Micro Frontends for Java Microservices - Denver Microservices 2023

You've figured out how to split up your backend services into microservices and scale your teams to the moon, right?

But what about the front end? Are you still building monoliths for your UI?

If so, you might want to check out micro frontends—basically extensions to the microservices pattern, where the concept is extended to the front end.

Find out how to package and deploy your microservices and their UIs in the same artifact, as well as make it possible to test and develop them independently.

In this live session, Matt will show you how to build a microservices and micro frontends architecture using React, Spring Boot, and Spring Cloud.

Related blog post: https://auth0.com/blog/micro-frontends-for-java-microservices
GitHub repo: https://github.com/oktadev/auth0-micro-frontends-jhipster-example
Demo script: @oktadev/auth0-micro-frontends-jhipster-example/blob/main/demo.adoc

Transcript

1. Micro Frontends for Java Microservices June 27, 2023 Matt Raible | @mraible Photo by Pieter van de Sande 
 https://unsplash.com/photos/r6BdUpN_iSk
2. @mraible Hi, I’m Matt Raible Father, Husband, Skier, Mountain Biker, Whitewater Rafter Bus Lover Web Developer and Java Champion Okta Developer Advocate Blogger on raibledesigns.com and developer.okta.com/blog @mraible
6. developer.okta.com
7. developer.auth0.com
8. Agenda A brief history of microservices Microservices with Java Microservices with JHipster Introduction to Micro Frontends Live Demo Securing microservices with OAuth 2.1 Action!
9. Microservices Visionaries
10. “Any organization that designs a system (defined broadly) will produce a design whose structure is a copy of the organization's communication structure.” Conway’s Law Melvin Conway 1967
12. “Do one thing and do it well.”
13. Microservices with Java
14. Spring History of Spring October 2002 - Rod Johnson writes J2EE Design & Development 2004 - Spring 1.0 2006 - Spring 2.0 with better XML 2009 - JavaConfig 2014 - Spring Boot 1.0 2015 - Spring Cloud 1.0 🍃
17. Spring WebFlux!
18. Spring MVC Code @PostMapping("/points") public ResponseEntity<Points> createPoints(@Valid @RequestBody Points points) throws URISyntaxException { log.debug("REST request to save Points : {}", points); if (points.getId() != null) { throw new BadRequestAlertException("A new points cannot already have an ID", ENTITY_NAME, "idexists"); } Points result = pointsRepository.save(points); pointsSearchRepository.save(result); return ResponseEntity .created(new URI("/api/points/" + result.getId())) .headers(HeaderUtil.createEntityCreationAlert( applicationName, true, ENTITY_NAME, result.getId().toString())) .body(result); }
19. Spring WebFlux Code @PostMapping("/points") public Mono<ResponseEntity<Points>> createPoints(@Valid @RequestBody Points points) throws URISyntaxException { log.debug("REST request to save Points : {}", points); if (points.getId() != null) { throw new BadRequestAlertException("A new points cannot already have an ID", ENTITY_NAME, "idexists"); } return pointsRepository .save(points) .flatMap(pointsSearchRepository::save) .map( result -> { try { return ResponseEntity .created(new URI("/api/points/" + result.getId())) .headers(HeaderUtil.createEntityCreationAlert( applicationName, true, ENTITY_NAME, result.getId().toString())) .body(result); } catch (URISyntaxException e) { throw new RuntimeException(e); } } ); }
20. https://developer.okta.com/blog/2021/01/20/reactive-java-microservices
21. What is JHipster?
22. Thriving OSS Project Started by Julien Dubois on October 21, 2013 App Generator, Platform, Learning Tool …
23. How to Use JHipster Install JHipster using npm: npm install -g generator-jhipster Create a directory and cd into it: take app Run it! jhipster
24. Monolith, Gateway, or Microservices? Spring MVC or Spring WebFlux? Authentication Type? Database Type? Build Tool? Web Framework? JHipster Options
25. https://start.jhipster.tech
26. https://start.jhipster.tech/jdl-studio
28. JHipster Microservices Architecture
29. JHipster Micro Frontends Architecture
30. ⚡Micro Frontends https://martinfowler.com/articles/micro-frontends.html
31. Native Federation https://twitter.com/ManfredSteyer/status/1564312149580582912
32. Why should Java developers care?
33. Demo Create apps with JDL Run apps and e2e tests Run everything with Docker Switch identity providers @oktadev/auth0-micro-frontends- jhipster-example 🤓
34. Secure Microservices with OAuth 2.1 https://oauth.net/2.1
35. Improvements in OAuth 2.1 PKCE is required for all clients using the authorization code flow Redirect URIs must be compared using exact string matching The Implicit grant is omitted from this specification The Resource Owner Password Credentials grant is omitted from this specification Bearer token usage omits the use of bearer tokens in the query string of URIs Refresh tokens for public clients must either be sender-constrained or one-time use
36. yelp.com/callback Back to redirect URI with authorization code Exchange code for access token and ID token accounts.google.com Email ********** Go to authorization server Redirect URI: yelp.com/cb Scope: openid profile Authorization Server yelp.com Connect with Google Resource owner Client accounts.google.com 
 Allow Yelp to access your public profile and contacts? No Yes Request consent from resource owner Hello Matt! accounts.google Get user info 
 with access token /userinfo OAuth 2.1 and OIDC
37. Spring Cloud Gateway
38. Relay an access token in Spring Cloud Gateway spring: cloud: gateway: default-filters: - TokenRelay
39. Reactive Microservices with Spring Cloud Gateway https://developer.okta.com/blog/2019/08/28/reactive-microservices-spring-cloud-gateway
40. https://auth0.com/blog/micro-frontends-for-java-microservices
41. https://developer.okta.com/blog/2021/01/20/reactive-java-microservices
42. https://developer.okta.com/blog/2021/06/01/kubernetes-spring-boot-jhipster
43. https://dev.to/jhipster
44. npm install -g generator-jhipster-kotlin
45. JHipster Official Blueprints https://www.jhipster.tech/modules/official-blueprints
46. https://github.com/jhipster/jhipster-lite
47. What You Learned
48. What’s Next for JHipster? GraalVM Spring Boot 3.1 GraphQL * These are my personal interests.
49. JHipster is Knowledge
50. JHipster ❤ Open Collective https://opencollective.com/generator-jhipster
51. The JHipster Mini-Book 
 Written with Asciidoctor Free download from InfoQ: infoq.com/minibooks/jhipster-mini-book Quick and to the point, 158 pages Developed a real-world app: www.21-points.com Buy for $20 or download for FREE
52. The Angular Mini-Book 
 Written with Asciidoctor Free download from InfoQ: infoq.com/minibooks/angular-mini-book Angular 15 and Spring Boot 3.0 Angular Material, Bootstrap, Kotlin Spring Security and best practices Deploy separate apps and a single artifact
53. Learn More stackoverflow.com Spring Boot spring.io/guides JHipster www.jhipster.tech Auth0 developer.auth0.com
54. developer.auth0.com @oktadev
55. Action: Try JHipster! 🚀 npm i -g generator-jhipster
56. git clone https://github.com/oktadeveloper/okta-spring-web fl ux-react-example.git https://github.com/oktadev/auth0-micro-frontends-jhipster-example Use the Source, Luke!
57. Thanks! Keep in Touch raibledesigns.com @mraible Presentations speakerdeck.com/mraible Code github.com/oktadev developer.okta.com developer.auth0.com
58. developer.okta.com