Abp: 4.0.0-rc.1 api host startup fails

[hikalkan]

• Create a new project with abp new Acme.BookStore -u blazor --preview
• Run database migrations (delete the old database if exists)
• Run HttpApi.Host

````
System.NullReferenceException: Object reference not set to an instance of an object.

at System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1.ConfiguredTaskAwaiter.get_IsCompleted()

at Microsoft.AspNetCore.RequestLocalization.DefaultAbpRequestLocalizationOptionsProvider.GetLocalizationOptionsAsync()

at Microsoft.AspNetCore.RequestLocalization.AbpRequestLocalizationMiddleware.InvokeAsync(HttpContext context, RequestDelegate next)

at Microsoft.AspNetCore.Builder.UseMiddlewareExtensions.<>c__DisplayClass6_1.<b__1>d.MoveNext()

--- End of stack trace from previous location ---

at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)
````

[hikalkan]

Same for an MVC project too.

[maliming]

I get an error when I use Rider run Api.Host, but everything is working when I debug Api.Host.

---

Problem code line is:

https://github.com/abpframework/abp/blob/c9ce1809c61abc48029913bb05b798ee67a7d395/framework/src/Volo.Abp.AspNetCore/Microsoft/AspNetCore/RequestLocalization/DefaultAbpRequestLocalizationOptionsProvider.cs#L50

Temporary patch: Copy MyDefaultAbpRequestLocalizationOptionsProvider to your project

[Dependency(ReplaceServices = true)]
public class MyDefaultAbpRequestLocalizationOptionsProvider : IAbpRequestLocalizationOptionsProvider, ISingletonDependency
{
      private readonly IServiceScopeFactory _serviceProviderFactory;
      private readonly SemaphoreSlim _syncSemaphore;
      private Action<RequestLocalizationOptions> _optionsAction;
      private RequestLocalizationOptions _requestLocalizationOptions;

      public MyDefaultAbpRequestLocalizationOptionsProvider(IServiceScopeFactory serviceProviderFactory)
      {
            _serviceProviderFactory = serviceProviderFactory;
            _syncSemaphore = new SemaphoreSlim(1, 1);
      }

      public void InitLocalizationOptions(Action<RequestLocalizationOptions> optionsAction = null)
      {
            _optionsAction = optionsAction;
      }

      public RequestLocalizationOptions GetLocalizationOptions()
      {
            if (_requestLocalizationOptions != null)
            {
                  return _requestLocalizationOptions;
            }

            return AsyncHelper.RunSync(GetLocalizationOptionsAsync);
      }

      public async Task<RequestLocalizationOptions> GetLocalizationOptionsAsync()
      {
            if (_requestLocalizationOptions == null)
            {
                  using (await _syncSemaphore.LockAsync())
                  {
                        if (_requestLocalizationOptions == null)
                        {
                              using (var serviceScope = _serviceProviderFactory.CreateScope())
                              {
                                    var languageProvider = serviceScope.ServiceProvider.GetRequiredService<ILanguageProvider>();
                                    var settingProvider = serviceScope.ServiceProvider.GetRequiredService<ISettingProvider>();

                                    var languages = await languageProvider.GetLanguagesAsync();
                                    var defaultLanguage = await settingProvider.GetOrNullAsync(LocalizationSettingNames.DefaultLanguage);

                                    var options = !languages.Any()
                                          ? new RequestLocalizationOptions()
                                          : new RequestLocalizationOptions
                                          {
                                                DefaultRequestCulture = DefaultGetRequestCulture(defaultLanguage, languages),

                                                SupportedCultures = languages
                                                      .Select(l => l.CultureName)
                                                      .Distinct()
                                                      .Select(c => new CultureInfo(c))
                                                      .ToArray(),

                                                SupportedUICultures = languages
                                                      .Select(l => l.UiCultureName)
                                                      .Distinct()
                                                      .Select(c => new CultureInfo(c))
                                                      .ToArray()
                                          };

                                    _optionsAction?.Invoke(options);
                                    _requestLocalizationOptions = options;
                              }
                        }
                  }
            }

            return _requestLocalizationOptions;
      }

      private static RequestCulture DefaultGetRequestCulture(string defaultLanguage, IReadOnlyList<LanguageInfo> languages)
      {
            if (defaultLanguage == null)
            {
                  var firstLanguage = languages.First();
                  return new RequestCulture(firstLanguage.CultureName, firstLanguage.UiCultureName);
            }

            var (cultureName, uiCultureName) = LocalizationSettingHelper.ParseLanguageSetting(defaultLanguage);
            return new RequestCulture(cultureName, uiCultureName);
      }
}

[274188A]

+1 - except I cannot get past the above mentioned error. i'm using:

Abp new [myproj] --ui blazor --preview

when you say "update the CLI" - what version of the CLI is the latest/best to use with 4.0.0-rc.1?

I tried to update the CLI with:

dotnet tool update -g Volo.Abp.Cli

which gives me

Tool 'volo.abp.cli' was reinstalled with the latest stable version (version '3.3.1').

[maliming]

@274188A

dotnet tool uninstall --global Volo.Abp.Cli 
dotnet tool install --global Volo.Abp.Cli --version 4.0.0-rc.1

[maliming]

@274188A https://github.com/abpframework/abp/issues/6180#issuecomment-726442950

I will investigate this.

[274188A]

Temporary patch: Copy MyDefaultAbpRequestLocalizationOptionsProvider to your project

Could you be more specific with the description "your project" - ie which project?
thanks (i'm assuming you mean the host but assumptions can be dangerous :-)

[maliming]

Could you be more specific with the description "your project" - ie which project?

XXX.HttpApi.Host

[maliming]

We need to republish all packages to resolve.

[OldKing-lion]

ok wait the stable version