Can't recieve byte array using Retrofit 2 in Kotlin - arrays

Question

I have a DTO class using Moshi that's supposed to send and recieve byte arrays[], but it only works when sending them, because when I recieve then I have this exception.
com.squareup.moshi.JsonDataException: Expected BEGIN_ARRAY but was STRING at path $[0].image
But im pretty sure that the type that the API returns is a byte array.
Here's the DTO class and API controller
#JsonClass(generateAdapter = true)
data class LocationImageDTO (
#Json(name="idLocationImage") val idLocationImage: Int,
#Json(name = "idLocation") val idLocation: Int?,
#Json(name="image") val image: ByteArray,
)
//This one is for recieving
public List<clsLocationImage> getList(int idLocation)
{
List<clsLocationImage> list = new List<clsLocationImage>();
clsLocationImage locationImage;
clsMyConnection connection = new clsMyConnection();
SqlCommand command = new SqlCommand
{
CommandText = "SELECT idLocationImage, idLocation, image FROM K0_MAP_LOCATION_IMAGES WHERE idLocation = #idLocation",
Connection = connection.getConnection()
};
command.Parameters.Add("#idLocation", System.Data.SqlDbType.Int).Value = idLocation;
SqlDataReader reader;
try
{
reader = command.ExecuteReader();
if (reader.HasRows)
{
while (reader.Read())
{
locationImage = new clsLocationImage();
locationImage.idLocationImage = (int)reader["idLocationImage"];
locationImage.idLocation = (int)reader["idLocation"];
locationImage.image = (byte[])reader["image"];
list.Add(locationImage);
}
}
}
catch (SqlException excepcion)
{
throw excepcion;
}
return list;
}
public List<clsLocationImage> getListDAL(int id)
{
return getList(id);
}
}
}
///This one is for sending
public int createLocationImage(clsLocationImage locationImage)
{
int filasAfectadas = 0;
clsMyConnection conexion = new clsMyConnection();
SqlCommand miComando = new SqlCommand
{
CommandText = "INSERT INTO K0_MAP_LOCATION_IMAGES(idLocation, image) VALUES (#idLocation, #image)",
Connection = conexion.getConnection()
};
miComando.Parameters.Add("#idLocation", System.Data.SqlDbType.Int).Value = locationImage.idLocation;
miComando.Parameters.Add("#image", System.Data.SqlDbType.VarBinary).Value = locationImage.image;
try
{
filasAfectadas = miComando.ExecuteNonQuery();
}
catch (SqlException excepcion)
{
throw excepcion;
}
return filasAfectadas;
}
}
}

Answer 1

You need to set an explicit JSON adapter to the Moshi Builder.
class CustomDateAdapter : JsonAdapter<Date>() {
private val dateFormat = SimpleDateFormat(SERVER_FORMAT, Locale.getDefault())
#FromJson
override fun fromJson(reader: JsonReader): Date? {
return try {
val dateAsString = reader.nextString()
synchronized(dateFormat) {
dateFormat.parse(dateAsString)
}
} catch (e: Exception) {
null
}
}
#ToJson
override fun toJson(writer: JsonWriter, value: Date?) {
if (value != null) {
synchronized(dateFormat) {
writer.value(value.toString())
}
}
}
companion object {
const val SERVER_FORMAT = ("yyyy-MM-dd'T'HH:mm") // define your server format here
}
}
And then you add it in the Moshi builder
private val moshiBuilder = Moshi.Builder().add(CustomDateAdapter())
private fun getRetrofit(): Retrofit =
Retrofit.Builder()
.baseUrl(MAPK0_API_BASE_URL)
.addConverterFactory(MoshiConverterFactory.create(moshiBuilder.build()))
//.client(getUnsafeOkHttpClient())
.build()
}