Remember the choose your own adventure books that you used to read as a kid? This session is a reincarnation of a choose your own adventure book as a conference talk! You'll learn about Spring Boot, Docker, and Kubernetes in this talk, along with the choices you make in the following areas: * What kind of application architecture to build? Monolith or microservices? * Would you like to use Java or Kotlin? * MySQL, PostgreSQL, or MongoDB? * Spring MVC or Spring WebFlux? * Angular, React, or Vue.js? * PWA or mobile app? * Istio with Kubernetes or Kubernetes without Istio? GitHub repos of demos: * Monolith: https://github.com/mraible/healthy-hipster * Microservices: https://github.com/mraible/djug-microservices

1. Ray Tsang and Matt Raible
Choose Your Own Adventure with JHipster & K8s
@saturnism | @mraible

2. Are you a Java developer?

3. Are you a Web developer?

4. Do you like web frameworks?

5. Hello, JHipster!
https://jhipster.tech
Application Generator
Development Platform
Popular Open Source Project
Monoliths, Microservices, and Gateways

6. Who is Ray Tsang?
Developer Advocate at Google Cloud
Kubernetes Enthusiast
JHipster Committer
Backpacker, snowboarder, photographer
@saturnism on Twitter

7. Who is Matt Raible?
Developer Advocate at Okta
Web Framework Enthusiast
JHipster Committer
Skier, rafter, classic VW fan
@mraible on Twitter

8. JHipster Gives You Lots of Options
Spring Boot
Spring Security
SQL or NoSQL
Maven or Gradle
Bootstrap
Angular, React, or Vue
End-to-End Tests
Performance Tests
26,000+ options https://arxiv.org/abs/1710.07980

9. Choose Your Own Adventure

10. Spring Boot

11. Google Trends for Spring Boot

12. The Rest of the Java Pack

13. Docker

14. Kubernetes

15. Monolith vs. Microservice Architecture
Monolith Microservices
Pro Single app to manage
Single CI/CD pipeline
Low latency between calls
Low coupling
Faster build / deploy cycle per service
Easier to scale out individual services
Con Slow build / deploy cycle
High coupling
Harder to scale out
Multiple apps to manage
Multiple CI/CD pipeline
Multiple EVERYTHING!
High latency and issues between calls
Proper service boundary

16. Monolith
Legacy forever!
At least only one pile of...

17. Microservices
So you like the difficult stuff?

18. Unpopular Opinion
"Monoliths are the future because the problem people are trying to solve with
microservices doesn’t really line up with reality."
https://changelog.com/posts/monoliths-are-the-future

19. Maven or Gradle?

20. Java, Kotlin, .NET, or Node?
jhipster/jhipster-kotlin
jhipster/jhipster-dotnetcore jhipster/generator-jhipster-nodejs

21. The End

22. FYI... Micronaut & Quarkus Support is in development
https://github.com/jhipster/generator-jhipster-micronaut
npm install -g generator-jhipster-micronaut
mhipster
https://github.com/jhipster/jhipster-quarkus
npm install -g generator-jhipster-quarkus
jhipster -d --blueprint quarkus

23. Which Authentication Type?

24. Authentication: Session, JWT, or OAuth 2.0?
Because friends don't let friends write authentication!

25. MySQL, PostgreSQL, or MongoDB?

26. Spring MVC or Spring WebFlux?

27. CRUD with WebFlux?
https://github.com/jhipster/generator-jhipster/issues/7608

28. What do you want to build?
Monoliths
21 Points Health
Blog
Bug Tracker
Microservices
Online Store
Blog + Store
https://github.com/jhipster/jdl-samples

29. Angular, React, or Vue.js?

30. Comparing Angular, React, and Vue.js

31. Google Trends for Angular, React, and Vue.js

32. PWA or Mobile?

33. The End

34. Yes to PWA!
<script>
if ('serviceWorker' in navigator) {
window.addEventListener('load', function() {
navigator.serviceWorker.register('/service-worker.js')
.then(function () {
console.log('Service Worker Registered');
});
});
}
</script>
src/main/webapp/index.html

35. PWA Requires HTTPS
@EnableWebSecurity
public class SecurityConfiguration extends WebSecurityConfigurerAdapter {
@Override
protected void configure(HttpSecurity http) throws Exception {
http.requiresChannel()
.requestMatchers(r -> r.getHeader("X-Forwarded-Proto") != null)
.requiresSecure();
}
}
SecurityConfiguration.java
https://developer.okta.com/blog/2018/07/30/10-ways-to-secure-spring-boot

36. Want Ionic? Use Ionic4J!

37. Want React Native? Use Ignite JHipster!

38. Let's Get Started!
start.jhipster.tech

39. High Code Quality and Performance by Default
https://github.com/mraible/healthy-hipster

40. Where to deploy to?

41. Kubernetes
Created by Google in 2014
Based on learnings from Google's internal orchestration tool
Manages deployment of containers across a cluster of machines
Currently managed by Cloud Native Foundation
Single deployment target, multiple cloud/on-prem environments

42. Kubernetes
You've chosen the path to become a
YAML developer...
Everything will be YAML from here on!
Don't fear. JHipster will generate all the
YAMLs for you!

43. With Istio or Without?
• Kubernetes manages deployment of applications
• Istio manages the services to service communication
• Retries
• Traces
• Monitoring
• L7 Routing
• L7 Load Balancing (internal and external)
• mTLS
• Out of the box Observability with Jaeger, Kiali, Prometheus, Grafana

44. Kubernetes to the Cloud!
Run Kubernetes sub-generator
Deploy to GKE on GCP
Have a look 👀 at K9s
Who let the pods out?!?
https://github.com/derailed/k9s

45. Additional Configuration for OAuth 2.0
JHipster uses Keycloak by default
Configuration is not auto-generated for Kubernetes
Remember to configure Issuer, Client ID, and Client Secret

46. Load Balancer, NodePort, or Ingress...
JHipster Gateway has 2 functionalities
• The frontend code
• Routing ("/service/blog/api" → Blog Service)
• Has Retries
• But 1 extra hop
Kubernetes has built-in URL mapping via Ingress
• No retries

47. The End
You survived today's encounter with YAML, and
the paradox of choice.
Take the JHipster adventure, and good luck!
Congratulations!

48. Coming Soon: JHipster 7! 🚀
https://github.com/jhipster/generator-jhipster/issues/10958

49. Questions?
49
Keep in Touch!
@mraible / matt.raible@okta.com
@saturnism / rayt@google.com
Presentation
speakerdeck.com/mraible
Code
github.com/mraible