public static List<Material> getBlacklist() {
	List<String> whitelist = conf.getStringList("blacklist", new ArrayList<String>());
	List<Material> result = new ArrayList<Material>();
	for (String materialString : whitelist) {
	    Material material = Material.getMaterial(materialString);
	    if (material == null) {
		BuildingPlanner.info("Blacklist item, "+materialString+", could not be mapped to a valid material");
		continue;
	    }
	    result.add(material);
	}
	
	return result;
    }