reactor/reactor-core v3.3.15.RELEASE

on GitHub

Reactor-Core 3.3.15.RELEASE is part of Dysprosium-SR18 Release Train.

This service release mainly contains bugfixes.

⚠️ Notable Known Issues

• Fusion of Mono.single() over most fuseable sources causes ClassCastException => tracked in #2663

✨ New features and improvements

• Work in progress for a future public abstraction: MonoInnerProducerBase
  • Introduce MonoInnerProducerBase (#2632)
  • Improve MonoProducerBase but remove fusion support from MonoSingle (#2645)

🪲 Bug fixes

• Fix Mono.publish(Function) not propagating onError (#2625)
• Fix flatMap race favoring onComplete over onError (#2628)
• Prevent ordered merge hanging due to badly sized queue (#2631)
• Fix a leak in Mono.singleOrEmpty thanks to MonoInnerProducerBase (#2632)
• ⚠️ Mono.fromSupplier(() -> null).single() previously failed to produce an onError(NoSuchElementException) (#2635)
  • instead it completed empty
  • in fact, any source Mono that was implementing Callable (which includes fromSupplier, fromCallable, fromRunnable to some extent...) would exhibit the wrong behavior
  • This is now fixed via #2648.
  • 🐛 known issue: the same bug is still manifesting in Flux#single, which is going to be fixed by #2657 in the next release

📖 Documentation, Tests and Build

• Extend RaceTestUtils to support N runnables (#2601)
• Add a RaceTestUtils.race variant with timeout parameter (#2627)
• Improve misleading javadoc of concatMapXxx prefetch parameter (#2614)
• Introduce jcstress in 3.3.x

👍 Thanks to the following contributors that also participated to this release

@martin-tarjanyi