Creando microservicios con Java y Microprofile - Nicaragua JUG
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César Hernández, a senior software engineer and Java champion, delivers a presentation on creating microservices using Java and Eclipse MicroProfile. The agenda covers topics such as microservices architecture, configuration, health checks, and fault tolerance patterns within MicroProfile. The document also highlights the adoption of microservices, with statistics on developer usage and resources for further learning.
![@CesarHgt @tomitribe@jugnicaragua
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/creandomicroserviciosconjavamicroprofile-200512214922/85/Creando-microservicios-con-Java-y-Microprofile-Nicaragua-JUG-35-320.jpg)
![@CesarHgt @tomitribe@jugnicaragua
{
"status": "UP",
"checks": [
{
"name": "second-check",
"status": "UP"
}
]
}
Producer Consumer
Health
Check
Procedure
DB](https://image.slidesharecdn.com/creandomicroserviciosconjavamicroprofile-200512214922/85/Creando-microservicios-con-Java-y-Microprofile-Nicaragua-JUG-36-320.jpg)
![@CesarHgt @tomitribe@jugnicaragua
{
"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/creandomicroserviciosconjavamicroprofile-200512214922/85/Creando-microservicios-con-Java-y-Microprofile-Nicaragua-JUG-37-320.jpg)
Creando microservicios con Java y Microprofile - Nicaragua JUG
- 1. @CesarHgt @tomitribe@jugnicaragua César Hernández Creando Microservicios con Java y Eclipse MicroProfile
- 2. @CesarHgt @tomitribe@jugnicaragua 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
- 3. @CesarHgt @tomitribe@jugnicaragua Agenda ● Introduction and setup ● Microservices ● Eclipse MicroProfile ● MicroProfile Configuration ● MicroProfile Health ● MicroProfile Metrics ● MicroProfile JWT ● MicroProfile Fault Tolerance ●
- 5. @CesarHgt @tomitribe@jugnicaragua 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
- 6. @CesarHgt @tomitribe@jugnicaragua ● Infraestructura ● Arquitectura ● Investigación Perspectivas Micro Servicios
- 8. @CesarHgt @tomitribe@jugnicaragua ● Alcance ● Distribuídos ● Orquestación ● Adopción Retos Microservices
- 9. @CesarHgt @tomitribe@jugnicaragua Microservices Patterns teaches enterprise developers and architects how to build applications with the microservice architecture. — Chris Richardson
- 10. @CesarHgt @tomitribe@jugnicaragua Patrones Microservices Source: http://eventuate.io/exampleapps.html
- 11. @CesarHgt @tomitribe@jugnicaragua ● 46% of organizations are already building microservices ● 20% of organizations plan to build microservices in the next year ● 45% of developers are using Java to build microservices ● 21% of developers plan to use Java to build microservices in the next year ● 15% of developers have already adopted MicroProfile Microservices and Cloud-native Source: Jakarta EE Developer Survey 2018 - The Eclipse Foundation’s global survey of 1,800 Java developers.
- 13. @CesarHgt @tomitribe@jugnicaragua 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 @tomitribe@jugnicaragua 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
- 16. @CesarHgt @tomitribe@jugnicaragua Eclipse foundation, EE4J, JavaEE, and JakartaEE
- 19. @CesarHgt @tomitribe@jugnicaragua ● Apache Tomcat + Java EE = Apache TomEE ● Built from Apache components ● MicroProfile compliant ● Footprint: 30MB zip, 100~MB memory ● JakartaEE 9 WIP ● tomee.apache.org
- 20. @CesarHgt @tomitribe@jugnicaragua TomEE JAX-RS (~ Microprofile)
- 21. @CesarHgt @tomitribe@jugnicaragua New to TomEE? https://www.katacoda.com/cesarhernandezgt/scenarios/1
- 22. @CesarHgt @tomitribe@jugnicaragua https://start.microprofile.io Hola mundo 1. unzip demo 2. cd demo 3. mvn package tomee:run 4. http://localhost:8080/data/hello 5. Review the project structure in your IDE.
- 23. @CesarHgt @tomitribe@jugnicaragua ● 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/
- 25. @CesarHgt @tomitribe@jugnicaragua Eclipse MicroProfile ● Why? ● How? ● Code ● Integrate
- 27. @CesarHgt @tomitribe@jugnicaragua ● 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
- 28. @CesarHgt @tomitribe@jugnicaragua 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;
- 29. @CesarHgt @tomitribe@jugnicaragua ● 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
- 30. @CesarHgt @tomitribe@jugnicaragua ¿Cómo puedo seguir aprendiendo?
- 31. @CesarHgt @tomitribe@jugnicaragua 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/
- 32. @CesarHgt @tomitribe@jugnicaragua Descargar los Ejemplos 1. wget https://github.com/apache/tomee/releases/tag/tomee-8.0.1 2. unzip tomee-8.0.1.zip 3. cd tomee-tomee-8.0.1/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/
- 34. @CesarHgt @tomitribe@jugnicaragua 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.
- 35. @CesarHgt @tomitribe@jugnicaragua Familiarize yourself with the API ● Default endpoints: ○ http://host:port/health ○ http://host:port/<app-context>/health ● General output: ○ {"checks":[],"outcome":"UP","status":"UP"}
- 36. @CesarHgt @tomitribe@jugnicaragua { "status": "UP", "checks": [ { "name": "second-check", "status": "UP" } ] } Producer Consumer Health Check Procedure DB
- 37. @CesarHgt @tomitribe@jugnicaragua { "status": "UP", "checks": [ { "name": "spotify-service", "status": "UP", "data": { "key": "foo", "foo": "bar" } }, { "name": "db-check", "status": "UP" } ] } Producer Consumer DB Service
- 39. @CesarHgt @tomitribe@jugnicaragua Telemetry ● Unified Monitoring data ("Telemetry") ● Unified Java API ● Polyglot environment ● Open standards API path
- 40. @CesarHgt @tomitribe@jugnicaragua Difference to health checks ● Health checks ○ "Is my application still running ok?". ● Metrics: ○ Determine the overall the microservices health. ○ Provide long term trend data.
- 41. @CesarHgt @tomitribe@jugnicaragua ● Application Scope Rest endpoint ● Metrics aggregation services ● Metrics types: ○ @Counted ○ @Gauge ○ @Metered Metrics API ○ @Timed ○ Histogram
- 43. @CesarHgt @tomitribe@jugnicaragua Ejemplo de Metrics
- 45. @CesarHgt @tomitribe@jugnicaragua 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.
- 47. @CesarHgt @tomitribe@jugnicaragua ● 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?
- 48. @CesarHgt @tomitribe@jugnicaragua MicroProfile JWT big picture
- 49. @CesarHgt @tomitribe@jugnicaragua 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;
- 50. @CesarHgt @tomitribe@jugnicaragua ● Cons ○ Base64 encoding isn’t encryption ○ Larger Payload ○ Token Expiration ● Pros ○ JSON ○ Speed and Reliability ○ Secure ○ Claims The Pros and Cons to using JWT
- 52. @CesarHgt @tomitribe@jugnicaragua MicroProfile Fault Tolerance
- 53. @CesarHgt @tomitribe@jugnicaragua 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
- 54. @CesarHgt @tomitribe@jugnicaragua @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() {...}
- 55. @CesarHgt @tomitribe@jugnicaragua Creando Microservicios con Java y Eclipse MicroProfile Thank you