presto-main/src/main/java/io/prestosql/server/SessionPropertyDefaults.java/SessionPropertyDefaults/addConfigurationManagerFactory
class SessionPropertyDefaults:    public void addConfigurationManagerFactory(SessionPropertyConfigurationManagerFactory sessionConfigFactory)
    {
        if (factories.putIfAbsent(sessionConfigFactory.getName(), sessionConfigFactory) != null) {
            throw new IllegalArgumentException(format("Session property configuration manager '%s' is already registered", sessionConfigFactory.getName()));
        }
    }