Understanding switchIfEmpty() in Spring Reactive

Date: 2024-10-24

This article explains Spring Reactive's switchIfEmpty operator, which provides a fallback publisher when a source publisher completes without emitting items. It leverages Spring's Flux and Mono for reactive stream handling. The article uses a Spring Boot example demonstrating switchIfEmpty with defer, creating a new publisher only when needed. This improves resource management and handles situations where data might be unavailable. The example includes an ItemService and ItemController showcasing the operator's use in a RESTful context.

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