Handle Void and Non-Void response with Retrofit 2 and RxJava 2

Question

I have a call to send data to the server. If everything is ok, the server returns a void response. But when there is an error I get data back.

To manage the case when there is an error I have a CustomResponse object. The issue is that when the request is successful Retrofit throws an Exception with the message: java.io.EOFException: End of input at line 1 column 1 path $

Here is the call:

@POST("/updateObject")
Observable<CustomResponse> updateObject(@Body CustomObject requestData);

I did a bit of researches and I read that I could use Observable<Response<Void>> ... but in that case how I'm supposed to manage when the response contains data?

Answer 1

I haven't tried this myself, but I would start with creating a wrapper class that has your CustomResponse as a nullable.

Something like this:

public class SomeWrapper {
    @Nullable CustomResponse customResponse;
}

Then in your Retrofit/Rx call, you can change it to this:

@POST("/updateObject")
Observable<SomeWrapper> updateObject(@Body CustomObject requestData);

give that a shot, and let me know if it works.