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[.NET 6] Debug build of Java.Interop.dll crashes Xamarin.Forms applications #5409

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jonathanpeppers opened this issue Dec 14, 2020 · 0 comments · Fixed by #5459
Closed

[.NET 6] Debug build of Java.Interop.dll crashes Xamarin.Forms applications #5409

jonathanpeppers opened this issue Dec 14, 2020 · 0 comments · Fixed by #5459
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@grendello
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Area: App+Library Build Issues when building Library projects or Application projects. Area: App Runtime Issues in `libmonodroid.so`. bug Component does not function as intended.
Milestone
In Preview: 11.3 ...

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@jonathanpeppers
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Steps to Reproduce

  1. Build a Debug build of xamarin-android locally with msbuild Xamarin.Android.sln -t:PackDotNet or make pack-dotnet

  2. Build this Xamarin.Forms sample:

    ~\android-toolchain\dotnet\dotnet build .\HelloForms\HelloForms.csproj -t:Run -p:TargetFramework=net6.0-android

You may need to add an entry to NuGet.config, full path to:

<configuration>
  <packageSources>
    <add key="local" value="C:\src\xamarin-android\bin\BuildDebug\nupkgs" />
...
  1. The app crashes on startup.

Crashes with:

12-14 08:50:08.286 11868 11868 D app_process32: ---- DEBUG ASSERTION FAILED ----
12-14 08:50:08.286 11868 11868 D app_process32: ---- Assert Short Message ----
12-14 08:50:08.286 11868 11868 D app_process32: ManagedPeerType <=> JniTypeName Mismatch! javaVM.GetJniTypeInfoForType(typeof(Android.Views.LayoutInflaterInvoker)).JniTypeName="" != "android/view/LayoutInflater"
12-14 08:50:08.286 11868 11868 D app_process32: ---- Assert Long Message ----
12-14 08:50:08.286 11868 11868 D app_process32:
12-14 08:50:08.286 11868 11868 D app_process32:    at System.Diagnostics.DebugProvider.Fail(String message, String detailMessage)
12-14 08:50:08.286 11868 11868 D app_process32:    at System.Diagnostics.Debug.Fail(String message, String detailMessage)
12-14 08:50:08.286 11868 11868 D app_process32:    at System.Diagnostics.Debug.Assert(Boolean condition, String message, String detailMessage)
12-14 08:50:08.286 11868 11868 D app_process32:    at System.Diagnostics.Debug.Assert(Boolean condition, String message)
12-14 08:50:08.286 11868 11868 D app_process32:    at Java.Interop.JniPeerMembers..ctor(String jniPeerTypeName, Type managedPeerType, Boolean checkManagedPeerType, Boolean isInterface)
12-14 08:50:08.286 11868 11868 D app_process32:    at Java.Interop.JniPeerMembers..ctor(String jniPeerTypeName, Type managedPeerType)
12-14 08:50:08.286 11868 11868 D app_process32:    at Android.Runtime.XAPeerMembers..ctor(String jniPeerTypeName, Type managedPeerType)
12-14 08:50:08.286 11868 11868 D app_process32:    at Android.Views.LayoutInflaterInvoker..cctor()
12-14 08:50:08.286 11868 11868 D app_process32:    at System.Reflection.RuntimeConstructorInfo.InternalInvoke(RuntimeConstruct
12-14 08:50:08.290 11868 11868 W         : CLR: Managed code called FailFast, saying "ManagedPeerType <=> JniTypeName Mismatch! javaVM.GetJniTypeInfoForType(typeof(Android.Views.LayoutInflaterInvoker)).JniTypeName="" != "android/view/LayoutInflater"
12-14 08:50:08.290 11868 11868 W         :    at System.Diagnostics.DebugProvider.Fail(String message, String detailMessage)
12-14 08:50:08.290 11868 11868 W         :    at System.Diagnostics.Debug.Fail(String message, String detailMessage)
12-14 08:50:08.290 11868 11868 W         :    at System.Diagnostics.Debug.Assert(Boolean condition, String message, String detailMessage)
12-14 08:50:08.290 11868 11868 W         :    at System.Diagnostics.Debug.Assert(Boolean condition, String message)
12-14 08:50:08.290 11868 11868 W         :    at Java.Interop.JniPeerMembers..ctor(String jniPeerTypeName, Type managedPeerType, Boolean checkManagedPeerType, Boolean isInterface)
12-14 08:50:08.290 11868 11868 W         :    at Java.Interop.JniPeerMembers..ctor(String jniPeerTypeName, Type managedPeerType)
12-14 08:50:08.290 11868 11868 W         :    at Android.Runtime.XAPeerMembers..ctor(String jniPeerTypeName, Type managedPeerType)
12-14 08:50:08.290 11868 11868 W         :    at Android.Views.LayoutInflaterInvoker..cctor()
12-14 08:50:08.290 11868 11868 W         :    at System.Reflection.RuntimeConstructorInfo.InternalInvoke(RuntimeConstructorInfo , Object , Object[] , Exception& )
12-14 08:50:08.290 11868 11868 W         :    at System.Reflection.RuntimeConstructorInfo.InternalInvoke(Object obj, Object[] parameters, Boolean wrapExceptions)
12-14 08:50:08.290 11868 11868 W         :    at System.Reflection.RuntimeConstructorInfo.DoInvoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
12-14 08:50:08.290 11868 11868 W         :    at System.Reflection.RuntimeConstructorInfo.Invoke(BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
12-14 08:50:08.290 11868 11868 W         :    at System.Reflection.ConstructorInfo.Invoke(Object[] parameters)
12-14 08:50:08.290 11868 11868 W         :    at Java.Interop.TypeManager.CreateProxy(Type type, IntPtr handle, JniHandleOwnership transfer)
12-14 08:50:08.290 11868 11868 W         :    at Java.Interop.TypeManager.CreateInstance(IntPtr handle, JniHandleOwnership transfer, Type targetType)
12-14 08:50:08.290 11868 11868 W         :    at Java.Lang.Object.GetObject(IntPtr handle, JniHandleOwnership transfer, Type type)
12-14 08:50:08.290 11868 11868 W         :    at Java.Lang.Object._GetObject[LayoutInflater](IntPtr handle, JniHandleOwnership transfer)
12-14 08:50:08.290 11868 11868 W         :    at Java.Lang.Object.GetObject[LayoutInflater](IntPtr handle, JniHandleOwnership transfer)
12-14 08:50:08.290 11868 11868 W         :    at Android.App.Activity.get_LayoutInflater()
12-14 08:50:08.290 11868 11868 W         :    at Xamarin.Forms.Platform.Android.FormsAppCompatActivity.OnCreate(Bundle savedInstanceState, ActivationFlags flags)
12-14 08:50:08.290 11868 11868 W         :    at Xamarin.Forms.Platform.Android.FormsAppCompatActivity.OnCreate(Bundle savedInstanceState)
12-14 08:50:08.290 11868 11868 W         :    at HelloForms.Droid.MainActivity.OnCreate(Bundle savedInstanceState)
12-14 08:50:08.290 11868 11868 W         :    at Android.App.Activity.n_OnCreate_Landroid_os_Bundle_(IntPtr jnienv, IntPtr native__this, IntPtr native_savedInstanceState)
12-14 08:50:08.290 11868 11868 W         :    at Android.Runtime.DynamicMethodNameCounter.5(IntPtr , IntPtr , IntPtr )"
12-14 08:50:08.292 11868 11868 E mono    :
12-14 08:50:08.292 11868 11868 E mono    : Unhandled Exception:
12-14 08:50:08.292 11868 11868 E mono    : System.Diagnostics.DebugProvider+DebugAssertException: ManagedPeerType <=> JniTypeName Mismatch! javaVM.GetJniTypeInfoForType(typeof(Android.Views.LayoutInflaterInvoker)).JniTypeName="" != "android/view/LayoutInflater"
12-14 08:50:08.292 11868 11868 E mono    :    at System.Diagnostics.DebugProvider.Fail(String message, String detailMessage)
12-14 08:50:08.292 11868 11868 E mono    :    at System.Diagnostics.Debug.Fail(String message, String detailMessage)
12-14 08:50:08.292 11868 11868 E mono    :    at System.Diagnostics.Debug.Assert(Boolean condition, String message, String detailMessage)
12-14 08:50:08.292 11868 11868 E mono    :    at System.Diagnostics.Debug.Assert(Boolean condition, String message)
12-14 08:50:08.292 11868 11868 E mono    :    at Java.Interop.JniPeerMembers..ctor(String jniPeerTypeName, Type managedPeerType, Boolean checkManagedPeerType, Boolean isInterface)
12-14 08:50:08.292 11868 11868 E mono    :    at Java.Interop.JniPeerMembers..ctor(String jniPeerTypeName, Type managedPeerType)
12-14 08:50:08.292 11868 11868 E mono    :    at Android.Runtime.XAPeerMembers..ctor(String jniPeerTypeName, Type managedPeerType)
12-14 08:50:08.292 11868 11868 E mono    :    at Android.Views.LayoutInflaterInvoker..cctor()
12-14 08:50:08.292 11868 11868 E mono    :    at System.Reflection.RuntimeConstructorInfo.InternalInvoke(RuntimeConstructorInfo , Object , Object[] , Exception& )
12-14 08:50:08.292 11868 11868 E mono    :    at System.Reflection.RuntimeConstructorInfo.InternalInvoke(Object obj, Object[] parameters, Boolean wrapExceptions)
12-14 08:50:08.292 11868 11868 E mono    :    at System.Reflection.RuntimeConstructorInfo.DoInvoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
12-14 08:50:08.292 11868 11868 E mono    :    at System.Reflection.RuntimeConstructorInfo.Invoke(BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
12-14 08:50:08.292 11868 11868 E mono    :    at System.Reflection.ConstructorInfo.Invoke(Object[] parameters)
12-14 08:50:08.292 11868 11868 E mono    :    at Java.Interop.TypeManager.CreateProxy(Type type, IntPtr handle, JniHandleOwnership transfer)
12-14 08:50:08.292 11868 11868 E mono    :    at Java.Interop.TypeManager.CreateInstance(IntPtr handle, JniHandleOwnership transfer, Type targetType)
12-14 08:50:08.292 11868 11868 E mono    :    at Java.Lang.Object.GetObject(IntPtr handle, JniHandleOwnership transfer, Type type)
12-14 08:50:08.292 11868 11868 E mono    :    at Java.Lang.Object._GetObject[LayoutInflater](IntPtr handle, JniHandleOwnership transfer)
12-14 08:50:08.292 11868 11868 E mono    :    at Java.Lang.Object.GetObject[LayoutInflater](IntPtr handle, JniHandleOwnership transfer)
12-14 08:50:08.292 11868 11868 E mono    :    at Android.App.Activity.get_LayoutInflater()
12-14 08:50:08.292 11868 11868 E mono    :    at Xamarin.Forms.Platform.Android.FormsAppCompatActivity.OnCreate(Bundle savedInstanceState, ActivationFlags flags)
12-14 08:50:08.292 11868 11868 E mono    :    at Xamarin.Forms.Platform.Android.FormsAppCompatActivity.OnCreate(Bundle savedInstanceState)
12-14 08:50:08.292 11868 11868 E mono    :    at HelloForms.Droid.MainActivity.OnCreate(Bundle savedInstanceState)
12-14 08:50:08.292 11868 11868 E mono    :    at Android.App.Activity.n_OnCreate_Landroid_os_Bundle_(IntPtr jnienv, IntPtr native__this, IntPtr native_savedInstanceState)
12-14 08:50:08.292 11868 11868 E mono    :    at Android.Runtime.DynamicMethodNameCounter.5(IntPtr , IntPtr , IntPtr )

This works if you have a Release build of Java.Interop.dll because this assertion is stripped away:

https://github.com/xamarin/java.interop/blob/2f62ffd4367870802f146c7957a94839daf1b86d/src/Java.Interop/Java.Interop/JniPeerMembers.cs#L27-L34

We think there must be some issue with type maps in this project?

We probably won't be able to look into this until January, so I thought I'd post this so we don't forget.
@jonathanpeppers jonathanpeppers added Area: App+Library Build Issues when building Library projects or Application projects. Area: App Runtime Issues in `libmonodroid.so`. labels Dec 14, 2020
@jonathanpeppers jonathanpeppers added this to the One .NET milestone Dec 14, 2020
grendello added a commit to grendello/xamarin-android that referenced this issue Jan 5, 2021
@grendello
[typemap] Handle managed -> Java duplicate mapping correctly
95de74b 
Fixes: dotnet#5409
Context: a017561
Context: bb55bb0

This is another commit in the series of properly handling the N:1 type
mapping from Java to Managed types.

a017561 implemented most of the handling properly, bb55bb0 fixed it
up for generic types but neither of the two commits accounted for the
situation when a Managed type map is requested that points back to a
duplicate Java type.  In fact, such Managed types were removed from the
typemap unless they were the type pointed to from the Java duplicate.
This meant that, effectively, all the `*Invoker` classes were not part
of the mapping, leading to this error for Debug builds:

    app_process32: ---- DEBUG ASSERTION FAILED ----
    app_process32: ---- Assert Short Message ----
    app_process32: ManagedPeerType <=> JniTypeName Mismatch! javaVM.GetJniTypeInfoForType(typeof(Android.Views.LayoutInflaterInvoker)).JniTypeName="" != "android/view/LayoutInflater"
    app_process32: ---- Assert Long Message ----
    app_process32:
    app_process32:    at System.Diagnostics.DebugProvider.Fail(String message, String detailMessage)
    app_process32:    at System.Diagnostics.Debug.Fail(String message, String detailMessage)
    app_process32:    at System.Diagnostics.Debug.Assert(Boolean condition, String message, String detailMessage)
    app_process32:    at System.Diagnostics.Debug.Assert(Boolean condition, String message)
    app_process32:    at Java.Interop.JniPeerMembers..ctor(String jniPeerTypeName, Type managedPeerType, Boolean checkManagedPeerType, Boolean isInterface)
    app_process32:    at Java.Interop.JniPeerMembers..ctor(String jniPeerTypeName, Type managedPeerType)
    app_process32:    at Android.Runtime.XAPeerMembers..ctor(String jniPeerTypeName, Type managedPeerType)
    app_process32:    at Android.Views.LayoutInflaterInvoker..cctor()
    app_process32:    at System.Reflection.RuntimeConstructorInfo.InternalInvoke(RuntimeConstruct
            : CLR: Managed code called FailFast, saying "ManagedPeerType <=> JniTypeName Mismatch! javaVM.GetJniTypeInfoForType(typeof(Android.Views.LayoutInflaterInvoker)).JniTypeName="" != "android/view/LayoutInflater"
            :    at System.Diagnostics.DebugProvider.Fail(String message, String detailMessage)
            :    at System.Diagnostics.Debug.Fail(String message, String detailMessage)
            :    at System.Diagnostics.Debug.Assert(Boolean condition, String message, String detailMessage)
            :    at System.Diagnostics.Debug.Assert(Boolean condition, String message)
            :    at Java.Interop.JniPeerMembers..ctor(String jniPeerTypeName, Type managedPeerType, Boolean checkManagedPeerType, Boolean isInterface)
            :    at Java.Interop.JniPeerMembers..ctor(String jniPeerTypeName, Type managedPeerType)
            :    at Android.Runtime.XAPeerMembers..ctor(String jniPeerTypeName, Type managedPeerType)
            :    at Android.Views.LayoutInflaterInvoker..cctor()

This commit modifies the mapping code to make sure that all duplicate
Java types point to the **first** Managed type but that all the Managed
types point back to their original Java type.
@grendello grendello mentioned this issue Jan 5, 2021
Merged
jonpryor pushed a commit that referenced this issue Jan 7, 2021
@grendello
[monodroid] Handle managed -> Java duplicate type mapping correctly (#…
66f7206 
…5459)

Fixes: #5409

Context: a017561
Context: bb55bb0

Yet Another Java :: Managed Type Aliasing Issue.

Type aliasing occurs when multiple managed types bind the same Java
type.  One common scenario for this is for `abstract` classes:

	// Java:
	public abstract class LayoutInflater {
	    // …
	}

	// C# Binding
	[Register ("android/view/LayoutInflater", DoNotGenerateAcw=true)]
	public abstract class LayoutInflater : Java.Lang.Object {
	    static readonly JniPeerMembers _members = new XAPeerMembers ("android/view/LayoutInflater", typeof (LayoutInflater));
	}

	// Used at runtime
	[Register ("android/view/LayoutInflater", DoNotGenerateAcw=true)]
	internal partial class LayoutInflaterInvoker : LayoutInflater {
	    static readonly JniPeerMembers _members = new XAPeerMembers ("android/view/LayoutInflater", typeof (LayoutInflaterInvoker));
	}

Both the C# `LayoutInflater` and `LayoutInflaterInvoker` types *alias*
the Java `LayoutInflater` type.

In a *Debug* configuration build, the mappings between the Java types
and Managed types is held within a per-assembly mapping (7117414),
and because of a017561 there is no explicit managed entry for
`LayoutInflaterInvoker`:

	DebugTypemap = {
	    .java_to_managed = {
	        { "android/view/LayoutInflater", 0 },   // Java LayoutInflater -> C# LayoutInflater
	        { "android/view/LayoutInflater", 0 },   // Java LayoutInflater -> C# LayoutInflater
	    },
	    .managed_to_java = {
	        { "Android.Views.LayoutInflater", 0 },  // C# LayoutInflater        -> Java LayoutInflater
	        { "Android.Views.LayoutInflater", 0 },  // C# LayoutInflaterInvoker -> Java LayoutInflater
	    },
	}

At *runtime* when the `LayoutInflaterInvoker` static constructor is
executed, we hit an [assert in the `JniPeerMembers` constructor][0]:

	app_process32: ---- DEBUG ASSERTION FAILED ----
	app_process32: ---- Assert Short Message ----
	app_process32: ManagedPeerType <=> JniTypeName Mismatch! javaVM.GetJniTypeInfoForType(typeof(Android.Views.LayoutInflaterInvoker)).JniTypeName="" != "android/view/LayoutInflater"
	app_process32: ---- Assert Long Message ----
	app_process32:
	app_process32:    at System.Diagnostics.DebugProvider.Fail(String message, String detailMessage)
	app_process32:    at System.Diagnostics.Debug.Fail(String message, String detailMessage)
	app_process32:    at System.Diagnostics.Debug.Assert(Boolean condition, String message, String detailMessage)
	app_process32:    at System.Diagnostics.Debug.Assert(Boolean condition, String message)
	app_process32:    at Java.Interop.JniPeerMembers..ctor(String jniPeerTypeName, Type managedPeerType, Boolean checkManagedPeerType, Boolean isInterface)
	app_process32:    at Java.Interop.JniPeerMembers..ctor(String jniPeerTypeName, Type managedPeerType)
	app_process32:    at Android.Runtime.XAPeerMembers..ctor(String jniPeerTypeName, Type managedPeerType)
	app_process32:    at Android.Views.LayoutInflaterInvoker..cctor()
	app_process32:    at System.Reflection.RuntimeConstructorInfo.InternalInvoke(RuntimeConstruct
	        : CLR: Managed code called FailFast, saying "ManagedPeerType <=> JniTypeName Mismatch! javaVM.GetJniTypeInfoForType(typeof(Android.Views.LayoutInflaterInvoker)).JniTypeName="" != "android/view/LayoutInflater"
	        :    at System.Diagnostics.DebugProvider.Fail(String message, String detailMessage)
	        :    at System.Diagnostics.Debug.Fail(String message, String detailMessage)
	        :    at System.Diagnostics.Debug.Assert(Boolean condition, String message, String detailMessage)
	        :    at System.Diagnostics.Debug.Assert(Boolean condition, String message)
	        :    at Java.Interop.JniPeerMembers..ctor(String jniPeerTypeName, Type managedPeerType, Boolean checkManagedPeerType, Boolean isInterface)
	        :    at Java.Interop.JniPeerMembers..ctor(String jniPeerTypeName, Type managedPeerType)
	        :    at Android.Runtime.XAPeerMembers..ctor(String jniPeerTypeName, Type managedPeerType)
	        :    at Android.Views.LayoutInflaterInvoker..cctor()

The cause of the assertion failure is because the `.managed_to_java`
table doesn't contain an entry for `LayoutInflaterInvoker`.

The fix is to modify a017561 behavior and *retain* the `*Invoker`
types in the `.managed_to_java` table:

	DebugTypemap = {
	    .java_to_managed = {
	        { "android/view/LayoutInflater", 0 },   // Java LayoutInflater -> C# LayoutInflater
	        { "android/view/LayoutInflater", 0 },   // Java LayoutInflater -> C# LayoutInflater
	    },
	    .managed_to_java = {
	        { "Android.Views.LayoutInflater", 0 },          // C# LayoutInflater        -> Java LayoutInflater
	        { "Android.Views.LayoutInflaterInvoker", 0 },   // C# LayoutInflaterInvoker -> Java LayoutInflater
	    },
	}

This ensures that we can appropriately obtain a Java type name
for the `LayoutInflaterInvoker` type, fixing the assert.

[0]: https://github.com/xamarin/java.interop/blob/3894cd76f71f618949c8542f0edd95762e22881f/src/Java.Interop/Java.Interop/JniPeerMembers.cs#L29
jonpryor pushed a commit that referenced this issue Jan 15, 2021
@grendello @jonpryor
[monodroid] Handle managed -> Java duplicate type mapping correctly (#…
79a0d54 
…5459)

Fixes: #5409

Context: a017561
Context: bb55bb0

Yet Another Java :: Managed Type Aliasing Issue.

Type aliasing occurs when multiple managed types bind the same Java
type.  One common scenario for this is for `abstract` classes:

	// Java:
	public abstract class LayoutInflater {
	    // …
	}

	// C# Binding
	[Register ("android/view/LayoutInflater", DoNotGenerateAcw=true)]
	public abstract class LayoutInflater : Java.Lang.Object {
	    static readonly JniPeerMembers _members = new XAPeerMembers ("android/view/LayoutInflater", typeof (LayoutInflater));
	}

	// Used at runtime
	[Register ("android/view/LayoutInflater", DoNotGenerateAcw=true)]
	internal partial class LayoutInflaterInvoker : LayoutInflater {
	    static readonly JniPeerMembers _members = new XAPeerMembers ("android/view/LayoutInflater", typeof (LayoutInflaterInvoker));
	}

Both the C# `LayoutInflater` and `LayoutInflaterInvoker` types *alias*
the Java `LayoutInflater` type.

In a *Debug* configuration build, the mappings between the Java types
and Managed types is held within a per-assembly mapping (7117414),
and because of a017561 there is no explicit managed entry for
`LayoutInflaterInvoker`:

	DebugTypemap = {
	    .java_to_managed = {
	        { "android/view/LayoutInflater", 0 },   // Java LayoutInflater -> C# LayoutInflater
	        { "android/view/LayoutInflater", 0 },   // Java LayoutInflater -> C# LayoutInflater
	    },
	    .managed_to_java = {
	        { "Android.Views.LayoutInflater", 0 },  // C# LayoutInflater        -> Java LayoutInflater
	        { "Android.Views.LayoutInflater", 0 },  // C# LayoutInflaterInvoker -> Java LayoutInflater
	    },
	}

At *runtime* when the `LayoutInflaterInvoker` static constructor is
executed, we hit an [assert in the `JniPeerMembers` constructor][0]:

	app_process32: ---- DEBUG ASSERTION FAILED ----
	app_process32: ---- Assert Short Message ----
	app_process32: ManagedPeerType <=> JniTypeName Mismatch! javaVM.GetJniTypeInfoForType(typeof(Android.Views.LayoutInflaterInvoker)).JniTypeName="" != "android/view/LayoutInflater"
	app_process32: ---- Assert Long Message ----
	app_process32:
	app_process32:    at System.Diagnostics.DebugProvider.Fail(String message, String detailMessage)
	app_process32:    at System.Diagnostics.Debug.Fail(String message, String detailMessage)
	app_process32:    at System.Diagnostics.Debug.Assert(Boolean condition, String message, String detailMessage)
	app_process32:    at System.Diagnostics.Debug.Assert(Boolean condition, String message)
	app_process32:    at Java.Interop.JniPeerMembers..ctor(String jniPeerTypeName, Type managedPeerType, Boolean checkManagedPeerType, Boolean isInterface)
	app_process32:    at Java.Interop.JniPeerMembers..ctor(String jniPeerTypeName, Type managedPeerType)
	app_process32:    at Android.Runtime.XAPeerMembers..ctor(String jniPeerTypeName, Type managedPeerType)
	app_process32:    at Android.Views.LayoutInflaterInvoker..cctor()
	app_process32:    at System.Reflection.RuntimeConstructorInfo.InternalInvoke(RuntimeConstruct
	        : CLR: Managed code called FailFast, saying "ManagedPeerType <=> JniTypeName Mismatch! javaVM.GetJniTypeInfoForType(typeof(Android.Views.LayoutInflaterInvoker)).JniTypeName="" != "android/view/LayoutInflater"
	        :    at System.Diagnostics.DebugProvider.Fail(String message, String detailMessage)
	        :    at System.Diagnostics.Debug.Fail(String message, String detailMessage)
	        :    at System.Diagnostics.Debug.Assert(Boolean condition, String message, String detailMessage)
	        :    at System.Diagnostics.Debug.Assert(Boolean condition, String message)
	        :    at Java.Interop.JniPeerMembers..ctor(String jniPeerTypeName, Type managedPeerType, Boolean checkManagedPeerType, Boolean isInterface)
	        :    at Java.Interop.JniPeerMembers..ctor(String jniPeerTypeName, Type managedPeerType)
	        :    at Android.Runtime.XAPeerMembers..ctor(String jniPeerTypeName, Type managedPeerType)
	        :    at Android.Views.LayoutInflaterInvoker..cctor()

The cause of the assertion failure is because the `.managed_to_java`
table doesn't contain an entry for `LayoutInflaterInvoker`.

The fix is to modify a017561 behavior and *retain* the `*Invoker`
types in the `.managed_to_java` table:

	DebugTypemap = {
	    .java_to_managed = {
	        { "android/view/LayoutInflater", 0 },   // Java LayoutInflater -> C# LayoutInflater
	        { "android/view/LayoutInflater", 0 },   // Java LayoutInflater -> C# LayoutInflater
	    },
	    .managed_to_java = {
	        { "Android.Views.LayoutInflater", 0 },          // C# LayoutInflater        -> Java LayoutInflater
	        { "Android.Views.LayoutInflaterInvoker", 0 },   // C# LayoutInflaterInvoker -> Java LayoutInflater
	    },
	}

This ensures that we can appropriately obtain a Java type name
for the `LayoutInflaterInvoker` type, fixing the assert.

[0]: https://github.com/xamarin/java.interop/blob/3894cd76f71f618949c8542f0edd95762e22881f/src/Java.Interop/Java.Interop/JniPeerMembers.cs#L29
@jonpryor jonpryor added the bug Component does not function as intended. label Apr 13, 2021
@ghost ghost locked as resolved and limited conversation to collaborators Jun 3, 2022
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@grendello grendello

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Area: App+Library Build Issues when building Library projects or Application projects. Area: App Runtime Issues in `libmonodroid.so`. bug Component does not function as intended.
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[typemap] Handle managed -> Java duplicate mapping correctly grendello/xamarin-android
3 participants
@jonpryor @grendello @jonathanpeppers