1.
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/1
Spring Framework 5.0
Preview & Roadmap
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/
Juergen Hoeller
Spring Framework Lead
Pivotal

2.
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3.
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4.
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/2
On our way to 5.0
First up: 4.3

5.
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/3
Spring Framework 4.3
■ Last 4.x feature release!
■ 4.3 RC1: March 2016
■ 4.3 GA: May 2016
■ Extended support life until 2020
● on JDK 6, 7, 8 and 9
● on Tomcat 6, 7, 8 and 9
● on WebSphere 7, 8.0, 8.5 and 9
■ Programming model refinements brought forward to JDK 6+
● DI & MVC refinements, composed annotations

6.
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/4
The State of the Art: Component Classes
@Service
@Lazy
public class MyBookAdminService implements BookAdminService {
// @Autowired
public MyBookAdminService(AccountRepository repo) {
...
}
@Transactional
public BookUpdate updateBook(Addendum addendum) {
...
}
}

7.
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/5
Configuration Classes with Autowired Constructors
@Configuration
public class MyBookAdminConfig {
private final DataSource bookAdminDataSource;
// @Autowired
public MyBookAdminService(DataSource bookAdminDataSource) {
this.bookAdminDataSource = bookAdminDataSource;
}
@Bean
public BookAdminService myBookAdminService() {
MyBookAdminService service = new MyBookAdminService();
service.setDataSource(this.bookAdminDataSource);
return service;
}
}

8.
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/6
Refined MVC Controller Declarations
@Controller
@CrossOrigin
public class MyRestController {
@RequestMapping(path="/books/{id}", method=GET)
public Book findBook(@PathVariable long id) {
return this.bookAdminService.findBook(id);
}
@RequestMapping(path="/books/new", method=POST)
public void newBook(@Valid Book book) {
this.bookAdminService.storeBook(book);
}
}

9.
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/7
Precomposed Annotations for MVC Controllers
@RestController
@CrossOrigin
public class MyRestController {
@GetMapping("/books/{id}")
public Book findBook(@PathVariable long id) {
return this.bookAdminService.findBook(id);
}
@PostMapping("/books/new")
public void newBook(@Valid Book book) {
this.bookAdminService.storeBook(book);
}
}

10.
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/8
Themes for 5.0:
JDK 9, HTTP/2, Reactive

11.
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/9
Spring Framework 5.0
■ A new framework generation for 2017+
■ 5.0 M1: mid 2016
■ 5.0 RC1: December 2016
■ Major baseline upgrade
● JDK 8+, Servlet 3.0+, JMS 2.0+, JPA 2.1+, JUnit 5
■ Key infrastructure themes
● JDK 9 and Jigsaw modules
● Servlet 4.0 and HTTP/2
● Reactive architectures

12.
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/10
JDK 8+ Baseline
■ Spring 4.x: comprehensive support for Java 8 features in an application's
component classes
● Spring annotations declared as repeatable already
● typical Spring callback interfaces designed in a lambda-friendly style
● reflectively adapting to user-provided signatures
■ Spring 5.x: use of Java 8 features in the framework's own core codebase
● lambdas, method references, default methods in interfaces
● able to expose JDK 8 API types in core interfaces and classes:
java.util.Optional, java.util.function, java.util.stream
■ An important enabler for further evolution of the framework...

13.
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/11
Comprehensive JDK 9 Support
■ Spring 5 schedule is close to JDK 9 schedule
● JDK 9 intends to go GA in March 2017
■ Jigsaw – a new module system for applications
● symbolic module names and requires/exports metadata for jar files
● currently no versioning, just structuring plus visibility enforcement
● module path as alternative to class path
■ New HTTP client and general support for HTTP/2
● superseding the outdated java.net.HttpURLConnection
● TLS extension for ALPN

14.
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/12
Using Jigsaw with Spring
■ Spring Framework jars coming with Jigsaw metadata out of the box
● internally declaring module-info for each jar
■ Separate module namespace, following Maven Central jar naming
● spring-context, spring-jdbc, spring-webmvc
■ An application's module-info.java can then look as follows...
module my.app.db {
requires java.sql;
requires spring.jdbc;
}

15.
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/13
The Importance of HTTP/2 (RFC 7540)
■ Enormous benefits over HTTP 1.1 (which dates back to 1996)
● binary protocol
● TLS (SSL) everywhere
● connection multiplexing
● headers compression
● request prioritization
● push of correlated resources
■ Browsers already implement HTTP/2 over TLS
● major websites work with HTTP/2 already: Google, Twitter, etc
● We need to embrace it in Java land as well!

16.
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/14
Spring 5 and HTTP/2
■ Servlet 4.0 – mid 2017
● enforces support for HTTP/2 in Servlet containers
● API features for stream prioritization and push resources
■ Tomcat / Jetty / Undertow
● native HTTP/2 support available in current Servlet 3.1 containers
● Tomcat 8.1 / 9.0, Jetty 9.3, Undertow 1.3
■ Spring Framework 5.0 will ship dedicated Servlet 4.0 support
● as well as dedicated support for the new JDK 9 HTTP client
● but like 4.3, it focuses on native HTTP/2 on top of Tomcat / Jetty / Undertow

17.
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/15
The Importance of Reactive Architectures

18.
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/16
Reactive Streams Specification
■ Focus on infrastructure interoperability
● web servers, datastore drivers
● and of course: web frameworks!
■ Minimal API
● Publisher + Subscriber/Subscription for backpressure support
● repackaged into JDK 9 as java.util.concurrent.Flow
■ Operators left up to composition libraries
● map, flatMap, take, subscribe, ...
● Reactor, RxJava, Akka Streams

19.
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/17
Reactive Web Endpoints in Spring
■ A Spring MVC like endpoint model based on a reactive foundation
● reusing the common Spring MVC programming model style
● but accepting and returning reactive streams
■ A new HTTP endpoint engine on top of a non-blocking runtime
● Netty, Jetty, Tomcat, Undertow
● not based on the Servlet API but adaptable to a Servlet container
■ Currently developed as a public R&D project
● https://github.com/spring-projects/spring-reactive/
● to be merged into Spring Framework master for 5.0 M1 in June

20.
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/18
Reactive Web Controller with RxJava Observable
@Controller
public class MyReactiveWebController {
@RequestMapping("/capitalize")
public Observable<Person> capitalize(Observable<Person> persons) {
return persons.map(person -> {
person.setName(person.getName().toUpperCase());
return person;
}
}
}

21.
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/19
Reactive Web Controller with Reactor Flux
@Controller
public class MyReactiveWebController {
@RequestMapping("/capitalize")
public Flux<Person> capitalize(Flux<Person> persons) {
return persons.map(person -> {
person.setName(person.getName().toUpperCase());
return person;
}
}
}

22.
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/20
Reactive Web Controller with Repository Interop
@Controller
public class MyReactiveWebController {
@Autowired
private MyRepository<Person> repository;
@RequestMapping("/insert")
public Mono<Void> insert(Flux<Person> persons) {
return this.repository.insert(persons);
}
}

23.
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/21
Reactive Infrastructure All Around
■ Reactive datastore drivers becoming available
● Postgres, Mongo, Couchbase
■ Reactive HTTP clients
● Netty, Jetty, OkHttp
■ Reactive Streams Commons project
● Servlet adapters: by default against Servlet 3.1 async I/O
● native container SPI for more efficiency at runtime
● currently a collaboration between Spring and Jetty / Tomcat

24.
Unless otherwise indicated, these slides are © 2013-2016 Pivotal Software, Inc. and licensed under a
Creative Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/3.0/22
Summary
Spring Framework 4.3 (May 2016)
Programming model refinements on JDK 6/7/8
Spring Framework 5.0 (early 2017)
JDK 8+9, Jigsaw, HTTP/2, Reactive Streams

25.
Watch the video with slide synchronization on
InfoQ.com!
http://www.infoq.com/presentations/spring-
framework-5