Solution using Amazon.Lambda.Annotations fails to compile with AWSLambda0001 error

[martincostello]

Description

I created a small sample app to experiment with Amazon.Lambda.Annotations, but it fails to compile and outputs the following compiler error:

> dotnet build
Microsoft (R) Build Engine version 17.0.0+c9eb9dd64 for .NET
Copyright (C) Microsoft Corporation. All rights reserved.

  Determining projects to restore...
  All projects are up-to-date for restore.
CSC : error AWSLambda0001: This is a bug. Please run the build with detailed verbosity (dotnet build --verbosity detailed) and file a bug at https://github.com/aws/aws-lambda-dotnet with the build output and stack trace Object reference not set to an instance of an object.   at Amazon.Lambda.Annotations.SourceGenerator.Models.TypeModelBuilder.Build(ITypeSymbol symbol, GeneratorExecutionContext context) [C:\Coding\martincostello\dotnet-lambda-annotations\src\LambdaAnnotations\LambdaAnnotations.csproj]

Build FAILED.

CSC : error AWSLambda0001: This is a bug. Please run the build with detailed verbosity (dotnet build --verbosity detailed) and file a bug at https://github.com/aws/aws-lambda-dotnet with the build output and stack trace Object reference not set to an instance of an object.   at Amazon.Lambda.Annotations.SourceGenerator.Models.TypeModelBuilder.Build(ITypeSymbol symbol, GeneratorExecutionContext context) [C:\Coding\martincostello\dotnet-lambda-annotations\src\LambdaAnnotations\LambdaAnnotations.csproj]
    0 Warning(s)
    1 Error(s)

Time Elapsed 00:00:00.86

Reproduction Steps

Clone martincostello/dotnet-lambda-annotations at commit 6103a4b6b5dbdafa7ba9f04f98f6238f38eb3add and run dotnet build.

Logs

   3:7>Target "CoreCompile" in file "C:\Program Files\dotnet\sdk\6.0.101\Roslyn\Microsoft.CSharp.Core.targets" from project "C:\Coding\martincostello\dotnet-lambda-annotations\src\LambdaAnnotations\LambdaAnnotations.csproj" (target "Compile" depends on it):
       Building target "CoreCompile" completely.
       Output file "obj\Debug\net6.0\LambdaAnnotations.dll" does not exist.
       Using "Csc" task from assembly "C:\Program Files\dotnet\sdk\6.0.101\Roslyn\Microsoft.Build.Tasks.CodeAnalysis.dll".
       Task "Csc"
         C:\Program Files\dotnet\dotnet.exe exec "C:\Program Files\dotnet\sdk\6.0.101\Roslyn\bincore\csc.dll" /noconfig /unsafe- /checked- /nowarn:1701,1702,1701,1702 /fullpaths /nostdlib+ /errorreport:prompt /warn:6 /define:TRACE;DEBUG;NET;NET6_0;NETCOREAPP;NET5_0_OR_GREATER;NET6_0_OR_GREATER;NETCOREAPP1_0_OR_GREATER;NETCOREAPP1_1_OR_GREATER;NETCOREAPP2_0_OR_GREATER;NETCOREAPP2_1_OR_GREATER;NETCOREAPP2_2_OR_GREATER;NETCOREAPP3_0_OR_GREATER;NETCOREAPP3_1_OR_GREATER /highentropyva+ /nullable:enable /reference:C:\Users\martin.costello\.nuget\packages\amazon.lambda.annotations\0.4.2-preview\lib\net6.0\Amazon.Lambda.Annotations.dll /reference:C:\Users\martin.costello\.nuget\packages\amazon.lambda.core\2.1.0\lib\net6.0\Amazon.Lambda.Core.dll /reference:C:\Users\martin.costello\.nuget\packages\amazon.lambda.serialization.systemtextjson\2.2.0\lib\net6.0\Amazon.Lambda.Serialization.SystemTextJson.dll /reference:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\6.0.1\ref\net6.0\Microsoft.CSharp.dll" /reference:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\6.0.1\ref\net6.0\Microsoft.VisualBasic.Core.dll" /reference:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\6.0.1\ref\net6.0\Microsoft.VisualBasic.dll" /reference:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\6.0.1\ref\net6.0\Microsoft.Win32.Primitives.dll" /reference:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\6.0.1\ref\net6.0\Microsoft.Win32.Registry.dll" /reference:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\6.0.1\ref\net6.0\mscorlib.dll" /reference:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\6.0.1\ref\net6.0\netstandard.dll" /reference:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\6.0.1\ref\net6.0\System.AppContext.dll" /reference:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\6.0.1\ref\net6.0\System.Buffers.dll" /reference:"C:\Program 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Files\dotnet\packs\Microsoft.NETCore.App.Ref\6.0.1\ref\net6.0\System.Xml.dll" /reference:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\6.0.1\ref\net6.0\System.Xml.Linq.dll" /reference:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\6.0.1\ref\net6.0\System.Xml.ReaderWriter.dll" /reference:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\6.0.1\ref\net6.0\System.Xml.Serialization.dll" /reference:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\6.0.1\ref\net6.0\System.Xml.XDocument.dll" /reference:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\6.0.1\ref\net6.0\System.Xml.XmlDocument.dll" /reference:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\6.0.1\ref\net6.0\System.Xml.XmlSerializer.dll" /reference:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\6.0.1\ref\net6.0\System.Xml.XPath.dll" /reference:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\6.0.1\ref\net6.0\System.Xml.XPath.XDocument.dll" /reference:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\6.0.1\ref\net6.0\WindowsBase.dll" /debug+ /debug:portable /filealign:512 /optimize- /out:obj\Debug\net6.0\LambdaAnnotations.dll /refout:obj\Debug\net6.0\ref\LambdaAnnotations.dll /ruleset:C:\Coding\martincostello\dotnet-lambda-annotations\LambdaAnnotations.ruleset /target:library /warnaserror+ /utf8output /deterministic+ /langversion:latest /analyzerconfig:C:\Coding\martincostello\dotnet-lambda-annotations\.editorconfig /analyzerconfig:obj\Debug\net6.0\LambdaAnnotations.GeneratedMSBuildEditorConfig.editorconfig /analyzerconfig:"C:\Program Files\dotnet\sdk\6.0.101\Sdks\Microsoft.NET.Sdk\analyzers\build\config\analysislevel_6_all.editorconfig" /analyzer:"C:\Program Files\dotnet\sdk\6.0.101\Sdks\Microsoft.NET.Sdk\targets\..\analyzers\Microsoft.CodeAnalysis.CSharp.NetAnalyzers.dll" /analyzer:"C:\Program Files\dotnet\sdk\6.0.101\Sdks\Microsoft.NET.Sdk\targets\..\analyzers\Microsoft.CodeAnalysis.NetAnalyzers.dll" /analyzer:C:\Users\martin.costello\.nuget\packages\amazon.lambda.annotations\0.4.2-preview\analyzers\dotnet\cs\Amazon.Lambda.Annotations.SourceGenerator.dll /analyzer:C:\Users\martin.costello\.nuget\packages\amazon.lambda.annotations\0.4.2-preview\analyzers\dotnet\cs\Amazon.Lambda.Annotations.dll /analyzer:C:\Users\martin.costello\.nuget\packages\amazon.lambda.annotations\0.4.2-preview\analyzers\dotnet\cs\Newtonsoft.Json.dll /analyzer:"C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\6.0.1\analyzers/dotnet/cs/System.Text.Json.SourceGeneration.dll" MathsFunctions.cs obj\Debug\net6.0\LambdaAnnotations.GlobalUsings.g.cs "obj\Debug\net6.0\.NETCoreApp,Version=v6.0.AssemblyAttributes.cs" obj\Debug\net6.0\LambdaAnnotations.AssemblyInfo.cs /warnaserror+:NU1605
         Microsoft (R) Visual C# Compiler version 4.0.1-1.21569.2 (52021b4b)
         Copyright (C) Microsoft Corporation. All rights reserved.
   3:7>CSC : error AWSLambda0001: This is a bug. Please run the build with detailed verbosity (dotnet build --verbosity detailed) and file a bug at https://github.com/aws/aws-lambda-dotnet with the build output and stack trace Object reference not set to an instance of an object.   at Amazon.Lambda.Annotations.SourceGenerator.Models.TypeModelBuilder.Build(ITypeSymbol symbol, GeneratorExecutionContext context) [C:\Coding\martincostello\dotnet-lambda-annotations\src\LambdaAnnotations\LambdaAnnotations.csproj]
         at Amazon.Lambda.Annotations.SourceGenerator.Models.GeneratedMethodModelBuilder.BuildParameters(IMethodSymbol lambdaMethodSymbol, LambdaMethodModel lambdaMethodModel, GeneratorExecutionContext context)
         at Amazon.Lambda.Annotations.SourceGenerator.Models.GeneratedMethodModelBuilder.Build(IMethodSymbol lambdaMethodSymbol, IMethodSymbol configureMethodSymbol, LambdaMethodModel lambdaMethodModel, GeneratorExecutionContext context)
         at Amazon.Lambda.Annotations.SourceGenerator.Models.LambdaFunctionModelBuilder.Build(IMethodSymbol lambdaMethodSymbol, IMethodSymbol configureMethodSymbol, GeneratorExecutionContext context)
         at Amazon.Lambda.Annotations.SourceGenerator.Generator.Execute(GeneratorExecutionContext context).
         CompilerServer: server - server processed compilation - 6e7b7a37-afdb-4a25-9068-b53ca01c38f2
       Done executing task "Csc" -- FAILED.

Environment

• Build Version: Amazon.Lambda.Annotations 0.4.2-preview
• OS Info: Windows 10
• Build Environment: Visual Studio and the .NET SDK on the CLI
• Targeted .NET Platform: net6.0

Resolution

• 👋 I can/would-like-to implement a fix for this problem myself

---

This is a 🐛 bug-report

[slang25]

It looks like it expects the following package to be referenced:

<PackageReference Include="Amazon.Lambda.APIGatewayEvents" Version="2.4.0" />

Adding that to LambdaAnnotations.csproj fixes it for me.

[martincostello]

Give that man a 🍪.

[ashishdhingra]

Hi @slang25 / @martincostello,

Good morning.

Thanks for reporting the issue and the possible fix. Please advise if you would be able contribute fix in the form of a PR. For fix, we should instead add Project reference to aws-lambda-dotnet/Libraries/src/Amazon.Lambda.APIGatewayEvents/Amazon.Lambda.APIGatewayEvents.csproj in this repository.

Thanks,
Ashish

[martincostello]

@ashishdhingra I'll open a PR to address this as you've suggested 👍

[ganeshnj]

@martincostello this is by design, Amazon.Lambda.Annotations must not have any dependency on any lambda events package (ex. Amazon.Lambda.APIGatewayEvents) rather the user project take dependency on the Amazon.Lambda.Annotations & desired lambda event (in this case Amazon.Lambda.APIGatewayEvents).

Reason behind this, when user deploy their lambda function, lambda deployment package must only contain minimal set of dependencies, adding dependencies to Amazon.Lambda.Annotations will make deployment package larger and undesirable. If you have a Lambda function which doesn't have API Gateway event attached, the deployment package must not have API Gateway event assembly basically.

[martincostello]

Fair enough that the missing dependency is by design.

In that case, the source generator should tell you the reference is missing and guide you into the pit of success, not throw an exception caused by a NullReferenceException and tell you to log a bug here.

[ganeshnj]

100%, the error message you got, is for generic failure. This must be improved by checking that user code is using RestApi or HttpApi, they must add reference to Amazon.Lambda.APIGatewayEvents in order to compile.

[ashishdhingra]

This is a candidate for feature request to improve error messaging. Probably should also update Readme as well to mention that Annotations project should be kept light-weight.