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Functional microservices with Java EE
This document discusses using JavaEE technologies to implement microservices. It begins by defining microservices and their advantages and disadvantages compared to monolithic applications. It then discusses how to take an iterative, pragmatic approach to refactoring an existing JavaEE application into microservices by extracting existing services and having new services communicate with the monolith. The document provides examples of JavaEE implementations that can be used to build microservices and demonstrates a sample microservices application built with Payara Micro using JavaEE and Microprofile technologies. It discusses considerations for configuring, handling faults, and deploying microservices built in this way.
Functional microservices with Java EE
- 1. Functional microservices withJavaEE V´ıctor Orozco - @tuxtor February 22, 2018 GuateJUG 1
- 2. About • SW Developer/Engi- neer/Architect •Oracle Workforce Trainer/Edx Micromasters • Jug Leader GuateJUG • @tuxtor • http://vorozco.com 2
- 3. Zen State Zen =Stakeholders don’t call you, unless it’s your birthday • Productivity • HR Availability • Stability and predictability • Scalability • Money 3
- 4. Zen State Some sprintsago I had ”birthdays” on daily basis 4
- 5. How my birthdaysstarted Please V´ıctor help us to do Microservices 5
- 6. !Birthday Please V´ıctor helpus to choose a well known language, with a well known framework, for achieving great stability, spending the least money, and take advantage of our existing codebase. 6
- 7. Lesson 1: Microservicesare a mindset revolution
- 8. Monolith Figure 1: Regularmonolith - Credits: Markus Eisele 7
- 9. ESB Figure 2: ESB- Credits: Markus Eisele 8
- 10. Microservices Figure 3: Microservices- Credits: Markus Eisele 9
- 11. Microservices Advantages • Small codebases •Better software practices • Fault tolerance • Scalability Disadvantages • Tooling overhead • Debugging • Distributed transactions • Latency • Dependency 10
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- 13. Lesson 2: FunctionalMicroservices are not the same for everybody
- 14. How POC from Sr.to Jr. • Vert.x • Spring Boot • DropWizard • Akka • NodeJS . . . • JavaEE 12
- 15. J2EE Jobs J2EE Guatemala2018 13
- 16. HR • From thetop five universities at country only three teach Java properly • The other two teach .NET • Sillicon Valley off-shores take best developers 14
- 17. Lesson 3: Youdon’t need to be 100% ”microservice compliant”
- 18. Microservices - JavaEE JavaEEis one of the most anti-hype frameworks J2EE 1.2 (December 12, 1999) 15
- 19. Microservices - JavaEE Implementation •Iterative refactoring - Do it by waves • Practical refactoring - Extract an already existing service • New services - New services talk to monolith 16
- 20. Microservices - JavaEE Figure4: JavaEE technologies - Credits: Reza Rahman 17
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- 24. Microservices - Implementations •Wildfly Swarm • KumuluzEE • Open Liberty • TomEE • Payara Micro 21
- 25. Microservices - Payara Currenttarget: Microprofile 1.2 • Microprofile 1.2 • JavaEE Web Profile • JCache New deployments • Micro JavaEE server (CLI) • Uber-Jar/Fat-Jar 22
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- 27. JavaEE Micro -Demo Java 8, JAX-RS, CDI, EJB, Microprofile https://github.com/tuxtor/payara-demo https://github.com/tuxtor/omdb-demo 23
- 28. Payara Micro -Traditional JavaEE Granted • EJB • JTA • JAX-RS • CDI 24
- 29. Payara Micro -Micro JavaEE MicroProfile: JAX-RS, CDI (Per service), Config, Fault Tolerance Implementation: EJB, JTA (Per service) Todo: Location, Deployment, Orchestation, Balancing, Consistency, Patterns 25
- 30. Config @Inject @ConfigProperty (name ="omdbservice.url") String omdbDaemonServiceUrl ; 26
- 31. Fault tolerance • CircuitBreaker • Bulkhead • Fallback • Retry • Timeout 27
- 32. Fault tolerance -Fallback, Timeout @GET @Path("/{id:[a-z]*[0 -9][0 -9]*}") @Fallback(fallbackMethod = " findByIdFallBack ") @Timeout(TIMEOUT) public Response findById(@PathParam("id") final String imdbId) { ... } public Response findByIdFallBack (@PathParam("id") final String imdbId) { ... } 28
- 33. Thank you • me@vorozco.com •http://vorozco.com • http://github.com/tuxtor/slides This work is licensed under a Creative Commons Attribution-ShareAlike 3.0 Guatemala License. 29