我正在为一家使用MVVM和干净架构的公司构建应用程序，因此我创建了3个模块，即应用程序模块（表示层），数据模块（数据层）&域模块（域/交互器层）。现在，在我的数据模块中，我使用Retrofit和Gson自动将从登录POST请求中接收到的JSON转换为名为NetUserSession的Kotlin数据类，如下所示。我遇到的问题是日志拦截器正常打印包含数据的响应，但是response.body()返回了一个空的NetUserSession对象，其中包含null值，这让我认为自动转换由于某种原因没有发生。有人能告诉我我在这里做错了什么吗？
Koin模块：

val domainModule = module {
            single<LoginRepository> {LoginRepositoryImpl(get())}
            single { LoginUseCase(get()) }
        }
        val presentationModule = module {
            viewModel { LoginViewModel(get(),get()) }
        }
        val dataModule = module {
            single { ApiServiceImpl().getApiService() }
            single { LoginRepositoryImpl(get()) }
        }
}

API接口和改造：

interface ApiService {
    @POST("Login")
    fun getLoginResult(@Body netUser: NetUser) : Call<NetUserSession>

    @GET("Books")
    fun getBooks(@Header("Authorization") token:String) : Call<List<NetBook>>
}

class ApiServiceImpl {
    fun getApiService(): ApiService {
        val logging = HttpLoggingInterceptor()
        logging.setLevel(HttpLoggingInterceptor.Level.BODY)
        //TODO:SP Remove the interceptor code when done debugging
        val client: OkHttpClient = OkHttpClient.Builder()
            .addInterceptor(logging)
            .build()

        val retrofit = Retrofit.Builder().baseUrl(baseUrl)
            .addConverterFactory(GsonConverterFactory.create())
            .client(client)
            .build()
        // tell retrofit to implement the interface of our api
        return retrofit.create(ApiService::class.java)
    }
}

网络用户会话：

data class NetUserSession(
    @SerializedName("expires_in")
    val expires_in: Int,
    @SerializedName("token_type")
    val token_type: String,
    @SerializedName("refresh_token")
    val refresh_token: String,
    @SerializedName("access_token")
    val access_token: String
) {
    fun toUserSession(): UserSession = UserSession(
        expiresIn = expires_in,
        tokenType = token_type,
        refreshToken = refresh_token,
        accessToken = access_token
    )
}

域中的用户会话：

data class UserSession(
    val expiresIn:Int,
    val tokenType:String,
    val refreshToken:String,
    val accessToken:String
)

发生错误的LoginRepositoryImpl：

class LoginRepositoryImpl(private val apiService: ApiService) : LoginRepository {

    override suspend fun login(username:String,password:String): UserSession? = withContext(Dispatchers.IO){
        val response = apiService.getLoginResult(NetUser(username,password)).awaitResponse()
        println("THE RESPONSE WAS : ${response.body()}")
        return@withContext if(response.isSuccessful) response.body()?.toUserSession() else null
    }
}

200-OK后的LoggingInterceptor结果：

{"expires_in":3600,"token_type":"Bearer","refresh_token":"T1amGR21.IdKM.5ecbf91162691e15913582bf2662e0","access_token":"T1amGT21.Idup.298885bf38e99053dca3434eb59c6aa"}

Response.body（）打印结果：

THE RESPONSE WAS : NetUserSession(expires_in=0, token_type=null, refresh_token=null, access_token=null)

你知道我没看到什么吗？