GSON error: Expected BEGIN_OBJECT but was STRING at line 1 column 1 path $. Why am I getting this er-CodePudding

I created a token based login function using retrofit, however I'm getting this error:

com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was STRING at line 1 column 1 path $

I already added Accept header in my interface:

interface MyApi
{
  @Headers("Accept:application/json")
  @POST(Constants.LOGIN_URL)
  fun login(@Body request : LoginRequest) : Call<LoginResponse>
}

I also set lenient as true in my GSON builder:

class ApiClient
{
  private lateinit var apiService : MyApi

  private val gson = GsonBuilder()
    .setLenient()
    .create()

  fun getApiService(context : Context): MyApi {
    if (!::apiService.isInitialized) {
        val retrofit = Retrofit.Builder()
            .baseUrl(Constants.BASE_URL)
            .addConverterFactory(GsonConverterFactory.create(gson))
            .client(okhttpClient(context))
            .build()

        apiService = retrofit.create(MyApi::class.java)
    }
    return apiService
}

   private fun okhttpClient(context : Context) : OkHttpClient {
    return OkHttpClient.Builder()
        .addInterceptor(AuthInterceptor(context))
        .build()
   }

}

My data class looks like this:

data class LoginRequest(
    @SerializedName("email") var email : String ,
    @SerializedName("password") var password : String ,
    @SerializedName("device_name") var device_name : String = "android")

data class LoginResponse(
    @SerializedName("status_code") var status_code : Int ,
    @SerializedName("auth_Token") var authToken : String ,
    @SerializedName("user") var user : User)

data class User(
    @SerializedName("id") var id : String ,
    @SerializedName("username") var username : String ,
    @SerializedName("first_name") var firstName : String ,
    @SerializedName("last_name") var lastName : String ,
    @SerializedName("email") var email : String)

Can someone help me in this problem?

Tried doing it in postman and this is the response:

If credentials is incorrect:

{
"message": "The provided credentials are incorrect.",
"errors": {
    "email": [
        "The provided credentials are incorrect."
    ]
}
}

If correct:

118|uv9iD1wJHpchg49kmOM1ZvNkg5PPuMeZ4QNl5N0r

CodePudding user response：

response is not correctly formated in JSON format. please debug response from server and validate it

json object start like {"data":"value"}, but the response you are receiving is not like valid JSON, it is simple string...

CodePudding user response：

The problem is you try to call JSON object with the LoginResponse data class but the response is just a string, not a JSON. You can change your function on Api Interface like this

fun login(@Body request : LoginRequest) : Call<String>