MismatchedInputException: Cannot deserialize instance of `xxx` out of START_ARRAY token

问题

使用postman向端发送请求时，出现
org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: Cannot deserialize instance of `xxx` out of START_ARRAY token; nested exception is com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize instance of `xxx` out of START_ARRAY token

原因

postman发送的特定字段为数组，但java object中该属性为对象，故序列化失败

办法

下面方案二选一

1. 将postman中问题属性改为对象；
2. 将java object中问题属性该为数组