Multipart request with Retrofit @PartMap Error in Kotlin (Android)

Question

If I am using this code in Java then its working fine. When I convert that code in kotlin then I got Error.

Logcat

08-20 23:46:51.003 3782-3782/

Answer 1

Add @JvmSuppressWildcards before RequestBody

fun updateCustomerDetail(@PartMap map: Map<String, @JvmSuppressWildcards RequestBody >): Call<UpdateCustomer>

Answer 2

Use HashMap or MutableMap instead of Map< K, out V> for the PartMap

Alternative way that works fine for me. Mentioned by tpom6oh in Retrofi Kotlin Issue

I think it's happening because the Map declaration is public interface Map< K, out V> and the out word makes the value type generic. You can try to use MutableMap or HashMap instead.

@Multipart
@POST("customer")
fun updateCustomerDetail(@PartMap map: HashMap<String, RequestBody>): Call<UpdateCustomer>