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Others Talk,
We Listen.
Down-to-Earth
Microservices
with Java EE
Reza Rahman
Senior Architect
rrahman@captechconsulting.com
@reza_rahman
CapTech
Full-service US national IT consulting firm that focuses on client best interests,
trust, servant leadership, culture, professionalism and technical excellence.
#28 in Vault's Consulting Top 50
#3 Best Consulting Internship
#9 Best Overall Internship
#1 in Meeting Client’s Needs
#7 Best Firm to Work For
#1 in Career Development
Ranked for the
7th
Consecutive Year
Copyright © 2015 CapTech Ventures, Inc. All rights reserved.
Agenda
• What exactly are microservices?
• Are microservices for you?
• Microservices and Java EE
Copyright © 2015 CapTech Ventures, Inc. All rights reserved.
What’s in a Name?
• “Microservices” very vague
• Big hurdle to practical adoption by average Joe developer
• Poor naming regime, including “monolith”
• Overloaded by commercial interests
• Simple concept with a long history
• UNIX, CORBA, Jini, RMI, EJB 1/2, COM/DCOM, OSGi, SOAP/ESB
• An intellectually honest name could be “Son of SOA”
Copyright © 2015 CapTech Ventures, Inc. All rights reserved.
What’s in a Name?
• Decomposing larger systems into smaller independently deployable
parts
• Purists distance themselves from SOAP, ESB
• Purists embrace mostly REST and messaging
• Purists take for granted testing, DevOps, continuous delivery
• Purists focus on (ridiculously) fine grained services
Copyright © 2015 CapTech Ventures, Inc. All rights reserved.
The Promise
• As systems grow, they become harder to maintain without modularity
• Ideal size for “monolithic” team is somewhere around 10-12 engineers
• Distributed systems can enforce better modularity
• Greater agility – maybe
• Easier to scale – maybe
• Polyglot programming – maybe
Copyright © 2015 CapTech Ventures, Inc. All rights reserved.
The Reality
• Long well-understood downsides of distributed systems
• Significantly more complex administration, deployment and monitoring
• Significantly harder testing, debugging, diagnostics, reliability,
consistency
• Code duplication - the challenges of finding module boundaries
• Higher skill and automation requirements for development and operations
• “Distributed big ball of mud”
• “Fallacies of distributed computing”
Copyright © 2015 CapTech Ventures, Inc. All rights reserved.
The Reality
• The Bottom Line
• Majority of systems probably just fine as “monoliths”
• Majority of systems needing microservices would be considered “hybrids”
by purists
• Few practical enterprise systems can or need to achieve “microservices
nirvana”
• Business and system needs most of the time make decomposition lines
obvious
Copyright © 2015 CapTech Ventures, Inc. All rights reserved.
DDD
Bounded
Context
A Picture Says a Thousand Words…
For most ordinary “blue collar” IT organizations “microservices nirvana” is
probably more like microservices hell.
Copyright © 2015 CapTech Ventures, Inc. All rights reserved.
Microservices and Vanilla Java EE
Copyright © 2015 CapTech Ventures, Inc. All rights reserved.
JAX-RSJAX-RS
JSFJSF
JMSJMS WebSocketWebSocket
JSONJSON
CDICDI
Bean
Validation
Bean
Validation
EJB 3EJB 3 JPAJPA
AdministrationAdministration
MonitoringMonitoring
High
Availability
High
Availability SecuritySecurity
ResourcesResources
Pragmatic Java EE Microservices Demo
https://github.com/m-reza-rahman/javaee-pragmatic-microservices
Copyright © 2015 CapTech Ventures, Inc. All rights reserved.
Microservices Buzzword Bingo
• Fat jars, uber jars, “containerless”, microframeworks
• WildFly Swarm, Payara Micro, WebSphere Liberty, KumuluzEE, TomEE
embedded, Spring Boot
• Containers
• Docker
• Cloud, IaaS, PaaS
• AWS, OpenShift, Oracle Cloud, BlueMix, Cloud Foundry
• Dynamic discovery, client-side load-balancing, circuit-breakers/bulkheads,
health-check/metrics
• Ribbon, Hystrix, RxJava, NetFlixOSS
Copyright © 2015 CapTech Ventures, Inc. All rights reserved.
Microservices and Java EE
Copyright © 2015 CapTech Ventures, Inc. All rights reserved.
http://microprofile.io
Java EE 9
• Dynamic configuration, health-check, OAuth, OpenID
• Fat jars, Java SE 9 modules
• Dynamic discovery, circuit-breakers/bulkheads/client-side load-balancing
• NoSQL, state management, eventual consistency, events
Copyright © 2015 CapTech Ventures, Inc. All rights reserved.
Summary
• Microservices newest incarnation of ideas with a long history, the last major
incarnation being SOA.
• Microservices is a valuable architectural technique that is pretty technology
agnostic.
• Microservices are not necessarily for everyone, not necessary always and not
necessarily all-at-once.
• Vanilla Java EE is a very capable platform for pragmatic microservices more
relevant to ordinary IT organizations, “monoliths” and everything in between.
• The Java EE ecosystem is already stepping up to support even the niche of
microservices nirvana.
Copyright © 2015 CapTech Ventures, Inc. All rights reserved.
Resources
• Microservices Premium by Martin Fowler
• https://martinfowler.com/bliki/MicroservicePremium.html
• Microservices is SOA, for those who know what SOA is
• http://service-architecture.blogspot.com/2014/03/microservices-is-soa-for-those
• Java EE Tutorials
• http://docs.oracle.com/javaee/7/tutorial/doc/home.htm
• Pragmatic Microservices Lab
• https://github.com/m-reza-rahman/pragmatic-microservices-lab
Copyright © 2015 CapTech Ventures, Inc. All rights reserved.
Copyright©2015CapTechVentures,Inc.Allrightsreserved.

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Down-to-Earth Microservices with Java EE

  • 1. Others Talk, We Listen. Down-to-Earth Microservices with Java EE Reza Rahman Senior Architect rrahman@captechconsulting.com @reza_rahman
  • 2. CapTech Full-service US national IT consulting firm that focuses on client best interests, trust, servant leadership, culture, professionalism and technical excellence. #28 in Vault's Consulting Top 50 #3 Best Consulting Internship #9 Best Overall Internship #1 in Meeting Client’s Needs #7 Best Firm to Work For #1 in Career Development Ranked for the 7th Consecutive Year Copyright © 2015 CapTech Ventures, Inc. All rights reserved.
  • 3. Agenda • What exactly are microservices? • Are microservices for you? • Microservices and Java EE Copyright © 2015 CapTech Ventures, Inc. All rights reserved.
  • 4. What’s in a Name? • “Microservices” very vague • Big hurdle to practical adoption by average Joe developer • Poor naming regime, including “monolith” • Overloaded by commercial interests • Simple concept with a long history • UNIX, CORBA, Jini, RMI, EJB 1/2, COM/DCOM, OSGi, SOAP/ESB • An intellectually honest name could be “Son of SOA” Copyright © 2015 CapTech Ventures, Inc. All rights reserved.
  • 5. What’s in a Name? • Decomposing larger systems into smaller independently deployable parts • Purists distance themselves from SOAP, ESB • Purists embrace mostly REST and messaging • Purists take for granted testing, DevOps, continuous delivery • Purists focus on (ridiculously) fine grained services Copyright © 2015 CapTech Ventures, Inc. All rights reserved.
  • 6. The Promise • As systems grow, they become harder to maintain without modularity • Ideal size for “monolithic” team is somewhere around 10-12 engineers • Distributed systems can enforce better modularity • Greater agility – maybe • Easier to scale – maybe • Polyglot programming – maybe Copyright © 2015 CapTech Ventures, Inc. All rights reserved.
  • 7. The Reality • Long well-understood downsides of distributed systems • Significantly more complex administration, deployment and monitoring • Significantly harder testing, debugging, diagnostics, reliability, consistency • Code duplication - the challenges of finding module boundaries • Higher skill and automation requirements for development and operations • “Distributed big ball of mud” • “Fallacies of distributed computing” Copyright © 2015 CapTech Ventures, Inc. All rights reserved.
  • 8. The Reality • The Bottom Line • Majority of systems probably just fine as “monoliths” • Majority of systems needing microservices would be considered “hybrids” by purists • Few practical enterprise systems can or need to achieve “microservices nirvana” • Business and system needs most of the time make decomposition lines obvious Copyright © 2015 CapTech Ventures, Inc. All rights reserved. DDD Bounded Context
  • 9. A Picture Says a Thousand Words… For most ordinary “blue collar” IT organizations “microservices nirvana” is probably more like microservices hell. Copyright © 2015 CapTech Ventures, Inc. All rights reserved.
  • 10. Microservices and Vanilla Java EE Copyright © 2015 CapTech Ventures, Inc. All rights reserved. JAX-RSJAX-RS JSFJSF JMSJMS WebSocketWebSocket JSONJSON CDICDI Bean Validation Bean Validation EJB 3EJB 3 JPAJPA AdministrationAdministration MonitoringMonitoring High Availability High Availability SecuritySecurity ResourcesResources
  • 11. Pragmatic Java EE Microservices Demo https://github.com/m-reza-rahman/javaee-pragmatic-microservices Copyright © 2015 CapTech Ventures, Inc. All rights reserved.
  • 12. Microservices Buzzword Bingo • Fat jars, uber jars, “containerless”, microframeworks • WildFly Swarm, Payara Micro, WebSphere Liberty, KumuluzEE, TomEE embedded, Spring Boot • Containers • Docker • Cloud, IaaS, PaaS • AWS, OpenShift, Oracle Cloud, BlueMix, Cloud Foundry • Dynamic discovery, client-side load-balancing, circuit-breakers/bulkheads, health-check/metrics • Ribbon, Hystrix, RxJava, NetFlixOSS Copyright © 2015 CapTech Ventures, Inc. All rights reserved.
  • 13. Microservices and Java EE Copyright © 2015 CapTech Ventures, Inc. All rights reserved. http://microprofile.io
  • 14. Java EE 9 • Dynamic configuration, health-check, OAuth, OpenID • Fat jars, Java SE 9 modules • Dynamic discovery, circuit-breakers/bulkheads/client-side load-balancing • NoSQL, state management, eventual consistency, events Copyright © 2015 CapTech Ventures, Inc. All rights reserved.
  • 15. Summary • Microservices newest incarnation of ideas with a long history, the last major incarnation being SOA. • Microservices is a valuable architectural technique that is pretty technology agnostic. • Microservices are not necessarily for everyone, not necessary always and not necessarily all-at-once. • Vanilla Java EE is a very capable platform for pragmatic microservices more relevant to ordinary IT organizations, “monoliths” and everything in between. • The Java EE ecosystem is already stepping up to support even the niche of microservices nirvana. Copyright © 2015 CapTech Ventures, Inc. All rights reserved.
  • 16. Resources • Microservices Premium by Martin Fowler • https://martinfowler.com/bliki/MicroservicePremium.html • Microservices is SOA, for those who know what SOA is • http://service-architecture.blogspot.com/2014/03/microservices-is-soa-for-those • Java EE Tutorials • http://docs.oracle.com/javaee/7/tutorial/doc/home.htm • Pragmatic Microservices Lab • https://github.com/m-reza-rahman/pragmatic-microservices-lab Copyright © 2015 CapTech Ventures, Inc. All rights reserved.