Spring Boot Spring Boot WebFlux and Reactive Programming 2

Question 1

In Spring WebFlux, what is the role of the `ServerRequest` object in a `HandlerFunction`?

Accepted Answer

It encapsulates the HTTP request including headers, body, and path variables

Answer

It represents the reactive data source

Answer

It is used to configure route predicates

Answer

It wraps the underlying Netty channel

Question 2

Which operator would you use on a `Flux` to transform each element asynchronously using another reactive publisher?

Accepted Answer

flatMap

Answer

map

Answer

filter

Answer

reduce

Question 3

How do you enable reactive repository support for MongoDB in Spring Boot?

Accepted Answer

Add spring-boot-starter-data-mongodb-reactive

Answer

Add spring-boot-starter-mongodb and set reactive=true

Answer

Annotate the main class with @EnableReactiveMongo

Answer

Use MongoTemplate with async=true in application.properties

Question 4

What is backpressure in the context of reactive streams?

Accepted Answer

A signal from subscriber to publisher to slow down data emission

Answer

A mechanism to pause and resume the event loop

Answer

A cache strategy to buffer reactive events

Answer

A retry policy for failed reactive sequences

Question 5

Which WebFlux annotation marks a class as a reactive REST controller that returns reactive types?

Accepted Answer

@RestController

Answer

@ReactiveController

Answer

@WebFluxController

Answer

@NonBlockingController

Question 6

What property in `application.properties` switches the Spring Boot web application type to reactive?

Accepted Answer

spring.main.web-application-type=reactive

Answer

spring.web.type=reactive

Answer

spring.boot.reactive=true

Answer

server.reactive.enabled=true