private boolean hasNullElements(SimulationConfiguration config) {
        return config.getEnvironment() == null || config.getHuman() == null 
               || config.getHumanZombieInteraction() == null || config.getPopulation() == null
               || config.getResources() == null || config.getZombieEpidemic() == null
               || config.getResources().getVaccination() == null || config.getResources().getWall() == null
               || config.getResources().getWeapon() == null;
    }