private static String makeProductImageFilename(String id, String type) {
   return String.format("%s-%s-%06d", id, type, RandomUtils2.randomInt(0, 1000000));
 }
 private static String makeProductFilename(String id, int version) {
   return String.format("%s-%s-%06d", id, version, RandomUtils2.randomInt(0, 1000000));
 }