how to update Application.Java for firebase messaging version 8

[DeanPack]

I've upgraded all my firebase packages today, and I had to upgrade to version 8 for firebase messaging even though it is still in dev due to dependency issues. In Application.Java, I have:
`package com.halloglobal.flutterapp.hallo;

import io.flutter.app.FlutterApplication;
import io.flutter.plugin.common.PluginRegistry;
import io.flutter.plugin.common.PluginRegistry.PluginRegistrantCallback;
import io.flutter.plugins.GeneratedPluginRegistrant;
import io.flutter.plugins.firebasemessaging.FlutterFirebaseMessagingService;
import io.flutter.plugins.firebasemessaging.FirebaseMessagingPlugin;
import io.flutter.view.FlutterMain;

public class Application extends FlutterApplication implements PluginRegistrantCallback {
@OverRide
public void onCreate() {
super.onCreate();
FlutterFirebaseMessagingService.setPluginRegistrant(this);
}
@OverRide
public void registerWith(PluginRegistry registry) {
FirebaseMessagingPlugin.registerWith(registry.registrarFor("io.flutter.plugins.firebasemessaging.FirebaseMessagingPlugin"));
}
}`

Which has worked fine in the past, but now with this new version, I get this error:
Note: Recompile with -Xlint:deprecation for details.
/Users/hallo/Documents/HalloMonoRepo/hallo/android/app/src/main/java/com/halloglobal/flutterapp/hallo/Application.java:7: error: package io.flutter.plugins.firebasemessaging does not exist
import io.flutter.plugins.firebasemessaging.FlutterFirebaseMessagingService;
^
/Users/hallo/Documents/HalloMonoRepo/hallo/android/app/src/main/java/com/halloglobal/flutterapp/hallo/Application.java:8: error: package io.flutter.plugins.firebasemessaging does not exist
import io.flutter.plugins.firebasemessaging.FirebaseMessagingPlugin;

How do I need to change my Application.java to work with the new version?