Handling reactive errors

As we have done before, any microservice needs to be built for failure, so when we create reactive microservices, we can handle any error gracefully. The Reactor Framework provides mechanisms that we need to understand to handle those errors. In this section, we learn how to use them to make our reactive microservice as good at handling errors as our non-reactive microservices.

Capturing errors on Handlers

When we create handlers, we may encounter errors, and those errors can be handled with one special method in any reactive publisher onErrorResume. Let's modify our create method in the CustomerHandler class to understand how it works:

package com.microservices.chapter4

import org.springframework.http.HttpStatus
import org.springframework.stereotype.Component
import org.springframework.web.reactive.function.BodyInserters.fromObject
import org.springframework.web.reactive.function.server.ServerRequest
import org.springframework.web.reactive.function.server.ServerResponse...