Why response.body() its null?

Question

Im using retrofit to send a a json object to the server, im trying to create a user, im sending this json object

{"apellido":"prueba","email":"[email protected]","fechaDeNacimiento":"11/29/1998","formaDeRegistro":"Android","nombre":"prueba","password":"12345678","username":"prueba"}

In this example i create a invalid user , so the server response with a json object where code its the code error and message its the explication of the error

[{"code":"5","message":"The email is in use"}]

Interface

public interface UserClient {





@POST("usuarios")

Call<Usuarios> create(@Body Usuarios usuario);

}

Data model

import com.google.gson.annotations.SerializedName;

public class Usuarios {



@SerializedName("username")

String username;

@SerializedName("email")

String email;

@SerializedName("password")

String password;

@SerializedName("nombre")

String nombre;

@SerializedName("apellido")

String apellido;

@SerializedName("fechaDeNacimiento")

String fechaDeNacimiento;

@SerializedName("formaDeRegistro")

String formaDeRegistro;



 String message;





public Usuarios(String email, String username, String password, String nombre, String apellido, String fechaDeNacimiento, String formaDeRegistro){

    this.username=username;

    this.email=email;

    this.password=password;

    this.nombre = nombre;

    this.apellido= apellido;

    this.fechaDeNacimiento = fechaDeNacimiento;

    this.formaDeRegistro = formaDeRegistro;

}



public String getMessage(){

    return message;

}

}

and Retrofit implement

 OkHttpClient.Builder okhttpClientBuilder=new OkHttpClient.Builder();

    HttpLoggingInterceptor loggin=new HttpLoggingInterceptor();

    loggin.setLevel(HttpLoggingInterceptor.Level.BODY);

    okhttpClientBuilder.addInterceptor(loggin);

    Retrofit.Builder builder = new Retrofit.Builder()

            .baseUrl("https://intense-lake-39874.herokuapp.com")

            .addConverterFactory(GsonConverterFactory.create())

            .client(okhttpClientBuilder.build());



    Retrofit retrofit = builder.build();





    UserClient service = retrofit.create(UserClient.class);

    Call<Usuarios> call = service.create(usuario);



    call.enqueue(new Callback<Usuarios>() {

        @Override

        public void onResponse(Call<Usuarios> call, Response<Usuarios> response) {



            Toast.makeText(Main2Activity.this,"Usuario Registrado! "+response.body().getMessage,Toast.LENGTH_SHORT).show();



        }



        @Override

        public void onFailure(Call<Usuarios> call, Throwable t) {

                Toast.makeText(Main2Activity.this,"Algo fallo..",Toast.LENGTH_SHORT).show();



        }

    });

}

So i can see the logcat response but in the body its appoint to null, how i can acces to the "message"?

This is the logcat

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Answer 1

That error is because your response is not successful therefore you need to parse the error body, try with this code:

if (response.isSuccessful()) { 
// Do your success stuff...
 } else
 { 
try 
{ 
JSONObject jObjError = new JSONObject(response.errorBody().string());
 Toast.makeText(getContext(), jObjError.getString("message"), Toast.LENGTH_LONG).show();
 } catch (Exception e) {
 Toast.makeText(getContext(), e.getMessage(), Toast.LENGTH_LONG).show();
} 
}

Of course that you can use another parser like Gson .

Why response.body() its null?

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