Error: java.lang.IllegalStateException: Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 2 path $ - RxJava

Question

I am calling an API using RxJava and Retrofit and storing the data in data class of kotlin. While calling the api, an error is thrown : java.lang.IllegalStateException: Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 2 path $.

Here is the code:

API JSON:

{
    "facilities": [
        {
            "facility_id": "1",
            "name": "Property Type",
            "options": [
                {
                    "name": "Apartment",
                    "icon": "apartment",
                    "id": "1"
                },
                {
                    "name": "Condo",
                    "icon": "condo",
                    "id": "2"
                },
                {
                    "name": "Boat House",
                    "icon": "boat",
                    "id": "3"
                },
                {
                    "name": "Land",
                    "icon": "land",
                    "id": "4"
                }
            ]
        },
        {
            "facility_id": "2",
            "name": "Number of Rooms",
            "options": [
                {
                    "name": "1 to 3 Rooms",
                    "icon": "rooms",
                    "id": "6"
                },
                {
                    "name": "No Rooms",
                    "icon": "no-room",
                    "id": "7"
                }
            ]
        },
        {
            "facility_id": "3",
            "name": "Other facilities",
            "options": [
                {
                    "name": "Swimming Pool",
                    "icon": "swimming",
                    "id": "10"
                },
                {
                    "name": "Garden Area",
                    "icon": "garden",
                    "id": "11"
                },
                {
                    "name": "Garage",
                    "icon": "garage",
                    "id": "12"
                }
            ]
        }
    ],
    "exclusions": [
        [
            {
                "facility_id": "1",
                "options_id": "4"
            },
            {
                "facility_id": "2",
                "options_id": "6"
            }
        ],
        [
            {
                "facility_id": "1",
                "options_id": "3"
            },
            {
                "facility_id": "3",
                "options_id": "12"
            }
        ],
        [
            {
                "facility_id": "2",
                "options_id": "7"
            },
            {
                "facility_id": "3",
                "options_id": "12"
            }
        ]
    ]
}

The data class for serialization:: (FacilitiesData.kt)

data class Facilities(
    @SerializedName("facilities")
    val facilities: List<Facility>
)

data class Facility(
    @SerializedName("facility_id")
    val facility_id: String?,
    @SerializedName("name")
    val name: String?,
    @SerializedName("options")
    val options: List<Options>
)

data class Options(
    @SerializedName("name")
    val name: String?,
    @SerializedName("icon")
    val icon: String?,
    @SerializedName("id")
    val id: String?
)

RxJava code to fetch the response:

  private fun fetchFacilities() {
        loading.value = true
        disposable.add(
            facilityService.getFacilities()
                .subscribeOn(Schedulers.newThread())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribeWith(object: DisposableSingleObserver<List<Facilities>>() {
                    override fun onSuccess(value: List<Facilities>?) {
                        facilities.value = value
                        loadError.value = false
                        loading.value = false
                    }

                    override fun onError(e: Throwable?) {
                        Log.e("Error", e.toString())
                        loadError.value = true
                        loading.value = false
                    }

                })
        )
    }

The interface to fetch the api: (FacilityApi)

interface FacilityApi {

    @GET("/iranjith4/ad-assignment/db")
    fun getFacilities() : Single<List<Facilities>>
}

Service class to call the service api (FacilityService)

class FacilityService {

    @Inject
    lateinit var api: FacilityApi

    init {
        DaggerApiComponent.create().inject(this)
    }

    fun getFacilities(): Single<List<Facilities>> {
        return api.getFacilities()
    }
}

What can be the possible reason for the error? Please let me know.

I think you want fun getFacilities() : Single<Facilities>. Your Facilities class is the root. — Eric Cochran
– Eric Cochran, Commented Jul 2, 2023 at 17:29

Christian · Accepted Answer · 2023-07-02 14:36:15Z

1

The JSON you are showing is an Object defined by the { that contains an array named facilities the definition of your Code needs to consider this and expect an object that contains an array called facilities. At the moment your code expects an Array at root level.

answered Jul 2, 2023 at 14:36

Christian

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zaid khan · Accepted Answer · 2023-07-02 17:10:07Z

1

try changing the return type of your get function to Facilities

interface FacilityApi {

    @GET("/iranjith4/ad-assignment/db")
    fun getFacilities() : Facilities
}

answered Jul 2, 2023 at 17:10

zaid khan

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