4.0

List view

Update README to reflect recent changes and removals

4.x

Documentation

Status: Merged (completed).

ReactiveX/RxJavanumber 8265

#8265 In ReactiveX/RxJava;

· by akarnokd was closed on Aug 5, 2026

RxJava on JDK 21's virtual threads

4.x

Discussion

Status: Closed (completed).

Feature

#7763 In ReactiveX/RxJava;

· by abersnaze was closed on Mar 23, 2026

Create entropy-beauty-scan.yml

3.x

4.x

Build

Review-Welcome

Tools

Status: Merged (completed).

ReactiveX/RxJavanumber 7966

#7966 In ReactiveX/RxJava;

· by akarnokd was closed on Mar 15, 2026

4.x: Prefer Java Flow API to Reactive Streams

4.x

Status: Closed (completed).

#7967 In ReactiveX/RxJava;

· by msgilligan was closed on Mar 18, 2026

ThreadDeath is deprecated for removal in Java 20

4.x

Enhancement

Status: Closed (completed).

#7483 In ReactiveX/RxJava;

· by akarnokd was closed on Mar 18, 2026

4.x: Bootstrap

4.x

Build

Cleanup

Discussion

Documentation

Tools

Status: Closed (completed).

Task

#7968 In ReactiveX/RxJava;

· by akarnokd was closed on Mar 19, 2026

ℹ️ Official Discord Server ℹ️ https://dsc.gg/rxjava

4.x

Information

Status: Closed (completed).

Feature

#7971 In ReactiveX/RxJava;

· by akarnokd was closed on Jul 27, 2026

Fix 3rd party PR comment-back with entropy-beauty-scan.yml

3.x

4.x

Bug

Build

Status: Merged (completed).

ReactiveX/RxJavanumber 7973

#7973 In ReactiveX/RxJava;

· by akarnokd was closed on Mar 18, 2026

4.x: Add virtualCreate and virtualTransform to Flowable

4.x

Enhancement

Status: Merged (completed).

ReactiveX/RxJavanumber 8014

#8014 In ReactiveX/RxJava;

· by akarnokd was closed on Mar 19, 2026

4.x: Hide documentation in sealed interfaces [1/x]

4.x

Documentation

Enhancement

Status: Merged (completed).

ReactiveX/RxJavanumber 8028

#8028 In ReactiveX/RxJava;

· by akarnokd was closed on Mar 19, 2026

4.x: Introduce FlatMapConfig & remove some overload bloat

4.x

Cleanup

Enhancement

Status: Merged (completed).

ReactiveX/RxJavanumber 8031

#8031 In ReactiveX/RxJava;

· by akarnokd was closed on Mar 19, 2026

TCK can't run in parallel because of a Java common pool bug/feature

4.x

Shortcoming

Test

Test-Failures

Status: Closed (completed).

Task

#8036 In ReactiveX/RxJava;

· by akarnokd was closed on Mar 25, 2026

4.x: Introduce Streamable / Streamer after IAsyncEnumerable / IAsyncEnumreator

4.x

Enhancement

Status: Merged (completed).

ReactiveX/RxJavanumber 8048

#8048 In ReactiveX/RxJava;

· by akarnokd was closed on Mar 20, 2026

4.x: Improve Javadocs + limit line length + cleanup indentation + check

4.x

Build

Cleanup

Documentation

Status: Merged (completed).

ReactiveX/RxJavanumber 8050

#8050 In ReactiveX/RxJava;

· by akarnokd was closed on Mar 23, 2026

4.x: Intro Schedulers.virtual(), deprecate Schedulers.io(), fix tests

4.x

Enhancement

Status: Merged (completed).

ReactiveX/RxJavanumber 8051

#8051 In ReactiveX/RxJava;

· by akarnokd was closed on Mar 23, 2026

4.x: Javadoc self-check to use/expand upon {@inheritDoc}

4.x

Cleanup

Documentation

PR welcome

Status: Not planned (skipped).

Task

#8054 In ReactiveX/RxJava;

· by akarnokd was closed on Jun 30, 2026

Update gradle_release.yml, limit write capabilities of tools

4.x

Build

Status: Merged (completed).

ReactiveX/RxJavanumber 8056

#8056 In ReactiveX/RxJava;

· by akarnokd was closed on Mar 25, 2026

Fix gradle_snapshot.yml - need to checkout/gradle at push too

4.x

Build

Status: Merged (completed).

ReactiveX/RxJavanumber 8059

#8059 In ReactiveX/RxJava;

· by akarnokd was closed on Mar 25, 2026

gradle_snapshot.yml run build -> prerelease sequentially

4.x

Build

Status: Merged (completed).

ReactiveX/RxJavanumber 8062

#8062 In ReactiveX/RxJava;

· by akarnokd was closed on Mar 25, 2026

Cache things with entropy-beauty-scan.yml

4.x

Build

Status: Merged (completed).

ReactiveX/RxJavanumber 8064

#8064 In ReactiveX/RxJava;

· by akarnokd was closed on Mar 25, 2026

4.x: Report back test failures in a readable manner for PRs/Snaps

4.x

Build

Cleanup

Test

Test-Failures

Status: Merged (completed).

ReactiveX/RxJavanumber 8066

#8066 In ReactiveX/RxJava;

· by akarnokd was closed on Mar 25, 2026

4.x: Try to fix parallel testng failures

4.x

Build

Test

Test-Failures

Status: Merged (completed).

ReactiveX/RxJavanumber 8067

#8067 In ReactiveX/RxJava;

· by akarnokd was closed on Mar 25, 2026

3.x: recursive concat causes StackOverflowError

4.x

Investigating

Status: Not planned (skipped).

Bug

#6958 In ReactiveX/RxJava;

· by akarnokd was closed on Jul 27, 2026

GroupBy using only one group after some time

4.x

Investigating

Shortcoming

Status: Not planned (skipped).

Bug

#7544 In ReactiveX/RxJava;

· by PiotrDuz was closed on Jul 27, 2026

Observable.create may call source callback with already disposed emitter

4.x

Investigating

Status: Closed (completed).

Feature

#7862 In ReactiveX/RxJava;

· by feerbach was closed on Jun 28, 2026