How to customize serializing of java object

Question

How to serialize that object. But only with fields of object anotherObject but without "anotherObject" key in json

class A{
   int some = 1;
   B anotherObject = new B();
}

class B{
    int someB = 2;
}

I need as serializing result next JSON

{
    "A":{
       some: 1,
       anotherSome: 2
    }
}

Answer 1

You can use @JsonUnwrapped annotation.

class A {
    @JsonProperty
    int some = 1;

    @JsonUnwrapped
    B anotherObject = new B();
}

class B {
    @JsonProperty
    int someB = 2;
}