public DbMessageLogger() {
   kryo =
       new Kryo() {
         public Serializer newSerializer(Class aClass) {
           if (SubListSerializer.canSerialize(aClass)) return new SubListSerializer(this);
           return super.newSerializer(aClass);
         }
       };
   kryo.register(Arrays.asList("").getClass(), new ArraysAsListSerializer(kryo));
   kryo.setRegistrationOptional(true);
 }