v3.6.0

Reactor-Core 3.6.0 is part of 2023.0.0 Release Train.

This is the first GA release of 2023.0.0 🎉

This note focuses on 3.6.0 proper, curating changes from across all milestones and also includes changes already released as part of 3.4.x line up to 3.4.34 as well as 3.5.x line up to 3.5.12.

While there are plenty of improvements and bug fixes, it's worth to highlight the bigger themes first:

• The Schedulers.boundedElastic() may return a specific implementation tailored for Project Loom and running on virtual threads if application runs in Java 21+ runtime and have set the reactor.schedulers.defaultBoundedElasticOnVirtualThreads system property to true. Please consult the javadocs and the reference documentation for more information.
• Support for Multi-Release Jar. Since this release project has java version specific sources that are enabled if runs in specific Java runtime. This allows to avoid unnecessary reflection checks as well as embrace some new neat java features without changing the baseline for the whole code base.
• Hardening of the context-propagation. This release introduces better support for external Publishers detection with their corresponding decoration if detected. This enables more stable context-propagation when it comes to external libraries integration.

See dedicated pre-release blogpost for more information.

What's Changed

⚠️ Update considerations and deprecations

• Regression in Flux.create: addCap always returns value with flag by @OlegDokuka in #3610
• makes throwable assignment happens-before done assignment in onError for FluxPublish by @OlegDokuka in #3638

✨ New features and improvements

• Hardening automatic context propagation by @chemicL in #3549
• InternalOperator automatic context propagation by @chemicL in #3625
• adds support for gradle 8.1.1 by @OlegDokuka in #3521
• adds support for multi-release-jar | rework Traces by @OlegDokuka in #3523
• introduces automatic loom support by @OlegDokuka in #3524
• provides minimal troubleshooting for mrj by @OlegDokuka in #3532
• fix #3539 takeUntil Predicate test before emit by @AramMessdaghi9001 in #3544
• Reworks FluxPublish internals to relay on predictable state machine by @OlegDokuka in #3538
• dedicated loom oriented boundeElasticScheduler implementation by @OlegDokuka in #3566
• Handling 1.0.0 of context-propagation by @chemicL in #3609
• provides extra check for contextualName presence by @OlegDokuka in #3611
• JCStress: Await Scheduler dispose and increase timeouts by @chemicL in #3630

🐞 Bug fixes

• fixes MonoDelayElement to properly handle race between delay run and onNext signal by @OlegDokuka in #3546
• ensures GroupedFlux delivers subscription for the second subscriber by @OlegDokuka in #3555
• ensures late onRequest consumer observes demand by @OlegDokuka in #3557
• ensures that proper index is used during onNext check by @OlegDokuka in #3614
• ensures SchedulerTask uses isShutdown instead of isDisposed by @OlegDokuka in #3623

📖 Documentation, Tests and Build

• Fix return type for Mono.tap in javadoc by @ajax-surovskyi-y in #3564
• fixes CI.yml by @OlegDokuka in #3575
• adds CI nightly builds by @OlegDokuka in #3581
• disables temporarily java 21 tests by @OlegDokuka in #3590
• Bump actions/setup-java from 3.12.0 to 3.13.0 in /.github/workflows by @dependabot in #3585
• Bump actions/checkout from 3.1.0 to 4.1.0 in /.github/workflows by @dependabot in #3586
• Bump gradle/gradle-build-action from 2.7.0 to 2.9.0 in /.github/workflows by @dependabot in #3594
• improves build speed by @OlegDokuka in #3597
• Revised documentation about context propagation by @chemicL in #3617
• updates to java 21 GA temurin by @OlegDokuka in #3631
• Gradle 8.4 upgrade by @chemicL in #3632

🆙 Dependency Upgrades

• Bump gradle/wrapper-validation-action from 1.0.5 to 1.1.0 in /.github/workflows by @dependabot in #3542
• Bump com.gradle.enterprise from 3.12.4 to 3.14.1 by @dependabot in #3548
• Bump actions/setup-java from 3.6.0 to 3.12.0 in /.github/workflows by @dependabot in #3550
• Bump gradle/gradle-build-action from 2.3.3 to 2.7.0 in /.github/workflows by @dependabot in #3551
• Update Micrometer version to 1.10.10 by @violetagg in #3560
• upgrades to latest micrometer versions by @OlegDokuka in #3561
• Bump io.spring.nohttp from 0.0.10 to 0.0.11 by @dependabot in #3497
• Bump org.junit:junit-bom from 5.9.2 to 5.10.0 by @dependabot in #3556
• Bump me.champeau.gradle.japicmp from 0.4.1 to 0.4.2 by @dependabot in #3595
• Bump jmhVersion from 1.36 to 1.37 by @dependabot in #3596
• Bump byteBuddyVersion from 1.14.5 to 1.14.8 by @dependabot in #3601
• Bump com.gradle.enterprise from 3.14.1 to 3.15 by @dependabot in #3602
• Bump ch.qos.logback:logback-classic from 1.2.11 to 1.2.12 by @dependabot in #3476
• Bump de.undercouch.download from 5.4.0 to 5.5.0 by @dependabot in #3608
• Bump com.gradle.enterprise from 3.15 to 3.15.1 by @dependabot in #3613
• Update micrometer and micrometerTracing by @pderop in #3636
• Update micrometer, micrometerTracing, contextPropagation by @pderop in #3637

New Contributors

• @AramMessdaghi9001 made their first contribution in #3544
• @ajax-surovskyi-y made their first contribution in #3564

Full Changelog: v3.5.8...v3.6.0