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Spring WebFlux

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Spring WebFlux is Spring Framework's reactive web stack built on Project Reactor. Unlike traditional Spring MVC (blocking threads), WebFlux uses async streams to handle thousands of concurrent connections with minimal threads. Used for high-concurrency APIs, real-time applications, and microservices. Salary: $120-180k USD. Time to proficiency: 5-6 months with reactor experience. Related to java-concurrency, reactive-programming, and microservices-architecture.

Vad är Spring WebFlux

Spring WebFlux is Spring Framework's reactive web framework for building high-concurrency, non-blocking web applications. Unlike traditional Spring MVC (which allocates one thread per request), WebFlux uses async streams to handle thousands of concurrent connections with a small, fixed pool of threads. It's built on Project Reactor, which provides Mono and Flux abstractions for composing asynchronous operations. WebFlux is ideal for APIs with high concurrency (mobile apps, real-time applications, IoT), microservices, and systems where thread count is a bottleneck. Cloud-native and microservice architectures demand high-concurrency frameworks. Traditional blocking frameworks (Spring MVC) don't scale well beyond a few thousand requests; WebFlux scales to millions. Teams using WebFlux reduce server costs, improve latency, and handle traffic spikes gracefully. WebFlux engineers command competitive salaries ($150-220k USD senior) because they solve hard problems: concurrency, streaming, backpressure, and distributed systems. It's becoming the standard for modern Java backends.

🔧 VERKTYG & EKOSYSTEM
Spring WebFluxProject ReactorSpring BootWebClientRxJavaKotlin CoroutinesMongoDB ReactiveR2DBC

💰 Lön per region

OmrådeNybörjareMidErfaren
USA$100k$150k$220k
UK£65k£105k£150k
EU€70k€110k€160k
CANADAC$95kC$145kC$210k

❓ Vanliga frågor

Why use WebFlux instead of Spring MVC?
MVC uses thread-per-request; at 10k concurrent requests, you need 10k threads (expensive). WebFlux uses reactive streams; 10k requests on 20 threads. Use WebFlux for high-concurrency APIs; MVC is fine for typical web apps.
What's Project Reactor?
Project Reactor is the reactive library under WebFlux. It provides Mono (single value) and Flux (stream of values) for composing async operations. You work with Mono/Flux streams, not callbacks.
How do you connect a database reactively?
Use R2DBC (Reactive Relational Database Connectivity) drivers or native reactive drivers (MongoDB, Redis, Cassandra). Traditional JDBC is blocking; R2DBC is async. Some databases (PostgreSQL, MySQL) have R2DBC drivers; others don't yet.
Is WebFlux harder than MVC?
Yes, mentally. You shift from imperative (do this, then that) to reactive (compose streams). But WebFlux handles complexity under the hood; you gain performance and scalability in return.
Can you mix WebFlux and MVC in the same app?
Not recommended. Choose one model per app. WebFlux and MVC use different threading models; mixing them causes confusion and potential deadlocks. Build separate services if you need both.

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