RT0999 rears its head again for System.Text.Json 9.0.0.0

[Steve-OH]

See #206.

.NET 8.0

Reinforced.typings is apparently incompatible with System.Text.Json 9.0.0.0. It reports the following error:

RT0999  Could not load file or assembly 'System.Text.Json, Version=9.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. The system cannot find the file specified.

The referenced file does exist in the expected .nuget\packages location.

Reverting to System.Text.Json 8.0 fixes the problem, but is not a long term solution, since that version does not support .NET 9.

[smkanadl]

Have you upgraded to the latest 1.6.5 version? Because the older version simply do not support net9.0.

[Steve-OH]

@smkanadl Yes. In fact, the problem occurred when I upgraded to 1.6.5, because I was doing my periodic package maintenance and upgraded everything else at the same time.

Note that my build target is still .NET 8, so it's not a .NET 9 issue per se.

[smkanadl]

@Steve-OH

Note that my build target is still .NET 8, so it's not a .NET 9 issue per se.

I just checked and I also target net8.0 using the 1.6.5 version of the package and it works fine for me. I change a few things here and there but was not able to reproduce the issue. I also forced STJ to be 9.0.0 while targeting net8.0. That work fine for me.

The only way to break it was to update to net9.0 and force RT to use <RtForceTargetFramework>net8.0</RtForceTargetFramework>. That issued the error for me.

[Steve-OH]

@smkanadl I can't reproduce the problem in a fresh project, but likewise I can't get it to go away in my real project. I've commented out everything I can in the .csproj file, and it still happens. Of course, if I comment out something that breaks the build, then the error doesn't occur, since it never gets to the point where it can occur.

I will have to do some more experimentation to try to isolate the problem.

[smkanadl]

@Steve-OH If it is a public repo I can have a look, otherwise you have to experiment on your own.

[Steve-OH]

@smkanadl I was able to isolate the problem: If System.Text.Json 9.0.0 is a dependency, and if the JsonPolymorphic attribute is used, then the error is triggered. See https://github.com/Steve-OH/reinforced-typings-json-polymorphic for a test case.

If you make code changes, the error is not always triggered on a build, but it seems to always trigger on a rebuild of the solution.

[Steve-OH]

@smkanadl By the way, while fiddling with this I discovered that other 9.0.0 packages can also trigger the error (e.g., Microsoft.Extensions.Logging.Abstractions), although I didn't investigate exactly what causes the error with those.

[smkanadl]

@Steve-OH ah yes, that makes sense. If your net8.0 app is loaded into the net8.0 RT CLI but has a source-generator runtime dependency on net9.0, then the RT CLI would need assembly redirects which it (most likely) doesn't have.

Good thing that I usually never update dependencies on versions greater than the framework version. Otherwise I would have hit the issue also.