junhyeong9812
d3d8e05fa9
The Mutiny Uni adapter registers its empty-value supplier as Uni.createFrom().nothing(), which returns a Uni that never signals an item, a failure, or completion. Every sibling registration supplies an empty value that completes immediately: Mono.empty(), Maybe.empty(), Completable.complete(), and CompletableDeferred(null); the Multi registration uses Multi.createFrom().empty() as well. ReactiveAdapter.toPublisher(null) substitutes that empty value whenever a null source needs to be adapted, for example when a WebFlux handler method with a Uni return type returns null. With a never-completing empty value the resulting Publisher emits no signal at all, so the response is never written and the request hangs until a timeout, whereas the same handler declared with Mono completes empty. The adapter also becomes asymmetric with its own fromPublisher function, which adapts an empty Publisher to a Uni that completes with a null item. The supplier now uses Uni.createFrom().nullItem(), whose conversion to a Publisher completes without emitting an item, matching the sibling adapters and the round-trip through fromPublisher. The descriptor is shared by the Mutiny 1 and Mutiny 2 registrations, so both paths are covered. Signed-off-by: junhyeong9812 <pickjog@gmail.com>
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