Cannot construct instance of `com.**` (although at least one Creator exists)

 

JSON parse error: Cannot construct instance of `com.**` (although at least one Creator exists): cannot deserialize from Object value (no delegate- or property-based Creator); nested exception is com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot construct instance of `com.**` (although at least one Creator exists): cannot deserialize from Object value (no delegate- or property-based Creator)
 at [Source: (PushbackInputStream); line: 2, column: 2]]
 

spring boot 的post傳遞實體類的過程中出現了反向序列化的異常

解決方案
在實體類中添加無參構造函數。

 

原因
jackson的反序列化需要無參構造函數，而我在實體類中添加了有參數的構造函數。

在實體類中添加無參構造函數即可。