以下是我的工作室:

  @NotNull
  private Instant createdOn;

  @JsonInclude(JsonInclude.Include.NON_NULL)
  private Instant changedOn;

如您所见，我正在使用Java8 Instant类。在elasticsearch索引服务器中，我将以下内容存储为JSON：

  "createdOn": {
    "nano": 877000000,
    "epochSecond": 1579861613
  },
  "changedOn": {
    "nano": 920000000,
    "epochSecond": 1579861613
  },

问题是当我查询 elasticsearch 服务器以获取工作室时

    return elasticsearchOperations.queryForPage(new NativeSearchQueryBuilder().withQuery(mainQuery)
                                                                          .withPageable(elasticUtils.interceptPageable(searchDto.getPageable(), "name"))
                                                                          .build(),
                                            WorkroomDTO.class);

，我将这些字段映射到我的工作空间，得到以下异常:

    com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of `java.time.Instant` (no Creators, like default construct, exist): cannot deserialize from Object value (no delegate- or property-based Creator)
 at [Source: (String)"{"createdOn":{"nano":68000000,"epochSecond":1580127683}

仅供参考：

我已经创建了一个配置文件，其中将JavaTimeModule显式注册到Object Mapper

 @Configuration
public class JacksonConfiguration {

  @Value("${application.serialization.include-type-key:true}")
  private boolean includeTypeKey = true;

  @Bean
  public ObjectMapper objectMapper() {
    ObjectMapper mapper = new ObjectMapper();
    mapper.registerModule(new JavaTimeModule());
    mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
    mapper.addHandler(new MissingTypeIdHandler());
    if (includeTypeKey) {
      mapper.setMixInResolver(new TypeKeyMixInResolver());
    }
    return mapper;
  }

}

需要帮助！