Java Microservices with Spring Boot and Spring Cloud

A lightning talk I gave at the Denver JUG meetup on December 11, 2019. This presentation shows how to build a secure microservices architecture with Spring Boot and Spring Cloud. It also shows you how you can generate the same architecture using JHipster. It's based on three blog posts I wrote:

* Java Microservices with Spring Boot and Spring Cloud
* Java Microservices with Spring Cloud Config and JHipster
* Secure Reactive Microservices with Spring Cloud Gateway

Transcript

1. Java Microservices with Spring Boot and Spring Cloud December 11, 2019 Matt Raible | @mraible Photo by Trish McGinity https://www.mcginityphoto.com
3. Blogger on raibledesigns.com and developer.okta.com/blog Web Developer and Java Champion Father, Husband, Skier, Mountain Biker, Whitewater Rafter Open Source Connoisseur Hi, I’m Matt Raible! Bus Lover Okta Developer Advocate
6. Create Java Microservices using start.spring.io http https://start.spring.io/starter.zip javaVersion==11 \ artifactId==discovery-service name==eureka-service \ dependencies==cloud-eureka-server baseDir==discovery-service \ | tar -xzvf -
7. Add JAXB for Java 11 <dependency> <groupId>org.glassfish.jaxb</groupId> <artifactId>jaxb-runtime</artifactId> </dependency>
8. Enable Eureka Server & Configure application.properties server.port=8761 eureka.client.register-with-eureka=false @EnableEurekaServer
9. Create Car Service http https://start.spring.io/starter.zip \ artifactId==car-service name==car-service baseDir==car-service \ dependencies==actuator,cloud-eureka,data-jpa,h2,data- rest,web,devtools,lombok | tar -xzvf -
10. Enable Discovery & Configure application.properties server.port=8090 spring.application.name=car-service @EnableDiscoveryClient
11. Create API Gateway http https://start.spring.io/starter.zip \ artifactId==api-gateway name==api-gateway baseDir==api-gateway \ dependencies==cloud-eureka,cloud-feign,data-rest,web,cloud- hystrix,lombok | tar -xzvf -
12. Enable Discovery & Configure application.properties spring.application.name=api-gateway @EnableDiscoveryClient
13. Build a REST API in Car Service @Data @NoArgsConstructor @Entity class Car { public Car(String name) { this.name = name; } @Id @GeneratedValue private Long id; @NonNull private String name; }
14. Build a REST API in Car Service @RepositoryRestResource interface CarRepository extends JpaRepository<Car, Long> { }
15. Build a REST API in Car Service @Bean ApplicationRunner init(CarRepository repository) { return args -> { Stream.of("Ferrari", "Jaguar", "Porsche", "Lamborghini", "Bugatti", "AMC Gremlin", "Triumph Stag", "Ford Pinto", "Yugo GV").forEach(name -> { repository.save(new Car(name)); }); repository.findAll().forEach(System.out::println); }; }
16. Consume Cars API in Gateway @EnableFeignClients @EnableCircuitBreaker @EnableDiscoveryClient @SpringBootApplication public class ApiGatewayApplication { public static void main(String[] args) { SpringApplication.run(ApiGatewayApplication.class, args); } }
17. Consume Cars API in Gateway @Data class Car { private String name; } @FeignClient("car-service") interface CarClient { @GetMapping("/cars") @CrossOrigin Resources<Car> readCars(); }
18. Consume Cars API in Gateway @RestController class CoolCarController { private final CarClient carClient; public CoolCarController(CarClient carClient) { this.carClient = carClient; } // code on next slide }
19. Consume Cars API in Gateway private Collection<Car> fallback() { return new ArrayList<>(); } @GetMapping("/cool-cars") @CrossOrigin @HystrixCommand(fallbackMethod = "fallback") public Collection<Car> goodCars() { return carClient.readCars() .getContent() .stream() .filter(this::isCool) .collect(Collectors.toList()); }
20. Consume Cars API in Gateway private boolean isCool(Car car) { return !car.getName().equals("AMC Gremlin") && !car.getName().equals("Triumph Stag") && !car.getName().equals("Ford Pinto") && !car.getName().equals(“Yugo GV"); }
21. Start everything with ./mvnw
22. Access https://localhost:8080/cool-cars
23. Java Microservices with Spring Boot and Spring Cloud developer.okta.com/blog/2019/05/22/java-microservices-spring-boot-spring-cloud
24. Java Microservices with Spring Cloud Config & JHipster developer.okta.com/blog/2019/05/23/java-microservices-spring-cloud-config
25. Generated with JDL: Gateway application { config { baseName gateway, packageName com.okta.developer.gateway, applicationType gateway, authenticationType oauth2, prodDatabaseType postgresql, serviceDiscoveryType eureka, testFrameworks [protractor] } entities Blog, Post, Tag, Product } jhipster.tech/jdl/#application_options
26. Generated with JDL: Blog with PostgreSQL application { config { baseName blog, packageName com.okta.developer.blog, applicationType microservice, authenticationType oauth2, prodDatabaseType postgresql, serverPort 8081, serviceDiscoveryType eureka } entities Blog, Post, Tag }
27. Generated with JDL: Store with MongoDB application { config { baseName store, packageName com.okta.developer.store, applicationType microservice, authenticationType oauth2, databaseType mongodb, devDatabaseType mongodb, prodDatabaseType mongodb, enableHibernateCache false, serverPort 8082, serviceDiscoveryType eureka } entities Product }
28. Generated with JDL: Entities for Blog entity Blog { name String required minlength(3), handle String required minlength(2) } entity Post { title String required, content TextBlob required, date Instant required } entity Tag { name String required minlength(2) }
29. Generated with JDL: Entities for Store + Relationships entity Product { title String required, price BigDecimal required min(0), image ImageBlob } relationship ManyToOne { Blog{user(login)} to User, Post{blog(name)} to Blog } relationship ManyToMany { Post{tag(name)} to Tag{post} }
30. Generated with JDL: Pagination and Microservice paginate Post, Tag with infinite-scroll paginate Product with pagination microservice Product with store microservice Blog, Post, Tag with blog
31. Generated with JDL: Docker Compose deployment { deploymentType docker-compose appsFolders [gateway, blog, store] dockerRepositoryName "jmicro" consoleOptions [zipkin] }
32. JDL Studio
33. What’s Next for JHipster? Full Reactive with WebFlux and Spring Cloud Gateway Spring Boot 2.2 GraphQL and Micro Frontends
34. JHipster Reactive Microservices in Alpha github.com/jhipster/generator-jhipster/issues/7608
35. Reactive Microservices with Spring Cloud Gateway developer.okta.com/blog/2019/08/28/reactive-microservices-spring-cloud-gateway
36. git clone https://github.com/oktadeveloper/okta-spring-webflux-react- example.git github.com/oktadeveloper/java-microservices-examples Use the Source, Luke!
37. developer.okta.com/blog @oktadev
38. Thanks! Keep in Touch raibledesigns.com @mraible Presentations speakerdeck.com/mraible Code github.com/oktadeveloper developer.okta.com