Rest请求使用Jackson反序列化报错，Cannot deserialize instance of `java.lang.String` out of START

Rest接口，使用Jackson作为json转换器，后端接收请求的时候报错了，异常信息：

JSON parse error: Cannot deserialize instance of `java.lang.String` out of START_OBJECT token; nested exception is com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize instance of `java.lang.String` out of START_OBJECT token
at [Source: (PushbackInputStream); line: 1, column: 138] (through reference chain: com.xxx.TradeDto["body"]->com.xxx.dto.FxsFsDto["txDt"])] [http-nio-9008-exec-10]
org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: Cannot deserialize instance of `java.lang.String` out of START_OBJECT token; nested exception is com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize instance of `java.lang.String` out of START_OBJECT token
at [Source: (PushbackInputStream); line: 1, column: 138] (through reference chain: com.xxx.TradeDto["body"]->com.xxx.dto.FxsFsDto["txDt"])

请求报文：

{"body":{"txType":"01","nearDeliveryType":"01","txDt":{}}}

异常信息是很详细、明确的，

Cannot deserialize instance of `java.lang.String` out of START_OBJECT

是说无法将字段，从START_OBJECT（Object类型，即对象）转换为String（字符串类型）

(through reference chain: com.xxx.TradeDto["body"]->com.xxx.dto.FxsFsDto["txDt"])

是说，转换出错的字段，是body字段里的txDt字段。

还包含了类型信息：

com.xxx.TradeDto是整个请求体的类型

body字段是com.xxx.dto.FxsFsDto类型

综上，出错原因是body的txDt字段，请求数据是Object类型，接收方要求的是String类型，不匹配。

问题解决：

将txDt改成字符串

更改后的请求报文：

{"body":{"txType":"01","nearDeliveryType":"01","txDt":""}}

附：

关于Jackson转换，报错信息是很明确的，

比如:Cannot deserialize instance of `java.util.ArrayList` out of START_OBJECT token

意思是无法将对象转换为列表

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Rest请求使用Jackson反序列化报错，Cannot deserialize instance of `java.lang.String` out of START_OBJECT toke

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