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I'm using Spring web-flux with Reactor and for me is not clear when RestController method should return
Mono <List<Object>> and when Flux<Object>.
Could you provide some case when to use each of them?
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Mono is more relatable to the Optional class in Java since it contains 0 or 1 value, and Flux is more relatable to List since it can have N number of values.
Project Reactor is the implementation of Reactive Streams specification. Reactor provides two types: Mono: implements Publisher and returns 0 or 1 elements. Flux: implements Publisher and returns N elements.
Convert Mono to Flux in Java To create a Flux from Mono, you can use the overloaded method from(), which accepts a Publisher as an argument.
Flux<Object> indicates that new Object instances can be pushed in a reactive way at any point. With Mono<List<Object>>, you will get 1 time a value that is a list of objects, but that list will never change.
See also Mono vs Flux in Reactive Stream
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