessionProviderKeeper.get() != null)
        {
           return systemSessionProviderKeeper.get();
        }
        else
        {
           final SessionProvider ssp = SessionProvider.createSystemProvider();
           systemSessionProviderKeeper.set(ssp);
           return ssp;
        }
     }
docs: {@inheritDoc}