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How to ignore json property in encapsulated design

class A{ 
   private B b; 
   //other properties
   //getter setter
}
// unable to add jsonIgnore in this class due to dependency in other module
class B {
   int id;
   String name;
   String defname;
}

I want to ignore defname

in the class A

the JSON construction using the codehaus.jackson

API.

I need {a:{id:value,name:value}}

.

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1 answer


You can use Mixin for this purpose.

  • First, create an abstract class with JsonIgnore annotation:

    abstract class MixIn{
     @JsonIgnore
     abstract String getDefname(); }

  • Then use it as shown below. (Make sure your defName field getter name is as getDefName () in your B class, or change it in Mixin class to be yours.)

    ObjectMapper objectMapper = new ObjectMapper();
objectMapper.addMixIn( B.class, MixIn.class );
objectMapper.writeValue( System.out, new A() );


Prints:

{"b":{"id":1,"name":"Sercan"}}
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