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ReactiveX / RxJava Public

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4.0

Open

Due by November 30, 2026

•Last updated Jun 26, 2026

RxJava 4.0 fully extended with Streamable operators, all cleanups done. Decided to run with 25, 26 or 27.

83% complete

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0 issues of 14 selected

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(14)
Closed
(72)

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

Status: Open.

#7971 In ReactiveX/RxJava;

· akarnokd opened

on Mar 16, 2026

Update wiki to reflect 4.x (tracking issue)

Status: Open.

#6132 In ReactiveX/RxJava;

· akarnokd opened

on Aug 3, 2018

4.x: Flowable missing or incorrect marbles (tracking issue)

Status: Open.

#5813 In ReactiveX/RxJava;

· akarnokd opened

on Jan 17, 2018

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

Status: Open.

#8054 In ReactiveX/RxJava;

· akarnokd opened

on Mar 25, 2026

3.x: recursive concat causes StackOverflowError

Status: Open.

#6958 In ReactiveX/RxJava;

· akarnokd opened

on Apr 11, 2020

GroupBy using only one group after some time

Status: Open.

#7544 In ReactiveX/RxJava;

· PiotrDuz opened

on Mar 21, 2023

Observable.create may call source callback with already disposed emitter

Status: Open.

#7862 In ReactiveX/RxJava;

· feerbach opened

on May 6, 2025

4.x: Separate `TestHelper.race` uses so they can run `@Isolated`

Status: Open.

#8075 In ReactiveX/RxJava;

· akarnokd opened

on Mar 25, 2026

`Flowable#groupBy` race leads to a back-pressure issue

Status: Open.

#7100 In ReactiveX/RxJava;

· bsideup opened

on Oct 20, 2020

3.x: parallel performs poorly with 10+ parallelism

Status: Open.

#6931 In ReactiveX/RxJava;

· akarnokd opened

on Mar 11, 2020

Feature Request: Add `Observable.usingWhen()` for resources generated by a `Publisher`

Feature-Request

Status: Open.

#7548 In ReactiveX/RxJava;

· KarboniteKream opened

on Mar 25, 2023

4.x: Convert JUnit 4 tests into JUnit 6 tests

Performance: throughput

Status: Open.

#8079 In ReactiveX/RxJava;

· akarnokd opened

on Mar 25, 2026

4.x: Java target version clarification

Status: Open.

#8089 In ReactiveX/RxJava;

· akarnokd opened

on Mar 30, 2026

4.x: Reduce API surface via introducing configuration records

Status: Open.

#8173 In ReactiveX/RxJava;

· akarnokd opened

on Jun 25, 2026

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