Question

Java 1.8
Spring Boot 1.5.8
faster.xml.jackson（jackson-module-parameter-names，jackson-datatype-jdk8，jackson-datatype-jsr310）2.9.2

我有一个带时间戳的对象。

@JsonProperty("timestamp")
private LocalDateTime timestamp;

我需要反序列化的LocalDateTime标记是：

{ "year":2017, "month":"OCTOBER", "dayOfMonth":27, "dayOfWeek":"FRIDAY", "dayOfYear":300, "monthValue":10, "nano":460000000, "hour":4, "minute":47, "second":29, "chronology":{ "calendarType":"iso8601", "id":"ISO" } }

我尝试使用以下命令反序列化对象：

MyObject myObject=
         new ObjectMapper()
             .findAndRegisterModules()
             .treeToValue(jsonPayload, MyObject.class);

应用程序在此调用时冻结，如果我中断调用，则会收到以下错误消息：

Error while stopping the container:
java.lang.NoSuchMethodError: com.fasterxml.jackson.databind.DeserializationContext.wrongTokenException(Lcom/fasterxml/jackson/core/JsonParser;Ljava/lang/Class;Lcom/fasterxml/jackson/core/JsonToken;Ljava/lang/String;)Lcom/fasterxml/jackson/databind/JsonMappingException;
        at com.fasterxml.jackson.datatype.jsr310.deser.LocalDateTimeDeserializer.deserialize(LocalDateTimeDeserializer.java:138) ~[jackson-datatype-jsr310-2.9.2.jar!/:2.9.2]
        at com.fasterxml.jackson.datatype.jsr310.deser.LocalDateTimeDeserializer.deserialize(LocalDateTimeDeserializer.java:39) ~[jackson-datatype-jsr310-2.9.2.jar!/:2.9.2]
        at com.fasterxml.jackson.databind.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:504) ~[jackson-databind-2.8.10.jar!/:2.8.10]
        at com.fasterxml.jackson.databind.deser.impl.FieldProperty.deserializeAndSet(FieldProperty.java:111) ~[jackson-databind-2.8.10.jar!/:2.8.10]
        at com.fasterxml.jackson.databind.deser.BeanDeserializer.vanillaDeserialize(BeanDeserializer.java:276) ~[jackson-databind-2.8.10.jar!/:2.8.10]
        at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:140) ~[jackson-databind-2.8.10.jar!/:2.8.10]
        at com.fasterxml.jackson.databind.ObjectMapper._readValue(ObjectMapper.java:3786) ~[jackson-databind-2.8.10.jar!/:2.8.10]
        at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2115) ~[jackson-databind-2.8.10.jar!/:2.8.10]
        at com.fasterxml.jackson.databind.ObjectMapper.treeToValue(ObjectMapper.java:2612) ~[jackson-databind-2.8.10.jar!/:2.8.10]

UPDATE＆＃39; S：

整个JSON是：

{"valid":true,"version":"0.0.1",
"timestamp":{"year":2017,"month":"OCTOBER","dayOfMonth":27,"dayOfWeek":"FRIDAY","dayOfYear":300,"monthValue":10,"nano":460000000,"hour":4,"minute":47,"second":29,"chronology":{"calendarType":"iso8601","id":"ISO"}},
"tenant":"stackoverflow","uid":"10fa132f-2c92-4fa5-bcc2-ee6023281503"})

序列化：

String jsonString = new ObjectMapper().writeValueAsString(messageIndex);

对象属性：

@JsonProperty("version")
private String version;

@JsonProperty("timestamp")
private LocalDateTime timestamp;

@JsonProperty("tenant")
private String tenant;

@JsonProperty("dataSampleUid")
private UUID uid;

private boolean isValid;

LocalDateTime设置为：

LocalDateTime.now()

Answer 1

序列化时，您没有注册任何模块，尤其是JavaTimeModule，因此LocalDateTime将像任何其他对象一样被序列化（打印所有可访问的字段）。但是在反序列化部分中，您注册了此模块，并且它们期望LocalDateTime（by default an array）的特定格式。

如果您希望这样做，只需更新序列化部分：

String jsonString = new ObjectMapper().findAndRegisterModules().writeValueAsString(messageIndex);

您应该通过您的应用程序重用相同的对象映射器，对于读者来说也是如此。两者都是因为线程安全，因为实例相对较轻。

运行此命令，您将看到它正常工作，您将看到LocalDateTime序列化值的差异。

ObjectMapper mapper = new ObjectMapper().findAndRegisterModules();
MyObject data = new MyObject();
data.setTimestamp(LocalDateTime.now());
String result = mapper.writeValueAsString(data);
System.out.println(result);
JsonNode tree = mapper.reader().readTree(result);
mapper.treeToValue(tree, MyObject.class);

Java fasterxml.jackson反序列化LocalDateTime wrongTokenException

1 个答案: