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Showing content from https://github.com/ReactiveX/RxJava/releases/tag/v3.0.0-RC2 below:

Release 3.0.0-RC2 · ReactiveX/RxJava · GitHub

Version 3.0.0-RC2 - August 20, 2019 (Maven)

Javadocs

This is an early release for 3.0.0 to allow preparations for the breaking API changes and cleanups.

Please check out the wiki page What's different in 3.0 from time to time for the details and migration guide.

Major change

After considering several factors, the components of RxJava 3 have been moved to a new base package to avoid class file conflicts due to having v2 and v3 in the same project. The new base package is io.reactivex.rxjava3 and the base types will live in io.reactivex.rxjava3.core:

Name v2 v3 Base package io.reactivex io.reactivex.rxjava3 Flowable io.reactivex.Flowable io.reactivex.rxjava3.core.Flowable PublishSubject io.reactivex.subjects.PublishSubject io.reactivex.rxjava3.subjects.PublishSubject ConnectableObservable io.reactivex.observables.ConnectableObservable io.reactivex.rxjava3.observables.ConnectableObservable Function io.reactivex.functions.Function io.reactivex.rxjava3.functions.Function etc.

Flowables of the two versions can talk to each other without bridges because both implement the Reactive Streams' interfaces such as Publisher:

io.reactivex.Flowable.range(1, 10)
    .flatMap(v -> io.reactivex.rxjava3.core.Flowable.just(v * 10))
    .subscribeWith(new io.reactivex.rxjava3.subscribers.TestSubscriber<>())
    .assertResult(10, 20, 30, 40, 50, 60, 70, 80, 90, 100);

The other reactive types do not share such base interfaces (they have their own respective copies) and will require bridges, likely provided via 3rd party libraries as with v1->v2 or v1->v3 bridges.

Dependency changes

Upgrade to Reactive Streams 1.0.3-RC1 (#6621)

API changes

Widen throws on the XOnSubscribe interfaces (#6579)

Behavior changes

Constrain upstream requests of elementAt and first operators (#6620)

Bugfixes

Fix switchMaps inconsistency swallowing errors when cancelled (#6572)
Fix ObservableBlockingSubscribe compares TERMINATED with wrong object (#6577)
Fix truncation bugs in replay() and ReplaySubject/Processor (#6582)
Fix mergeWith not cancelling the other source if the main errors (#6598)
Fix refCount not resetting when termination triggers cross-cancel (#6609)
Fix many operators swallowing undeliverable exceptions (#6612)
Fix switchMap incorrect sync-fusion & error management (#6616)

Documentation enhancements

No changes in this release.

Other

Create a base test class and have all unit tests extend it (#6589, #6594, #6595, #6600, #6604, #6607)
Refactor to io.reactivex.rxjava3.** (#6621)

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