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.

Example:

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