Reactive Java Microservices with Spring Boot and JHipster - Kansas City JUG 2023

Transcript

1. Reactive Java Microservices
   
   
   with Spring Boot and JHipster
   June 8, 2023
   Matt Raible | @mraible
   Photo by Tianyi Ma
   

   https://unsplash.com/photos/o7f4K13f2eE
   

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3. What is JHipster?
   

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4. 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
   

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5. Monolith, Gateway, or Microservices?
   
   
   Spring MVC or Spring WebFlux?
   
   
   Authentication Type?
   
   
   Database Type?
   
   
   Build Tool?
   
   
   Web Framework?
   JHipster Options
   

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6. https://start.jhipster.tech
   

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7. Thriving OSS Project
   Started by Julien Dubois on October 21, 2013
   App Generator, Platform, Learning Tool …
   

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8. @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
   

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12. developer.okta.com
    

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13. developer.auth0.com
    

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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
    🍃
    

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15. Microservices Visionaries
    

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16. “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
    

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18. “Do one thing and do it well.”
    

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21. Spring WebFlux!
    

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22. Spring MVC Code
    @PostMapping("/points")
    
    
    public ResponseEntity 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);
    
    
    }
    

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23. Spring WebFlux Code
    @PostMapping("/points")
    
    
    public Mono> 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);
    
    
    }
    
    
    }
    
    
    );
    
    
    }
    

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24. Spring Cloud Gateway
    

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25. 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: yelp.com/callback
    
    
    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 2.0 and OIDC
    

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27. Demo
    Create microservices with JDL
    
    
    Run apps and e2e tests
    
    
    Switch identity providers
    
    
    Run everything with Docker
    
    
    https://github.com/oktadev/auth0-
    java-microservices-examples
    🤓
    

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28. https://auth0.com/blog/micro-frontends-for-java-microservices
    

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29. https://github.com/jhipster/jhipster-lite
    

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30. What You Learned
    

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31. https://developer.okta.com/blog/2021/01/20/reactive-java-microservices
    

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32. https://developer.okta.com/blog/2021/06/01/kubernetes-spring-boot-jhipster
    

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33. npm install -g generator-jhipster-kotlin
    

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34. https://wiki.openjdk.java.net/display/loom/Main
    

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35. https://spring.io/blog/2023/02/27/web-applications-and-project-loom
    

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36. JHipster is Knowledge
    

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37. The JHipster Mini-Book
    

    Written with Asciidoctor
    
    
    Free download from InfoQ:
    
    
    infoq.com/minibooks/jhipster-mini-book
    
    
    Quick and to the point, 161 pages
    
    
    Developed a real-world app:
    
    
    www.21-points.com
    
    
    Buy for $20 or download for FREE
    

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38. 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 single artifact
    

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39. Learn More
    stackoverflow.com
    Spring Boot
    
    
    spring.io/guides
    JHipster
    
    
    www.jhipster.tech
    Auth0
    
    
    developer.auth0.com
    

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40. developer.okta.com/blog/tags/java
    
    
    @oktadev
    

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41. developer.auth0.com
    
    
    @auth0
    

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42. Join us as an Auth0 Ambassador!
    auth0.com/ambassador-program
    

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43. https://a0.to/nl-signup/java
    
    
    https://developer.auth0.com/newsletter
    

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44. Action: Try JHipster! 🚀
    npm i -g generator-jhipster
    

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45. git clone https://github.com/oktadeveloper/okta-spring-web
    fl
    ux-react-example.git
    https://github.com/oktadev/auth0-java-microservices-examples
    Use the Source, Luke!
    

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46. developer.okta.com
    

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47. Thanks!
    
    
    Keep in Touch
    
    
    raibledesigns.com
    
    
    @mraible
    
    
    Presentations
    
    
    speakerdeck.com/mraible
    
    
    Code
    
    
    github.com/oktadev
    developer.auth0.com
    

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