Zip contains parameter with Mono<Void> type

Reports zip operations that contains arguments with Mono<Void> return value inside a Reactor chain.

Zip completes empty as soon as incoming Mono<Void> completes. The quick-fix suggests replacing zip() and zipWhen() and zipWith() with when.

Locating this inspection

By ID

Can be used to locate inspection in e.g. Qodana configuration files, where you can quickly enable or disable it, or adjust its settings.

ReactorZipWithMonoVoid

Via Settings dialog

Path to the inspection settings via IntelliJ Platform IDE Settings dialog, when you need to adjust inspection settings directly from your IDE.

Settings or Preferences | Editor | Inspections | Reactive Streams | Reactor

Example:

Mono.zip(Mono.just(1), Mono.fromRunnable(() -> System.out.println("value")))
                .map(v -> "New value")
                .doFinally(System.out::println);

After the quick-fix is applied:

Mono.when(Mono.just(1), Mono.fromRunnable(() -> System.out.println("value")))
                .then(Mono.fromCallable(() -> "New value"))
                .doFinally(System.out::println);

New in 2023.1

Inspection Details
By default bundled with:	IntelliJ IDEA 2024.3, Qodana for JVM 2024.3,
Can be installed with plugin:	Reactive Streams, 243.26483

01 April 2025