java.lang.IllegalArgumentException: 'retrofit2.Response' is not a valid response body type. Did you mean ResponseBody?

Question

My question is so similar to Retrofit 2.0 beta 4 response get IllegalArgumentException but its answer didn't help me.

I'm migrating from Retrofit 1.9 to 2.0.2. I'm registering my app for messaging once launches.

    /**
     * Synchronous method to register GCM Token on Backend Server
     *
     * @return true, in case of success response, false otherwise.
     */
    public boolean registerGCMToken()
    {
        ...

        try
        {
            Call<Response> call = mService.registerGCMToken(sessionId, this.ADDITIONAL_QUERY);
            final Response response = call.execute().body(); // <<< Error points here
            final DefaultResponse defaultResponse = DefaultResponse.newInstance(response);
            return defaultResponse.isSuccess();
        }
        catch (IOException ignored)
        {

        }

        return false;
    }

My interface looks like:

    @GET("my/url")
    Call<Response> registerGCMToken(@Header(Constant.HEADER_WILDCARD) String accessToken,
                    @QueryMap Map<String, String> additionalQuery);

Once I launch the app I'm getting this error:

java.lang.IllegalArgumentException: 'retrofit2.Response' is not a valid response body type. Did you mean ResponseBody?

and points to the line I mentioned above.

My newInstance method looks like:

    public static final DefaultResponse newInstance(final Response response)
    {
        final DefaultResponse defaultResponse = new DefaultResponse();
        if (response != null)
        {
            defaultResponse.status = response.code();
        }

        return defaultResponse;
    }

So as you see, I need to know what is the HTTP status code. By changing Response generic to ResponseBody I'm not able to get http status code. What is your recommendation?

Answer 1

What i got while reading answers from the post suggested by you is that instead of this :

@GET("my/url")
    Call<Response> registerGCMToken(@Header(Constant.HEADER_WILDCARD) String accessToken,
                    @QueryMap Map<String, String> additionalQuery);

Try :

@GET("my/url")
    Call<ResponseBody> registerGCMToken(@Header(Constant.HEADER_WILDCARD) String accessToken,
                    @QueryMap Map<String, String> additionalQuery);

Because you are getting ResponseBody and not Response here :

        final Response response = call.execute().body();

Like he did : How can I handle empty response body with Retrofit 2?