SmsDemo.java

package com.twilio.demo;

import com.twilio.http.TwilioRestClient;
import com.twilio.rest.api.v2010.account.Message;
import com.twilio.type.PhoneNumber;

public class SmsDemo {

    public static void main(String[] args) {

//  Don't do this:
//        Twilio.init(
//            System.getenv("ACCOUNT_SID"),
//            System.getenv("AUTH_TOKEN"));

        // Do this instead
        TwilioRestClient client = new TwilioRestClient.Builder(
            System.getenv("ACCOUNT_SID"),
            System.getenv("AUTH_TOKEN")).build();

        Message msg = Message.creator(
            new PhoneNumber("+447723012710"),
            new PhoneNumber("+44 7576 277909"),
            "Hello from Twilio"
        ).create(client);  // <-- pass the client in here

        System.out.println(msg.getSid());

    }
}