Retrofit: Unable to create @Body converter for class

Issue

I need to send next json via retrofit 2:

{
    "Inspection": {
        "UUID": "name",
        "ModifiedTime": "2016-03-09T01:13",
        "CreatedTime": "2016-03-09T01:13",
        "ReviewedWith": "name2",
        "Type": 1,
        "Project": {
            "Id": 41
        },
        "ActionTypes": [1]
    }   
}

With Header: Authorization: access_token_value

I tried this:

//header parameter
String accessToken = Requests.getAccessToken();

JsonObject obj = new JsonObject();
JsonObject inspection = new JsonObject();

inspection.addProperty("UUID","name");
inspection.addProperty("ModifiedTime","2016-03-09T01:13");
inspection.addProperty("CreatedTime","2016-03-09T01:13");
inspection.addProperty("ReviewedWith","name2");
inspection.addProperty("Type","1");

JsonObject project = new JsonObject();
project.addProperty("Id", 41);

inspection.add("Project", project);
obj.add("Inspection", inspection);

Retrofit restAdapter = new Retrofit.Builder()
        .baseUrl(Constants.ROOT_API_URL)
        .addConverterFactory(GsonConverterFactory.create())
        .addConverterFactory(ScalarsConverterFactory.create())
        .build();
IConstructSecureAPI service = restAdapter.create(IConstructSecureAPI.class);
Call<JsonElement> result = service.addInspection(accessToken, obj);
JsonElement element = result.execute().body();

But everytime i recieved exception: java.lang.IllegalArgumentException: Unable to create @Body converter for class com.google.gson.JsonObject (parameter #2)

How can I send it ? Or any another idea how I can do it. You can even offer me with parameter as simple String with json inside. It will suit for me

Solution

Solution: declare body value in your interface with next:

@Body RequestBody body and wrap String JSON object:

RequestBody body = RequestBody.create(MediaType.parse("application/json"), obj.toString());

Answered By - kkost