A null reference exception occurs when setting the target api level to API 29 in Unity.

[zippo227]

Settings

Unity editor version: Unity 2019.2.13 through Unity 2019.3.7 are the ones I tested
External Dependency Manager version: v0.10.07
Features in External Dependency Manager in use (Android Resolver, iOS Resolver, VersionHandler, etc.): UnityCompat Android Resolver
Plugins SDK in use (Firebase, Admob, Facebook, etc.): play-games-plugin-for-unity
Platform you are using the Unity editor on (Mac, Windows, or Linux): Mac
Platform you are targeting (iOS, Android, and/or desktop): Android
Scripting Runtime (Mono, and/or IL2CPP): .Net Standard 2.0, IL2CPP

Issue

When changing the target api level from automatic (which uses api 28) to API 29, the resolver throws an exception. I believe this has to do with some missing code in Unity, but it could be fixed with this plugin by using some better error handling and fewer assumptions in the VersionFromAndroidSDKVersionsEnum in UnityCompat.cs . I would like to attempt to fix it, but I'm not directly importing this plugin, I'm using the play-games-plugin-for-unity which had a similar bug filed but closed due to it being an issue elsewhere. playgameservices/play-games-plugin-for-unity#2790

Here is the error log:

NullReferenceException: Object reference not set to an instance of an object
GooglePlayServices.UnityCompat.VersionFromAndroidSDKVersionsEnum (System.String enumName, System.String fallbackPrefKey, System.Int32 fallbackValue) (at /Users/smiles/dev/src/unity-jar-resolver/source/PlayServicesResolver/src/UnityCompat.cs:58)
GooglePlayServices.UnityCompat.GetAndroidTargetSDKVersion () (at /Users/smiles/dev/src/unity-jar-resolver/source/PlayServicesResolver/src/UnityCompat.cs:116)
GooglePlayServices.PlayServicesResolver.CanEnableJetifierOrPromptUser (System.String titlePrefix) (at /Users/smiles/dev/src/unity-jar-resolver/source/PlayServicesResolver/src/PlayServicesResolver.cs:2314)
GooglePlayServices.PlayServicesResolver.ResolveUnsafe (System.Action1[T] resolutionComplete, System.Boolean forceResolution, System.Boolean isAutoResolveJob, System.Boolean closeWindowOnCompletion) (at /Users/smiles/dev/src/unity-jar-resolver/source/PlayServicesResolver/src/PlayServicesResolver.cs:1635) GooglePlayServices.PlayServicesResolver+<ScheduleResolve>c__AnonStorey1E.<>m__3F () (at /Users/smiles/dev/src/unity-jar-resolver/source/PlayServicesResolver/src/PlayServicesResolver.cs:1604) GooglePlayServices.PlayServicesResolver.ExecuteNextResolveJob () (at /Users/smiles/dev/src/unity-jar-resolver/source/PlayServicesResolver/src/PlayServicesResolver.cs:1461) GooglePlayServices.PlayServicesResolver.ScheduleResolve (System.Boolean forceResolution, System.Boolean closeWindowOnCompletion, System.Action1[T] resolutionCompleteWithResult, System.Boolean isAutoResolveJob) (at /Users/smiles/dev/src/unity-jar-resolver/source/PlayServicesResolver/src/PlayServicesResolver.cs:1617)
GooglePlayServices.PlayServicesResolver.ResolveSync (System.Boolean forceResolution, System.Boolean closeWindowOnCompletion) (at /Users/smiles/dev/src/unity-jar-resolver/source/PlayServicesResolver/src/PlayServicesResolver.cs:1514)
GooglePlayServices.PlayServicesResolver.OnPostProcessScene () (at /Users/smiles/dev/src/unity-jar-resolver/source/PlayServicesResolver/src/PlayServicesResolver.cs:1087)
System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at <567df3e0919241ba98db88bec4c6696f>:0)
Rethrow as TargetInvocationException: Exception has been thrown by the target of an invocation.
System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at <567df3e0919241ba98db88bec4c6696f>:0)
System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) (at <567df3e0919241ba98db88bec4c6696f>:0)
UnityEditor.Build.BuildPipelineInterfaces+AttributeCallbackWrapper.OnProcessScene (UnityEngine.SceneManagement.Scene scene, UnityEditor.Build.Reporting.BuildReport report) (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/BuildPipelineInterfaces.cs:163)
UnityEditor.Build.BuildPipelineInterfaces+c__AnonStorey1.<>m__1 (UnityEditor.Build.IProcessSceneWithReport spp) (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/BuildPipelineInterfaces.cs:387)
UnityEditor.Build.BuildPipelineInterfaces.InvokeCallbackInterfacesPair[T1,T2] (System.Collections.Generic.List1[T] oneInterfaces, System.Action1[T] invocationOne, System.Collections.Generic.List1[T] twoInterfaces, System.Action1[T] invocationTwo, System.Boolean exitOnFailure) (at /Users/builduser/buildslave/unity/build/Editor/Mono/BuildPipeline/BuildPipelineInterfaces.cs:356)
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr) (at /Users/builduser/buildslave/unity/build/Modules/IMGUI/GUIUtility.cs:179)

Repro Rate

What's the issue repro rate? (eg 100%, 1/5 etc)
100%

Temporary Workaround

From what I see in the codebase this function is not hit if jetifier is disabled, so I've disabled jetifier for now.

[stewartmiles]

@zippo227 are you sure that you're using the latest version? This problem was worked around in 1.2.138

[zippo227]

I'm using the latest version of the https://github.com/playgameservices/play-games-plugin-for-unity which brings the unity-jar-resolver along. I don't see where they specify which version they bring along. If it's an issue on that plugin that it needs to bring along a newer version of this, could you @stewartmiles request the person who closed the issue I referenced reopen it?

[stewartmiles]

If you goto Assets > External Dependency Manager > Android Resolver > Settings the version is displayed at the top of the window.

[zippo227]

Oh you're right! Though for me I had to go to Assets -> Play Services Resolver -> Version Handler -> Settings. It looks like it's using 1.2.135 which doesn't match the latest version I see here 1.2.143.

[zippo227]

I don't really get the difference between the two packages, but I have now uninstalled the PlayServicesResolver I had and installed the ExternalDependencyManager from this latest release. It added a source to my pacakage manager, so I uninstalled the version I downloaded from release here and installed the latest version from package manager. At this point I'm just crossing my fingers and hoping I can reenable jetifier as I need it on Windows.

[zippo227]

Update. It worked great! Seems like that other plugin should stop bringing the jar resolver along with it.

[stewartmiles]

@zippo227 it's fine to include EDM4U in another other plugin, it just needs to be up to date to pick up the latest fixes. I think the GPGS team is working on this at the moment anyway.