在请求缺席的情况下为空列表-SpringBoot和Jackson

Question

I have the following class:

class A {
    List <Integer> l;
    int a;
}

Now, when user sends request:

{
    a: 11,
}

it deserializes to Aa=11, Al=null .

I would like to in case of null send list it deserializes to empty list.

Can I do it in some elegant way ?

Answer 1

Just need add default value in l property

class A {
  List <Integer> l = = new ArrayList<>();
  int a;
}