Spring framework 5: New Core and Reactive features
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Spring Framework 5 introduces major updates to support reactive programming and non-blocking architectures. It fully supports Java 8 and 9 features and provides both annotation-based and functional programming styles. New additions include support for HTTP/2, reactive streams with Project Reactor, and functional Kotlin extensions. These changes help address challenges of blocking IO and improve latency, resource utilization, and code imperativity for reactive applications.
Spring framework 5: New Core and Reactive features
- 1. SPRING FRAMEWORK 5 Aliaksei Zhynhiarouski Ciklum, 3.2017
- 2. AGENDA TIME TO LEARN MORE ▸ What awaits us with Spring 5? ▸ “Enterprise” challenges and Reactive changes ▸ Coding!
- 3. HISTORY Started at 2002 by Rod Johnson & Juergen Hoeller Company behind: Interface21, SpringSource, Pivotal
- 4. 2017 SPRING FRAMEWORK 4.3 Last release in 4.3 branch support until 2019 will work with JDK 6,7,8,9 and Tomcat 6-9 Spring Framework 5 M5 Reactor 3
- 5. WHAT’S NEW SPRING FRAMEWORK 5.0 Roadmap ‣ 5.0 M5 available now ‣ 5.0 RC1: April 2017 ‣ 5.0 GA expected at in June (wait for JDK9 GA) JDK 8+, Servlet 3.1+, JMS 2.0+, JPA 2.1+, JUnit 5 Major baseline updates with Java EE 7
- 6. WHAT’S NEW SPRING FRAMEWORK 5.0 Core updates ‣ Java 8 in the core ‣ Java 9 full compatibility, jigsaw Web & Infrastructure ‣ HTTP/2 on client and server HTTP/2 Comes to Java ‣ Functional vs Annotation style ‣ Lambda oriented HTTP routing & processing ‣ spring-webflux ‣ Kotlin SPR-13716
- 7. WHAT’S NEW JDK9 ‣ Many general improvements * Compact Strings, G1, etc… ‣ Spring 4.3 and 5.0 can run on JDK9 ‣ Frameworks jar’s as Jigsaw-compliant modules on module path * Application module-info.java may refer framework modules
- 8. WHAT’S NEW HTTP/2 ‣ Servlet 4.0 – September 2017 * enforce support for HTTP/2 in Servlet containers * API for stream prioritization and push resources ‣ Tomcat/Jetty/Undertow * native HTTP/2 since in current Servlet 3.1 * Tomcat 8.5/9.0, Jetty 9.3, Undertow 1.3/1.4 ‣ Spring Framework 5.1 will support Servlet 4.0 * as well as support for new JDK HTTP client * 5.0 focus on native HTTP/2 on top of Tomcat, Jetty, Undertow
- 9. WHAT’S NEW FUNCTIONAL STYLE ‣ Spring 4.3 summarize annotation history * annotation based component model ‣ Spring 5 provides functional style API as an alternative * pragmatic bean registration and endpoint composition * no need for annotations or scanning ‣ Even better with Kotlin * Java 8 style is nice * Spring Kotlin’s extension make code even more concise
- 10. JAVA KOTLIN
- 11. ENTERPRISE CHALLENGES DO WE NEED TO CHANGE? “Enterprise” challenges and Reactive changes II
- 12. ENTERPRISE CHALLENGES BLOCKING IO LATENCY REAL MATTERS RESOURCE UTILIZATION IMPERATIVE CODE
- 13. SERVLET CONTAINER IN NUTSHELL
- 14. SERVLET CONTAINER IN NUTSHELL
- 16. THERE IS ANOTHER WAY
- 19. CURRENT STATE AND CHALLENGES NON-BLOCKING IO LATENCY REAL MATTERS RESOURCE UTILIZATION REACTIVE CODE
- 20. REACTIVEX CRASH COURSE Stream Abstraction ▸ Functional, declarative programming model ▸ Combine, transform, reduce sequences ▸ Focus on what, not how Stream (JDK8) ▸ Efficiently process collections ▸ Pull based and usable only once ▸ For non latency or infinite Reactive Library ▸ Stream(JDK8) like API ▸ Push based ▸ Latency sensitive and infinite seqs
- 21. Flux.fromIterable(Arrays.asList("foo", "bar", "foo")) .map(String::toUpperCase) .flatMap(s -> Flux.just(s.concat("!"))) .distinct() .publishOn(Schedulers.elastic()); RX
- 22. HOW TO WRITE NON BLOCKING REACTIVE STREAMS ▸ Specification for non-blocking libs interoperability ▸ Collaborative effort: Netflix, Pivotal, RedHat, Twitter, Lightbend ▸ JDK9 adoption java.util.concurrent.Flow ▸ Only 4 Interfaces http://www.reactive-streams.org https://spring.io/blog/2016/04/19/understanding-reactive-types
- 23. REACTOR 3: REACTIVE STREAMS WITH BACKPRESSURE
- 24. FLUX<T>
- 25. MONO<T>
- 26. SPRING 5 SPRING + REACTOR + RX = 🌞
- 28. UNDER THE HOOD
- 32. LINKS Aliaksei Zhynhiarouski twitter: @a_lithium http://www.reactive-streams.org https://spring.io/blog/2016/04/19/understanding-reactive-types Notes on Reactive Programming Part I Notes on Reactive Programming Part II Notes on Reactive Programming Part III https://github.com/aliaksei-lithium/spring5demo