无法从START_OBJECT令牌反序列化org.joda.time.DateTime或LocalDate的实例 [英] Can not deserialize instance of org.joda.time.DateTime or LocalDate out of START_OBJECT token

问题描述

v2.1.1， joda module。

我可以使用objectMapper.readValue（file，pojo .class）在单元测试中将json文件转换为pojo;

I can convert a json file to a pojo in a unit test using objectMapper.readValue(file, pojo .class);

但是，当a Spring RESTTemplate客户端调用默认的json转换器使用Joda类型（DateTime或LocalDate）转换包含域对象的inputStream，它会生成错误： objectMapper.readValue（httpInputMessage.getBody（），javaType）

However, when a Spring RESTTemplate client invokes the default json converter to convert an inputStream containing the domain object with Joda types (DateTime or LocalDate), it generates an error: objectMapper.readValue(httpInputMessage.getBody(), javaType)

   
com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of org.joda.time.DateTime out of START_OBJECT token
at Source: org.mortbay.jetty.HttpParser$Input@46a09b; line: 1, column: 752
at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:164)
at com.fasterxml.jackson.databind.DeserializationContext.mappingException(DeserializationContext.java:599)
at com.fasterxml.jackson.databind.DeserializationContext.mappingException(DeserializationContext.java:593)
at com.fasterxml.jackson.datatype.joda.deser.DateTimeDeserializer.deserialize(DateTimeDeserializer.java:51)
at com.fasterxml.jackson.datatype.joda.deser.DateTimeDeserializer.deserialize(DateTimeDeserializer.java:21)
at com.fasterxml.jackson.databind.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:375)
at com.fasterxml.jackson.databind.deser.BeanDeserializer._deserializeUsingPropertyBased(BeanDeserializer.java:559)
at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObjectUsingNonDefault(BeanDeserializer.java:393)
at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:289)
at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:121)
at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:226)
at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:203)
at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:23)
at com.fasterxml.jackson.databind.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:375)
at com.fasterxml.jackson.databind.deser.impl.MethodProperty.deserializeSetAndReturn(MethodProperty.java:106)
at com.fasterxml.jackson.databind.deser.BuilderBasedDeserializer.deserializeFromObject(BuilderBasedDeserializer.java:326)
at com.fasterxml.jackson.databind.deser.BuilderBasedDeserializer.deserialize(BuilderBasedDeserializer.java:143)
at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:226)
at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:203)
at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:23)
at com.fasterxml.jackson.databind.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:375)
at com.fasterxml.jackson.databind.deser.impl.MethodProperty.deserializeSetAndReturn(MethodProperty.java:106)
at com.fasterxml.jackson.databind.deser.BuilderBasedDeserializer.deserializeFromObject(BuilderBasedDeserializer.java:

LocalDate发生同样的问题

Same issue occurs with LocalDate

com.fasterxml.jackson.databind.JsonMappingException: Unexpected token (START_OBJECT), expected START_ARRAY: expected JSON Array, String or Number
at Source: org.mortbay.jetty.HttpParser$Input@d297c0; line: 1, column: 51
at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:164)
at com.fasterxml.jackson.databind.DeserializationContext.wrongTokenException(DeserializationContext.java:692)
at com.fasterxml.jackson.datatype.joda.deser.LocalDateDeserializer.deserialize(LocalDateDeserializer.java:50)
....

为什么调用链在一个案例中传递START_OBJECT而在另一个案件中传递START_ARRAY？

Why is the call chain passing a START_OBJECT in one case and START_ARRAY in the other?

推荐答案

为了解决类似的问题，我做了以下工作，

To solve a similar problem I did the following,

我从http://mvnrepository.com/artifact/com.fasterxml.jackson.datatype/jackson-datatype -joda / 2.2.1 如果您正在使用maven，依赖项定义也在那里。

I downloaded jackson-datatype-joda-2.2.1.jar from http://mvnrepository.com/artifact/com.fasterxml.jackson.datatype/jackson-datatype-joda/2.2.1 if you are using maven the dependency definition is there too.

然后我为我的应用中的每个LocalDate字段添加了一个注释如下：

then I added an annotation for every LocalDate field in my app as follows:

@JsonDeserialize(using=LocalDateDeserializer.class)
private LocalDate releasedDate;

导入如下所示：

import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
import com.fasterxml.jackson.datatype.joda.deser.LocalDateDeserializer;

问题消失了。

希望这有帮助！

这篇关于无法从START_OBJECT令牌反序列化org.joda.time.DateTime或LocalDate的实例的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！