title: Spring Boot auto-configured Jackson ObjectMapper not used for WebFlux WebClient by default
body: <p>In my Spring Boot application I'm making use of the reactive WebFlux WebClient to retrieve streaming JSON data from an SSE (Server-Sent Events) endpoint. Modifying the default auto-configured Jackson ObjectMapper behavior by setting config options in Spring Boot like <code>spring.jackson.deserialization.read-date-timestamps-as-nanoseconds=false</code> as suggested by the <a href="https://docs.spring.io/spring-boot/docs/current/reference/html/howto.html#howto-customize-the-jackson-objectmapper" rel="nofollow noreferrer">official docs</a> has no effect on the WebFlux WebClient. I also tried other suggestions outlined in this <a href="https://stackoverflow.com/questions/43195987/configured-objectmapper-not-used-in-spring-boot-webflux/43241547">SO thread</a> like creating custom beans for WebFlux configuration but they did not help, the config is still not being picked up.</p>