June 2019 - Lightweight Microservices with Microprofile and Raspberry PIs

Our June event saw Tomitribe's Director of Engineering Jean-Louis Monteiro join us at Oracle Dublin Java User Group to share his knowledge of eclipse microprofile. Members went away with a solid understanding of lightweight microservices, and stateless microservice security via JWT, TomEE and MicroProfile.

FINEOS developer Boris Lulic won this month's platinum member prize - a year's subscription of IntelliJ.


Interested in meeting Java Rockstars? Check out our other Dublin Java User Group events - DubJUG.org


Additional Information

Session Abstracts

19:00 - Lightweight Microservices with Microprofile and Raspberry PIs

Microservices has been buzzword in the last years in software engineering. It helps to solve issues we had with monolith applications, however it also brings new challenges.

Eclipse MicroProfile provides a time to market set of specifications and tools addressing these many challenges. Jean-Louis will be looking on how to use these spec implementations in practice throughout this presentation and show step-by-step examples on how to add monitoring with MP Health and with MP Metrics, security with MP JWT, custom configuration with MP Config, and also teach how to easily provide documentation with MP OpenAPI and much more.

Lightweight will be achieved by deploying and running Docker on raspberry PIs.


Refreshments courtesy of the DubJUG Partners.


20:30 - Stateless Microservice Security via JWT, TomEE and MicroProfile

Microservices based architecture seems to be the common convergence point in the industry. But when it comes to security we are still struggling to evolve from monolithic systems or people oriented architecture. This presentation will be focusing on this landscape and explain how to leverage the quickly evolving MicroProfile JWT specification to secure Microservices and in a fully stateless and scalable manner. We’ll introduce the specification in a quick and no nonsense fashion and move on to several code examples that show how to setup JWT verification and obtain trusted claims via lookup or dependency injection. For our playground, we’ll be using Apache TomEE, fully open source lightweight Java EE server and MicroProfile implementation.

About Jean-Louis

Jean-Louis is Director of Engineering at Tomitribe, Member of the Apache Foundation, seasoned Architect and deeply passionate about Open Source.

His background is in banking, insurance, telecommunications, and public domain. His first contributions to Apache were implementing WS-Security in TomEE and is an active contributor to many other projects including OpenEJB, OpenWebBeans, Geronimo and Sirona.

He is involved in the Java Community Process (JCP) and is an active member of the EJB 3.2 expert group. He shares his knowledge by speaking at Java User Groups (JUG) and conferences such as ApacheCon Europe and Devoxx. His past experiences and present specialties include Spring, Hibernate, JPA, CDI, JSP, SOAP, RESTful services, WS-Security, Tapestry, Tomcat, IBM WebSphere, Java EE, SOA architecture and much more. And beyond his “normal” workday he also teaches Web Services, Java EE, and more at his local university in France.

If Jean-Louis is not coding or playing with his precious children, Luna, Luka and Luis, he is living his second life as a referee in the French National Handball League.

You can follow him on twitter at @JLouisMonteiro

About the Oracle Dublin Java User Group

The Oracle Dublin Java User Group, aka DubJUG, is Ireland's oldest JUG serving Java developers in Ireland. Since 2006, the Group has been bringing Java Champions, Java One Rock Stars, and Duke Award winners to Dublin for the benefit of our community of Java software professionals. Oracle is the current Headline Partner.

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DubJUG Partners

Our headline partner, Oracle is committed to offering choice, flexibility and a lower cost of computing for customers, and demonstrate this commitment by investing significant resources in developing, testing, optimizing, and supporting a wide variety of open source technologies.

For further details on some of the open source technologies in Oracle Cloud please visit developer.oracle.com/opensource

Oracle Cloud is the industry’s broadest and most integrated public cloud. It offers best-in-class services across software as a service (SaaS), platform as a service (PaaS), and infrastructure as a service (IaaS), and even lets you put Oracle Cloud in your own data centre. Oracle Cloud helps organisations drive innovation and business transformation by increasing business agility, lowering costs, and reducing IT complexity.

Website: Oracle / Twitter: Oracle_UKI


Version 1 is a trusted technology partner to major domestic and international customers across all industry sectors in the UK and Ireland. Their Java practice has grown to over 120 people over the last few years, and continues to grow. Many of their Java customers use a significant amount of open-source tools and technologies, and therefore Version 1 work with the community to hear other Java success stories, learn more about people’s experiences, and bring in Java experts and champions to get the latest on what’s going on in that space.”

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Stackand.Co enrich the professional lives of Java / Scala software professionals - with over 20 years experience in the Irish ICT market, they have helped many great people elevate their careers.

Perhaps they can do the same for you working with companies like this one?

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Global Payments Inc makes it easy for business to accept payments online, on mobile and in-app blending global coverage, local expertise and the best possible service to help drive business growth. Headquarted in Atlanta, they have a thriving technology division based on Sir John Rogerson's Quay.

Website: GlobalPaymentsInc.com / Twitter: GlobalPayInc


Equifax Technology Ireland is the Research and Development arm of global credit scoring organisation Equifax - it has recently opened a technology centre in the Bloodstone Building, Dublin 2.

Now looking for developers!

Website: Equifax.com / Twitter: Equifax


GuruTeam delivers high end ICT learning, mentoring and consultancy services, in Ireland, the UK and worldwide. Their expert instructors formulate bespoke training to suit their clients and can deliver programmes on or offsite.

Website: GuruTeamIrl.com / Twitter: GuruTeamIreland


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