Question

Given an entity class with a compound key that is managed by hibernate is there a simple way to flatten the keys properties into the object itself?

Given:

{
    "key": {
        "field1": 1,
        "field2": 2
    },
    "prop": "value"
}

I would prefer this to be serialized as:

{
    "field1": 1,
    "field2": 2,
    "prop": "value"
}

I really don’t want to have to implement JsonSerializableWithType as it’s fine at the moment, it’s just that key class I want the fields flattened.

Answer 1

Jackson uses reflection, and you can manipulate getters/setters. You can add @JsonIgnore to getKey(), and add two methods

@JsonProperty("field1")
private int getField1()

@JsonProperty("field2")
private int getField2()

You may want to implement setField1() and setField2() as well.