Fatal Exception: Firebase-Messaging-Intent-Handle -- Java.Lang.Noclassdeffounderror

FATAL EXCEPTION: Firebase-Messaging-Intent-Handle -- java.lang.NoClassDefFoundError

Solution: ignore

All signs point to this being a problem with Google Play's Pre-launch Reports and not our code.

Edit:
Google's product and engineering teams are now aware of the issue. But it seems they might need a few more people to give them a sense of the scale of the issue. Perhaps consider posting on the bug report.

Update:
Google have fixed it now by adding a filter for the process. See comment 256 on the bug report.

I have uploaded a few versions of my app and the problem is now gone.

FATAL EXCEPTION: Firebase-Messaging-Intent-Handle Process: com.google.android.youtube on pre launch google play console

It seems to be a problem on google devices, the solution is to wait for them to fix it. For more information see the following question:

Link

Java.Lang.NoClassDefFoundError when implementing firebase cloud messaging

Installing the Xamarin.Google.Dagger package solved this problem for me.

Firebase Messaging Error(Android only) - Fatal Exception on new Push Notification

the error message hints for iid; the instance ID service. this might be provided by firebase-core; while it could also be incompatible versions, which occassionaly lead to unknown methods and fields.

try to update:

classpath 'com.android.tools.build:gradle:3.0.1'
classpath 'com.google.gms:google-services:3.2.1'

to the current versions:

classpath 'com.android.tools.build:gradle:3.2.0'
classpath 'com.google.gms:google-services:4.1.0'

the firebase-perf plugin has to be at the top, not the bottom:

apply plugin: 'com.android.application'
apply plugin: 'com.google.firebase.firebase-perf'

also the library is outdated (possibly might require firebase-core):

implementation 'com.google.firebase:firebase-core:16.0.4'
implementation 'com.google.firebase:firebase-perf:16.1.2'

while I really wonder, why there is no dependency for FCM (as one would expect it):

implementation 'com.google.firebase:firebase-messaging:17.3.3'

once targeting API level 28, it is also suggested to setup a notification channel:

<meta-data
    android:name="com.google.firebase.messaging.default_notification_channel_id"
    android:value="@string/default_notification_channel_id" />

... the support libraries would be at version 28.0.0 currently.

remark: the invalid JSON syntax might (most likely) come from posting it wrongfully - otherwise other platforms would not function either; I've just added an explanation what is wrong with it and removed the hard-coded values. the stack-trace tells a whole other story, not hinting for any invalid syntax.

Cannot handle exception in firebase function

The exception which is thrown in OnCompleteListener will not propagate to the outer scope, it is scoped to OnCompleteListener block. To achieve your objective I would recommend to rewrite the code to something like the following:

coroutineScope.launch {
    try {
        val token: String = FirebaseMessaging.getInstance().token.await()
        if (token.isNotEmpty) {
            getUsers().await()
        }
    } catch (e: Exception){
        // ...
    }
}

await function waits for task to complete.

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