code: @Override
     protected Object convert(Object instance) {
        try {
           return ProtobufUtil.toWrappedByteArray(serializationContext, instance);
        } catch (IOException e) {
           throw new CacheException(e);
        }
     }
docs: Marshals the instance using Protobuf.
  
  @param instance never null
  @return the converted/decorated instance