CODEWITHSUNDEEP
androidretrofit2
ImDevinC
ImDevinC

Reputation: 528

Retrofit 2 Expected BEGIN_OBJECT but was BEGIN_ARRAY

I have a JSON object that looks like this: 

[[{
    "customers_id": 0
    "name": "John Doe",
    "address": "1234 Merry Way",
    "city": "Miami",
    "zipcode": "55443",
    "state": "Florida"
}, {
    "customers_id": 1
    "name": "John Doe",
    "address": "1234 Merry Way",
    "city": "Miami",
    "state": "Florida"
}, {
    "customers_id": 2
    "name": "John Doe",
    "address": "1234 Merry Way",
    "city": "Miami",
    "state": "Florida"
}],[]

When Retrofit returns, I get the error Expected BEGIN_OBJECT but was BEGIN_ARRAY. My call is set to return a list however: 

@POST("search_clients.php")
Call<List<Course>> GetClients();

My actual retrofit call looks like this: 

Retrofit retrofit = new Retrofit.Builder()
            .baseUrl(BASE_URL)
            .build();

ClientLookup clientLookup = retrofit.create(ClientLookup.class);

Call<List<Client>> clients = clientLookup.GetClients();
clients.enqueue(new Callback<List<Client>>() {
    @Override
    public void onResponse(Response<List<Client>> response) {
        if (!response.isSuccess()) {
            Log.e(TAG, "No Success: " + response.message());
             return;
        }

        Log.d(TAG, response.body().toString());
    }

    @Override
    public void onFailure(Throwable t) {
        Log.e(TAG, "Failure: " + t.getMessage());
    }
});

And lastly my model looks like this: 

public class Client {
  private int customers_id;
  private String name;
  private String address;
  private String city;
  private String zipcode;
  private String state;
}

And lastly a custom converter to remove the leading [ and trailing ,[]

public final class ClientCleaner extends Converter.Factory {
    private static final String TAG = ClientCleaner.class.getName();

    @Override
    public Converter<ResponseBody, Client> responseBodyConverter(Type type, Annotation[] annotations, Retrofit retrofit) {
        return new Converter<ResponseBody, Client>() {
            @Override
            public Client convert(ResponseBody body) throws IOException {
                String returnValue = body.string();
                if (returnValue.startsWith("[")){
                    returnValue = returnValue.substring(1);
                }
                if (returnValue.endsWith(",[]]")){
                    returnValue = returnValue.substring(0, returnValue.length() - 4);
                }
                Log.d(TAG, returnValue);
                Gson gson = new Gson();
                return gson.fromJson(returnValue, Client.class);
            }
        };
    }


}

Any idea why my call is still expecting a BEGIN_OBJECT?

Upvotes: 0

Views: 2060

Answers (1)

headsvk
headsvk

Reputation: 2796

Deserializing of the list is not correct. Refer to this SO question about how to deserialize a list of objects with Gson.

This should be sufficient:

List<Client> videos = gson.fromJson(returnValue, new TypeToken<List<Client>>(){}.getType());

Upvotes: 3

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