無法反序列化`java.time.Instant`類型的值 - jackson

Question

有這樣的課

@AllArgsConstructor
@NoArgsConstructor
@Getter
@Setter
public final class ActiveRecoveryProcess {

    private UUID recoveryId;
    private Instant startedAt;
}

我收到com.fasterxml.jackson.databind.exc.InvalidFormatException消息Cannot deserialize value of type java.time.Instant Cannot deserialize value of type值from String "2020-02-22T16:37:23": Failed to deserialize java.time.Instant: (java.time.format.DateTimeParseException) Text '2020-02-22T16:37:23' could not be parsed at index 19

JSON 輸入

{"startedAt": "2020-02-22T16:37:23", "recoveryId": "6f6ee3e5-51c7-496a-b845-1c647a64021e"}

傑克遜配置

    @Autowired
    void configureObjectMapper(final ObjectMapper mapper) {
        mapper.registerModule(new ParameterNamesModule())
                .registerModule(new Jdk8Module())
                .registerModule(new JavaTimeModule());
        mapper.findAndRegisterModules();
    }

編輯

JSON 是從 postgres 生成的

jsonb_build_object(
                        'recoveryId', r.recovery_id,
                        'startedAt', r.started_at
)

其中r.started_at是時間戳。

Answer 1

一種方法是創建一個Converter 。

public final class NoUTCInstant implements Converter<LocalDateTime, Instant> {
    @Override
    public Instant convert(LocalDateTime value) {
        return value.toInstant(ZoneOffset.UTC);
    }
    @Override
    public JavaType getInputType(TypeFactory typeFactory) {
        return typeFactory.constructType(LocalDateTime.class);
    }
    @Override
    public JavaType getOutputType(TypeFactory typeFactory) {
        return typeFactory.constructType(Instant.class);
    }
}

然后注釋該字段。

@JsonDeserialize(converter = NoUTCInstant.class)
private Instant startedAt;

Answer 2

您嘗試解析的字符串2020-02-22T16:37:23不以Z結尾。 Instant 期望這一點，因為它代表UTC 。 它根本無法解析。 將字符串與 Z 連接以解決該問題。

        String customInstant = "2020-02-22T16:37:23";

        System.out.println("Instant of: " + Instant.parse(customInstant.concat("Z")));