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Return null or something nullable from a lambda in transformation method

Reports transform operations that may return null inside a Reactive Stream chain.

Reactive Streams don't support nullable values, which causes such code to fail. The quick-fix suggests replacing map() with mapNotNull, which omits exceptions.


repository.findWithTailableCursorBy() .map(e -> (Person)null) .doOnNext(System.out::println)

After the quick-fix is applied:

repository.findWithTailableCursorBy() .mapNotNull(e -> (Person)null) .doOnNext(System.out::println)

New in 2019.3

Inspection Details

By default bundled with:

IntelliJ IDEA 2024.1, Qodana for JVM 2024.1,

Can be installed with plugin:

Reactive Streams, 241.16690

Last modified: 29 April 2024