Swashbuckle.AspNetCore: Potential problems with 6.3.0

Running a .net 6.0 C# Web API.

After upgrading Swashbuckle.AspNetCore from 6.2.3 to 6.3.0, the API will not start, and gives the following error message:

Swashbuckle.AspNetCore.SwaggerGen.SwaggerGeneratorException: Failed to generate Operation for action(ActionName) . See inner exception —> Swashbuckle.AspNetCore.SwaggerGen.SwaggerGeneratorException: Failed to generate schema for type(ActionType). See inner exception —> System.NullReferenceException: Object reference not set to an instance of an object. at Swashbuckle.AspNetCore.SwaggerGen.SchemaGenerator.GenerateSchemaForMember(Type modelType, SchemaRepository schemaRepository, MemberInfo memberInfo, DataProperty dataProperty) at Swashbuckle.AspNetCore.SwaggerGen.SchemaGenerator.CreateObjectSchema(DataContract dataContract, SchemaRepository schemaRepository) at Swashbuckle.AspNetCore.SwaggerGen.SchemaGenerator.<>c__DisplayClass10_0.<GenerateConcreteSchema>b__3() at Swashbuckle.AspNetCore.SwaggerGen.SchemaGenerator.GenerateReferencedSchema(DataContract dataContract, SchemaRepository schemaRepository, Func1 definitionFactory) at Swashbuckle.AspNetCore.SwaggerGen.SchemaGenerator.GenerateConcreteSchema(DataContract dataContract, SchemaRepository schemaRepository) at Swashbuckle.AspNetCore.SwaggerGen.SchemaGenerator.GenerateSchemaForMember(Type modelType, SchemaRepository schemaRepository, MemberInfo memberInfo, DataProperty dataProperty) at Swashbuckle.AspNetCore.SwaggerGen.SchemaGenerator.CreateObjectSchema(DataContract dataContract, SchemaRepository schemaRepository) at Swashbuckle.AspNetCore.SwaggerGen.SchemaGenerator.<>c__DisplayClass10_0.<GenerateConcreteSchema>b__3() at Swashbuckle.AspNetCore.SwaggerGen.SchemaGenerator.GenerateReferencedSchema(DataContract dataContract, SchemaRepository schemaRepository, Func1 definitionFactory) at Swashbuckle.AspNetCore.SwaggerGen.SchemaGenerator.GenerateConcreteSchema(DataContract dataContract, SchemaRepository schemaRepository) at Swashbuckle.AspNetCore.SwaggerGen.SchemaGenerator.GenerateSchemaForType(Type modelType, SchemaRepository schemaRepository) at Swashbuckle.AspNetCore.SwaggerGen.SchemaGenerator.GenerateSchema(Type modelType, SchemaRepository schemaRepository, MemberInfo memberInfo, ParameterInfo parameterInfo, ApiParameterRouteInfo routeInfo) at Swashbuckle.AspNetCore.SwaggerGen.SchemaGenerator.CreateArraySchema(DataContract dataContract, SchemaRepository schemaRepository) at Swashbuckle.AspNetCore.SwaggerGen.SchemaGenerator.<>c__DisplayClass10_0.<GenerateConcreteSchema>b__1() at Swashbuckle.AspNetCore.SwaggerGen.SchemaGenerator.GenerateConcreteSchema(DataContract dataContract, SchemaRepository schemaRepository) at Swashbuckle.AspNetCore.SwaggerGen.SchemaGenerator.GenerateSchemaForMember(Type modelType, SchemaRepository schemaRepository, MemberInfo memberInfo, DataProperty dataProperty) at Swashbuckle.AspNetCore.SwaggerGen.SchemaGenerator.CreateObjectSchema(DataContract dataContract, SchemaRepository schemaRepository) at Swashbuckle.AspNetCore.SwaggerGen.SchemaGenerator.<>c__DisplayClass10_0.<GenerateConcreteSchema>b__3() at Swashbuckle.AspNetCore.SwaggerGen.SchemaGenerator.GenerateReferencedSchema(DataContract dataContract, SchemaRepository schemaRepository, Func1 definitionFactory) at Swashbuckle.AspNetCore.SwaggerGen.SchemaGenerator.GenerateConcreteSchema(DataContract dataContract, SchemaRepository schemaRepository) at Swashbuckle.AspNetCore.SwaggerGen.SchemaGenerator.GenerateSchemaForType(Type modelType, SchemaRepository schemaRepository) at Swashbuckle.AspNetCore.SwaggerGen.SchemaGenerator.GenerateSchema(Type modelType, SchemaRepository schemaRepository, MemberInfo memberInfo, ParameterInfo parameterInfo, ApiParameterRouteInfo routeInfo) at Swashbuckle.AspNetCore.SwaggerGen.SwaggerGenerator.GenerateSchema(Type type, SchemaRepository schemaRepository, PropertyInfo propertyInfo, ParameterInfo parameterInfo, ApiParameterRouteInfo routeInfo) --- End of inner exception stack trace --- at Swashbuckle.AspNetCore.SwaggerGen.SwaggerGenerator.GenerateSchema(Type type, SchemaRepository schemaRepository, PropertyInfo propertyInfo, ParameterInfo parameterInfo, ApiParameterRouteInfo routeInfo) at Swashbuckle.AspNetCore.SwaggerGen.SwaggerGenerator.CreateResponseMediaType(ModelMetadata modelMetadata, SchemaRepository schemaRespository) at Swashbuckle.AspNetCore.SwaggerGen.SwaggerGenerator.<>c__DisplayClass19_0.<GenerateResponse>b__2(String contentType) at System.Linq.Enumerable.ToDictionary[TSource,TKey,TElement](IEnumerable1 source, Func2 keySelector, Func2 elementSelector, IEqualityComparer1 comparer) at System.Linq.Enumerable.ToDictionary[TSource,TKey,TElement](IEnumerable1 source, Func2 keySelector, Func2 elementSelector) at Swashbuckle.AspNetCore.SwaggerGen.SwaggerGenerator.GenerateResponse(ApiDescription apiDescription, SchemaRepository schemaRepository, String statusCode, ApiResponseType apiResponseType) at Swashbuckle.AspNetCore.SwaggerGen.SwaggerGenerator.GenerateResponses(ApiDescription apiDescription, SchemaRepository schemaRepository) at Swashbuckle.AspNetCore.SwaggerGen.SwaggerGenerator.GenerateOperation(ApiDescription apiDescription, SchemaRepository schemaRepository) — End of inner exception stack trace — at Swashbuckle.AspNetCore.SwaggerGen.SwaggerGenerator.GenerateOperation(ApiDescription apiDescription, SchemaRepository schemaRepository) at Swashbuckle.AspNetCore.SwaggerGen.SwaggerGenerator.GenerateOperations(IEnumerable1 apiDescriptions, SchemaRepository schemaRepository) at Swashbuckle.AspNetCore.SwaggerGen.SwaggerGenerator.GeneratePaths(IEnumerable1 apiDescriptions, SchemaRepository schemaRepository)a at Swashbuckle.AspNetCore.SwaggerGen.SwaggerGenerator.GetSwagger(String documentName, String host, String basePath) at Swashbuckle.AspNetCore.Swagger.SwaggerMiddleware.Invoke(HttpContext httpContext, ISwaggerProvider swaggerProvider)

by downgrading back to 6.2.3 it started working again.

I also have the Swashbuckle.AspNetCore.Newtonsoft installed - but any permutation of version 6.3.0 gives the same error message.

About this issue

Original URL
State: closed
Created 2 years ago
Reactions: 12
Comments: 20 (4 by maintainers)

Commits related to this issue

Fixes #2368 — committed to Eneuman/Swashbuckle.AspNetCore-1 by Eneuman 2 years ago
fix: revert swagger to 6.2.3 Issue: https://github.com/domaindrivendev/Swashbuckle.AspNetCore/issues/2368 — committed to ArneD/swagger by ArneD 2 years ago
fix: revert swagger to 6.2.3 Issue: https://github.com/domaindrivendev/Swashbuckle.AspNetCore/issues/2368 — committed to Informatievlaanderen/swagger by ArneD 2 years ago
revert to swashbuckle 6.2.3 and regen clients https://github.com/domaindrivendev/Swashbuckle.AspNetCore/issues/2368 — committed to microsoft/TeamCloud by colbylwilliams 2 years ago
Fix "Failed to load API definition" on v2 swagger Possible Problems with >6.3.0+ cause this issue. Reverting to working version as mentioned in https://github.com/domaindrivendev/Swashbuckle.AspNetCo... — committed to ShokoAnime/ShokoServer by krbrs 2 years ago
Up other packages Except swashbuckle due to unresolved issue https://github.com/domaindrivendev/Swashbuckle.AspNetCore/issues/2368 — committed to KevinRecuerda/RecShark by Gafs63 2 years ago
Migration to dotnet 6 (#60) * Upgrade csproj to target net6.0 * Up Microsoft.AspNetCore.* & Microsoft.Extensions.* * Up other packages Except swashbuckle due to unresolved issue https://g... — committed to KevinRecuerda/RecShark by Gafs63 2 years ago

Most upvoted comments

I am facing the same problem in v6.4.0.

+16

zendu on Jul 28, 2022

I’ll take a look at this right away and make a PR for it.

Eneuman on Mar 14, 2022

Hey, there is a blocker issue for most of the users and no solution? Any plans to fix it soon?

sergei-lobanov on Nov 8, 2022

A workaround is to compile your own version. @domaindrivendev can we address this issue next release please?

plutora-steve-g on Aug 16, 2022

Okay, can confirm, this is unrelated. I can confirm that the issue is due to the SignalRSwaggerGen package. It doesn’t play nice with the new Swashbuckle update. This is a red herring.

@KnightSwordAG It looks like that package is using a dictionary with known keys so this might be related to this. SignalRSwaggerGen.<>c__DisplayClass8_0.<ToOpenApiParameters>b__0

Eneuman on Mar 14, 2022

@domaindrivendev adding the link to the app which reproduces the issue. it is caused by builder.Services.AddSwaggerGenNewtonsoftSupport() (l:6) in Program.cs due to enum in CrashObject.cs

https://github.com/zsalkus/Swashbuckle.AspNetCore.CrashDemo

zsalkus on Mar 10, 2022

Facing the same issue after upgrading from Swashbuckle.AspNetCore 6.2.3 to version 6.3.0. Also using Newtonsoft.

6.2.3 works fine.

nielswitte on Mar 10, 2022