Building Microservices with Micronaut: A Full-Stack JVM-Based Framework

1. BUILDING MICROSERVICESBUILDING MICROSERVICES WITH MICRONAUTWITH MICRONAUT ORACLE CODE ONEORACLE CODE ONE September 18, 2019September 18, 2019 Michael P. RedlichMichael P. Redlich 1 . 1

2. WHO'S MIKE?WHO'S MIKE? Bachelor of Science, Computer Science from Senior Research Technician, petrochemical research organization Java Queue News Editor, Past President, (ACGNJ) Founder & Co-Facilitator, Rutgers University InfoQ Amateur Computer Group of New Jersey ACGNJ Java Users Group 1 . 2

3. OBJECTIVESOBJECTIVES What is Micronaut? Features Why Micronaut? JVM Language Support Getting Started Live Demo 2

4. WHAT IS MICRONAUT?WHAT IS MICRONAUT? A full-featured, full-stack JVM-based lightweight application framework for creating microservice- based, cloud-native and serverless applications that can be written in Java, Groovy, and Kotlin Developed at (OCI) , Principal Software Engineer and Grails and Micronaut Product Lead at OCI Object Computing, Inc. Graeme Rocher

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6. First introduced at the in March 2018 Designed from the ground up for microservices and serverless applications Latest version: 1.2.2 Greach Conference 3 . 2

7. PROJECTS (MODULES)PROJECTS (MODULES) Micronaut AWS Micronaut GCP Micronaut RabbitMQ Micronaut Test Micronaut for Spring Micronaut Security 3 . 3

8. Based on Ahead-of-Time compilation vs. runtime re ection runtime re ection has inherent memory and performance costs 3 . 4

9. FEATURESFEATURES HTTP SERVERHTTP SERVER Fully reactive and non-blocking HTTP server built on support for Reactor and Auto con guration for common databases Netty RxJava

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11. HTTP CLIENTHTTP CLIENT Declarative, reactive, compile-time HTTP client Automatic service discovery Automatic load balancing 4 . 2

12. Support for: (OpenAPI) Amazon Web Services Google Cloud Platform GraalVM GraphQL gRPC Swagger 4 . 3

13. Microservice patterns such as: service discovery distributed tracing circuit breaker 4 . 4

14. WHY MICRONAUT?WHY MICRONAUT? LET'S TRAVEL BACK IN TIME TO 2008LET'S TRAVEL BACK IN TIME TO 2008 Grails 1.0 released Applications were monoliths Before the advent of technologies such as: Angular React Docker Microservices

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16. Attempt to t monolith-focused framework into microservices environment Spring and Grails weren't designed for the micro- environment 5 . 2

17. Graeme RocherGraeme Rocher Grails & Micronaut Lead at OCIGrails & Micronaut Lead at OCI “We believe Micronaut is the basis for a framework for the future, by resolving this tension by eliminating all use of re ection and producing all annotation metadata, proxies and framework infrastructure at compilation time through a set of annotation processors and AST transformations that perform Ahead-of-Time (AOT) compilation. What this allows Micronaut to achieve is blazing fast startup time, low memory consumption and crucially improved compatibility with GraalVM native image.” 5 . 3

18. LANGUAGE AND BUILD TOOLSLANGUAGE AND BUILD TOOLS JVM LANGUAGESJVM LANGUAGES

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20. BUILD TOOLSBUILD TOOLS 6 . 2

21. GETTING STARTEDGETTING STARTED INSTALLING MICRONAUTINSTALLING MICRONAUT $ sdk install micronaut

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24. BUILT-IN PROFILESBUILT-IN PROFILES Generate skeleton, yet working, applications as aGenerate skeleton, yet working, applications as a building block for developing web or command linebuilding block for developing web or command line applicationsapplications create-app create-controller create-client 7 . 3

25. GENERATE AN INITIAL APPLICATIONGENERATE AN INITIAL APPLICATION Default Language: JavaDefault Language: Java $ mn create-app org.redlich.demo $ mn create-app org.redlich.demo --lang groovy $ mn create-app org.redlich.demo --lang kotlin 7 . 4

26. GENERATE AN INITIAL APPLICATIONGENERATE AN INITIAL APPLICATION Default Build Tool: GradleDefault Build Tool: Gradle $ mn create-app org.redlich.demo $ mn create-app org.redlich.demo --build maven 7 . 5

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28. GeneratedGenerated application.ymlapplication.yml lele micronaut: application: name: demo 7 . 7

29. GeneratedGenerated micronaut-cli.ymlmicronaut-cli.yml lele profile: service defaultPackage: org.redlich --- testFramework: junit sourceLanguage: java 7 . 8

30. GeneratedGenerated Application.javaApplication.java lele package org.redlich; import io.micronaut.runtime.Micronaut; public class Application { public static void main(String[] args) { Micronaut.run(Application.class); } } 7 . 9

31. $ ./gradlew run $ ./mvnw compile exec:exec 7 . 10

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33. $ mn create-controller HelloController 7 . 12

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35. GeneratedGenerated HelloController.javaHelloController.java lele package org.redlich; import io.micronaut.http.annotation.Controller; import io.micronaut.http.annotation.Get; import io.micronaut.http.HttpStatus; @Controller("/hello") public class HelloController { @Get("/") public HttpStatus index() { return HttpStatus.OK; } } 7 . 14

36. DEMO APPLICATIONDEMO APPLICATION A book inventory application built on three microservices Based on a written by , senior software engineer at OCI Uses , a distributed service mesh to connect, secure, and conﬁgure services across any runtime platform and public or private cloud tutorial Sergio del Amo Caballero Consul

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38. MICROSERVICESMICROSERVICES books microservice (Groovy) inventory microservice (Kotlin) gateway microservice (Java) 8 . 2

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40. BOOKS MICROSERVICE (GROOVY)BOOKS MICROSERVICE (GROOVY) $ mn create-app example.micronaut.books --lang groovy 8 . 4

41. INVENTORY MICROSERVICE (KOTLIN)INVENTORY MICROSERVICE (KOTLIN) $ mn create-app example.micronaut.inventory --lang kotlin 8 . 5

42. GATEWAY MICROSERVICE (JAVA)GATEWAY MICROSERVICE (JAVA) $ mn create-app example.micronaut.gateway 8 . 6

44. NY/NJ/PA JAVA USERS GROUPSNY/NJ/PA JAVA USERS GROUPS  ACGNJ Java Users Group facilitated by Mike Redlich & Barry Burd NYJavaSIG facilitated by Frank Greco javasig.org javasig.com

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46. PhillyJUG facilitated by Paul Burton, et.al. Princeton Java Users Group facilitated by Yakov Fain meetup.com/PhillyJUG meetup.com/NJFlex 10 . 2

47. FURTHER READINGFURTHER READING INFOQ TECHNICAL ARTICLESINFOQ TECHNICAL ARTICLES Sergio del Amo Caballero December 6, 2018 Sergio del Amo Caballero October 5, 2018 Micronaut Tutorial: Part 2: Easy Distributed Tracing, JWT Security and AWS Lambda Deployment Micronaut Tutorial: How to Build Microservices with This JVM- Based Framework

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49. INFOQ NEWSINFOQ NEWS May 14, 2019 December 31, 2018 October 19, 2018 Micronaut 1.1 Features Enhanced Support for Building Cloud- Native Applications Micronaut for Spring Allows Spring Boot Apps to Run as Micronaut Apps The Road to Micronaut 1.0: A JVM-Based Full-Stack Framework 11 . 2

50. UPCOMING ACGNJ JAVA USERSUPCOMING ACGNJ JAVA USERS GROUP MEETINGSGROUP MEETINGS Tuesday, October 8, 2019 Tuesday, October 22, 2019 Monday, November 18, 2019 Beautiful SDK Design in Java for APIs Reza Rahman Ray Tsang Micah Silverman 12

51. UPCOMING EVENTSUPCOMING EVENTS Monday-Friday, November 11-15, 2019 Hyatt Regency San Francisco QCon San Francisco 13

52. MICRONAUT RESOURCESMICRONAUT RESOURCES     Website Guides Documentation News 14

53. CONTACT INFOCONTACT INFO      redlich.net mike@redlich.net @mpredli slideshare.net/mpredli01 github.com/mpredli01/micronaut- bookstore 15

54. ACKNOWLEDGEMENTSACKNOWLEDGEMENTS Object Computing, Inc. Graeme Rocher Sergio del Amo Caballero 16

55. THANKS!THANKS! 17

Building Microservices with Micronaut: A Full-Stack JVM-Based Framework

Michael Redlich

Building Microservices with Micronaut: A Full-Stack JVM-Based Framework