🐛 [firebase_messaging] java.lang.NullPointerException: Attempt to invoke interface method

[saravananmnm]

java.lang.NullPointerException: Attempt to invoke interface method 'void io.flutter.plugin.common.BinaryMessenger.setMessageHandler(java.lang.String, io.flutter.plugin.common.BinaryMessenger$BinaryMessageHandler)' on a null object reference
E/AndroidRuntime(19251): 	at io.flutter.plugin.common.MethodChannel.setMethodCallHandler(MethodChannel.java:116)
E/AndroidRuntime(19251): 	at io.flutter.plugins.firebasemessaging.FirebaseMessagingPlugin.onAttachedToEngine(FirebaseMessagingPlugin.java:60)
E/AndroidRuntime(19251): 	at io.flutter.plugins.firebasemessaging.FirebaseMessagingPlugin.registerWith(FirebaseMessagingPlugin.java:51)
E/AndroidRuntime(19251): 	at com.courier_alliance.driver.Application.registerWith(Application.java:22)
E/AndroidRuntime(19251): 	at com.transistorsoft.flutter.backgroundfetch.HeadlessTask.startBackgroundIsolate(HeadlessTask.java:150)
E/AndroidRuntime(19251): 	at com.transistorsoft.flutter.backgroundfetch.HeadlessTask.dispatch(HeadlessTask.java:101)
E/AndroidRuntime(19251): 	at com.transistorsoft.flutter.backgroundfetch.HeadlessTask.run(HeadlessTask.java:95)
E/AndroidRuntime(19251): 	at android.os.Handler.handleCallback(Handler.java:883)
E/AndroidRuntime(19251): 	at android.os.Handler.dispatchMessage(Handler.java:100)
E/AndroidRuntime(19251): 	at android.os.Looper.loop(Looper.java:214)
E/AndroidRuntime(19251): 	at android.app.ActivityThread.main(ActivityThread.java:7356)
E/AndroidRuntime(19251): 	at java.lang.reflect.Method.invoke(Native Method)
E/AndroidRuntime(19251): 	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
E/AndroidRuntime(19251): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)



Token retrieval failed: SERVICE_NOT_AVAILABLE. Will retry token retrieval
E/FirebaseInstanceId(19376): Failed to get FIS auth token
W/FirebaseMessagingPlugin(19376): getToken, error fetching instanceID: 
W/FirebaseMessagingPlugin(19376): java.io.IOException: SERVICE_NOT_AVAILABLE
W/FirebaseMessagingPlugin(19376): 	at com.google.firebase.iid.zzu.then(com.google.firebase:firebase-iid@@20.2.0:16)
W/FirebaseMessagingPlugin(19376): 	at com.google.android.gms.tasks.zzd.run(Unknown Source:5)
W/FirebaseMessagingPlugin(19376): 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
W/FirebaseMessagingPlugin(19376): 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
W/FirebaseMessagingPlugin(19376): 	at com.google.android.gms.common.util.concurrent.zza.run(Unknown Source:6)
W/FirebaseMessagingPlugin(19376): 	at java.lang.Thread.run(Thread.java:919)
I/flutter (19376): FCM : empty

[TahaTesser]

Hi @saravananmnm
Can you please provide your flutter doctor -v your flutter run --verbose, your pubspec.yaml and a complete reproducible minimal code sample
Thank you

[google-oss-bot]

Hey @saravananmnm. We need more information to resolve this issue but there hasn't been an update in 7 weekdays. I'm marking the issue as stale and if there are no new updates in the next 7 days I will close it automatically.

If you have more information that will help us get to the bottom of this, just add a comment!

[google-oss-bot]

Since there haven't been any recent updates here, I am going to close this issue.

@saravananmnm if you're still experiencing this problem and want to continue the discussion just leave a comment here and we are happy to re-open this.

[saravananmnm]

2020-10-29 11:38:47.669 6459-6459/com.courieralliance.driverca.qa W/FlutterEnginePluginRegistry: Attempted to register plugin (io.flutter.embedding.engine.plugins.shim.ShimPluginRegistry$ShimRegistrarAggregate@b3b4285) but it was already registered with this FlutterEngine (io.flutter.embedding.engine.FlutterEngine@e5e08da).
2020-10-29 11:38:47.672 6459-6459/com.courieralliance.driverca.qa E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.courieralliance.driverca.qa, PID: 6459
java.lang.NullPointerException: Attempt to invoke interface method 'void io.flutter.plugin.common.BinaryMessenger.setMessageHandler(java.lang.String, io.flutter.plugin.common.BinaryMessenger$BinaryMessageHandler)' on a null object reference
at io.flutter.plugin.common.MethodChannel.setMethodCallHandler(MethodChannel.java:116)
at io.flutter.plugins.firebasemessaging.FirebaseMessagingPlugin.onAttachedToEngine(FirebaseMessagingPlugin.java:60)
at io.flutter.plugins.firebasemessaging.FirebaseMessagingPlugin.registerWith(FirebaseMessagingPlugin.java:51)
at com.courieralliance.driverca.Application.registerWith(Application.java:29)
at com.transistorsoft.flutter.backgroundfetch.HeadlessTask.startBackgroundIsolate(HeadlessTask.java:150)
at com.transistorsoft.flutter.backgroundfetch.HeadlessTask.dispatch(HeadlessTask.java:101)
at com.transistorsoft.flutter.backgroundfetch.HeadlessTask.run(HeadlessTask.java:95)
at android.os.Handler.handleCallback(Handler.java:883)
at android.os.Handler.dispatchMessage(Handler.java:100)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7356)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)

--------- beginning of system

[saravananmnm]

C:\Saravanan\Flutter_Sdk\flutter\bin\flutter.bat doctor --verbose
[√] Flutter (Channel stable, 1.20.4, on Microsoft Windows [Version 10.0.18362.1082], locale en-IN)
• Flutter version 1.20.4 at C:\Saravanan\Flutter_Sdk\flutter
• Framework revision fba99f6cf9 (6 weeks ago), 2020-09-14 15:32:52 -0700
• Engine revision d1bc06f032
• Dart version 2.9.2

[√] Android toolchain - develop for Android devices (Android SDK version 30.0.0)
• Android SDK at C:\Users\Admin\AppData\Local\Android\sdk
• Platform android-30, build-tools 30.0.0
• Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java
• Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b01)
• All Android licenses accepted.

[√] Android Studio (version 4.0)
• Android Studio at C:\Program Files\Android\Android Studio
• Flutter plugin version 50.0.1
• Dart plugin version 193.7547
• Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b01)

[√] Connected device (1 available)
• Android SDK built for x86 (mobile) • emulator-5554 • android-x86 • Android 10 (API 29) (emulator)

• No issues found!
Process finished with exit code 0

[saravananmnm]

When i kill the application this issue occured still now.

`

//import com.transistorsoft.flutter.backgroundfetch.BackgroundFetchPlugin;
import io.flutter.app.FlutterApplication;
import io.flutter.plugin.common.PluginRegistry;
import io.flutter.plugins.firebasemessaging.FlutterFirebaseMessagingService;
import io.flutter.plugins.firebasemessaging.FirebaseMessagingPlugin;
import io.flutter.plugins.sharedpreferences.SharedPreferencesPlugin;
import com.dexterous.flutterlocalnotifications.FlutterLocalNotificationsPlugin;
import io.flutter.plugins.pathprovider.PathProviderPlugin;
import rekab.app.background_locator.LocatorService;
import com.whelksoft.flutter_native_timezone.FlutterNativeTimezonePlugin;
import com.transistorsoft.flutter.backgroundfetch.BackgroundFetchPlugin;

public class Application extends FlutterApplication implements PluginRegistry.PluginRegistrantCallback {

@Override
public void onCreate() {
    super.onCreate();
    FlutterFirebaseMessagingService.setPluginRegistrant(this);
    BackgroundFetchPlugin.setPluginRegistrant(this);
    LocatorService.setPluginRegistrant(this);
}

@Override
public void registerWith(PluginRegistry registry) {
    // I've only had to add this line to make it work
    if (!registry.hasPlugin("io.flutter.plugins.firebasemessaging.FirebaseMessagingPlugin")) {
        FirebaseMessagingPlugin.registerWith(registry.registrarFor("io.flutter.plugins.firebasemessaging.FirebaseMessagingPlugin"));
    }
    if (!registry.hasPlugin("com.dexterous.flutterlocalnotifications.FlutterLocalNotificationsPlugin")) {
        FlutterLocalNotificationsPlugin.registerWith(registry.registrarFor("com.dexterous.flutterlocalnotifications.FlutterLocalNotificationsPlugin"));
    }
    if (!registry.hasPlugin("com.transistorsoft.flutter.backgroundfetch.BackgroundFetchPlugin")) {
        BackgroundFetchPlugin.registerWith(registry.registrarFor("com.transistorsoft.flutter.backgroundfetch.BackgroundFetchPlugin"));
    }

    if (!registry.hasPlugin("io.flutter.plugins.pathprovider")) {
        PathProviderPlugin.registerWith(registry.registrarFor("io.flutter.plugins.pathprovider"));
    }
    if (!registry.hasPlugin("io.flutter.plugins.sharedpreferences")) {
        SharedPreferencesPlugin.registerWith(registry.registrarFor("io.flutter.plugins.sharedpreferences"));
    }
    if (!registry.hasPlugin("com.whelksoft.flutter_native_timezone")) {
        FlutterNativeTimezonePlugin.registerWith(registry.registrarFor("com.whelksoft.flutter_native_timezone"));
    }

}

}
`