@Bean
    public ObjectMapper objectMapper() {

        // ObjectMapper is threadsafe

        // allow convertation to/from Instant
        ObjectMapper mapper = new ObjectMapper().registerModule(new JavaTimeModule());
        // will write as string ISO 8601
        mapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);


        mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, true);
        mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
        //mapper.setPropertyNamingStrategy(PropertyNamingStrategy.SNAKE_CASE);
        //mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        //mapper.configure(MapperFeature.DEFAULT_VIEW_INCLUSION, true);
        return mapper;
    }