This document discusses the new features of Spring Framework 5.0 including fully reactive web functionality through WebFlux, native Kotlin extensions, JDK 9 support, and integration with Java EE 8 APIs. It introduces Project Reactor and how it allows non-blocking and asynchronous code. It compares the traditional Spring MVC servlet stack to the new reactive stack in Spring WebFlux. It also briefly discusses functional programming models in Kotlin and Spring MVC.

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© 2017 Pivotal
Getting Reactive with
Spring Framework 5.0’s GA release
Juergen Hoeller
Arjen Poutsma
Rossen Stoyachev
Stephane Maldini
Pieter Humphrey

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Spring Framework 5.0!
! A fully reactive web framework via WebFlux
! Native Kotlin extensions
! Comprehensive JDK 9, extending Java 8 language & API usage
! Integration with popular Java EE 8 APIs
! JUnit 5.0 and many further refinements

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Project Reactor

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Synchronous APIs Non-blocking code
100s, 1000s
waiting blocked threads
~ per CPU core
busy worker threads
“parallel”
thread pool
“elastic”
thread pool

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Servlet Stack
! Servlet Container
! Servlet API
! Spring MVC
Reactive Stack
! Netty, Servlet 3.1+, Undertow
! Reactive Streams
! Spring WebFlux

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Functional Programming Model

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Functional Programming Model - Kotlin

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How should Spring MVC think about this?

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Looking ahead

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