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Retrofit2 post request returns 500 error but postman works well

I've tried many solutions on Stackoverflow. but not work..
please help me...
Retrofit2 POST request returns 500 error. but postman works well.
but If i changed property name of Jsonobject, works well. postman too.
Detail below.
I asked the server team, but they said there was no problem.
So can you check if there is a problem with my code?
Interface
`interface LoginService {
#POST("api/v1/login") // POST
fun requestLogin( // Input
#Body loginData: JsonObject
): Call<LoginResponse> // Output`
LoginActivity
`class LoginActivity : AppCompatActivity() {
private lateinit var viewBinding : ActivityLoginBinding
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
viewBinding = ActivityLoginBinding.inflate(layoutInflater)
setContentView(viewBinding.root)
// client
val clientBuilder = OkHttpClient.Builder()
val loggingInterceptor = HttpLoggingInterceptor()
loggingInterceptor.level = HttpLoggingInterceptor.Level.BODY
clientBuilder.addInterceptor(loggingInterceptor)
clientBuilder.retryOnConnectionFailure(true)
// retrofit
val retrofit = Retrofit.Builder()
.baseUrl("secret")
.addConverterFactory(ScalarsConverterFactory.create())
.addConverterFactory(GsonConverterFactory.create())
.client(clientBuilder.build()) // client
.build()
val userid = viewBinding.idt.text.toString()
val password = viewBinding.pwdt.text.toString()
val login = JsonObject()
login.addProperty("userId", userid)
login.addProperty("password", password)
val loginService = retrofit.create(LoginService::class.java)
viewBinding.signinbtn.setOnClickListener {
loginService.requestLogin(login).enqueue(object: Callback<LoginResponse>{
override fun onResponse(call: Call<LoginResponse>, response: Response<LoginResponse>) {
if (response.isSuccessful){
val responseData = response.body()
if (responseData != null) {
Log.d("Retrofit","ResponseCode: ${responseData.code} Message: ${responseData.message}")
if (responseData.code == 1000) {
val intent = Intent(this#LoginActivity, CalendarActivity::class.java)
startActivity(intent)
}
if (responseData.code != 1000) {
cuDialog(viewBinding.root, responseData.message)
}
if (responseData.code == 1000 && viewBinding.auto.isChecked) {
}
}
}
else {
Log.w("Retrofit", "Response Not Successful ${response.code()}")
}
}
override fun onFailure(call: Call<LoginResponse>, t: Throwable) {
Log.e("Retrofit","Error!",t)
val dialog = AlertDialog.Builder(this#LoginActivity)
dialog.setTitle("오류")
dialog.setMessage("서버와 통신에 실패했습니다.")
dialog.show()
}
})
}`
data class (Response)
data class LoginResponse( val isSuccess: Boolean, val code: Int, val message: String, val result: ArrayList<Info>)
error message
enter image description here
IN Postman
enter image description here
postman works well
But what's even more strange is that if I change the name of the property randomly, it responds well. Below is an example.
val login = JsonObject() login.addProperty("sdfsfssdfd", userid) login.addProperty("sfsfdsfsd", password)
I changed this part. property name is random.
enter image description here
In AndroidStudio, works well.
enter image description here
of course, postman works well too.
why if Property name is "userId", not working?
please help me..

From your side userId and password parameters are blank. I have seen on your error screenshot.
Try to Log your userId and password.
val userid = viewBinding.idt.text.toString() // I think issue is here
val password = viewBinding.pwdt.text.toString() // I think issue is here
login.addProperty("userId", userid)
login.addProperty("password", password)

How to Parse Json in Kotlin Using Retrofit?

i am new to kotlin and i am in learning phase. I have followed many links but didn't able to understand completely.
I want Json response to show in my textview.
Problem: 1
I have tried this code but was unable to get data, but i want to get the items inside data object. Quote and author are coming null.
{
"status": 200,
"message": "Success",
"data": {
"Quote": "The pain you feel today will be the strength you feel tomorrow.",
"Author": ""
},
"time": "0.14 s"
}
Problem: 2
I dont know how to parse this response in textview
object ServiceBuilder {
private val client = OkHttpClient.Builder().build()
private val retrofit = Retrofit.Builder()
.baseUrl("https://url.com.pk/") // change this IP for testing by your actual machine IP
.addConverterFactory(GsonConverterFactory.create())
.client(client)
.build()
fun<T> buildService(service: Class<T>): T{
return retrofit.create(service)
}}
RestApi
interface RestApi{
#Headers("Content-Type: application/json")
#POST("api/getquotes")
abstract fun addUser(#Body userData: UserInfo): Call<UserInfo>}
RestAPiService
class RestApiService
{
fun addUser(userData: UserInfo, onResult: (UserInfo?) -> Unit)
{
val retrofit = ServiceBuilder.buildService(RestApi::class.java)
retrofit.addUser(userData).enqueue(
object : Callback<UserInfo>
{
override fun onFailure(call: Call<UserInfo>, t: Throwable)
{
onResult(null)
}
override fun onResponse( call: Call<UserInfo>, response: Response<UserInfo>)
{
val addedUser = response.body()
Log.d("responsee",""+addedUser)
onResult(addedUser)
}
}
)
}
}
UserInfo
data class UserInfo (
#SerializedName("Quote")
val quote : String,
#SerializedName("Author")
val author : String
)
MainActivity
fun getQuotes() {
val apiService = RestApiService()
val userInfo = UserInfo("","")
apiService.addUser(userInfo) {
Log.d("Error registering user","errter")
/*if ( != null)
{
// it = newly added user parsed as response
// it?.id = newly added user ID
} else {
Log.d("Error registering user","errter")
}*/
}
}
Any help would be appreciated :)

Status, message and data are all part of the response so you need to take care of that. For example this
data class AddUserResponse(
val `data`: UserInfo, //like you defined it
val message: String,
val status: Int,
val time: String
)
This means parameter and response are different so the RestApi needs to be changed to this
abstract fun addUser(#Body userData: UserInfo): Call<AddUserResponse>}
This in turn also change the types in the service like
class RestApiService
{
fun addUser(userData: UserInfo, onResult: (UserInfo?) -> Unit)
{
val retrofit = ServiceBuilder.buildService(RestApi::class.java)
retrofit.addUser(userData).enqueue(
object : Callback<AddUserResponse>
{
override fun onFailure(call: Call<AddUserResponse>, t: Throwable)
{
onResult(null)
}
override fun onResponse( call: Call<AddUserResponse>, response: Response<AddUserResponse>)
{
val addedUser = response.body()
Log.d("responsee",""+addedUser)
onResult(addedUser.data)
}
}
)
}
}
now in getQuotes you will have that it is a UserInfo object
apiService.addUser(userInfo) {
val returnedUserInfo = it
}

just follow my steps :
File->settings->Plugins
search for JSON To Kotlin class and install it
again click on File->New->Kotlin Data class from JSON
paste your json code here and click on generate. It will generate POJO classes and you will good to go.

The first thing I noticed, is that the data in your json is:
"Quote": "The pain you feel today will be the strength you feel tomorrow.",
"Author": ""
While your UserInfo defined #SerializedName("message") for Quote.

How to parse response with retrofit2 Kotlin

I'm stuck with parsing the response. In Swift I can make a codable to help parsing the json response. I'm new to Kotlin and I'm working on someone else existing project. I made a data class for string and boolean but I don't know the syntax to parse it. Please help and thank you.
The responseBody json
{
"bearerToken": "########",
"staySignIn": false
}
//Interface
interface PostInterface {
class User(
val email: String,
val password: String
)
#POST("signIn")
fun signIn(#Body user: User): Call<ResponseBody>
//Network handler
fun signIn(email: String, password: String): MutableLiveData<Resource> {
val status: MutableLiveData<Resource> = MutableLiveData()
status.value = Resource.loading(null)
val retrofit = ServiceBuilder.buildService(PostInterface::class.java)
retrofit.signIn(PostInterface.User(email, password)).enqueue(object : Callback<ResponseBody> {
override fun onFailure(call: Call<ResponseBody>, t: Throwable) {
errorMessage(status)
}
override fun onResponse(call: Call<ResponseBody>, response: Response<ResponseBody>) {
if (response.code() == 200) {
try {
status.value = //how to parse using the model??
} catch (ex: Exception) {
parseError(400, response.body().toString(), status)
}
} else {
//do something...
}
}
})
return status
}
//Model
data class SignInModel(
#field:SerializedName("bearerToken")
val bearerToken: String? = null,
#field:SerializedName("staySignIn")
val staySignIn: Boolean? = null
)
//Storing value class
class RrefManager constructor(var applicationContext: Context) {
private fun getSharedPrefEditor(): sharedPrefEditor.Editor {
return applicationContext.getSharedPrefEditor(prefStorageName, Context.MODE_PRIVATE).edit()
}
public fun setBearerToken(token: String) {
getSharedPrefEditor().putString("bearerToken", token).apply()
}
public fun setStaySignIn(enabled: Boolean) {
getSharedPrefEditor().putBoolean("staySignIn", enabled).apply()
}
}
//SignIn Button
viewModel.signIn().observe(viewLifecycleOwner, androidx.lifecycle.Observer { v ->
if (v.status == Resource.Status.SUCCESS) {
val model = v.data as SignInModel
pref.setToken(model.token as String) //storing value
pref.setTwoFactorEnabled(model.twoFactorEnabled as Boolean) //storing value
} else if (v.status == Resource.Status.ERROR) {
//do something...
}
})

I think your best option to achieve something like the codable in swift is to use Gson library for parsing api responses.
When you create the retrofit instance you pass the gson converter to the builder like:
val retrofit = Retrofit.Builder()
.baseUrl(BaseUrl)
.addConverterFactory(GsonConverterFactory.create())
.build()
After you have done that you can make the api return the response you have as the data class, like:
//Interface
interface PostInterface {
#POST("signIn")
fun signIn(#Body user: User): Call<SignInModel>
}
To read the answer from the callback on your class, the response inside the network call is already parsed into your model in the callback. All the retrofit callback should be changed to receive Callback and then you can access directly like status.value = response.body()
For more info you can consult the retrofit library page where it gives all the details and explanations on how to use it correctly.
https://square.github.io/retrofit/

Kotlin Retrofit Error: "Expected BEGIN_OBJECT but was string"

I am working on an android project. I use Kotlin and I'm just learning it. I want to use Retrofit 2 for my request. I use Java this method and it is done.
I want to register user my database. When I use my function, return success for web services but it saves the empty value and I take this error: "Expected BEGIN_OBJECT was string at line 3 column 1 path$". How we can solve this problem? Actually, I read and implementing other solutions but they don't work for me.
My API:
#POST("userregister.php")
fun doRegister(
#Body signupRequest: SignupRequest
): Call<SignupResponse> // body data
My API Service:
object ApiServiceWithOutRX {
private const val BASE_URL = "https://alperenyukselaltug.com/api/TurkAi/"
var gson = GsonBuilder()
.setLenient()
.create()
fun ApiCall() = Retrofit.Builder()
.baseUrl(BASE_URL)
.addConverterFactory(ScalarsConverterFactory.create())
.addConverterFactory(GsonConverterFactory.create(gson))
.client(ApiWorker.client)
.build()
.create(APIListWithOutRX::class.java)!!
}
And my register function:
val email = editTextMail!!.text.toString().trim()
val password = editTextPassword!!.text.toString().trim()
val json = JSONObject()
json.put("UserEmail", email)
json.put("UserPassword", password)
json.put("UserProfilePicture", "")
ApiServiceWithOutRX.ApiCall().doRegister(
SignupRequest(
email,
password,
""
)
).enqueue(object : Callback<SignupResponse> {
override fun onResponse(
call: Call<SignupResponse>,
response: Response<SignupResponse>
) {
Log.d("Response::::", response.body().toString())
val loginResponse: SignupResponse
loginResponse = response.body()!!
if (loginResponse.status) {
finish()
} else {
Toast.makeText(applicationContext, response.body()!!.message, Toast.LENGTH_LONG)
.show()
}
}
override fun onFailure(call: Call<SignupResponse>, t: Throwable) {
Toast.makeText(applicationContext, t.message, Toast.LENGTH_LONG).show()
}
})
My Model:
data class User(
#SerializedName("UserEmail")
val UserEmail: String?,
#SerializedName("UserPassword")
val UserPassword: String?,
#SerializedName("UserProfilePicture")
val UserProfilePicture: String?
)
class SignupResponse(val status: Boolean, val message:String, val data: User)
class SignupRequest(#SerializedName("UserEmail") var UserEmail: String,
#SerializedName("UserPassword") var UserPassword: String,
#SerializedName("UserProfilePicture") var UserProfilePicture: String)

I solve this problem. First, I return my server side a string with PHP in echo. I return a string value. So I change my #Post like this:
#FormUrlEncoded
#POST("userregister.php")
fun doRegister(
#Field("UserEmail") UserEmail:String,
#Field("UserPassword") UserPassword:String,
#Field("UserProfilePicture") UserProfilePicture:String
):Call<String>

Empty response body on retrofit call

I have a app whos call a service POST (postman test) and get some information from that call.
My retrofit initializer:
class RetrofitInitializer {
private val retrofit = Retrofit.Builder()
.baseUrl("https://bank-app-test.herokuapp.com/api/")
.addConverterFactory(GsonConverterFactory.create())
.build()
fun loginApiContract() : LoginApiContract{
return retrofit.create(LoginApiContract::class.java)
}
}
the interface:
interface LoginApiContract {
#POST("login")
fun login() : Call<UserAccount>
#GET("statements")
fun getStatements()
}
and finally the call:
val call = RetrofitInitializer().loginApiContract().login()
call.enqueue(object: Callback<UserAccount> {
override fun onResponse(call: Call<UserAccount?>?,
response: Response<UserAccount?>?) {
response?.body()?.let {
val myUserAccount: UserAccount = it
loginView.doLogin(myUserAccount)
}
}
override fun onFailure(call: Call<UserAccount?>?,
t: Throwable?) {
Log.e("onFailure error", t?.message)
}
})
I got response code 200, but response body is empty.
This is my postman response:
{
"userAccount": {
"userId": 1,
"name": "Jose da Silva Teste",
"bankAccount": "2050",
"agency": "012314564",
"balance": 3.3445
},
"error": {}
}
and this is my model:
class UserAccount constructor(var userId: Int, var name: String, var bankAccount: String, var agency: String, var balance: Double){
init{
this.userId = userId
this.name = name
this.bankAccount = bankAccount
this.agency = agency
this.balance = balance
}
}

I found!
Its a problem with my postman. For any reason my AVD cant access the mock server. now i solve my problem with a simple restful api node.js.
Thx for the help guys.

Your response contains elements named "userAccount" and "error". Your UserAccount class has neither which is causing the issue. Therefore, use Retrofit with a class like this:
data class UserResponse(val userAccount: UserAccount, val error: BackendError)