Configure RestAssured to use GSON over Jackson?

Question

I have both GSON and Jackson in a project using RestAssured and I want to use GSON. The official documentation does not provide a clear example. I tried several configs, but it does not seem to work. Here's my config, am I missing something?

RestAssured.config = RestAssuredConfig.config()
                .decoderConfig(new DecoderConfig("UTF-8"))
                .encoderConfig(new EncoderConfig("UTF-8", "UTF-8"))
                .objectMapperConfig(new ObjectMapperConfig(GSON));

Answer 1

In my project I solved it by wrapping original RestAssured.given method

public static RequestSpecification given() {
    return RestAssured.given()
        .config(RestAssured.config()
            .objectMapperConfig(new ObjectMapperConfig(ObjectMapperType.GSON)));
}

Answer 2

This worked for me in Kotlin:

RestAssured.config = RestAssuredConfig.config().objectMapperConfig(objectMapperConfig().defaultObjectMapperType(ObjectMapperType.GSON))

Answer 3

Well, as the Rest Assured documentation states, the order of technologies is:

1. JSON using Jackson 2 (Faster Jackson (databind))
2. JSON using Jackson (databind)
3. JSON using Gson
4. XML using JAXB

Furthermore the use of an explicit serializer or deserializer is also described.

Serialization:

Message message = new Message();
message.setMessage("My messagee");
given().
   body(message, ObjectMapperType.GSON).
when().
  post("/message");

Deserialization:

Message message = get("/message").as(Message.class, ObjectMapperType.GSON);