Migrating to Spring Boot 2 and Webflux

Release history, dependency changes and gotchas of upgrading Spring Boot.

What's new in Spring Boot 2.

Introduction to Reactive and Spring Webflux.

Transcript

1. Migrating to Spring Boot 2 and Webflux Gotchas migrating to Spring Boot 2 and Demo Migration from MVC to Webflux by @trevorgowing hosted by @travelstart
2. Introduction
3. Features of Spring and Boot • Core Tech [IOC, events, resources, i18n, validation, data binding, type conversion, SpEL, AOP] • Testing [Mocks, TestContext, MockMVC, WebTestClient] • Data Access [TX, DAO, JDBC, ORM, XML] • Integration [remoting, JMS, JCA, JMX, email, tasks, scheduling, cache] • Web [MVC, WebFlux] • Languages [Kotlin, Groovy] • Stand-alone application • Embed Tomcat, Jetty or Undertow • Opinionated 'starter' dependencies • Automatic configuration • Production-ready features [metrics, health checks, externalized configuration] • No code gen or XML
4. A little about me
5. What I have been doing recently? • Developed 2 - 1.x • Migrated 3 - 1.x -> 2.0 ◦ 1 - Maven -> Gradle • Migrated 1 - Traditional deployment (web.xml & application.xml) -> 2.0 (Java Config) • Developed 0 - Webflux • spring-boot-starter-web • spring-boot-starter-json • spring-boot-starter-amqp • spring-boot-starter-security • spring-boot-starter-data-jpa • spring-boot-starter-actuator • spring-boot-starter-data-redis • spring-boot-starter-web-services
6. History Time
7. Spring Framework & Boot Release History • 1.0 - March 2004 • 2.0 - November 2006 • 3.0 - June 2010 • 4.0 - December 2013 • 5.0 - September 2017 • 5.0.7 - June 2018 - Latest • 1.0 - April 2014 • 1.1 - June 2014 • 1.2 - December 2014 • 1.3 - November 2015 • 1.4 - July 2016 • 1.5.1 - January 2017 • 2.0 - March 2018 • 2.0.3 - June 2018 - Latest
9. Dependency upgrades 1.2.x - > 1.3.x • Spring Framework 4.1.9 -> 4.2.8 • Spring Security 3.2.9 -> 4.0.4
10. Spring Security 3.x -> 4.0 Gotchas • Default filter paths renamed e.g. `/j_spring_security_logout` -> `/logout` • Overriding default response headers no longer disables all unless explicitly specified • Roles are automatically prefixed with “ROLE_”
11. Dependency upgrades 1.3.x -> 1.4.x • Elasticsearch 1.5.2 -> 2.4.5 • Hibernate 4.3.11 -> 5.0.12 • MongoDB 2.13.3 -> 3.2.2 • Solr 4.10 -> 5.5 • Spring Data Gosling SR5 -> Hopper SR11 • Spring Framework 4.2.8 -> 4.3.9 (Requires Jackson 2.6+) • Spring Security 4.0.4 -> 4.1.4 • Tomcat 8.0.37 -> 8.5.15 (BIO Connector, Comet, JSR-77, InstanceListener removed)
12. Hibernate 4.x -> 5.0 Gotchas • ‘hibernate.id.new_generator_mappings’ property default changed to true. ◦ `spring.jpa.hibernate.use-new-id-generator-mapping` defaults to false • NamingStrategy split in two: ◦ ImplicitNamingStrategy - used whenever a table or column is not explicitly named ◦ PhysicalNamingStrategy - used to convert a "logical name" into a physical name • I experienced this silently creating new tables, that were not previously explicitly named in combination with ddl-auto = update.
13. Hibernate Id Generation Strategy for MySQL • Default Id generation strategy changed from Identity to Table when using Auto generation strategy with MySQL. Table strategy not recommend. Hibernate 4.x Hibernate 5.x
14. Dependency upgrades 1.4.x -> 1.5.x • Gradle 1.2 -> 2.9 (Groovy 1.8 -> 2.3.2) • Spring Data Hopper SR11 -> Ingalls SR13 • Spring Security 4.14 -> 4.2.7
15. Actuator 1.4.x -> 1.5.x Gotchas • Sensitive endpoints are now secured by default (even without spring-security) ◦ Override with: `management.security.enabled=false` • Default role changed from ‘ADMIN’ to ‘ACTUATOR’ ◦ override with: `management.security.roles={ROLE}`
16. 2 . 0
17. Dependency upgrades 1.5 -> 2.0 • Flyway 3.2.1 -> 5.0.7 (Java 8, Maven 3 & Gradle 3 Baselines, Java 9 & Cockroach Support) • Gradle 2.9 -> 4.x • Java 8 baseline & Java 9 support • Hibernate 5.0.12 -> 5.2.17 • Mockito 1.10.19 -> 2.15.0 (argThat moved to org.mockito.hamcrest.MockitoHamcrest) • Spring Data Ingalls SR13 -> Kay SR8 ◦ (Java 8, Framework 5, Reactive [Mongo, Redis, Couch, Cassandra], Java 9 Support) • Spring Framework and Security 4.x.x -> 5.0.x • Thymeleaf 2.1.6 -> 3.0.9 (https://www.thymeleaf.org/doc/articles/thymeleaf3migration.html)
18. Changes and Gotchas • Default JDBC connection pool: Tomcat - > Hikari • Gradle plugin rewritten ◦ Spring Boot & Dependency Management plugins separated ◦ BootJar & BootWar tasks replace BootRepackage and extend Java Jar & War tasks ◦ BootRun extends JavaExec • Properties ◦ A number of properties have been renamed, replaced or re-namespaced ◦ Relaxed binding has been tightened ◦ Org.springframework.boot.bind package has been removed & replaced by new binding api (see https://github.com/spring-projects/spring-boot/wiki/Relaxed-Binding-2.0)
19. Changes and Gotchas continued... • Web starters e.g. thymeleaf no longer transitively depend on starter-web • Jackson JSR-310 dates now written as ISO8601 strings by default ◦ Restore previous behaviour ‘spring.jackson.serialization.write-dates-as-timestamps=true’ • HTTP suffix pattern matching is disabled by default ◦ GET /proj/spring-boot.json will no longer map to @GetMapping(“/proj/spring-boot) • ‘spring.jpa.hibernate.use-new-id-generator-mappings’ now defaults to true • Data repository method signature changes ◦ e.g. T findOne(T id) -> Optional<T> findById(T id)
20. New Features • HTTP/2 Support (Web Server specific) • Kotlin 1.2 Support • Thymeleaf javax.time support • Jackson & Java 8 data types packaged in ‘spring-boot-starter-json’
21. Actuator 1.5 -> 2.0 • Technology agnostic: MVC or Webflux • Request & Response structure changes • Read/Write Model -> CRUD Model • Config with `endpoints.{name}.enabled` & `endpoints.{name}.sensitive` properties -> `management.endpoints.web.exposure.include` • Custom security -> Spring Security • Mapped under `/` -> Mapped under `/actuator` • Custom metrics -> Micrometer.io
23. A little about Reactive
24. Reactive Streams Specification
27. Project Reactor
28. Spring Web - MVC and/or Webflux
29. Enough talking, demo time! https://github.com/trevorgowing/spring-boot-migration
30. But is it faster?
31. 2500 Concurrent Users
32. 5000 Concurrent Users
33. 10000 Concurrent Users
34. References - Migration • https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-2.0-Migrati on-Guide • https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-2.0-Releas e-Notes • https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-1.5-Releas e-Notes • https://vladmihalcea.com/why-should-not-use-the-auto-jpa-generationtype- with-mysql-and-hibernate/ • https://vladmihalcea.com/why-you-should-never-use-the-table-identifier-gen erator-with-jpa-and-hibernate/
35. References - Spring Boot 2 • https://docs.spring.io/spring-boot/docs/current/reference/html/ • https://www.brighttalk.com/webcast/14893/304441/introducing-spring-bo ot-2-0 • https://github.com/philwebb/spring-boot-2-webinar • http://www.baeldung.com/new-spring-boot-2 • http://www.baeldung.com/spring-boot-actuators • http://www.baeldung.com/spring-security-5-reactive
36. References - Reactive & Reactor • https://www.reactivemanifesto.org/ • http://www.reactive-streams.org/ • https://projectreactor.io/ • https://spring.io/blog/2016/06/07/notes-on-reactive-programming-part-i-th e-reactive-landscape • https://spring.io/blog/2016/06/13/notes-on-reactive-programming-part-ii-wr iting-some-code • https://spring.io/blog/2016/07/20/notes-on-reactive-programming-part-iii-a- simple-http-server-application • https://spring.io/blog/2016/04/19/understanding-reactive-types
37. References - Webflux • https://docs.spring.io/spring/docs/current/spring-framework-reference/we b-reactive.html • http://www.baeldung.com/spring-5 • http://www.baeldung.com/spring-security-5-reactive • https://www.journaldev.com/20763/spring-webflux-reactive-programming • https://acuriouscoder.net/spring-webflux-annotation-based/ • http://javasampleapproach.com/spring-framework/spring-webflux/springbo ot-webflux-annotation-based-programming-model • https://dzone.com/articles/annotated-controllers-spring-webwebflux-and-te stin
38. References - Other • https://medium.com/@the.raj.saxena/springboot-2-performance-servlet-sta ck-vs-webflux-reactive-stack-528ad5e9dadc • https://www.romaniancoder.com/book-review-clean-architecture-by-robert- c-martin/ • http://www.sportingnews.com/au/football/news/2018-fifa-world-cup-who-i s-off-to-russia-who-missed-out/13kxz8c09i2s516e8v0esdl6mf