Exceptions : java.lang.RuntimeException: Unable to get provider mono.MonoRuntimeProvider_1

[jonathanantoine]

Steps to Reproduce

1. Create a Xamarin Android app
2. Enable R8 and D8.
3. Uses the default proguard cfg
4. Run it on a device

Specifics (?) of my app : Android job service, FileProvider, BroadcastReceiver.

There is one MonoRuntimeProvider_1 java class generated in my obj folder.

The default proguard config is this one (found in the obj folder) :

# This is Xamarin-specific (and enhanced) configuration.

-dontobfuscate

-keep class android.support.multidex.MultiDexApplication { <init>(); }
-keep class mono.MonoRuntimeProvider { *; <init>(...); }
-keep class mono.MonoPackageManager { *; <init>(...); }
-keep class mono.MonoPackageManager_Resources { *; <init>(...); }
-keep class mono.android.** { *; <init>(...); }
-keep class mono.java.** { *; <init>(...); }
-keep class mono.javax.** { *; <init>(...); }
-keep class opentk.platform.android.AndroidGameView { *; <init>(...); }
-keep class opentk.GameViewBase { *; <init>(...); }
-keep class opentk_1_0.platform.android.AndroidGameView { *; <init>(...); }
-keep class opentk_1_0.GameViewBase { *; <init>(...); }
-keep class com.xamarin.java_interop.ManagedPeer { *; <init>(...); }

-keep class android.runtime.** { <init>(...); }
-keep class assembly_mono_android.android.runtime.** { <init>(...); }
# hash for android.runtime and assembly_mono_android.android.runtime.
-keep class md52ce486a14f4bcd95899665e9d932190b.** { *; <init>(...); }
-keepclassmembers class md52ce486a14f4bcd95899665e9d932190b.** { *; <init>(...); }

# Android's template misses fluent setters...
-keepclassmembers class * extends android.view.View {
   *** set*(...);
}

# also misses those inflated custom layout stuff from xml...
-keepclassmembers class * extends android.view.View {
   <init>(android.content.Context,android.util.AttributeSet);
   <init>(android.content.Context,android.util.AttributeSet,int);
}

Expected Behavior

No crash.

Actual Behavior

A crash report like this :

java.lang.RuntimeException: Unable to get provider mono.MonoRuntimeProvider_1: java.lang.ClassNotFoundException: Didn't find class "mono.MonoRuntimeProvider_1" on path: DexPathList[[zip file "/data/app/myApp-61Sw26LCrQQYfOvCs2GsDw==/base.apk"],nativeLibraryDirectories=[/data/app/myapp-61Sw26LCrQQYfOvCs2GsDw==/lib/arm64, /data/app/myapp-61Sw26LCrQQYfOvCs2GsDw==/base.apk!/lib/arm64-v8a, /system/lib64, /system/product/lib64]]
at android.app.ActivityThread.installProvider(ActivityThread.java:7152)
at android.app.ActivityThread.installContentProviders(ActivityThread.java:6630)
at android.app.ActivityThread.handleBindApplication(ActivityThread.java:6525)
at android.app.ActivityThread.access$1400(ActivityThread.java:220)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1883)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:224)
at android.app.ActivityThread.main(ActivityThread.java:7520)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:539)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:950)
Caused by: java.lang.ClassNotFoundException: Didn't find class "mono.MonoRuntimeProvider_1" on path: DexPathList[[zip file "/data/app/myapp-61Sw26LCrQQYfOvCs2GsDw==/base.apk"],nativeLibraryDirectories=[/data/app/myapp-61Sw26LCrQQYfOvCs2GsDw==/lib/arm64, /data/app/myapp-61Sw26LCrQQYfOvCs2GsDw==/base.apk!/lib/arm64-v8a, /system/lib64, /system/product/lib64]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:230)
at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
at android.app.AppComponentFactory.instantiateProvider(AppComponentFactory.java:147)
at android.app.ActivityThread.installProvider(ActivityThread.java:7136)
... 10 more

Version Information

The app is built via App Center (Mono 6.4 and Android 10.0).

On my mac I have this tool :

=== Visual Studio Community 2019 for Mac ===

Version 8.4 (build 2657)
Installation UUID: 37cc8c40-d076-4974-8bf8-344f707f4364
GTK+ 2.24.23 (Raleigh theme)
Xamarin.Mac 5.16.1.25 (issue-7441-d16-3-vsmac / 881172e73)

Package version: 606000155

=== Mono Framework MDK ===

Runtime:
Mono 6.6.0.155 (2019-08/296a9afdb24) (64-bit)
Package version: 606000155

=== Roslyn (Language Service) ===

3.4.0-beta4-19562-05+ff930dec4565e2bc424ad3bf3e22ecb20542c87d

=== NuGet ===

Version: 5.3.0.6192

=== .NET Core SDK ===

SDK: /usr/local/share/dotnet/sdk/3.1.100/Sdks
SDK Versions:
3.1.100
3.0.101
3.0.100
2.2.401
2.2.300
2.2.106
2.2.104
2.2.101
2.1.505
2.1.302
2.1.301
2.1.4
MSBuild SDKs: /Library/Frameworks/Mono.framework/Versions/6.6.0/lib/mono/msbuild/Current/bin/Sdks

=== .NET Core Runtime ===

Runtime: /usr/local/share/dotnet/dotnet
Runtime Versions:
3.1.0
3.0.1
3.0.0
2.2.6
2.2.5
2.2.4
2.2.2
2.2.0
2.1.14
2.1.13
2.1.9
2.1.2
2.1.1
2.0.5

=== Xamarin.Profiler ===

Version: 1.6.12.26
Location: /Applications/Xamarin Profiler.app/Contents/MacOS/Xamarin Profiler

=== Updater ===

Version: 11

=== Xamarin.Android ===

Version: 10.1.1.0 (Visual Studio Community)
Commit: xamarin-android/d16-4/f2c9364
Android SDK: /Users/jonathanantoine/Library/Developer/Xamarin/android-sdk-macosx
Supported Android versions:
4.4 (API level 19)
8.1 (API level 27)

SDK Tools Version: 26.1.1
SDK Platform Tools Version: 29.0.5
SDK Build Tools Version: 29.0.2

Build Information:
Mono: bef1e63
Java.Interop: xamarin/java.interop/d16-4@c4e569f
ProGuard: xamarin/proguard@905836d
SQLite: xamarin/sqlite@46204c4
Xamarin.Android Tools: xamarin/xamarin-android-tools/master@9f4ed4b

=== Microsoft Mobile OpenJDK ===

Java SDK: /Users/jonathanantoine/Library/Developer/Xamarin/jdk/microsoft_dist_openjdk_1.8.0.25
1.8.0-25
Android Designer EPL code available here:
https://github.com/xamarin/AndroidDesigner.EPL

=== Android SDK Manager ===

Version: 16.4.0.9
Hash: 3f7256f
Branch: remotes/origin/d16-4
Build date: 2019-12-19 18:59:12 UTC

=== Android Device Manager ===

Version: 16.4.0.28
Hash: 68e9956
Branch: remotes/origin/d16-4
Build date: 2019-12-19 18:59:32 UTC

=== Xamarin Designer ===

Version: 16.4.0.468
Hash: 519082ea8
Branch: remotes/origin/d16-4
Build date: 2019-12-04 16:21:00 UTC

=== Apple Developer Tools ===

Xcode 11.3 (15712)
Build 11C29

=== Xamarin.Mac ===

Xamarin.Mac not installed. Can't find /Library/Frameworks/Xamarin.Mac.framework/Versions/Current/Version.

=== Xamarin.iOS ===

Version: 13.8.3.0 (Visual Studio Community)
Hash: 0d8fe219c
Branch: d16-4
Build date: 2019-12-04 13:06:41-0500

=== Xamarin Inspector ===

Version: 1.4.3
Hash: db27525
Branch: 1.4-release
Build date: Mon, 09 Jul 2018 21:20:18 GMT
Client compatibility: 1

=== Build Information ===

Release ID: 804002657
Git revision: 4c6723413e884e024466fc93ff10e938bca7f721
Build date: 2020-01-06 18:20:13+00
Build branch: release-8.4
Xamarin extensions: 0f572cad12fd3886cd8e21a8b93b86e29ceaf111

=== Operating System ===

Mac OS X 10.15.2
Darwin 19.2.0 Darwin Kernel Version 19.2.0
Sat Nov 9 03:47:04 PST 2019
root:xnu-6153.61.1~20/RELEASE_X86_64 x86_64

=== Enabled user installed extensions ===

Xamarin.Forms HotReload extension 1.4.0
Open With 0.2
MFractor 3.9.7

[jonathanpeppers]

@jonathanantoine I get a different missing class for a new project with VS 2019 16.4 (latest stable):

Caused by: java.lang.ClassNotFoundException: android.support.v7.widget.FitWindowsLinearLayout

I think this will be improved by: f82cd9d

Using the latest xamarin-android/master, I don't get t a crash at all.

What is weird about this, is the class you get an error for is normally named MonoRuntimeProvider:

https://github.com/xamarin/xamarin-android/blob/3c2489be0a8ea1f8db30c62b2cf8e4006f754dda/src/Xamarin.Android.Build.Tasks/Tasks/GenerateJavaStubs.cs#L263-L270

Can you share a diagnostic MSBuild log? Also your obj/Debug/android/AndroidManifest.xml file might give us a clue what's happening here. Thanks!

[jonathanantoine]

@jonathanpeppers I already keeped FitWindowsLinearLayout and that's why I did not get it in my log. On my another project I have MonoRuntimeProvider_1 and MonoRuntimeProvider_2 generated also !

How can I provide you the logs in a secure way ?

[jonathanpeppers]

@jonathanantoine you can email me privately at the email address listed on my Github profile, thanks!

[jonathanantoine]

@jonathanpeppers thanks, I just sent them !

[jonathanantoine]

Hello,

Any update :) ?

[jonathanantoine]

I manage to build a repro project, it happens as soon as I use the Process = ":remote" parameter on a BroadCastReceiver : blanctest.zip.

[BroadcastReceiver(Process = ":remote", Name = "com.jonathanantoine.deded.DisplayToastBroadcastReceiver")]
public class DisplayToastBroadcastReceiver : BroadcastReceiver
{
    public override void OnReceive(Context context, Intent intent)
    {
        var notificationManager = (NotificationManager)context
        .GetSystemService(Context.NotificationService);
    }
}

[jonathanpeppers]

Hi @jonathanantoine I added this proguard rule, and it seems to solve the issue:

-keep class mono.MonoRuntimeProvider* { *; <init>(...); }

Does that work for you?

The default one needs to change to this:

--keep class mono.MonoRuntimeProvider { *; <init>(...); }
+-keep class mono.MonoRuntimeProvider* { *; <init>(...); }

I just need to write a test and can send in a fix for this.