Code Quality · JetBrains plugin
CompletableFuture Cancellation Propagation Companion
FreeConcurrency / Async Bugs
IntelliJ-family plugin that flags a .thenCompose(...) chain whose result future can be cancelled, but whose inner future: constructed directly inside the lambda: never receives that cancellation, so the orphaned work keeps running and consuming resources after the caller believes the whole operation stopped.
The gap it fixes
CompletableFuture.thenCompose never propagates cancellation into the stage it returns -- calling .cancel(true) on the outer/chained future only marks that future as cancelled; it does not touch the inner CompletableFuture the lambda constructed and is still waiting on. This is a real, repeatedly-reported gap: it shows up in GitHub issues against Reactor Core, Failsafe, and OpenTelemetry's Java instrumentation, each describing the same shape -- a caller cancels what it thinks is the whole async operation, but a supplyAsync/ runAsync stage buried inside a thenCompose lambda keeps exe
Facts and pricing
- Category
- Code Quality
- Pricing
- Free
- Platform
- IntelliJ-family
- First published
- 2026-09-02
- Marketplace ID
- #34016
- Repository
completablefuture-cancellation-companion- Growth
- New listing
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