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Micronaut Framework 5.0 drops support for RxJava 2

by Sergio Del Amo Caballero Tags:

Micronaut Framework 5.0, to be released in Q2 2026, drops support for RxJava 2. Micronaut 5 users have two reactive options: Project Reactor or RxJava 3.

Micronaut public APIs are reactive library–agnostic. However, internally, when a reactive library is required, we use Project Reactor.

If you want to migrate from RxJava 2 to RxJava 3, you need to replace the dependency io.micronaut.rxjava2:micronaut-rxjava2 with io.micronaut.rxjava3:micronaut-rxjava3, and update the following imports:

  • io.reactivex.Completable → io.reactivex.rxjava3.core.Completable
  • io.reactivex.Flowable → io.reactivex.rxjava3.core.Flowable
  • io.reactivex.Maybe → io.reactivex.rxjava3.core.Maybe
  • io.reactivex.Single → io.reactivex.rxjava3.core.Single