<ClassCastException when using Mockito.thenAnswer>...

# stackoverflow

[user]

ClassCastException when using Mockito.thenAnswer
I am new to Kotlin. I get exception when trying to use Mockito's thenAnswer method
Controller:
@RestController
class SampleRestController(
val sampleService: SampleService
) {

@PostMapping(value = ["/sample-endpoint"], consumes = [MediaType.APPLICATION_JSON_VALUE], produces = [MediaType.APPLICATION_JSON_VALUE])
fun sampleEndpoint(@RequestBody values: List): ResponseEntity {
val response = sampleService.serviceCall(values)
return...