无法使用 Retrofit 通过带有参数的 @POST 请求解析 JSON 响应

Question

So i'm trying to handle and print a JSON response to my server and I'm getting the error:

java.lang.IllegalStateException: Expected a string but was BEGIN_ARRAY at line 1 column 1376 path $.scope

Here what my project looks like:

object RetrofitClientInstance {

private var retrofit: Retrofit? = null
private val BASE_URL = "http://security-xxx.xxx.xxx.corp"

//create a retrofit instance, only if its not created yet
val retrofitInstance: Retrofit?
    get() {

        val okHttpClient = OkHttpClient.Builder()
            .readTimeout(60, TimeUnit.SECONDS)
            .writeTimeout(60, TimeUnit.SECONDS)
            .connectTimeout(60, TimeUnit.SECONDS)
            .build()

        if (retrofit == null) {
            retrofit = Retrofit.Builder()
                .baseUrl(BASE_URL)
                .client(okHttpClient)
                .addConverterFactory(GsonConverterFactory.create())
                .addCallAdapterFactory(RxJava2CallAdapterFactory.create())
                .build()
        }
        return retrofit
    }

}

interface GetApiService {

@GET("/xxx/token")
fun getToken(@Header("Authorization") token: String): Call<TokenResponse>

@FormUrlEncoded
@POST("/oauth/token")
fun requestTokenFromEP(
    @Field("client_id") clientId: String,
    @Field("client_secret") clientSecret: String,
    @Field("grant_type") grantType: String,
    @Field("username") username: String,
    @Field("password") password: String,
    @Field("role") role: String
) : Call<TokenResponse>

This is My DTO class

data class TokenResponse(
    @SerializedName("access_token")
    var accessToken: String,
    @SerializedName("token_type")
    var tokenType: String,
    @SerializedName("refresh_token")
    var refreshToken: String,
    @SerializedName("scope")
    var scope: String
)

My Activity

private fun doTokenRequest(){
    //get service
    val service = RetrofitClientInstance.retrofitInstance?.create(GetApiService::class.java)
    //do call
    val call = service?.requestTokenFromEP(TokenUtils.clientId, TokenUtils.clientSecret, TokenUtils.grantType,TokenUtils.username, TokenUtils.password, TokenUtils.role)
    //process it
    call?.enqueue(object : retrofit2.Callback<TokenResponse>{
        override fun onFailure(call: Call<TokenResponse>, t: Throwable) {
            println("failed: " + t.message)
        }

        override fun onResponse(call: Call<TokenResponse>, response: Response<TokenResponse>) {
            println("success")
            var myList: TokenResponse = response.body()!!
            println(myList.toString())
        }

    })

}

JSON Expected Response

{
    "access_token": "xxxxx",
    "token_type": "xxxxx",
    "refresh_token": "xxxxxxx",
    "expires_in": 553,
    "scope": "read"
}

Please guys if you can help me I would like to understand

Answer 1

Hi guys I already figure out the answer:

In my model class the "scope" variable was of type string but my JSON was returning an Array, hence why the app was returning an error.

The JSON response returned: "scope": [ "read", "write"]