Visual Studio update to 16.9.4 cause binding library build fail

[yori999]

Error Message or Issue

When visual studio is 16.8.x,my binding library work fine,now i update to 16.9.4,build error.
platform is windows

1>  未经处理的异常:  System.NullReferenceException: 未将对象引用设置到对象的实例。 (TaskId:75)
1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\MSBuild\Xamarin\Android\Xamarin.Android.Bindings.Core.targets(46,5): message BG0000: 未经处理的异常:  System.NullReferenceException: 未将对象引用设置到对象的实例。 (TaskId:75)
1>     在 Xamarin.SourceWriter.MethodWriter.WriteReturnType(CodeWriter writer) 位置 /Users/builder/azdo/_work/278/s/xamarin-android/external/Java.Interop/src/Xamarin.SourceWriter/Models/MethodWriter.cs:行号 154 (TaskId:75)
1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\MSBuild\Xamarin\Android\Xamarin.Android.Bindings.Core.targets(46,5): message BG0000:    在 Xamarin.SourceWriter.MethodWriter.WriteReturnType(CodeWriter writer) 位置 /Users/builder/azdo/_work/278/s/xamarin-android/external/Java.Interop/src/Xamarin.SourceWriter/Models/MethodWriter.cs:行号 154 (TaskId:75)
1>     在 Xamarin.SourceWriter.MethodWriter.WriteSignature(CodeWriter writer) 位置 /Users/builder/azdo/_work/278/s/xamarin-android/external/Java.Interop/src/Xamarin.SourceWriter/Models/MethodWriter.cs:行号 105 (TaskId:75)
1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\MSBuild\Xamarin\Android\Xamarin.Android.Bindings.Core.targets(46,5): message BG0000:    在 Xamarin.SourceWriter.MethodWriter.WriteSignature(CodeWriter writer) 位置 /Users/builder/azdo/_work/278/s/xamarin-android/external/Java.Interop/src/Xamarin.SourceWriter/Models/MethodWriter.cs:行号 105 (TaskId:75)
1>     在 Xamarin.SourceWriter.TypeWriter.WriteMembersByPriority(CodeWriter writer) 位置 /Users/builder/azdo/_work/278/s/xamarin-android/external/Java.Interop/src/Xamarin.SourceWriter/Models/TypeWriter.cs:行号 179 (TaskId:75)
1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\MSBuild\Xamarin\Android\Xamarin.Android.Bindings.Core.targets(46,5): message BG0000:    在 Xamarin.SourceWriter.TypeWriter.WriteMembersByPriority(CodeWriter writer) 位置 /Users/builder/azdo/_work/278/s/xamarin-android/external/Java.Interop/src/Xamarin.SourceWriter/Models/TypeWriter.cs:行号 179 (TaskId:75)
1>     在 Xamarin.SourceWriter.TypeWriter.Write(CodeWriter writer) 位置 /Users/builder/azdo/_work/278/s/xamarin-android/external/Java.Interop/src/Xamarin.SourceWriter/Models/TypeWriter.cs:行号 83 (TaskId:75)
1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\MSBuild\Xamarin\Android\Xamarin.Android.Bindings.Core.targets(46,5): message BG0000:    在 Xamarin.SourceWriter.TypeWriter.Write(CodeWriter writer) 位置 /Users/builder/azdo/_work/278/s/xamarin-android/external/Java.Interop/src/Xamarin.SourceWriter/Models/TypeWriter.cs:行号 83 (TaskId:75)
1>     在 generator.SourceWriters.BoundClass.Write(CodeWriter writer) 位置 /Users/builder/azdo/_work/278/s/xamarin-android/external/Java.Interop/tools/generator/SourceWriters/BoundClass.cs:行号 365 (TaskId:75)
1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\MSBuild\Xamarin\Android\Xamarin.Android.Bindings.Core.targets(46,5): message BG0000:    在 generator.SourceWriters.BoundClass.Write(CodeWriter writer) 位置 /Users/builder/azdo/_work/278/s/xamarin-android/external/Java.Interop/tools/generator/SourceWriters/BoundClass.cs:行号 365 (TaskId:75)
1>     在 generator.SourceWriters.BoundInterface.WritePreSiblingClasses(CodeWriter writer) 位置 /Users/builder/azdo/_work/278/s/xamarin-android/external/Java.Interop/tools/generator/SourceWriters/BoundInterface.cs:行号 253 (TaskId:75)
1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\MSBuild\Xamarin\Android\Xamarin.Android.Bindings.Core.targets(46,5): message BG0000:    在 generator.SourceWriters.BoundInterface.WritePreSiblingClasses(CodeWriter writer) 位置 /Users/builder/azdo/_work/278/s/xamarin-android/external/Java.Interop/tools/generator/SourceWriters/BoundInterface.cs:行号 253 (TaskId:75)
1>     在 generator.SourceWriters.BoundInterface.Write(CodeWriter writer) 位置 /Users/builder/azdo/_work/278/s/xamarin-android/external/Java.Interop/tools/generator/SourceWriters/BoundInterface.cs:行号 243 (TaskId:75)
1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\MSBuild\Xamarin\Android\Xamarin.Android.Bindings.Core.targets(46,5): message BG0000:    在 generator.SourceWriters.BoundInterface.Write(CodeWriter writer) 位置 /Users/builder/azdo/_work/278/s/xamarin-android/external/Java.Interop/tools/generator/SourceWriters/BoundInterface.cs:行号 243 (TaskId:75)
1>     在 MonoDroid.Generation.InterfaceGen.Generate(CodeGenerationOptions opt, GenerationInfo gen_info) 位置 /Users/builder/azdo/_work/278/s/xamarin-android/external/Java.Interop/tools/generator/Java.Interop.Tools.Generator.ObjectModel/InterfaceGen.cs:行号 94 (TaskId:75)
1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\MSBuild\Xamarin\Android\Xamarin.Android.Bindings.Core.targets(46,5): message BG0000:    在 MonoDroid.Generation.InterfaceGen.Generate(CodeGenerationOptions opt, GenerationInfo gen_info) 位置 /Users/builder/azdo/_work/278/s/xamarin-android/external/Java.Interop/tools/generator/Java.Interop.Tools.Generator.ObjectModel/InterfaceGen.cs:行号 94 (TaskId:75)
1>     在 Xamarin.Android.Binder.CodeGenerator.Run(CodeGeneratorOptions options, DirectoryAssemblyResolver resolver) 位置 /Users/builder/azdo/_work/278/s/xamarin-android/external/Java.Interop/tools/generator/CodeGenerator.cs:行号 193 (TaskId:75)
1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\MSBuild\Xamarin\Android\Xamarin.Android.Bindings.Core.targets(46,5): message BG0000:    在 Xamarin.Android.Binder.CodeGenerator.Run(CodeGeneratorOptions options, DirectoryAssemblyResolver resolver) 位置 /Users/builder/azdo/_work/278/s/xamarin-android/external/Java.Interop/tools/generator/CodeGenerator.cs:行号 193 (TaskId:75)
1>     在 Xamarin.Android.Binder.CodeGenerator.Run(CodeGeneratorOptions options) 位置 /Users/builder/azdo/_work/278/s/xamarin-android/external/Java.Interop/tools/generator/CodeGenerator.cs:行号 37 (TaskId:75)
1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\MSBuild\Xamarin\Android\Xamarin.Android.Bindings.Core.targets(46,5): message BG0000:    在 Xamarin.Android.Binder.CodeGenerator.Run(CodeGeneratorOptions options) 位置 /Users/builder/azdo/_work/278/s/xamarin-android/external/Java.Interop/tools/generator/CodeGenerator.cs:行号 37 (TaskId:75)
1>     在 Xamarin.Android.Binder.CodeGenerator.Main(String[] args) 位置 /Users/builder/azdo/_work/278/s/xamarin-android/external/Java.Interop/tools/generator/CodeGenerator.cs:行号 27 (TaskId:75)
1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\MSBuild\Xamarin\Android\Xamarin.Android.Bindings.Core.targets(46,5): message BG0000:    在 Xamarin.Android.Binder.CodeGenerator.Main(String[] args) 位置 /Users/builder/azdo/_work/278/s/xamarin-android/external/Java.Interop/tools/generator/CodeGenerator.cs:行号 27 (TaskId:75)
1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\MSBuild\Xamarin\Android\Xamarin.Android.Bindings.Core.targets(46,5): error MSB6006: "generator.exe" exited with code -1073741819.
1>Done executing task "BindingsGenerator" -- FAILED. (TaskId:75)
1>Done building target "GenerateBindings" in project "vCloud.AndroidShareLibrary.csproj" -- FAILED.: (TargetId:55)

Version Information

Microsoft Visual Studio Enterprise 2019 Version 16.9.4 VisualStudio.16.Release/16.9.4+31205.134 Microsoft .NET Framework Version 4.8.03752

Installed Version: Enterprise

Visual C++ 2019 00433-90000-00004-AA199
Microsoft Visual C++ 2019

.NET Core Debugging with WSL 2 1.0
.NET Core Debugging with WSL 2

ASP.NET and Web Tools 2019 16.9.693.2781
ASP.NET and Web Tools 2019

ASP.NET Core Razor Language Services 16.1.0.2112521+5741df381174d72f08e3632bb99f52e8635b6a1a
Provides languages services for ASP.NET Core Razor.

ASP.NET Web Frameworks and Tools 2019 16.9.693.2781
For additional information, visit https://www.asp.net/

Azure App Service Tools v3.0.0 16.9.693.2781
Azure App Service Tools v3.0.0

Azure Functions and Web Jobs Tools 16.9.693.2781
Azure Functions and Web Jobs Tools

C# Tools 3.9.0-6.21160.10+59eedc33d35754759994155ea2f4e1012a9951e3
C# components used in the IDE. Depending on your project type and settings, a different version of the compiler may be used.

Common Azure Tools 1.10
Provides common services for use by Azure Mobile Services and Microsoft Azure Tools.

Extensibility Message Bus 1.2.6 (master@34d6af2)
Provides common messaging-based MEF services for loosely coupled Visual Studio extension components communication and integration.

IntelliCode Extension 1.0
IntelliCode Visual Studio Extension Detailed Info

Linux Core Dump Debugging 1.0.9.31201
Enables debugging of Linux core dumps.

Microsoft Azure Tools 2.9
Microsoft Azure Tools for Microsoft Visual Studio 2019 - v2.9.40331.1

Microsoft Continuous Delivery Tools for Visual Studio 0.4
Simplifying the configuration of Azure DevOps pipelines from within the Visual Studio IDE.

Microsoft JVM Debugger 1.0
Provides support for connecting the Visual Studio debugger to JDWP compatible Java Virtual Machines

Microsoft Library Manager 2.1.113+g422d40002e.RR
Install client-side libraries easily to any web project

Microsoft MI-Based Debugger 1.0
Provides support for connecting Visual Studio to MI compatible debuggers

Microsoft Visual C++ Wizards 1.0
Microsoft Visual C++ Wizards

Microsoft Visual Studio Tools for Containers 1.1
Develop, run, validate your ASP.NET Core applications in the target environment. F5 your application directly into a container with debugging, or CTRL + F5 to edit & refresh your app without having to rebuild the container.

Microsoft Visual Studio VC Package 1.0
Microsoft Visual Studio VC Package

Mono Debugging for Visual Studio 16.9.7 (df23ba6)
Support for debugging Mono processes with Visual Studio.

NuGet Package Manager 5.9.0
NuGet Package Manager in Visual Studio. For more information about NuGet, visit https://docs.nuget.org/

ProjectServicesPackage Extension 1.0
ProjectServicesPackage Visual Studio Extension Detailed Info

Snapshot Debugging Extension 1.0
Snapshot Debugging Visual Studio Extension Detailed Info

SQL Server Data Tools 16.0.62103.10080
Microsoft SQL Server Data Tools

Test Adapter for Boost.Test 1.0
Enables Visual Studio's testing tools with unit tests written for Boost.Test. The use terms and Third Party Notices are available in the extension installation directory.

Test Adapter for Google Test 1.0
Enables Visual Studio's testing tools with unit tests written for Google Test. The use terms and Third Party Notices are available in the extension installation directory.

TypeScript Tools 16.0.30201.2001
TypeScript Tools for Microsoft Visual Studio

Visual Basic Tools 3.9.0-6.21160.10+59eedc33d35754759994155ea2f4e1012a9951e3
Visual Basic components used in the IDE. Depending on your project type and settings, a different version of the compiler may be used.

Visual C++ for Cross Platform Mobile Development (Android) 16.0.31025.194
Visual C++ for Cross Platform Mobile Development (Android)

Visual C++ for Linux Development 1.0.9.31201
Visual C++ for Linux Development

Visual F# Tools 16.9.0-beta.21102.9+7ce7132f1459095e635194d09d6f73265352029a
Microsoft Visual F# Tools

Visual Studio Code Debug Adapter Host Package 1.0
Interop layer for hosting Visual Studio Code debug adapters in Visual Studio

Visual Studio Container Tools Extensions 1.0
View, manage, and diagnose containers within Visual Studio.

Visual Studio Tools for CMake 1.0
Visual Studio Tools for CMake

Visual Studio Tools for Containers 1.0
Visual Studio Tools for Containers

VisualStudio.DeviceLog 1.0
Information about my package

VisualStudio.Foo 1.0
Information about my package

VisualStudio.Mac 1.0
Mac Extension for Visual Studio

VisualSVN 7.2.0
Integration with Subversion version control. For more information about VisualSVN, see the VisualSVN website at https://www.visualsvn.com
Copyright © 2019 VisualSVN Software Ltd. All rights reserved.

Xamarin 16.9.000.273 (d16-9@1bba9e0)
Visual Studio extension to enable development for Xamarin.iOS and Xamarin.Android.

Xamarin Designer 16.9.0.318 (remotes/origin/7b35adcdd1b204bbdcb279e0f029d151a20a4bf3@7b35adcdd)
Visual Studio extension to enable Xamarin Designer tools in Visual Studio.

Xamarin Templates 16.9.72 (426ebf6)
Templates for building iOS, Android, and Windows apps with Xamarin and Xamarin.Forms.

Xamarin.Android SDK 11.2.2.1 (d16-9/877f572)
Xamarin.Android Reference Assemblies and MSBuild support.
Mono: 5e9cb6d
Java.Interop: xamarin/java.interop/d16-9@54f8c24
ProGuard: Guardsquare/proguard@912d149
SQLite: xamarin/sqlite@daff8f4
Xamarin.Android Tools: xamarin/xamarin-android-tools/d16-9@d210f11

Xamarin.iOS and Xamarin.Mac SDK 14.14.2.5 (3836759d4)
Xamarin.iOS and Xamarin.Mac Reference Assemblies and MSBuild support.

Log File

log.txt

Other Helpful Info

[jpobst]

Can you provide a sample project or .jar/.aar that reproduces the issue?

From the error message, my best guess is that this is generating the return type for a method inside a class nested inside an interface. (In the vCloud.AndroidShareLibrary.csproj project.)

I tried to reproduce the error with this Java, but it did not crash:

package example;

public interface MyInterface
{
    public class MyClass
    {
        public void DoSomething () {}
        public int DoSomethingInt () { return 0; }
        public MyClass DoSomethingMyClass () { return new MyClass (); }
    }
}

[yori999]

vCloud.AndroidShareLibrary.zip
but 16.8.x,this binding library work fine,no error,i just update the visual studio

[yori999]

@jpobst Is there any way solve this problem

[jpobst]

You can use metadata <remove-node> to remove FlowIterator if you do not need it. Unfortunately I don't see any way to use metadata to correct this issue.

I'll fix this regression for future versions, but you may need to downgrade back to 16.8 if you need the FlowIterator types.

[yori999]

Thanks,It's worked for me,i don't need FlowIterator types