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Update changelogs from fern repo #593

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Aug 25, 2025
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Update changelogs from fern repo #593

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11 changes: 11 additions & 0 deletions fern/products/sdks/overview/java/changelog/2025-08-25.mdx
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## 2.42.0
**`(feat):`** Add support for semantic distinction between `nullable<T>` and `optional<T>` types via `use-nullable-annotation` flag.
When enabled, `nullable<T>` generates as raw type `T` with `@Nullable` annotation, while `optional<T>` remains as `Optional<T>`.
This provides proper API semantics for fields that can be null vs those that may be absent from requests.

```yaml
customConfig:
use-nullable-annotation: true
```