[Bug]: ClassNotFoundException: java.util.function.Consumer

[sntahmaz]

What happened?

OneSignal causes class not found exception on Android 6 and earlier versions.
crash_session_stacktrace.txt

Steps to reproduce?

I couldn't reproduce but I have Crashlytics logs.

What did you expect to happen?

I expect OneSignal to work without exception on Android devices with API levels between 19 and 23.

Unity version

2021.3.43

OneSignal Unity SDK version

5.1.6

Platform

Android

Relevant log output

Fatal Exception: java.lang.Exception: AndroidJavaException : java.lang.ClassNotFoundException: java.util.function.Consumer
       at java.lang.Class.classForName(java.lang.Class)
       at java.lang.Class.forName(java.lang.Class)
       at com.unity3d.player.UnityPlayer.nativeRender(com.unity3d.player.UnityPlayer)
       at com.unity3d.player.UnityPlayer.access$300(com.unity3d.player.UnityPlayer)
       at com.unity3d.player.UnityPlayer$e$1.handleMessage(com.unity3d.player.UnityPlayer$e$1)
       at android.os.Handler.dispatchMessage(android.os.Handler)
       at android.os.Looper.loop(android.os.Looper)
       at com.unity3d.player.UnityPlayer$e.run(com.unity3d.player.UnityPlayer$e)
       at dalvik.system.BaseDexClassLoader.findClass(dalvik.system.BaseDexClassLoader)
       at java.lang.ClassLoader.loadClass(java.lang.ClassLoader)
       at java.lang.ClassLoader.loadClass(java.lang.ClassLoader)
       at java.lang.Class.classForName(java.lang.Class)
       at java.lang.BootClassLoader.findClass(java.lang.BootClassLoader)
       at java.lang.BootClassLoader.loadClass(java.lang.BootClassLoader)
       at java.lang.ClassLoader.loadClass(java.lang.ClassLoader)
       at UnityEngine.AndroidJNISafe.CheckException(UnityEngine.AndroidJNISafe)
       at UnityEngine.AndroidJNISafe.FindClass(UnityEngine.AndroidJNISafe)
       at UnityEngine.AndroidJavaClass._AndroidJavaClass(UnityEngine.AndroidJavaClass)
       at UnityEngine.AndroidJavaProxy..ctor(UnityEngine.AndroidJavaProxy.)
       at OneSignalSDK.Android.Utilities.BoolContinuation..ctor(OneSignalSDK.Android.Utilities.BoolContinuation.)
       at OneSignalSDK.Android.Notifications.AndroidNotificationsManager+<RequestPermissionAsync>d__17.MoveNext(OneSignalSDK.Android.Notifications.AndroidNotificationsManager+<RequestPermissionAsync>d__17)
       at System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1[TResult].Start[TStateMachine](System.Runtime.CompilerServices.AsyncTaskMethodBuilder`1[TResult])
       at OneSignalSDK.Android.Notifications.AndroidNotificationsManager.RequestPermissionAsync(OneSignalSDK.Android.Notifications.AndroidNotificationsManager)
       at PushNotificationManager+<PromtForNotificationIfRequired>d__11.MoveNext(PushNotificationManager+<PromtForNotificationIfRequired>d__11)
       at System.Runtime.CompilerServices.AsyncVoidMethodBuilder.Start[TStateMachine](System.Runtime.CompilerServices.AsyncVoidMethodBuilder)
       at PushNotificationManager.PromtForNotificationIfRequired(PushNotificationManager)
       at SceneControllers.MainSceneController.Start(SceneControllers.MainSceneController)

Code of Conduct

• I agree to follow this project's Code of Conduct

[shepherd-l]

Apologies for the delayed response

Our Android SDK only supports Android 5+ and unfortunately, there is no straightforward workaround to support the java.util.function.Consumer class in Unity for Android 5 and Android 6. We will be updating our docs to bump the minimum Android version for the OneSignal Unity SDK from Android 5 to Android 7.

Closing this issue for now. If you would like to discuss further, feel free to respond here

[shepherd-l]

A workaround you can do for your app is to follow Android's guide for adding Java 8+ API desugaring support (Android Gradle Plugin 4.0.0+)