Library used for nullable, etc. annotations

[zeroeightysix]

In FabricMC/fabric#499 the library used for the @Deprecated is being discussed. I'd like to use the same library for the @Nullable annotations (and variants).

Note IDEA currently provides the following warning for all usages of javax annotations:

Not 'javax.annotation.Nullable' but 'org.jetbrains.annotations.Nullable' would be used for code generation. 

This issue serves as a tracker until FabricMC/fabric#499 is solved.

[liach]

Should we use jetbrains or javax? javax annotations imo are not sustainable in long term as we might have things like nested nullable types

[zeroeightysix]

I prefer jetbrains annotations as well. Fiber currently uses javax solely because it's in the standard lib.

[liach]

With jetbrain annotations/other type annotations and some tweaks to

fiber/src/main/java/me/zeroeightsix/fiber/annotation/magic/TypeMagic.java

Line 34 in 9096f81

public final class TypeMagic {

, it will be able to handle the nullability of nested types properly

[Pyrofab]

I've been dying to use Jetbrains annotations everywhere in my PRs. With that said, would Fabric Loader accept a compile-time dependency on those ?

[liach]

Yep, but a problem with jetbrain annotations is that they are class-level retention (i.e. aren't exposed at runtime so config's type resolution cannot perform nullable checks unless using asm to grab those annotations)

[i509VCB]

Does checker preserve annotations into runtime?

[liach]

Does checker preserve annotations into runtime?

https://github.com/typetools/checker-framework/blob/6cf4e4f2cb829bb39a3bc33f3a11b547f3afe3dd/checker/src/main/java/org/checkerframework/checker/nullness/qual/Nullable.java#L27
It does

[Pyrofab]

I did not consider using nullness annotations for runtime checks. That is an excellent idea, it could use a new NonNullConstraint.

[ghost]

I'd vote for Jetbrains. The Javax annotations cause build problems when I'm using CurseGradle on Github Actions (and the error log leads to this project). I've had to manually add the Javax annotations as an implementation even though I personally use Jetbrains.

[dG9hc3Q]

Jetbrains ftw