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[ci skip] Add section on nullability annotations (#11461)

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Nassim Jahnke 2024-10-02 14:32:20 +02:00 committed by GitHub
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@ -249,6 +249,17 @@ instead of adding a new import to the top of the file. If you are using a type a
can add an import with a comment. However, if its only used a couple of times, the FQN is preferred to prevent future
patch conflicts in the import section of the file.
### Nullability annotations
We are in the process of switching nullability annotation libraries, so you might need to use one or the other:
**For classes we add**: Fields, method parameters and return types that are nullable should be marked via the
`@Nullable` annotation from `org.jspecify.annotations`. Whenever you create a new class, add `@NullMarked`, meaning types
are assumed to be non-null by default. For less obvious placing such as on generics or arrays, see the [JSpecify docs](https://jspecify.dev/docs/user-guide/).
**For classes added by upstream**: Keep using both `@Nullable` and `@NotNull` from `org.jetbrains.annotations`. These
will be replaced later.
```java
import org.bukkit.event.Event;
// don't add import here, use FQN like below