Default deserialization of POJO containing another POJO with custom deserialization

[Oleksandr Khamylov]

Hi there.

Can't find out how to handle the next situation..

For instance, I have two classes:

public class ClassA {

 

    private String a;
    private int b;
    private Pair p;

 

    // constructors, getters and setters
}

public class Pair {

 

    private String x;
    private String y;

 

    // constructors, getters and setters
}

And I want serialized JSON to look smth. Like this:

"classA" :{
    "a" : "value a",
    "b" : 123,
    "p" : "44=>77"
}

So, I want Pair to be serialized/deserialized to/from a string with a specified pattern (e.g., <x>=><y>)

Cant' get it working specifying only custom JsonSerializer/JsonDeserializer for Pair class.

Does anyone have an ideas about solution?

[Tatu Saloranta]

Yes, custom serialization/deserialization is the way to go.

But instead of external JsonSerializer/JsonDeserializer, it may be possible to modify Pair class (if you have access) to:

1. For serialization, two main options:

    (a) Specify method to produce serialization as String, like so:

       @JsonValue

       public String asJson() { return String.format(....); }

    (b) Make Pair implement JsonSerializable

2. For deserialization, you can add "delegating creator", which gets JSON String; either factory method or constructor, so like:

    @JsonCreator

    public Pair(String jsonValue) {
           ...
    }

    OR

     @JsonCreator

     public static Pair factoryMethod(String jsonValue) { .... }

Hope this helps,

-+ Tatu +-

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