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@dependabot dependabot bot commented on behalf of github Nov 10, 2025

Bumps io.projectreactor:reactor-core from 3.7.12 to 3.8.0.

Release notes

Sourced from io.projectreactor:reactor-core's releases.

v3.8.0

Reactor Core 3.8.0 is part of 2025.0.0 Release Train.

3.8.0 Highlights

Enhanced Null Safety using JSpecify

🦺 Reactor Core 3.8.0 introduces JSpecify annotations for comprehensive null safety, replacing the legacy JSR 305-based annotations with a modern, properly specified standard that prevents NullPointerExceptions through build-time checks. This upgrade provides enhanced IDE support, seamless Kotlin integration with automatic translation to Kotlin's null safety system, and more precise nullability declarations including support for arrays, varargs, and generic types — making Reactor APIs safer and more developer-friendly across the entire ecosystem.

⚠️ Nullability annotations from reactor.util.annotation have been deprecated in favour of JSpecify annotations.

📖 Check the refreshed reference documentation section on Null Safety.

⚠️ Note for Kotlin users: While this change is backwards compatible in the Java ecosystem and does not dictate a new generation of Reactor Core, we do appreciate it can appear as breaking changes for Kotlin codebases. The benefits are well defined nullness of the Reactor API and reduction of the ceremony that was required prior to the introduction of JSpecify annotations.

Repeat Spec

Repeat functionality from Reactor Addons has been ported to Reactor Core under the RepeatSpec class and can be used in conjunction with the Flux#repeatWhen() and Mono#repeatWhen() operators. Make sure to check out the Javadoc.

Reactor Core Micrometer version aligned with Reactor Core version

The reactor-core-micrometer library, which is part of the reactor-core repository is always released together with reactor-core, hence we decided to align their versions starting from 3.8.0 (the previous line was 1.2.x corresponding with 3.7.x of reactor-core).

What's Changed

⚠️ Update considerations and deprecations

✨ New features and improvements

🐞 Bug fixes

📖 Documentation

New Contributors

... (truncated)

Commits
  • fedfdd2 [release] Prepare and release 3.8.0
  • fe9d705 [docs] Add Null Safety documentation (#4137)
  • 56c2a33 Merge-ignore release 3.7.13 into 3.8.0
  • 4ab91b1 [release] Next development version 3.7.14-SNAPSHOT
  • dbbb82f [release] Prepare and release 3.7.13
  • f96f1d4 Unify reactor-core-micrometer version with reactor-core (#4136)
  • 68c5e2c Merge #4129 into 3.8.0
  • f4a8e99 Bump ruby/setup-ruby from 1.263.0 to 1.267.0 in /.github/workflows (#4129)
  • c7c3b4e Merge #4120 into 3.8.0
  • 135bcb1 Bump io.projectreactor.tools:blockhound from 1.0.14.RELEASE to 1.0.15.RELEASE...
  • Additional commits viewable in compare view

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Bumps [io.projectreactor:reactor-core](https://github.com/reactor/reactor-core) from 3.7.12 to 3.8.0.
- [Release notes](https://github.com/reactor/reactor-core/releases)
- [Commits](reactor/reactor-core@v3.7.12...v3.8.0)

---
updated-dependencies:
- dependency-name: io.projectreactor:reactor-core
  dependency-version: 3.8.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
@dependabot dependabot bot added this to the 4.0.x milestone Nov 10, 2025
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