org.codehaus.jackson.map.JsonMappingException: No suitable constructor found for type

時間 2020-08-29

標籤 org.codehaus.jackson.map.jsonmappingexception org codehaus jackson map jsonmappingexception suitable constructor type 简体版

原文原文鏈接

org.codehaus.jackson.map.JsonMappingException: No suitable constructor found for type

 
  org.codehaus.jackson.map.JsonMappingException: No suitable constructor found  
  for 
  type [simple type,  
  class 
  test.jackson.Employee]: can not instantiate from JSON object (need to add/enable type information?) 
 

 
    
  at [Source: c:\temp\employee.json; line:  
  1 
  , column:  
  2 
  ] 
 

 
  at org.codehaus.jackson.map.JsonMappingException.from(JsonMappingException.java: 
  163 
  )

 
  at org.codehaus.jackson.map.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java: 
  483 
  )

 
  at org.codehaus.jackson.map.deser.BeanDeserializer.deserialize(BeanDeserializer.java: 
  350 
  )

 
  at org.codehaus.jackson.map.ObjectMapper._readMapAndClose(ObjectMapper.java: 
  2395 
  )

 
  at org.codehaus.jackson.map.ObjectMapper.readValue(ObjectMapper.java: 
  1549 
  )

 
  at test.jackson.JSONToJavaExample.main(JSONToJavaExample.java: 
  19 
  )

通常來講，解決上面問題從下面幾個方面入手：java

一、是否缺乏默認構造函數json

二、是不是類的訪問修飾符問題，即jackson訪問不到。app

suitable

constructor

type

constructor&&prototype