[Retrofit]: Expected BEGIN_OBJECT but was BEGIN_ARRAY

Question

This error is back !

I'm a beginner with Retrofit, I've saw this post: Retrofit: Expected BEGIN_OBJECT but was BEGIN_ARRAY

But I still can't make it work even if I try to adapt it to my model. So my error is:

Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 55 path $[0].genericDevice

What I get:

[ { "deviceUuid": "btB4:99:4C:59:F8:1F", "genericDevice": { "manufacturerName": "BeeWi", "productName": "BeeWi BBL207", "smartFunctions": [ "switch", "rgbled", "whiteled" ] } }, { "deviceUuid": "btD0:39:72:B8:93:F2", "genericDevice": { "manufacturerName": "AwoX", "productName": "SML-c9", "smartFunctions": [ "switch", "whiteled", "rgbled" ] } }, { "deviceUuid": "bt20:C3:8F:E4:B2:2A", "genericDevice": { "manufacturerName": "Iwedia", "productName": "RTRKSP", "smartFunctions": [ "switch", "smartmeter" ] } }, { "deviceUuid": "btA0:14:3D:0C:D3:74", "genericDevice": { "manufacturerName": "Parrot", "productName": "Flower power", "smartFunctions": [ "switch", "battery", "plantmanager" ] } }, { "deviceUuid": "bt78:A5:04:5A:0B:36", "genericDevice": { "manufacturerName": "BeeWi", "productName": "BeeWi SmartClim", "smartFunctions": [ "temperaturehumidity" ] } }, { "deviceUuid": "bt54:4A:16:59:E4:86", "genericDevice": { "manufacturerName": "AwoX", "productName": "AL-Bc7", "smartFunctions": [ "switch", "rgbled", "whiteled", "oildiffuser" ] } } ]

The parsing class' attributes:

private String deviceUuid; private IoTGenericDevice ioTGncDvc;

The IoTGenericDevice subclass' attributes:

public String manufacturerName; public String productName; public ArrayList<String> smartFunctions = new ArrayList<String>();

The Retrofit call:

@GET("/iot/scanning") public void getIoTs(@Header(Auth.ID_SESSION_HEADER) String idSession, Callback<IoT[]> cbk);

The Manager:

public void getIoTs(final CallbackIoTs cbkIoTs) { AdapterUtils.createBboxService(bbox, IBboxIoTService.class).getIoTs (bbox.getSessionId(), new Callback<List<IoT>>() //REST call { @Override public void success(List<IoT> iots, Response rsp) { int statCode = rsp.getStatus(); if (statCode == 200) { List<IoT> iotLst = Arrays.asList(iots); Log.e(LOG_TAG, iotLst.get(0).getIoTGncDvc().getMnf()); cbkIoTs.onResult(statCode, iotLst); } else { Log.e(LOG_TAG, "Unexpected response while getting IoTs. HTTP code: " + String.valueOf(statCode) + " - 200 expected"); cbkIoTs.onResult(statCode, null); } } @Override public void failure(RetrofitError rtfErr) { int statCode = 500; if (rtfErr.getResponse() != null) statCode = rtfErr.getResponse().getStatus(); Log.e(LOG_TAG, "Error while getting IoTs. HTTP code: " + String.valueOf(statCode) + " - Server response: " + rtfErr.getMessage()); cbkIoTs.onResult(statCode, null); } }); }

I'm not sure, but I think that is a problem with the data sent from the server. It's not in JSON format I guess. I used to have this problem, since sometimes server responds differently — capt.swag
– capt.swag, Commented Sep 1, 2015 at 9:21
your error is the other way around, expected array but found object!, although your json is valid as JsonArray, so it might be a typo?anyways try this Callback<IoT[].class>, — Yazan
– Yazan, Commented Sep 1, 2015 at 9:27

Mikelis Kaneps · Accepted Answer · 2015-09-02 10:04:45Z

1

This should be the object:

public class Test{ @Expose private String deviceUuid; @Expose private GenericDevice genericDevice; }

And this is Generic Device object:

public class GenericDevice { @Expose private String manufacturerName; @Expose private String productName; @Expose private List<String> smartFunctions = new ArrayList<String>(); }

Retrofit call:

@GET("/iot/scanning") public void getIoTs(@Header(Auth.ID_SESSION_HEADER) String idSession, Callback<List<Test>> cbk);

Adapter call:

AdapterUtils.createBboxService(bbox, IBboxIoTService.class).getIoTs (bbox.getSessionId(), new Callback<List<Test>>(){...}

edited Sep 2, 2015 at 10:04

answered Sep 1, 2015 at 11:04

Mikelis Kaneps

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7 Comments

X.LINK Over a year ago

I made the changes you've suggested. but got the same error, maybe I made something wrong. I put the related code in "The Manager" section of my first post.

X.LINK Over a year ago

Things have changed a little (parsing class attributes, Retrofit call and Manager updated + IoTGenericDevice subclass added), but when I'm fetching my IoT lists in my manager and LOG_TAG it, the subclasses GenericDevice seems null. Did I missed something ?

Mikelis Kaneps Over a year ago

@X.LINK check if the name in the class is the same as in json, and check if you have added "@Expose."

Mikelis Kaneps Over a year ago

yes, "@Expose" is not needed if you don't make it needed creating Gson, but if you ever need a field inside the class that you don't need to parse, "@Expose" and special Gson could come in handy. That's good that your problem is solved.

Mikelis Kaneps Over a year ago

I am not sure where. But you could use this, if you want different name for the field- "@SerializedName("items_count") @Expose int itemsCount;"

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