Creando microservicios con Java MicroProfile y TomEE - OGBT
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César Hernández discusses creating microservices using Java, MicroProfile, and Apache TomEE, highlighting his extensive experience as a software engineer and open-source advocate. The presentation covers the architecture of microservices, features of Eclipse MicroProfile, and tools for building cloud-native applications, with a focus on health checks, metrics, and JWT for security. Additionally, resources and community support for learning and implementing microservices are provided.
![@CesarHgt @tomitribejugbaq.org
Familiarize yourself with the API
● Default endpoints:
○ http://host:port/health
○ http://host:port/<app-context>/health
● General output:
○ {"checks":[],"outcome":"UP","status":"UP"}](https://image.slidesharecdn.com/ogbtlatamcreandomicroserviciosconjavamicroprofileytomee-200818165012/85/Creando-microservicios-con-Java-MicroProfile-y-TomEE-OGBT-29-320.jpg)
![@CesarHgt @tomitribejugbaq.org
{
"status": "UP",
"checks": [
{
"name": "second-check",
"status": "UP"
}
]
}
Producer Consumer
Health
Check
Procedure
DB](https://image.slidesharecdn.com/ogbtlatamcreandomicroserviciosconjavamicroprofileytomee-200818165012/85/Creando-microservicios-con-Java-MicroProfile-y-TomEE-OGBT-30-320.jpg)
![@CesarHgt @tomitribejugbaq.org
{
"status": "UP",
"checks": [
{
"name": "spotify-service",
"status": "UP",
"data": {
"key": "foo",
"foo": "bar"
}
},
{
"name": "db-check",
"status": "UP"
}
]
}
Producer Consumer
DB
Service](https://image.slidesharecdn.com/ogbtlatamcreandomicroserviciosconjavamicroprofileytomee-200818165012/85/Creando-microservicios-con-Java-MicroProfile-y-TomEE-OGBT-31-320.jpg)
Creando microservicios con Java MicroProfile y TomEE - OGBT
- 1. @CesarHgt @tomitribejugbaq.org César Hernández Creando Microservicios con Java, MicroProfile y Apache TomEE
- 2. @CesarHgt @tomitribejugbaq.org SPEAKER César Hernández ● Senior Software Engineer at Tomitribe ● Java Champion & Oracle Groundbreaker Ambassador ● Duke’s Choice Award 2016, 2017 ● Oracle Certified Professional ● +14 experience with Java Enterprise ● Apache TomEE, Jakarta EE Committer, Contributor for Microprofile. ● Open Source advocate, teacher and public speaker
- 4. @CesarHgt @tomitribejugbaq.org Agenda ● Introduction and setup ● Microservices ● Eclipse MicroProfile ● MicroProfile Configuration ● MicroProfile Health ● MicroProfile Metrics ● MicroProfile JWT ● MicroProfile Fault Tolerance ●
- 6. @CesarHgt @tomitribejugbaq.org A microservice architectural style is an approach to developing a single application as a suite of small services, each running in its own process and communicating with lightweight mechanisms, often an HTTP resource API. — Martin Fowler
- 7. @CesarHgt @tomitribejugbaq.org ● Infraestructura ● Arquitectura ● Investigación Perspectivas Micro Servicios
- 9. @CesarHgt @tomitribejugbaq.org ● Alcance ● Distribuídos ● Orquestación ● Adopción Retos Microservices
- 10. @CesarHgt @tomitribejugbaq.org Microservices Patterns teaches enterprise developers and architects how to build applications with the microservice architecture. — Chris Richardson
- 11. @CesarHgt @tomitribejugbaq.org Patrones Microservices Source: http://eventuate.io/exampleapps.html
- 12. @CesarHgt @tomitribejugbaq.org ● 39% plan to use Java to build microservices in the next year ● Using Java for cloud native applications ○ 44% Spring/Spring Boot ( - 13%) ○ 35% Jakarta EE ● Architectural Approach ○ 39% Microservices ○ 25% Monolithic (2x since 2019) ○ 23% Hybrid Microservices and Cloud-native Source: Jakarta EE Developer Survey 2020 - The Eclipse Foundation’s global survey of 2180 Java developers. ○ 29% MicroProfile ○ 16% Quarkus
- 14. @CesarHgt @tomitribejugbaq.org Eclipse MicroProfile ● An open-source community specification ● Focus on Enterprise Java microservices ● Generates: SPEC, API, and TCK. ● https://microprofile.io ● Implemented by different vendors.
- 15. @CesarHgt @tomitribejugbaq.org Eclipse MicroProfile MicroProfile 3.3 JAX-RS 2.1JSON-P 1.1CDI 2.0 Config Fault Tolerance JWT Propagation HealthMetrics Open Tracing Open API Rest Client JSON-B 1.0
- 16. @CesarHgt @tomitribejugbaq.org Eclipse Foundation https://www.eclipse.org/membership/documents/eclipse-foundation-overview.pdf 360+ Projects 275+ Members 1550+ Committers 195M+ Lines of code 15 Years 30 Members
- 17. @CesarHgt @tomitribejugbaq.org Eclipse foundation, EE4J, JavaEE, and JakartaEE
- 20. @CesarHgt @tomitribejugbaq.org ● Apache Tomcat + Java EE = Apache TomEE ● Built from Apache components ● MicroProfile compliant ● Footprint: 30MB zip, 100~MB memory ● TomEE 9.0.0-M2 (javax -> jakarta) ● tomee.apache.org
- 21. @CesarHgt @tomitribejugbaq.org TomEE JAX-RS (~ Microprofile) TomEE JAX-RS Microprofile Java Server Pages (JSP) Java Server Faces (JSF) Java Transaction API (JTA) Bean Validation Enterprise JavaBeansJavaMail API Java API for RESTful Web Services (JAX-RS) Java Persistence API (JPA) Contexts and Dependency Injection (CDI) Java Servlets Java Authentication and Authorization Service (JAAS) Java Authorization Contract for Containers (JACC)
- 22. @CesarHgt @tomitribejugbaq.org New to TomEE? https://www.katacoda.com/cesarhernandezgt/scenarios/1
- 23. @CesarHgt @tomitribejugbaq.org https://start.microprofile.io Hola mundo 1. unzip demo 2. cd demo 3. mvn package tomee:run 4. http://localhost:8080/data/hello 5. Revisa la estructura del proyecto en tu IDE.
- 24. @CesarHgt @tomitribejugbaq.org ● Command-line Interface ● Visual Studio Code extension start.microprofile.io https://microprofile.io/2019/07/08/command-line-interface-for-microprofile-starter-is-available-now/ https://microprofile.io/2019/09/17/announcing-visual-studio-code-extension-for-microprofile-starter/ https://www.tomitribe.com/blog/how-to-create-a-microservice-with-eclipse-microprofile-and-apache-tomee/
- 26. @CesarHgt @tomitribejugbaq.org Eclipse MicroProfile MicroProfile 3.3 JAX-RS 2.1JSON-P 1.1CDI 2.0 Config Fault Tolerance JWT Propagation HealthMetrics Open Tracing Open API Rest Client JSON-B 1.0 ● Why? ● How? ● Code ● Integrate
- 28. @CesarHgt @tomitribejugbaq.org Health Feature ● Probes state of services and resources. ● Infrastructure benefits ● It’s intended as a machine to machine (M2M) mechanism ● Examples: CloudFoundry Health Checks and Kubernetes Liveness and Readiness Probes.
- 29. @CesarHgt @tomitribejugbaq.org Familiarize yourself with the API ● Default endpoints: ○ http://host:port/health ○ http://host:port/<app-context>/health ● General output: ○ {"checks":[],"outcome":"UP","status":"UP"}
- 30. @CesarHgt @tomitribejugbaq.org { "status": "UP", "checks": [ { "name": "second-check", "status": "UP" } ] } Producer Consumer Health Check Procedure DB
- 31. @CesarHgt @tomitribejugbaq.org { "status": "UP", "checks": [ { "name": "spotify-service", "status": "UP", "data": { "key": "foo", "foo": "bar" } }, { "name": "db-check", "status": "UP" } ] } Producer Consumer DB Service
- 32. @CesarHgt @tomitribejugbaq.org ¿Cómo puedo seguir aprendiendo?
- 33. @CesarHgt @tomitribejugbaq.org Recursos de ayuda ● https://microprofile.io/ ● https://tomee.apache.org/ ● https://github.com/apache/tomee ● https://www.tomitribe.com/blog/category/microprofile/ ● https://kodnito.com/posts/building-an-api-backend-with-microprofile- ebook/
- 34. @CesarHgt @tomitribejugbaq.org Descargar los Ejemplos 1. wget https://github.com/apache/tomee/archive/tomee-8.0.2.zip 2. unzip tomee-8.0.2.zip 3. cd tomee-tomee-8.0.2/examples/ 4. cesar:examples$ ll -d mp-* mp-config-example/ mp-faulttolerance-timeout/ mp-metrics-gauge/ mp-rest-client/ mp-config-source-database/ mp-jsonb-configuration/ mp-metrics-histogram/ mp-rest-jwt/ mp-custom-healthcheck/ mp-jwt-bean-validation/ mp-metrics-metered/ mp-rest-jwt-jwk/ mp-faulttolerance-fallback/ mp-jwt-bean-validation-strongly-typed/ mp-metrics-timed/ mp-rest-jwt-principal/ mp-faulttolerance-retry/ mp-metrics-counted/ mp-opentracing-traced/ mp-rest-jwt-public-key/ Descripciones de los ejemplos: https://tomee.apache.org/tomee-8.0/examples/
- 36. @CesarHgt @tomitribejugbaq.org ● External configuration ● Cloud Native development lifecycle ● Influences and History ○ DeltaSpike Config (http://deltaspike.apache.org/documentation/configuration.html) ○ Extracted parts of DeltaSpike Config (https://github.com/struberg/javaConfig/) ○ Apache Tamaya (http://tamaya.incubator.apache.org/) MicroProfile Configuration
- 37. @CesarHgt @tomitribejugbaq.org MicroProfile config examples import org.eclipse.microprofile.config.inject.ConfigProperty; @Inject @ConfigProperty(name = "injected.value") private String value; @Inject @ConfigProperty(name = "app.year", defaultValue = "2020") private int year;
- 38. @CesarHgt @tomitribejugbaq.org ● Where to store configurations? ○ The default config sources always available by default are: ■ System properties (ordinal=400) ■ Environment properties (ordinal=300) ■ /META-INF/microprofile-config.properties (ordinal=100) ○ The priority will be used to order the ConfigSource implementations to search for the configuration key. MicroProfile Configuration
- 40. @CesarHgt @tomitribejugbaq.org Telemetry ● Unified Monitoring data ("Telemetry") ● Unified Java API ● Polyglot environment ● Open standards API path
- 41. @CesarHgt @tomitribejugbaq.org Difference to health checks ● Health checks ○ "Is my application still running ok?". ● Metrics: ○ Determine the overall the microservices health. ○ Provide long term trend data.
- 42. @CesarHgt @tomitribejugbaq.org ● Application Scope Rest endpoint ● Metrics aggregation services ● Metrics types: ○ @Counted ○ @Gauge ○ @Metered Metrics API ○ @Timed ○ Histogram
- 43. @CesarHgt @tomitribejugbaq.org Metrics aggregation services
- 44. @CesarHgt @tomitribejugbaq.org Ejemplo de Metrics
- 46. @CesarHgt @tomitribejugbaq.org What is JWT? ● Stands for JSON Web Token. ● It’s a JSON-based text format for exchanging information between parties. ● It’s an open standard specified under RFC 7519. ● Standards such as OpenID Connect and OAuth 2 use JWT to represent their own tokens.
- 48. @CesarHgt @tomitribejugbaq.org ● Standard ● Interoperability across the enterprise and vendors that favors microservices development. ● JWT can be both verified and propagated by each microservice. Why do we need MicroProfile JWT?
- 49. @CesarHgt @tomitribejugbaq.org MicroProfile JWT big picture
- 50. @CesarHgt @tomitribejugbaq.org JsonWebToken import javax.ws.rs.Path; import javax.enterprise.context.RequestScoped; import javax.inject.Inject; import org.eclipse.microprofile.jwt.JsonWebToken; @Path("/pizza") @RequestScoped public class PizzaEndpoint { @Inject private JsonWebToken callerPrincipal; @Inject @Claim("address") // Custom claim private JsonObject address;
- 51. @CesarHgt @tomitribejugbaq.org ● Cons ○ Base64 encoding isn’t encryption ○ Larger Payload ○ Token Expiration ● Pros ○ JSON ○ Speed and Reliability ○ Secure ○ Claims The Pros and Cons to using JWT
- 53. @CesarHgt @tomitribejugbaq.org MicroProfile Fault Tolerance
- 54. @CesarHgt @tomitribejugbaq.org The Rise of Resilience and Eventual Consistency ● Distributed systems ● All-or-nothing approach. ● Resilience ● Design patterns under the Fault Tolerance umbrella: ○ Bulkhead – isolate failures in part of the system. ○ Circuit breaker – offer a way to fail fast. ○ Retry – define criteria on when to retry. ○ Fallback – provide an alternative solution for a failed execution. ○ Timeout
- 55. @CesarHgt @tomitribejugbaq.org @Timeout @Retry import org.eclipse.microprofile.faulttolerance.Timeout; @Timeout(500) public String callSomeServiceLogic() {...} @Retry(retryOn = IOException.class) public String callSomeServiceLogic() {...} @Timeout(500) @Retry(maxRetries = 1) public String callSomeService() {...}
- 56. @CesarHgt @tomitribejugbaq.org Creando Microservicios con Java, MicroProfile y TomEE Thank you