Jackson Mapper serialize empty object instead of null

Question

Say I have classes Foo

public class Foo {
    private Bar bar;
}

and Bar

public class Bar {
    private String fizz;
    pr         


        

Answer 1

You could create a custom serializer for serializing Foo objects. Then in your custom FooSerializer implementation, you could check for a null bar value and serialize it as a default Bar instance. See https://spin.atomicobject.com/2016/07/01/custom-serializer-jackson/ or http://www.baeldung.com/jackson-custom-serialization for some examples of how to create custom serializers.