JsonMappingException No suitable constructor found for type simple type class can not instantiate from JSON object

Question

I am getting the following error when trying to get a JSON request and process it:

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

Here is the JSON I am trying to send:

{
  "applesDO" : [
    {
      "apple" : "Green Apple"
    },
    {
      "apple" : "Red Apple"
    }
  ]
}

Answer 1

Hello @kartik,

his happens for these reasons:

1. your inner class should be defined as static

   private static class Condition {  //jackson specific    
   }

2. It might be that you got no default constructor in your class (UPDATE: This seems not to be the case)

   private static class Condition {
       private Long id;
   
       public Condition() {
       }
   
       // Setters and Getters
   }

3. It could be your Setters are not defined properly or are not visible (e.g. private setter)