SMSController.kt

import com.twilio.http.TwilioRestClient
import com.twilio.rest.api.v2010.account.MessageCreator
import com.twilio.type.PhoneNumber
// ...
@RequestMapping(value = "/sendMessage")
fun sendMessage(){

    val client = TwilioRestClient.Builder("YOUR_TWILIO_ACCOUNT_SID", "YOUR_TWILIO_AUTH_TOKEN").build()

    val message = MessageCreator(
            PhoneNumber("YOUR_PHONE_NUMBER"),
            PhoneNumber("YOUR_TWILIO_NUMBER"),
            "Look ma I'm type inferred!").create(client)

    println(message.getSid())
}