kiota CSharp generation for yaml fails with error generating the client: Invalid URI: The URI is empty.

[AndrewZenith]

Outcome.txt

Having trouble generating some CSharp Code from the attached YAML file:

Tue 12 11 2024 10:22:26: Executing:
Tue 12 11 2024 10:22:26: kiota --version
Tue 12 11 2024 10:22:26: 1.20.0+81bdb1bf13383a749f794d47926d09733d2d7be1
Tue 12 11 2024 10:22:26: Executing:
Tue 12 11 2024 10:22:26: kiota generate -l CSharp -d "D:\projects\MyCustoms\webapi\REST\HMRC\SAS\Declaration\Declaration.yaml" -o "C:\Users\andre\AppData\Local\Temp\f8f80e7e-3b13-4280-be2c-15a774ad674e" -n webapi.REST.HMRC.SAS.Declaration --type-access-modifier Public
Tue 12 11 2024 10:22:26:
Tue 12 11 2024 10:22:26: crit: Kiota.Builder.KiotaBuilder[0]
Tue 12 11 2024 10:22:26: error generating the client: Invalid URI: The URI is empty.
Tue 12 11 2024 10:22:26:
Tue 12 11 2024 10:22:26: Rapicgen.Core.Generators.ProcessLaunchException: kiota failed!
Output:
crit: Kiota.Builder.KiotaBuilder[0]
error generating the client: Invalid URI: The URI is empty.

Error:

at Rapicgen.Core.Generators.ProcessLauncher.StartInternal(String command, String arguments, Action1 onOutputData, Action1 onErrorData, String workingDirectory) in D:\a\apiclientcodegen\apiclientcodegen\src\Core\ApiClientCodeGen.Core\Generators\ProcessLauncher.cs:line 107
at Rapicgen.Core.Generators.ProcessLauncher.Start(String command, String arguments, Action1 onOutputData, Action1 onErrorData, String workingDirectory) in D:\a\apiclientcodegen\apiclientcodegen\src\Core\ApiClientCodeGen.Core\Generators\ProcessLauncher.cs:line 74
at Rapicgen.Core.Generators.ProcessLauncher.Start(String command, String arguments, String workingDirectory) in D:\a\apiclientcodegen\apiclientcodegen\src\Core\ApiClientCodeGen.Core\Generators\ProcessLauncher.cs:line 33
at Rapicgen.Core.Generators.Kiota.KiotaCodeGenerator.RunKiotaGenerate(String outputFolder) in D:\a\apiclientcodegen\apiclientcodegen\src\Core\ApiClientCodeGen.Core\Generators\Kiota\KiotaCodeGenerator.cs:line 104
at Rapicgen.Core.Generators.Kiota.KiotaCodeGenerator.GenerateCode(IProgressReporter pGenerateProgress) in D:\a\apiclientcodegen\apiclientcodegen\src\Core\ApiClientCodeGen.Core\Generators\Kiota\KiotaCodeGenerator.cs:line 48
at Rapicgen.CustomTool.SingleFileCodeGenerator.Generate(String wszInputFilePath, String bstrInputFileContents, String wszDefaultNamespace, IntPtr[] rgbOutputFileContents, UInt32& pcbOutput, IVsGeneratorProgress pGenerateProgress)
Tue 12 11 2024 10:22:26: Rapicgen.Core.Generators.ProcessLaunchException: kiota failed!
Output:
crit: Kiota.Builder.KiotaBuilder[0]
error generating the client: Invalid URI: The URI is empty.

Error:

at Rapicgen.Core.Generators.ProcessLauncher.StartInternal(String command, String arguments, Action1 onOutputData, Action1 onErrorData, String workingDirectory) in D:\a\apiclientcodegen\apiclientcodegen\src\Core\ApiClientCodeGen.Core\Generators\ProcessLauncher.cs:line 107
at Rapicgen.Core.Generators.ProcessLauncher.Start(String command, String arguments, Action1 onOutputData, Action1 onErrorData, String workingDirectory) in D:\a\apiclientcodegen\apiclientcodegen\src\Core\ApiClientCodeGen.Core\Generators\ProcessLauncher.cs:line 74
at Rapicgen.Core.Generators.ProcessLauncher.Start(String command, String arguments, String workingDirectory) in D:\a\apiclientcodegen\apiclientcodegen\src\Core\ApiClientCodeGen.Core\Generators\ProcessLauncher.cs:line 33
at Rapicgen.Core.Generators.Kiota.KiotaCodeGenerator.RunKiotaGenerate(String outputFolder) in D:\a\apiclientcodegen\apiclientcodegen\src\Core\ApiClientCodeGen.Core\Generators\Kiota\KiotaCodeGenerator.cs:line 104
at Rapicgen.Core.Generators.Kiota.KiotaCodeGenerator.GenerateCode(IProgressReporter pGenerateProgress) in D:\a\apiclientcodegen\apiclientcodegen\src\Core\ApiClientCodeGen.Core\Generators\Kiota\KiotaCodeGenerator.cs:line 48
at Rapicgen.CustomTool.SingleFileCodeGenerator.Generate(String wszInputFilePath, String bstrInputFileContents, String wszDefaultNamespace, IntPtr[] rgbOutputFileContents, UInt32& pcbOutput, IVsGeneratorProgress pGenerateProgress)
Tue 12 11 2024 10:22:26: Unable to generate code

[andrueastman]

Thanks for raising this @AndrewZenith

Taking a look at your input description, it looks like you have a number of XML objects. These objects look to have empty strings for the namespace property which the OpenApi.NET library does not seem to expect to empty(and seems to be invalid according to the spec as it must be an absolute url).

• https://github.com/microsoft/OpenAPI.NET/blob/863faee69f553623ebbfb0c62ad2dc0dce9fba5f/src/Microsoft.OpenApi/Reader/V31/OpenApiXmlDeserializer.cs#L28
• https://github.com/microsoft/OpenAPI.NET/blob/863faee69f553623ebbfb0c62ad2dc0dce9fba5f/src/Microsoft.OpenApi/Models/OpenApiXml.cs#L22

xml:
    name: DocNumHEA5
    namespace: ""
    attribute: false
    wrapped: false

Any chance you can try removing the properties/entries of namespace: "" in your document to validate if the document is generated? I would also suggest creating an issue at https://github.com/microsoft/OpenAPI.NET/issues so that the error information from the library can be better in this scenario.