// collect list of persistence providers packaged with the application
            final List<String> providerNames = servicesAttachment.getServiceImplementations(PersistenceProvider.class.getName());
            if (providerNames.size() > 1) {     // TODO: support more than one provider to be packaged, which requires
                // knowing which adapter belongs with it.
                throw MESSAGES.onlyOnePersistenceProviderAllowed(providerNames);
            }