what is the right way to handle errors in spring-webflux

Question

I\'ve been doing some research using spring-webflux and I like to understand what should be the right way to handle errors using Router Functions.

I\'ve created an s

Answer 1

Why not do it the old fashioned way by throwing exceptions from handler functions and implementing your own WebExceptionHandler to catch 'em all:

@Component
class ExceptionHandler : WebExceptionHandler {
    override fun handle(exchange: ServerWebExchange?, ex: Throwable?): Mono {
        /* Handle different exceptions here */
        when(ex!!) {
            is NoSuchElementException -> exchange!!.response.statusCode = HttpStatus.NOT_FOUND
            is Exception -> exchange!!.response.statusCode = HttpStatus.INTERNAL_SERVER_ERROR
        }

        /* Do common thing like logging etc... */

        return Mono.empty()
    }
}

Above example is in Kotlin, since I just copy pasted it from a project I´m currently working on, and since the original question was not tagged for java anyway.