We're back to get 2026 ignited not with a flame, but an explosion. January sees not one, not two, but three Java Champions visiting Dublin as we again join forces with the JChampions conference to bring you the best!

The third and final visitor coming to present his JChampions talk, Optimizing Santa's travels in Java with Timefold, live in-person on the evening of January 27th is BeJUG host Tom Cools.

Tom also presents a special bonus talk for our attendees "Braving the Change: Recalibrating to new realities," which he recently presented at Devoxx in Belgium.

We're back to get 2026 ignited not with a flame, but an explosion. January sees not one, not two, but three Java Champions visiting Dublin as we again join forces with the JChampions conference to bring you the best!

First up is author extraordinaire Cay Horstmann, live in-person on the evening of January 22nd as he presents his JChampions talk plus a special bonus talk for our attendees.

Join author and Java Champion Dr. Michael Hüttermann on December 12th at our Xmas event live in-person at Techmeetup.space, tcube workspaces.

We're privileged and fortunate to welcome Bruno Souza back to the Dublin Java User Group the evening of November 19th. Bruno is known worldwide helping Java developers accelerate their careers beyond coding. It's a night not to be missed if you're in a rut, want inspirational strategies to get ahead, or even to become a Java rockstar yourself!

Join Rogerio Robetti, to learn how Open J proxy can make a real difference in resource management, stability, and scalability of your Java apps, AND Mike Redlich who will run you through Jakarta 11 and 12.

We had an amazing event in Squarespace's Dublin HQ with insightful talks from their team lead AJ Rogers and Azul Systems - request video ⤵️

Author and world renowned open source contributor Haoyi Li visited the Dublin Java User group on 22nd May on a rare visit to Dublin.

At this event Haoyi discussed how the experimental build tool "Mill" bridges the gaps of Maven and Gradle, followed by a deep dive into some techniques the Mill build tool uses to optimize developer experience. Full details below, along with a recording of the event.

Check out our [next event here >>>](https://ti.to/dublin-java-user-group/)

On a rare visit to Dublin by Nicolas Fränkel, we learned about OpenTelemetry Tracing, along with a walkthrough of End-to-End Pull Request Testing on Kubernetes.

As always, drinks and pizza were provided courtesy of our premier partners, Integral Ad Science, Stackand.Co Recruiters and FINEOS.

FULL TALK DETAILS BELOW ⤵️

We joined Azul Systems FOOJAY and DubJUG on the evening of Thursday 13th March for DubJUG's Watch Party of Duke Turns 30, a celebrating 30 years of Java

We joined on the evening of Thursday 27th February as author of Software Architecture for Developers, and creator of the C4 Software Architecture Model, Simon Brown delivered two great talks live, in-person.

ABSTRACTS BELOW ⤵️

We joined on the evening of Monday 27th January as Dutch based Brazilian Java Champion, Elias Nogueira delivered two great Java testing talks, one of which was streamed worldwide as part of the JChampions Conference 2025.

ABSTRACTS BELOW ⤵️

We joined on the evening of Friday 24th January as Java Champion Rafael Del Nero delivered two great Java talks, one of which was streamed worldwide as part of the JChampions Conference 2025.

ABSTRACTS BELOW ⤵️

We joined on the evening of Thursday 23rd January as Swiss software consultant and Java Champion delivered two great Java talks, one of which was streamed worldwide as part of the JChampions Conference 2025.

ABSTRACTS BELOW ⤵️

We joined on the evening of Tuesday 26th November as UK software consultant and open source committer, Dan Haywood, shared a live coding experience with Apache Causeway.

ABSTRACTS BELOW ⤵️

We joined on "Friday" evening of 8th November as Java Champion Otavio Santana returns to the Dublin Java User Group along with Juarez Barbosa Junior.

ABSTRACTS BELOW ⤵️

On the run up to Halloween 2024, Java Champion Steve Poole made a long-awaited return to the Dublin Java User Group to scare the bejesus out of you, the java developer.

ABSTRACTS BELOW ⤵️

We joined in Integral Ad Sciences new Dublin HQ on the evening of Wednesday 25th September as their Senior Staff Engineer, Samuel Teixeira, presents **Replatforming a High-Throughput Microservice: From Bare Metal to Cloud with Spring WebFlux and Kubernetes.**

ABSTRACTS BELOW ⤵️

This month, we welcomed long-time open source committer Sergey Beryozkin to the Dublin Java User Group. Currently working at Red Hat, Sergey has a deep interest in OpenId Connect and JSON Web Token (JWT) security.

ABSTRACTS BELOW ⤵️

It had been several years since we last had the great pleasure of welcoming Juarez Barbosa Junior to the Dublin Java User Group. On that occasion, we welcomed him back for a session on blazingly fast GenAI app development using Spring AI.

ABSTRACTS BELOW ⤵️

We welcomed local Brasilian developer Igor De Souza for a night of Kafka fun!

ABSTRACTS BELOW ⤵️

On the evening of Tuesday January 30th we welcomed Dublin based Java Champion Rafael Del Nero to the Dublin Java User Group at TechMeetup.space in the city centre.

ABSTRACTS BELOW ⤵️

On the evening of Tuesday November 14th we welcomed Red Hat developer Kevin Dubois to join the Dublin Java User Group at TechMeetup.space in the city centre.

ABSTRACTS BELOW ⤵️

Java Champion and Azul developer, Gerrit Grunwald (aka Hansolo) joined us on the evening of Tuesday October 31st at TechMeetup.space in Dublin city centre.

On a rare appearance in Ireland Java Champion extraordinaire Venkat Subramanian treated us to a 90 minute deep-dive on Refactoring from Imperative to Functional Style.

ABSTRACT BELOW ⤵️

We hope you joined us the evening of Thursday September 21st, as the Dublin Java User Group welcomed Kris Foster LIVE in-person at TechMeetup.space to give you solid advice on how to get the most out of your Java applications.

ABSTRACTS BELOW ⤵️

We hope you joined us July 17th, as the Dublin Java User Group welcomed Java Champion Bruno Souza LIVE in-person at TechMeetup.space to share secrets of life beyond a senior Java developer.

ABSTRACTS BELOW ⤵️

This month the Dublin Java User Group welcomed two local Dublin speakers, Shritesh Jamulkar (Blockchain Corda) and Ahmad Albarqawi (Intelligent Java AI) LIVE in-person at TechMeetup.space.

We hope you joined us February 28th, as the Dublin Java User Group welcomed Java Champion Maarten Mulders LIVE in-person at TechMeetup.space to present two talks, 'What's Cooking in Maven', and 'React in 50 minutes'.

On February 1st, the Dublin Java User Group welcomed Red Hat Developer Eric Deandrea LIVE in-person at TechMeetup.space to present 'Quarkus for Spring Developers', his 90 minute deep-dive session.

We hope you joined us at TechMeetup.space on January 24th as Java Champion Mary Grygleski flew in from Chicago to show you how to build an efficient streaming data pipeline with Apache Pulsar and Apache Cassandra.

We hope you joined us on January 19th as the Dublin Java User Group hosted the jChampions Conference Watch Party, finishing with two live talks with Norwegian Java Champion Rustam Mehmandarov LIVE and IN-PERSON.

We hope you joined us in-person on the evening of Wednesday 23rd November at TechMeetup.Space, Dublin city centre, was multi-award winning Java Rockstar and Java Champion, Maurice Naftalin. The event was in-person and livestream.

During the day Maurice was running a heavily subsidised Lambda training session - every software developer should be proficient in this area - spaces limited - [details](https://ti.to/dublin-java-user-group/nov-2022-lambdas-streams-collectors-course)

Interested in learning about lambdas streams and collectors in depth?

These powerful Java features allow you to implement complex operations clearly and concisely. This one-day course introduces the ideas of lambdas and streams, and then takes you from the basics to advanced use cases.

Java Champion Holly Cummins was joining us in-person on the evening of Wednesday 2nd November at TechMeetup.Space. She presented 'Cloud Chaos and Microservices Mayhem,' and her brand new, never presented before talk, 'Writing Greener Java Applications.'

Matt Raible, Java Champion, and Okta Developer advocate was back at the Dublin Java User Group on Wednesday 28th September - we had one almighty in-person deep dive - Micro Frontends for Java Developers. Livestream recorded

In September 2022 Java Champion Ixchel Ruiz joined us from Switzerland to present two outstanding talks, 'DevOps for Java Developers', and 'Framework Agnostic REST API Testing', both choices of our platinum members.

Read below for full details...

# **REGISTRATION NOTES**

The Dublin Java User Group events are designed to enrich the knowledge and careers of developers and technology professionals. By booking your seat, you agree to the [booking conditions](http://dubjug.org/booking.php)

**PUBLIC HEALTH:** We aim to provide a safe space to meet in-person - please do not attend this event if you are currently or in the last ten days prior to the event, experienced symptoms of cold, flu, Covid-19, winter vomiting. Thank you.

**MORE DUBLIN JAVA USER GROUP EVENTS**
**Meet JavaOne Rockstars and Java Champions! Check out our other Dublin Java User Group events** - [**DubJUG.org**](https://dubjug.org)

IBM's Developer Advocate and Java Champion, Grace Jansen visited the Dublin Java User Group to give 'hands-on' help with open-source technologies and tools (including MicroProfile, Jakarta EE, Open Liberty, OpenJ9, and more!) for the 15 factors needed to build cloud native applications.

The midsummer of June 2022 saw Java Champion Simon Ritter join us in Dublin, presenting two fabulous sessions; The Art of Java Language Pattern Matching, and Java on CRaC: Superfast JVM Application Start-up.

On Thursday 28th April 2022, the Dublin Java User Group hosted Security Champion and JavaOne Rockstar Steve Poole at TechMeetup.Space in tcube, No.1 O'Connell Street, Dublin.

It was an insightful night dedicated to Cybercrime and its bigger more dangerous cousin: Cyber-warfare. We explored the drivers behind the radical shift, the software arsenal available and how and why you, the software developers, are both target and unwitting helpers.

##SESSION ABSTRACTS BELOW....

The Dublin Java User Group hosted Java Champion and Jakarta EE Developer Advocate at Eclipse Foundation, Ivar Grimstad, on Thursday 31st March at TechMeetup.Space in tcube, No.1 O'Connell Street, Dublin.

**REGISTRATION NOTES**

The Dublin Java User Group events are designed to enrich the knowledge and careers of developers and technology professionals. By booking your seat, you agree to the [booking conditions](http://dubjug.org/booking.php)

**PUBLIC HEALTH:** We aim to provide a safe space to meet - please do not attend this event if you are currently or in the last ten days prior to the event, experienced symptoms of cold, flu, Covid-19, winter vomiting. Thank you.

##**MORE DUBLIN JAVA USER GROUP EVENTS**
**Interested in meeting Java Rockstars? Check out our other Dublin Java User Group events** - [**DubJUG.org**](https://dubjug.org)

The Dublin Java User Group hosted a WATCH PARTY of the jChampions Conference 2022 on the afternoons and evenings of Thursday 20th, Friday 21st, Monday 24th, and Tuesday 25th January at TechMeetup.Space in tcube, No.1 O'Connell Street..

**Monday's session will also see local Java Champion Rafael del Nero present his session live from DubJUG.**

**REGISTRATION NOTES**

The Dublin Java User Group events are designed to enrich the knowledge and careers of developers and technology professionals. By booking your seat, you agree to the [booking conditions](http://dubjug.org/booking.php)

**COVID-19:** Attendees must be "fully vaccinated", bringing your cert and ID with you. People will be seated 2m apart which means spaces are limited. Pre-booking, therefore, is essential. No booking or Covid cert - no entry!

##**MORE DUBLIN JAVA USER GROUP EVENTS**
**Interested in meeting Java Rockstars? Check out our other Dublin Java User Group events** - [**DubJUG.org**](https://dubjug.org)

Local Java developer and DubJUG Co-Lead, Barry Evans, presented DubJUG’s first in-person event (since March 2020) on the evening of December 21st.

**REGISTRATION NOTES**

The Dublin Java User Group events are designed to enrich the knowledge and careers of developers and technology professionals. By booking your seat, you agree to the [booking conditions](http://dubjug.org/booking.php)

You must be fully vaccinated, bringing your cert and ID with you. Spaces are limited.

**PLATINUM MEMBERSHIP**

Due to the overwhelming demand to attend, our events are always full. Priority booking is offered to our Platinum Members. Email [email protected] if you'd like to know more about becoming a coveted Platinum Member of the Ireland's longest running, most respected and most active Java User Group.

##**MORE DUBLIN JAVA USER GROUP EVENTS**
**Interested in meeting Java Rockstars? Check out our other Dublin Java User Group events** - [**DubJUG.org**](https://dubjug.org)

Java Champion Bruno Borges visited the Oracle Dublin Java User Group in September. Bruno explained why Microsoft acknowledges and supports the adoption of custom Java runtimes crafted for specific application needs rather than the use of general-purpose Java runtimes.

**REGISTRATION NOTES**

The Dublin Java User Group events are designed to enrich the knowledge and careers of developers and technology professionals. By booking your seat, you agree to the [booking conditions](http://dubjug.org/booking.php)

**PLATINUM MEMBERSHIP**

Due to the overwhelming demand to attend, our events are always full. Priority booking is offered to our Platinum Members. Email [email protected] if you'd like to know more about becoming a coveted Platinum Member of the Ireland's longest running, most respected and most active Java User Group.

##**MORE DUBLIN JAVA USER GROUP EVENTS**
**Interested in meeting Java Rockstars? Check out our other Dublin Java User Group events** - [**DubJUG.org**](https://dubjug.org)

Java celebrated its 25th anniversary that year, and the Dublin Java User Group marked the occasion with a day-long mini-conf, #Java25, on Thursday 27th August in Dublin city centre for 100 developers.

**REGISTRATION NOTES**

The Dublin Java User Group events are designed to enrich the knowledge and careers of developers and technology professionals. By booking your seat, you agree to the [booking conditions](http://dubjug.org/booking.php)

Test expert John Ferguson Smart visited DubJUG in April — details were shared ahead of the event.

**REGISTRATION NOTES**

The Dublin Java User Group events are designed to enrich the knowledge and careers of developers and technology professionals. By booking your seat, you agree to the [booking conditions](http://dubjug.org/booking.php)

**PLATINUM MEMBERSHIP**

Due to the overwhelming demand to attend, our events are always full. Priority booking is offered to our Platinum Members. Email [email protected] if you'd like to know more about becoming a coveted Platinum Member of the Ireland's longest running, most respected and most active Java User Group.

##**MORE DUBLIN JAVA USER GROUP EVENTS**
**Interested in meeting Java Rockstars? Check out our other Dublin Java User Group events** - [**DubJUG.org**](http://dubjug.org)

Frank Fischer, head of Developer Relations at DeepCode, the Zurich-based company that uses AI to identify bugs before they happen, came to present at the Dublin Java User Group in the city centre on the evening of Tuesday, March 10th.

**REGISTRATION NOTES**

The Dublin Java User Group events are designed to enrich the knowledge and careers of developers and technology professionals. By booking your seat, you agree to the [booking conditions](http://dubjug.org/booking.php)

**PLATINUM MEMBERSHIP**

Due to the overwhelming demand to attend, our events are always full. Priority booking is offered to our Platinum Members. Email [email protected] if you'd like to know more about becoming a coveted Platinum Member of the Ireland's longest running, most respected and most active Java User Group.

##**MORE DUBLIN JAVA USER GROUP EVENTS**
**Interested in meeting Java Rockstars? Check out our other Dublin Java User Group events** - [**DubJUG.org**](http://dubjug.org)

Brazilian Java Champion and Duke Award Winner, Otavio Santana visited the Oracle Dublin Java User Group in December. Subscribers were notified when the talks were announced.

**REGISTRATION NOTES**

The Dublin Java User Group events are designed to enrich the knowledge and careers of developers and technology professionals. By booking your seat, you agree to the [booking conditions](http://dubjug.org/booking.php)

**PLATINUM MEMBERSHIP**

Due to the overwhelming demand to attend, our events are always full. Priority booking is offered to our Platinum Members. Email [email protected] if you'd like to know more about becoming a coveted Platinum Member of the Ireland's longest running, most respected and most active Java User Group.

##**MORE DUBLIN JAVA USER GROUP EVENTS**
**Interested in meeting Java Rockstars? Check out our other Dublin Java User Group events** - [**DubJUG.org**](http://dubjug.org)

Co-author of the highly acclaimed *Testing Java Microservices*, Andy Gumbrecht visited the Oracle Dublin Java User Group in November. Focusing on testing, attendees learned some neat embedded Kafka and Mongo, Arquillian, and GitLab pipeline tests.

**REGISTRATION NOTES**

The Dublin Java User Group events are designed to enrich the knowledge and careers of developers and technology professionals. By booking your seat, you agree to the [booking conditions](http://dubjug.org/booking.php)

**PLATINUM MEMBERSHIP**

Due to the overwhelming demand to attend, our events are always full. Priority booking is offered to our Platinum Members. Email [email protected] if you'd like to know more about becoming a coveted Platinum Member of the Ireland's longest running, most respected and most active Java User Group.

##**MORE DUBLIN JAVA USER GROUP EVENTS**
**Interested in meeting Java Rockstars? Check out our other Dublin Java User Group events** - [**DubJUG.org**](http://dubjug.org)

We have another Java Champion visiting us in October. Edson Yanaga is Director of Developer Experience for Red Hat. In this double bill, Yanaga, as he is affectionately known the world over, will embark upon a live coding session before your very eyes with the supersonic subatomic Java, Quarkus, a Kubernetes Native Java stack tailored for GraalVM & OpenJDK HotSpot, crafted from the best of breed Java libraries and standards. Right!


**REGISTRATION NOTES**

The Dublin Java User Group events are designed to enrich the knowledge and careers of developers and technology professionals. By booking your seat, you agree to the [booking conditions](http://dubjug.org/booking.php)


**PLATINUM MEMBERSHIP**

Due to the overwhelming demand to attend, our events are always full. Priority booking is offered to our Platinum Members. Email [email protected] if you'd like to know more about becoming a coveted Platinum Member of the Ireland's longest running, most respected and most active Java User Group.


##**MORE DUBLIN JAVA USER GROUP EVENTS**
**Interested in meeting Java Rockstars? Check out our other Dublin Java User Group events** - [**DubJUG.org**](http://dubjug.org)

“For our first event of October, Polish Java developer Ryszard Perkowski, aka Rick, visited the Oracle Dublin Java User Group for the first time. He presented new kid on the block, Micronaut — a competitor to Spring.

**REGISTRATION NOTES**

The Dublin Java User Group events are designed to enrich the knowledge and careers of developers and technology professionals. By booking your seat, you agree to the [booking conditions](http://dubjug.org/booking.php)

**PLATINUM MEMBERSHIP**

Due to the overwhelming demand to attend, our events are always full. Priority booking is offered to our Platinum Members. Email [email protected] if you'd like to know more about becoming a coveted Platinum Member of the Ireland's longest running, most respected and most active Java User Group.

##**MORE DUBLIN JAVA USER GROUP EVENTS**
**Interested in meeting Java Rockstars? Check out our other Dublin Java User Group events** - [**DubJUG.org**](http://dubjug.org)

\*\*“Hazelcast’s Riaz Mohammed made his return to the Oracle Dublin Java User Group to walk attendees through how to set up an end-to-end enterprise-grade platform to operationalize Artificial Intelligence using the open-source Hazelcast technology.

The Oracle DubJUG event took place at 19:00 on Wednesday 18th September.

# **Whoaaaa! STOP THE PRESS....**

At this event, we will be giving away a free [**Voxxed Days Microservices**](https://voxxeddays.com/microservices/) conference and workshop taking place in Paris October 21-23. The ticket is worth 840 euro!

You need to be at the Oracle DubJUG event to be in with a chance to get your hands on this fabulous prize - our developer-only event takes place at 19:00 on Wednesday 18th September in Dublin city centre.

**REGISTRATION NOTES**

The Dublin Java User Group events are designed to enrich the knowledge and careers of developers and technology professionals. By booking your seat, you agree to the [booking conditions](http://dubjug.org/booking.php)

**PLATINUM MEMBERSHIP**

Due to the overwhelming demand to attend, our events are always full. Priority booking is offered to our Platinum Members. Email [email protected] if you'd like to know more about becoming a coveted Platinum Member of the Ireland's longest running, most respected and most active Java User Group.

##**MORE DUBLIN JAVA USER GROUP EVENTS**
**Interested in meeting Java Rockstars? Check out our other Dublin Java User Group events** - [**DubJUG.org**](http://dubjug.org)

Java Champion and author of *The JHipster Mini-Book* and *Spring Live*, Matt Raible, returned to share his expert knowledge — delivering an amazing array of information that enabled new beginnings in many Java careers.

The Oracle DubJUG event took place at 19:00 on Tuesday 10th September.

**REGISTRATION NOTES**

The Dublin Java User Group events are designed to enrich the knowledge and careers of developers and technology professionals. By booking your seat, you agree to the [booking conditions](http://dubjug.org/booking.php)

**PLATINUM MEMBERSHIP**

Due to the overwhelming demand to attend, our events are always full. Priority booking is offered to our Platinum Members. Email [email protected] if you'd like to know more about becoming a coveted Platinum Member of the Ireland's longest running, most respected and most active Java User Group.

##**MORE DUBLIN JAVA USER GROUP EVENTS**
**Interested in meeting Java Rockstars? Check out our other Dublin Java User Group events** - [**DubJUG.org**](http://dubjug.org)

We warmly welcomed Java Champion Emily Jiang to the Oracle Dublin Java User Group on Wednesday 31st July. Emily, who works in IBM’s Hursley Lab, is a regular speaker at global events such as Code One, DevNexus, JAX London, Voxxed, Devoxx US, Devoxx Belgium, Devoxx UK, Devoxx France, and EclipseCon.

**REGISTRATION NOTES**

The Dublin Java User Group events are designed to enrich the knowledge and careers of developers and technology professionals. By booking your seat, you agree to the [booking conditions](http://dubjug.org/booking.php)

**PLATINUM MEMBERSHIP**

Due to the overwhelming demand to attend, our events are always full. Priority booking is offered to our Platinum Members. Email [email protected] if you'd like to know more about becoming a coveted Platinum Member of the Ireland's longest running, most respected and most active Java User Group.

##**MORE DUBLIN JAVA USER GROUP EVENTS**
**Interested in meeting Java Rockstars? Check out our other Dublin Java User Group events** - [**DubJUG.org**](http://dubjug.org)

Lead developer advocate at Oracle Labs and Java Champion, Oleg Selajev, took a hop from his native Estonia for a tour of Ireland in July. Oleg explained GraalVM.

This Oracle DubJUG event took place at 19:00 on Tuesday 16th July in Dublin city centre.

**REGISTRATION NOTES**

The Dublin Java User Group events are designed to enrich the knowledge and careers of developers and technology professionals. By booking your seat, you agree to the [booking conditions](http://dubjug.org/booking.php)

**PLATINUM MEMBERSHIP**

Due to the overwhelming demand to attend, our events are always full. Priority booking is offered to our Platinum Members. Email [email protected] if you'd like to know more about becoming a coveted Platinum Member of the Ireland's longest running, most respected and most active Java User Group.

##**MORE DUBLIN JAVA USER GROUP EVENTS**
**Interested in meeting Java Rockstars? Check out our other Dublin Java User Group events** - [**DubJUG.org**](http://dubjug.org)

Our June event saw Tomitribe’s Director of Engineering, Jean-Louis Monteiro, join us at the Oracle Dublin Java User Group to share his knowledge of Eclipse MicroProfile. Members left 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 to IntelliJ.


##**MORE DUBLIN JAVA USER GROUP EVENTS**
**Interested in meeting Java Rockstars? Check out our other Dublin Java User Group events** - [**DubJUG.org**](http://dubjug.org)

The second May event of the Oracle Dublin Java User Group saw Thomas Darimont, fellow at one of Europe’s best-known software companies, Codecentric AG, come to talk about open-source identity and access management with Keycloak.

Brian Matthews of Búraló Technologies returned to the Oracle Dublin Java User Group on Thursday 2nd May. At the time, he was consulting at Synchronoss Technologies, working remotely from the comfort of his home in Rostov-on-Don, Russia.

**REGISTRATION NOTES**

The Dublin Java User Group events are designed to enrich the knowledge and careers of developers and technology professionals. By booking your seat, you agree to the [booking conditions](http://dubjug.org/booking.php)

**PLATINUM MEMBERSHIP**

Due to the overwhelming demand to attend, our events are always full. Priority booking is offered to our Platinum Members. Email [email protected] if you'd like to know more about becoming a coveted Platinum Member of the Ireland's longest running, most respected and most active Java User Group.

##**MORE DUBLIN JAVA USER GROUP EVENTS**
**Interested in meeting Java Rockstars? Check out our other Dublin Java User Group events** - [**DubJUG.org**](http://dubjug.org)

A man known the world over for live-coding lambdas in venues to make breakbeat music, PraxisLive’s Neil C Smith, came to the Oracle Dublin Java User Group on Wednesday 10th April. Joining him at our sixth event of 2019 was John Ferguson Smart, O’Reilly and Manning author of *BDD in Action*, *Java Power Tools*, and *Jenkins: The Definitive Guide*.

**REGISTRATION NOTES**

The Dublin Java User Group events are designed to enrich the knowledge and careers of developers and technology professionals. By booking your seat, you agree to the [booking conditions](http://dubjug.org/booking.php)

**PLATINUM MEMBERSHIP**

Due to the overwhelming demand to attend, our events are always full. Priority booking is offered to our Platinum Members. Email [email protected] if you'd like to know more about becoming a coveted Platinum Member of the Ireland's longest running, most respected and most active Java User Group.

##**MORE DUBLIN JAVA USER GROUP EVENTS**
**Interested in meeting Java Rockstars? Check out our other Dublin Java User Group events** - [**DubJUG.org**](http://dubjug.org)

Our fifth event of 2019 saw Director of the Oracle Groundbreakers Team, global keynote speaker, and Java Rockstar Stephen Chin come to the Oracle Dublin Java User Group on Thursday 21st March. Known the world over for his stage antics and hair-raising motorcycle expeditions, it was a once-in-a-lifetime opportunity (well, ‘once’ unless you could afford to go to the global conferences outside of Ireland!) to meet Stephen on our turf.

##**SCROLL DOWN FOR DETAILED TALK ABSTRACTS**

**REGISTRATION NOTES**

The Dublin Java User Group events are designed to enrich the knowledge and careers of developers and technology professionals. By booking your seat, you agree to the [booking conditions](http://dubjug.org/booking.php)

**PLATINUM MEMBERSHIP**

Due to the overwhelming demand to attend, our events are always full. Priority booking is offered to our Platinum Members. Email [email protected] if you'd like to know more about becoming a coveted Platinum Member of the Ireland's longest running, most respected and most active Java User Group.

##**MORE DUBLIN JAVA USER GROUP EVENTS**
\*\*Interested in meeting Java Rockstars? Check out our other Dublin Java User Group events - \*\* [**DubJUG.org**](http://dubjug.org)

Our fourth event of 2019 saw Oracle’s keynote speakers Mark Reinhold and Brian Goetz make a journey to the Oracle Dublin Java User Group on Wednesday 6th March. The full talk abstracts were shared below...

**REGISTRATION NOTES**

The Dublin Java User Group meetups are designed to enhance the knowledge of developers and technology professionals\*. Due to the overwhelming demand to attend our events they are always full.

We reserve the right to cancel bookings if you are not aligned to our intended audience. No refunds are given for ticket cancellations or no-shows. Check your diary carefully before booking!

Email [email protected] if you're interested in becoming a coveted Platinum Member of the Ireland's longest running, most respected and most active Java User Group.

##**MORE DUBLIN JAVA USER GROUP EVENTS**
**Are you interested in enriching your career and business with knowledge given by the world's most recognised Java Rockstars and Java Champions? If so, check out our Oracle Dublin Java User Group events here - [DubJUG.org](http://dubjug.org)**

Our third event of 2019 saw Oracle’s Serverless Developer Relations teamster David Delabassee return to the Dublin Java User Group on Wednesday 6th February. The full talk abstracts were shared below...

**REGISTRATION NOTES**

The Dublin Java User Group meetups are designed to enhance the knowledge of developers and technology professionals\*. Due to the overwhelming demand to attend our events they are always full.

We reserve the right to cancel bookings if you are not aligned to our intended audience. No refunds are given for ticket cancellations or no-shows. Check your diary carefully before booking!

Email [email protected] if you're interested in becoming a coveted Platinum Member of the Ireland's longest running, most respected and most active Java User Group.

##**MORE DUBLIN JAVA USER GROUP EVENTS**
\*\*Interested in meeting Java Rockstars? Check out our other Dublin Java User Group events - \*\* [**DubJUG.org**](http://dubjug.org)

Our second event of 2019 saw consultant Sander Mak visit us from Holland to talk to us about Java on 24th January. The full talk abstracts were shared below. The Dublin 2 venue was revealed on booking.
.

**REGISTRATION NOTES**

The Dublin Java User Group meetups are designed to enhance the knowledge of developers and technology professionals\*. Due to the overwhelming demand to attend our events they are always full.

We reserve the right to cancel bookings if you are not aligned to our intended audience. No refunds are given for ticket cancellations or no-shows. Check your diary carefully before booking!

Email [email protected] if you're interested in becoming a coveted Platinum Member of the Ireland's longest running, most respected and most active Java User Group.

##**MORE DUBLIN JAVA USER GROUP EVENTS**
\*\*Interested in meeting Java Rockstars? Check out our other Dublin Java User Group events - \*\* [**DubJUG.org**](http://dubjug.org)

Our first evening event of 2019 sees Oracle Developer Advocate Juarez Barbosa Junior talk to us on the Oracle Blockchain, 22nd January.
Check out the full talk abstracts below. The Dublin 2 venue is revealed on booking.
.

**REGISTRATION NOTES**

The Dublin Java User Group meetups are designed to enhance the knowledge of developers and technology professionals*. Due to the overwhelming demand to attend our events they are always full.

We reserve the right to cancel bookings if you are not aligned to our intended audience. No refunds are given for ticket cancellations or no-shows. Check your diary carefully before booking!

Email [email protected] if you're interested in becoming a coveted Platinum Member of the Ireland's longest running, most respected and most active Java User Group.


##**MORE DUBLIN JAVA USER GROUP EVENTS**
**Interested in meeting Java Rockstars? Check out our other Dublin Java User Group events - ** [**DubJUG.org**](http://dubjug.org)

\*\*“On 20th December 2018, we went totally Java. The talks were presented by Oracle’s Chris Hegarty and Workday engineer and DubJUG member Anton Balaniuc.

The full talk abstracts were shared below. The Dublin 2 venue was revealed on booking.

.

**REGISTRATION NOTES**

The Dublin Java User Group meetups are designed to enhance the knowledge of developers and technology professionals\*. Due to the overwhelming demand to attend our events they are always full.

We reserve the right to cancel bookings if you are not aligned to our intended audience. No refunds are given for ticket cancellations or no-shows. Check your diary carefully before booking!

Email [email protected] if you're interested in becoming a coveted Platinum Member of the Ireland's longest running, most respected and most active Java User Group.

##**MORE DUBLIN JAVA USER GROUP EVENTS**
\*\*Interested in meeting Java Rockstars? Check out our other Dublin Java User Group events - \*\* [**DubJUG.org**](http://dubjug.org)

On 13th December 2018, DubJUG co-lead Barry Evans presented the Eclipse Collections Kata workshop for members of the Oracle Dublin Java User Group.

The full talk abstracts were shared below. The Dublin 2 venue was revealed on booking.

.

**REGISTRATION NOTES**

The Dublin Java User Group meetups are designed to enhance the knowledge of developers and technology professionals\*. Due to the overwhelming demand to attend our events they are always full.

We reserve the right to cancel bookings if you are not aligned to our intended audience. No refunds are given for ticket cancellations or no-shows. Check your diary carefully before booking!

Email [email protected] if you're interested in becoming a coveted Platinum Member of the Ireland's longest running, most respected and most active Java User Group.

##**MORE DUBLIN JAVA USER GROUP EVENTS**
\*\*Interested in meeting Java Rockstars? Check out our other Dublin Java User Group events - \*\* [**DubJUG.org**](http://dubjug.org)

On 15th November 2018, we welcomed Benjamin Nothdurft to the Oracle Dublin Java User Group.

Benjamin was working for Codecentric at the time, and had formerly been with ePages, the German eCommerce provider that helped over 140,000 businesses get their online shops open.

The full talk abstracts were shared below. The Dublin 2 venue was revealed on booking.
.

**REGISTRATION NOTES**

The Dublin Java User Group meetups are designed to enhance the knowledge of developers and technology professionals\*. Due to the overwhelming demand to attend our events they are always full.

We reserve the right to cancel bookings if you are not aligned to our intended audience. No refunds are given for ticket cancellations or no-shows. Check your diary carefully before booking!

Email [email protected] if you're interested in becoming a coveted Platinum Member of the Ireland's longest running, most respected and most active Java User Group.

##**MORE DUBLIN JAVA USER GROUP EVENTS**
\*\*Interested in meeting Java Rockstars? Check out our other Dublin Java User Group events - \*\* [**DubJUG.org**](http://dubjug.org)

On 30th October 2018, we welcomed Tim Graves to the Oracle Dublin Java User Group. Tim worked on architecting cloud-native solutions, including the use of the Oracle IoT Cloud Service to bring data into the environment and enable the creation of digital replicas of physical devices.

The full talk abstracts were shared below. The Dublin 2 venue was revealed on booking.
.

**REGISTRATION NOTES**

The Dublin Java User Group meetups are designed to enhance the knowledge of developers and technology professionals\*. Due to the overwhelming demand to attend our events they are always full.

We reserve the right to cancel bookings if you are not aligned to our intended audience. No refunds are given for ticket cancellations or no-shows. Check your diary carefully before booking!

Email [email protected] if you're interested in becoming a coveted Platinum Member of the Ireland's longest running, most respected and most active Java User Group.

##**MORE DUBLIN JAVA USER GROUP EVENTS**
\*\*Interested in meeting Java Rockstars? Check out our other Dublin Java User Group events - \*\* [**DubJUG.org**](http://dubjug.org)

For October’s Oracle Dublin Java User Group event, we were privileged to welcome Elastic guys Philipp Krenn and David Pilato, who showed how Elastic can enhance legacy apps and how to monitor Spring Boot applications.

This event took place at 19:00 on Thursday 11th October.

The full talk abstracts were shared below.

.

**REGISTRATION NOTES**

The Oracle Dublin Java User Group meetups are designed to enhance the knowledge of developers and technology professionals\*. Due to the overwhelming demand to attend our events they are always full.

We reserve the right to cancel bookings if you are not aligned to our intended audience. No refunds are given for ticket cancellations or no-shows. Check your diary carefully before booking!

Email [email protected] if you're interested in becoming a coveted Platinum Member of the Ireland's longest running, most respected and most active Java User Group.

##**MORE ORACLE DUBLIN JAVA USER GROUP EVENTS**
**Java developers who are interested in this meetup are also attending other Oracle Dublin Java User Group meetups - check them at** [**DubJUG.org**](http://dubjug.org)

We were privileged to host the Irish leg of the Pivotal+Microsoft JUG Tour Europe 2018.

This event took place on 8th October 2018 at Dogpatch Labs — doors opened at 18:15, with presentations starting at 19:00 sharp.

The full talk abstracts were shared below.

.

**REGISTRATION NOTES**

The Dublin Java User Group meetups are designed to enhance the knowledge of developers and technology professionals\*. Due to the overwhelming demand to attend our events they are always full.

We reserve the right to cancel bookings if you are not aligned to our intended audience. No refunds are given for ticket cancellations or no-shows. Check your diary carefully before booking!

Email [email protected] if you're interested in becoming a coveted Platinum Member of the Ireland's longest running, most respected and most active Java User Group.

##**MORE DUBLIN JAVA USER GROUP EVENTS**
**Interested in meeting Java Rockstars? Check out our other Dublin Java User Group events** - [**DubJUG.org**](http://dubjug.org)

On 22nd September 2018, we were incredibly privileged to welcome Dr. Venkat Subramaniam to Dublin and to the Dublin Java User Group again.

The full talk abstracts were shared below. The Dublin 2 venue was revealed on booking.
.

**REGISTRATION NOTES**

BOOKING FOR THIS EVENT CLOSES AT 10:00am SATURDAY.

The Dublin Java User Group meetups are designed to enhance the knowledge of developers and technology professionals\*. Due to the overwhelming demand to attend our events they are always full.

We reserve the right to cancel bookings if you are not aligned to our intended audience. No refunds are given for ticket cancellations or no-shows. Check your diary carefully before booking!

Email [email protected] if you're interested in becoming a coveted Platinum Member of the Ireland's longest running, most respected and most active Java User Group.

##**MORE DUBLIN JAVA USER GROUP EVENTS**
\*\*Interested in meeting Java Rockstars? Check out our other Dublin Java User Group events - \*\* [**DubJUG.org**](http://dubjug.org)

For September’s DubJUG event, we were privileged to welcome Scott Sosna, who works at Dell EMS Greater Minneapolis and also served on the Content Review Committee for JavaOne.

This event took place at 19:00 on Thursday 13th September.

The full talk abstracts were shared below..

.

**REGISTRATION NOTES**

The Dublin Java User Group meetups are designed to enhance the knowledge of developers and technology professionals\*. Due to the overwhelming demand to attend our events they are always full.

We reserve the right to cancel bookings if you are not aligned to our intended audience. No refunds are given for ticket cancellations or no-shows. Check your diary carefully before booking!

Email [email protected] if you're interested in becoming a coveted Platinum Member of the Ireland's longest running, most respected and most active Java User Group.

##**MORE DUBLIN JAVA USER GROUP EVENTS**
**Java developers who are interested in this meetup are also attending other Dublin Java User Group meetups - check them at** [**DubJUG.org**](http://dubjug.org)

It had been over ten years since we first met Java Champion and author of *The JHipster Mini-Book* and *Spring Live*, Matt Raible, and we were delighted and privileged to welcome him again to share his expert knowledge in his session ‘Bootiful Development with Spring Boot and React’.

This event took place at 19:00 on Thursday 12th September.

The full talk abstracts were shared below.

.

**REGISTRATION NOTES**

The Dublin Java User Group meetups are designed to enhance the knowledge of developers and technology professionals\*. Due to the overwhelming demand to attend our events they are always full.

We reserve the right to cancel bookings if you are not aligned to our intended audience. No refunds are given for ticket cancellations or no-shows. Check your diary carefully before booking!

Email [email protected] if you're interested in becoming a coveted Platinum Member of the Ireland's longest running, most respected and most active Java User Group.

##**MORE DUBLIN JAVA USER GROUP EVENTS**
\*\*Interested in meeting Java Rockstars? Check out our other Dublin Java User Group events - \*\* [**DubJUG.org**](http://dubjug.org)

For our first DubJUG August event, we were privileged to welcome from Germany Java Champion, Java Rockstar, and Oracle Developer Champion Sebastian Daschner, who shared his expert knowledge in two talks: ‘Cloud Native, Service-Meshed Java Enterprise With Istio’ and ‘7 Principles of Productive Software Developers’.

This event took place at 19:00 on Thursday 9th August.

The full talk abstracts were shared below.

.

**REGISTRATION NOTES**

The Dublin Java User Group meetups are designed to enhance the knowledge of developers and technology professionals\*. Due to the overwhelming demand to attend our events they are always full.

We reserve the right to cancel bookings if you are not aligned to our intended audience. No refunds are given for ticket cancellations or no-shows. Check your diary carefully before booking!

Email [email protected] if you're interested in becoming a coveted Platinum Member of the Ireland's longest running, most respected and most active Java User Group.

##**MORE DUBLIN JAVA USER GROUP EVENTS**
\*\*Interested in meeting Java Rockstars? Check out our other Dublin Java User Group events - \*\* [**DubJUG.org**](http://dubjug.org)

For the last DubJUG event in July, we welcomed Matthew Gilliard, who works at Oracle UK. Matthew shared his expert knowledge around containers and serverless.

This event took place at 19:00 on Thursday 26th July.

The full talk abstracts were shared below.

.

**REGISTRATION NOTES**

The Dublin Java User Group meetups are designed to enhance the knowledge of developers and technology professionals\*. Due to the overwhelming demand to attend our events they are always full.

We reserve the right to cancel bookings if you are not aligned to our intended audience. No refunds are given for ticket cancellations or no-shows. Check your diary carefully before booking!

Email [email protected] if you're interested in becoming a coveted Platinum Member of the Ireland's longest running, most respected and most active Java User Group.

##**MORE DUBLIN JAVA USER GROUP EVENTS**
**Java developers who are interested in this meetup are also attending other Dublin Java User Group meetups - check them at** [**DubJUG.org**](http://dubjug.org)

Due to demand and a 'sold-out' workshop in June, DubJUG co-lead Barry Evans is giving you the chance to attend his highly interactive hands-on workshop Docker for Java Developers on the evening of July 19th.

.

Check out the full workshop abstract below. Doors 18:15 / Prompt Start 19:00.

.

**REGISTRATION NOTES**

The Dublin Java User Group meetups are designed to enhance the knowledge of developers and technology professionals.

Due to the overwhelming demand to attend our events they are always full so make sure you're subscribed to the wait-list to get the release notification of this and future Dublin Java User Group events.

Better still, email [email protected] and we'll tell you how to become a coveted Platinum Member of the Ireland's longest running, most respected and most active Java User Group.

##**MORE DUBLIN JAVA USER GROUP EVENTS**
**Java developers who are interested in this meetup are also attending other Dublin Java User Group meetups - check them at** [**DubJUG.org**](http://dubjug.org)

For the DubJUG May event, we welcomed back Brian Matthews, long-term DubJUG member and now JUG leader in Rostov-on-Don, Russia, who presented on building reactive microservices using the soon-to-be-released 2.0 version of Spring Boot, along with cloud-native applications.

Doors opened at 18:15, and talks started at 19:00.

The full talk abstracts were shared below.

.

**REGISTRATION NOTES**

The Dublin Java User Group meetups are designed to enhance the knowledge of developers and technology professionals.

Due to the overwhelming demand to attend our events they are always full so make sure you're subscribed to the wait-list to get the release notification of this and future Dublin Java User Group events.

Better still, email [email protected] and we'll tell you how to become a coveted Platinum Member of the Ireland's longest running, most respected and most active Java User Group.

##**MORE DUBLIN JAVA USER GROUP EVENTS**
**Java developers who are interested in this meetup are also attending other Dublin Java User Group meetups - check them at** [**DubJUG.org**](http://dubjug.org)

For the DubJUG June event, we welcomed back Brian Benz, a Microsoft Advocate on Java technologies. This presentation built upon his highly acclaimed talk at DubJUG in November 2017, followed by a session on serverless.

The full talk abstracts were shared below.

.

**REGISTRATION NOTES**

The Dublin Java User Group meetups are designed to enhance the knowledge of developers and technology professionals.

Due to the overwhelming demand to attend our events they are always full so make sure you're subscribed to the wait-list to get the release notification of this and future Dublin Java User Group events.

Better still, email [email protected] and we'll tell you how to become a coveted Platinum Member of the Ireland's longest running, most respected and most active Java User Group.

##**MORE DUBLIN JAVA USER GROUP EVENTS**
**Java developers who are interested in this meetup are also attending other Dublin Java User Group meetups - check them at** [**DubJUG.org**](http://dubjug.org)

For our second DubJUG event in June, we welcomed Riaz Mohammed from Hazelcast, the leading in-memory data management company, who discussed Hazelcast’s integration with Spring. Alongside Riaz, DubJUG member Anton Balaniuc from Workday provided insight into Java 8 Streams.

This event was sponsored by Hazelcast. Attendees had a chance to win an Amazon Echo.

The full talk abstracts were shared below.


.

**REGISTRATION NOTES**

The Dublin Java User Group meetups are designed to enhance the knowledge of developers and technology professionals.

Due to the overwhelming demand to attend our events they are always full so make sure you're subscribed to the wait-list to get the release notification of this and future Dublin Java User Group events.

Better still, email [email protected] and we'll tell you how to become a coveted Platinum Member of the Ireland's longest running, most respected and most active Java User Group.

##**MORE DUBLIN JAVA USER GROUP EVENTS**
**Java developers who are interested in this meetup are also attending other Dublin Java User Group meetups - check them at** [**DubJUG.org**](http://dubjug.org)

On the evening of 7th June, DubJUG co-lead Barry Evans ran a highly interactive hands-on workshop giving a brief introduction to using Docker for Java Developers.

The full workshop abstract was shared below. Doors opened at 18:15, with a prompt start at 19:00.

.

**REGISTRATION NOTES**

The Dublin Java User Group meetups are designed to enhance the knowledge of developers and technology professionals.

Due to the overwhelming demand to attend our events they are always full so make sure you're subscribed to the wait-list to get the release notification of this and future Dublin Java User Group events.

Better still, email [email protected] and we'll tell you how to become a coveted Platinum Member of the Ireland's longest running, most respected and most active Java User Group.

##**MORE DUBLIN JAVA USER GROUP EVENTS**
**Java developers who are interested in this meetup are also attending other Dublin Java User Group meetups - check them at** [**DubJUG.org**](http://dubjug.org)

Our first DubJUG in June saw a ‘tune-in’ to vJUG’s online meetup with James Strachan, where he covered Jenkins X, followed by a presentation on Java 8 Streams by local developer and DubJUG Platinum Member Anton Balaniuc.

The full talk abstracts were shared below.

.

**REGISTRATION NOTES**

The Dublin Java User Group meetups are designed to enhance the knowledge of developers and technology professionals.

Due to the overwhelming demand to attend our events they are always full so make sure you're subscribed to the wait-list to get the release notification of this and future Dublin Java User Group events.

Better still, email [email protected] and we'll tell you how to become a coveted Platinum Member of the Ireland's longest running, most respected and most active Java User Group.

**Doors for this event open at 16:30. If you can't make this early start time tune-in to the [vJUG stream here](http://virtualjug.com/)**

##**MORE DUBLIN JAVA USER GROUP EVENTS**
**Java developers who are interested in this meetup are also attending other Dublin Java User Group meetups - check them at** [**DubJUG.org**](http://dubjug.org)

For the DubJUG May event, we welcomed back Brian Matthews, long-term DubJUG member and now JUG leader in Rostov-on-Don, Russia, who presented on building reactive microservices using the soon-to-be-released 2.0 version of Spring Boot, along with cloud-native applications.

The full talk abstracts were shared below.


.

**REGISTRATION NOTES**

The Dublin Java User Group meetups are designed to enhance the knowledge of developers and technology professionals.

Due to the overwhelming demand to attend our events they are always full so make sure you're subscribed to the wait-list to get the release notification of this and future Dublin Java User Group events.

Better still, email [email protected] and we'll tell you how to become a coveted Platinum Member of the Ireland's longest running, most respected and most active Java User Group.

##**MORE DUBLIN JAVA USER GROUP EVENTS**
**Java developers who are interested in this meetup are also attending other Dublin Java User Group meetups - check them at** [**DubJUG.org**](http://dubjug.org)

Our April event welcomed fellow and Director of Technology Outreach at Luminis, Bert Ertman. A frequent speaker on Java, cloud, and software architecture all over the world, Bert is a book author and serial conference organizer. Bert Ertman was awarded the coveted title of Java Champion in 2008, and is a JavaOne RockStar speaker and Duke’s Choice award winner.

# **Serverless Deep Dive**

##Doors Open 18:15 (evening session)

.

##**Serverless Deep Dive**

No server can be more easily managed than no server. Therefore: meet Serverless, a paradigm that truly approaches the Pay-as-You-Go philosophy once promised by the Cloud.

In this deep dive Bert will explore the Serverless paradigm by diving into the Serverless manifesto first and by explaining the differences between Serverless, FaaS, and PaaS., and then looking at the different Cloud vendors and what they have to offer in the Serverless space.

After the theoretical first part, Bert will start developing some functions with AWS Lambda, since it is, he says, by far the easiest entry point into the world of Serverless. Then he will take a step back to discuss how existing architectures (ie modern web applications) will be impacted. Where does it actually make sense to use this kind of technology and where doesn't it.

Finally Bert will end with a number of drawbacks to consider and to make it a balanced story of both pros and cons.

Besides AWS Lambda, he'll look at alternatives like Apache OpenWhisk and recently announced Project Fn as well.

This talk thoroughly explores Serverless, its impact on existing architectures, and assesses it's usability for Mobile Back-ends as a Service (MBaaS), Functions-as-a-Service (FaaS) and for Microservices hosted in the cloud. Internet connectivity permitting, there will be lots of demos too..

You can follow Bert on twitter at [**@BertErtman**](https://twitter.com/BertErtman), [**@Lumiis\_EU**](https://twitter.com/Luminis_eu)

# **The Dublin Java User Group - Sponsor Messages**

**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?**](https://recruit.zoho.com/recruit/ViewJob.na?digest=7NZDPrAwelZRR7pgbV1JQlg7fAI9NqhUofQ6ctM2P.8-&embedsource=Embed)

Website: [**Stackand.Co**](http://stackand.co) / Twitter: [**StackanddotCo**](https://twitter.com/stackanddotco)

.

**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.

New courses for 2018 include Blockchain with Ethereum / Corda (presented by Ben Evans), Machine Learning for Java and Python developers, IoT, GDPR, Hands-on Web Security for Java Developers as well as Modern Security with Ben Evans, Angular 5 and more

Website: [**GuruTeamIrl.com**](http://guruteamirl.com) / Twitter: [**GuruTeamIreland**](https://twitter.com/guruteamireland)

.

**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**](https://equifax.com) / Twitter: [**Equifax**](https://twitter.com/equifax)

.

**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.”

Website: [**Version1.com**](https://version1.com) / Twitter: [**Version1Tweets**](https://twitter.com/Version1Tweets)

.

**Teckro** are rethinking every element of clinical research - the people, the processes, the technologies used. By making it possible for all relevant information to be instantly accessible to every active member of a clinical trial and for the entire study teams to be connected effortlessly, they are broadening the possibilities of what can be achieved. This means drugs and treatments for the world’s most complex diseases are being developed quicker, and Teckro's long-term goal of continuously improving healthcare for everyone is realised.

Teckro's partnership with DubJUG means that they can interact and exchange ideas with some of Dublin’s best developers.

Website: [**Teckro.com**](http://Teckro.com) / Twitter: [**TeckroOfficial**](https://twitter.com/teckroofficial?lang=en)

.

**Sonorplex** add the edge to event attendance with their innovative 'Mark and Review' video platform. Download the Sonorplex app on your smartphone, attend DubJUG, and click points of interest in realtime. Your own personal 'marked' copy will be available for reviewing within hours, allowing you to relive the presentations again and again!

Website: [**Sonorplex.com**](https://sonorplex.com) / Twitter: [**Sonorplex**](https://twitter.com/sonorplex)

.

**tcube** provides city-centre co-working / hotdesks and fully serviced office space for ICT professionals and companies specifically. Their community knits so well together remote workers, contractors, city visitors and entrepreneurs / startups immediately become a part of a network of like-minded people who are able and willing to help one another. Offices in Fleet Street, Trinity Street and Grafton Street provide great locations with a huge benefit when it comes to hiring and retaining millennials.

Website: [**tcubedublin.com**](https://tcubedublin.com) / Twitter: [**tcubeDublin**](https://twitter.com/tcubedublin)

.
##**REGISTRATION NOTES**

The Dublin Java User Group meetups are designed to enhance the knowledge of developers and technology professionals.

Due to the overwhelming demand to attend our events they are always full so make sure you're subscribed to the wait-list to get the release notification of this and future Dublin Java User Group events.

Better still, email [email protected] and we'll tell you how to become a coveted platinum member of the Ireland's longest running and most respected Java User Group.

We reserve the right to cancel bookings if the attendee is not aligned to the intended audience. No refunds for cancellations, no-shows or misalignments.

##**MORE DUBLIN JAVA USER GROUP EVENTS**
**Java developers who are interested in this meetup are also attending other Dublin Java User Group meetups - check them at** [**DubJUG.org**](http://dubjug.org)

We welcomed a Virtual Java User Group screening at the Dublin Java User Group.

##Marcus Biel

# **A Craftsman’s Guide to Designing a Clean Architecture**

##Doors Open 16:30 for 17:00 start.
.

In 2018, it seems like Microservices are the de facto standard for a system architecture, but do they really live up to the hype?

The talk will show you an alternative approach - how we can tame complexity with the help of a clean, monolithic architecture that is modular to the core. Java has been deliberately built from the ground up on a modular basis: Methods, classes, packages. Additionally, the module system was introduced in Java 9. Modularity is based on the fundamental concepts of high cohesion and low coupling. We will look at these concepts, as well as some further measures, in detail. We'll check out what they are, how they are related to one another, and what the best practices are for applying them on all levels of the architecture.

The talk will show you how you can apply these basic concepts to develop a clean, monolithic architecture, based on Java 9 modules and the hexagonal architecture pattern. Finally, we'll learn how to achieve a clean microservice architecture based on a modular architecture.

About Marcus Biel

Marcus is a Clean Code evangelist who has authored a series of video tutorials that focus on teaching others how to create the cleanest and most well-structured code possible. As a conference speaker, he shares his ideas on Java Clean Code development. Marcus is also an author, technical book reviewer and JCP member. In 2017, Marcus was named TOP 13 Java influencer worldwide by jaxenter.com (http://bit.ly/top20JavaInfluencers). On his website Clean Code Academy, he offers comprehensive online training for Java Clean Coding (https://join.cleancodeacademy.com/).

You can follow Marcus on twitter at [**@MarcusBiel**](https://twitter.com/marcusbiel)

# **The Dublin Java User Group - Sponsor Messages**

**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?**](https://recruit.zoho.com/recruit/ViewJob.na?digest=7NZDPrAwelZRR7pgbV1JQlg7fAI9NqhUofQ6ctM2P.8-&embedsource=Embed)

Website: [**Stackand.Co**](http://stackand.co) / Twitter: [**StackanddotCo**](https://twitter.com/stackanddotco)

.

**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.

New courses for 2018 include Blockchain with Ethereum / Corda (presented by Ben Evans), Machine Learning for Java and Python developers, IoT, GDPR, Hands-on Web Security for Java Developers as well as Modern Security with Ben Evans, Angular 5 and more

Website: [**GuruTeamIrl.com**](http://guruteamirl.com) / Twitter: [**GuruTeamIreland**](https://twitter.com/guruteamireland)

.

**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**](https://equifax.com) / Twitter: [**Equifax**](https://twitter.com/equifax)

.

**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.”

Website: [**Version1.com**](https://version1.com) / Twitter: [**Version1Tweets**](https://twitter.com/Version1Tweets)

.

**Teckro** are rethinking every element of clinical research - the people, the processes, the technologies used. By making it possible for all relevant information to be instantly accessible to every active member of a clinical trial and for the entire study teams to be connected effortlessly, they are broadening the possibilities of what can be achieved. This means drugs and treatments for the world’s most complex diseases are being developed quicker, and Teckro's long-term goal of continuously improving healthcare for everyone is realised.

Teckro's partnership with DubJUG means that they can interact and exchange ideas with some of Dublin’s best developers.

Website: [**Teckro.com**](http://Teckro.com) / Twitter: [**TeckroOfficial**](https://twitter.com/teckroofficial?lang=en)

.

**Sonorplex** add the edge to event attendance with their innovative 'Mark and Review' video platform. Download the Sonorplex app on your smartphone, attend DubJUG, and click points of interest in realtime. Your own personal 'marked' copy will be available for reviewing within hours, allowing you to relive the presentations again and again!

Website: [**Sonorplex.com**](https://sonorplex.com) / Twitter: [**Sonorplex**](https://twitter.com/sonorplex)

.

**tcube** provides city-centre co-working / hotdesks and fully serviced office space for ICT professionals and companies specifically. Their community knits so well together remote workers, contractors, city visitors and entrepreneurs / startups immediately become a part of a network of like-minded people who are able and willing to help one another. Offices in Fleet Street, Trinity Street and Grafton Street provide great locations with a huge benefit when it comes to hiring and retaining millennials.

Website: [**tcubedublin.com**](https://tcubedublin.com) / Twitter: [**tcubeDublin**](https://twitter.com/tcubedublin)

.
##**REGISTRATION NOTES**

The Dublin Java User Group meetups are designed to enhance the knowledge of developers and technology professionals.

Due to the overwhelming demand to attend our events they are always full so make sure you're subscribed to the wait-list to get the release notification of this and future Dublin Java User Group events.

Better still, email [email protected] and we'll tell you how to become a coveted platinum member of the Ireland's longest running and most respected Java User Group.

We reserve the right to cancel bookings if the attendee is not aligned to the intended audience. No refunds for cancellations, no-shows or misalignments.

##**MORE DUBLIN JAVA USER GROUP EVENTS**
**Java developers who are interested in this meetup are also attending other Dublin Java User Group meetups - check them at** [**DubJUG.org**](http://dubjug.org)

.
On the evening of 11th April, DubJUG co-lead Barry Evans ran a workshop built upon a session he attended at JavaOne.

Barry presented *Starting Out with JUnit 5*.

Doors opened at 18:15 (evening session).


.

Barry's workshop builds upon a JavaOne session he attended that was run by Jeanne Boyarsky, author of the official Oracle OCA/OCP study guides.

The difference between JUnit 4 and 5 is far bigger than the difference between 3 and 4. [**JUnit 5 was released**](https://junit.org/junit5/docs/5.0.0/user-guide/#release-notes-5.0.0) on 10th September 2017, so it is high time to learn about next-generation JUnit.

Attendees in this session will migrate a JUnit 4 application to JUnit 5, while learning what’s changed and the new styles of unit testing that JUnit 5 enables.

**NOTE: THIS IS A BRING YOUR OWN LAPTOP HANDS-ON LAB.**
.

**About Barry**

Barry is a seasoned web application engineer with over ten years experience developing enterprise applications in the financial sector. Presently, he is an Oracle Certified Senior Applications Consultant at DubJUG partner Version 1.

Barry is interested in meeting other JUG leaders, finding out what brings Java developers together, and to help the Dublin JUG in Ireland grow by getting involved with the global Java community.

You can follow him on twitter at [**@Bazza\_NI**](https://twitter.com/bazza_ni)

# **The Dublin Java User Group - Sponsor Messages**

**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?**](https://recruit.zoho.com/recruit/ViewJob.na?digest=7NZDPrAwelZRR7pgbV1JQlg7fAI9NqhUofQ6ctM2P.8-&embedsource=Embed)

Website: [**Stackand.Co**](http://stackand.co) / Twitter: [**StackanddotCo**](https://twitter.com/stackanddotco)

.

**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**](https://equifax.com) / Twitter: [**Equifax**](https://twitter.com/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.

New courses for 2018 include Blockchain with Ethereum / Corda (presented by Ben Evans), Machine Learning for Java and Python developers, IoT, GDPR, Hands-on Web Security for Java Developers as well as Modern Security with Ben Evans, Angular 5 and more

Website: [**GuruTeamIrl.com**](http://guruteamirl.com) / Twitter: [**GuruTeamIreland**](https://twitter.com/guruteamireland)

.

**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.”

Website: [**Version1.com**](https://version1.com) / Twitter: [**Version1Tweets**](https://twitter.com/Version1Tweets)

.

**Teckro** are rethinking every element of clinical research - the people, the processes, the technologies used. By making it possible for all relevant information to be instantly accessible to every active member of a clinical trial and for the entire study teams to be connected effortlessly, they are broadening the possibilities of what can be achieved. This means drugs and treatments for the world’s most complex diseases are being developed quicker, and Teckro's long-term goal of continuously improving healthcare for everyone is realised.

Teckro's partnership with DubJUG means that they can interact and exchange ideas with some of Dublin’s best developers.

Website: [**Teckro.com**](http://Teckro.com) / Twitter: [**TeckroOfficial**](https://twitter.com/teckroofficial?lang=en)

.

**Sonorplex** add the edge to event attendance with their innovative 'Mark and Review' video platform. Download the Sonorplex app on your smartphone, attend DubJUG, and click points of interest in realtime. Your own personal 'marked' copy will be available for reviewing within hours, allowing you to relive the presentations again and again!

Website: [**Sonorplex.com**](https://sonorplex.com) / Twitter: [**Sonorplex**](https://twitter.com/sonorplex)

.

**tcube** provides city-centre co-working / hotdesks and fully serviced office space for ICT professionals and companies specifically. Their community knits so well together remote workers, contractors, city visitors and entrepreneurs / startups immediately become a part of a network of like-minded people who are able and willing to help one another. Offices in Fleet Street, Trinity Street and Grafton Street provide great locations with a huge benefit when it comes to hiring and retaining millennials.

Website: [**tcubedublin.com**](https://tcubedublin.com) / Twitter: [**tcubeDublin**](https://twitter.com/tcubedublin)

.
##**REGISTRATION NOTES**

The Dublin Java User Group meetups are designed to enhance the knowledge of developers and technology professionals.

Due to the overwhelming demand to attend our events they are always full so make sure you're subscribed to the wait-list to get the release notification of this and future Dublin Java User Group events.

Better still, email [email protected] and we'll tell you how to become a coveted platinum member of the Ireland's longest running and most respected Java User Group.

We reserve the right to cancel bookings if the attendee is not aligned to the intended audience. No refunds for cancellations, no-shows or misalignments.

##**MORE DUBLIN JAVA USER GROUP EVENTS**
**Java developers who are interested in this meetup are also attending other Dublin Java User Group meetups - check them at** [**DubJUG.org**](http://dubjug.org)

[**SORRY EVENT FINISHED - CLICK HERE TO VIEW UPCOMING JAVA EVENTS**](https://ti.to/dublin-java-user-group/)

Our March event was special! We hosted Java Champion and JavaOne Rockstar Simon Maple, Virtual JUG founder, London Java Community co-leader, RebelLabs author, and Duke’s Choice award winner.

Simon presented..

# **Do You Really Get Class Loaders**

##and

# **Productive and Effective Development with Spring and Java EE**

##Doors Open 18:15 (evening session)

.

Simon is an experienced speaker, having presented at JavaOne, JavaZone, Jfokus, DevoxxUK, DevoxxFR, JavaZone, JMaghreb and many more including many JUG tours. His passion is around user groups and communities.

When not traveling, Simon enjoys spending quality time with his family, cooking and eating great food.

You can follow him on twitter at [**@sjmaple**](https://twitter.com/sjmaple) and[**@virtualjug**](https://twitter.com/virtualjug)
.

##**Do You Really Get Class Loaders**

Class loaders are at the core of the Java language. Java EE containers, OSGi, NetBeans modules, Tapestry 5, Grails, and many others use class loaders heavily. Yet if something went wrong, would you know how to solve it?

This session takes a tour of the Java class loading mechanism, from both the JVM and developer points of view.

It looks at typical class loading problems and how to solve them. ClassNoDefError, IncompatibleClassChangeError, LinkageError, and many others are symptoms of specific things going wrong that you can usually find and fix.

For each problem, the presentation goes through a hands-on demo with a corresponding solution. It also takes a look at how and why class loaders leak and how you can remedy that.

##**Productive and Effective Development with Spring and Java EE**

This live coding session shines some light on a range of productivity tools that make software development a pleasure rather than a chore.

Simon will live-code two applications. The first, a Java EE application with JBoss Forge that uses JPA, Bean Validation, REST, and Angular, is tested with Arquillian from within JBoss Forge. You’ll see how a Java EE microservice can be developed in Forge and run with JBoss Swarm.

The second application is developed on Spring Boot, and you’ll see how to develop and run a Spring application with JRebel. You’ll learn how to write code productively with tools designed for developers.

.

# **The Dublin Java User Group - Sponsor Messages**

**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?**](https://recruit.zoho.com/recruit/ViewJob.na?digest=7NZDPrAwelZRR7pgbV1JQlg7fAI9NqhUofQ6ctM2P.8-&embedsource=Embed)

Website: [**Stackand.Co**](http://stackand.co) / Twitter: [**StackanddotCo**](https://twitter.com/stackanddotco)

.

**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**](https://equifax.com) / Twitter: [**Equifax**](https://twitter.com/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.

New courses for 2018 include Blockchain with Ethereum / Corda (presented by Ben Evans), Machine Learning for Java and Python developers, IoT, GDPR, Hands-on Web Security for Java Developers as well as Modern Security with Ben Evans, Angular 5 and more

Website: [**GuruTeamIrl.com**](http://guruteamirl.com) / Twitter: [**GuruTeamIreland**](https://twitter.com/guruteamireland)

.

**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.”

Website: [**Version1.com**](https://version1.com) / Twitter: [**Version1Tweets**](https://twitter.com/Version1Tweets)

.

**Teckro** are rethinking every element of clinical research - the people, the processes, the technologies used. By making it possible for all relevant information to be instantly accessible to every active member of a clinical trial and for the entire study teams to be connected effortlessly, they are broadening the possibilities of what can be achieved. This means drugs and treatments for the world’s most complex diseases are being developed quicker, and Teckro's long-term goal of continuously improving healthcare for everyone is realised.

Teckro's partnership with DubJUG means that they can interact and exchange ideas with some of Dublin’s best developers.

Website: [**Teckro.com**](http://Teckro.com) / Twitter: [**TeckroOfficial**](https://twitter.com/teckroofficial?lang=en)

.

**Sonorplex** add the edge to event attendance with their innovative 'Mark and Review' video platform. Download the Sonorplex app on your smartphone, attend DubJUG, and click points of interest in realtime. Your own personal 'marked' copy will be available for reviewing within hours, allowing you to relive the presentations again and again!

Website: [**Sonorplex.com**](https://sonorplex.com) / Twitter: [**Sonorplex**](https://twitter.com/sonorplex)

.

**tcube** provides city-centre co-working / hotdesks and fully serviced office space for ICT professionals and companies specifically. Their community knits so well together remote workers, contractors, city visitors and entrepreneurs / startups immediately become a part of a network of like-minded people who are able and willing to help one another. Offices in Fleet Street, Trinity Street and Grafton Street provide great locations with a huge benefit when it comes to hiring and retaining millennials.

Website: [**tcubedublin.com**](https://tcubedublin.com) / Twitter: [**tcubeDublin**](https://twitter.com/tcubedublin)

.
##**REGISTRATION NOTES**

The Dublin Java User Group meetups are designed to enhance the knowledge of developers and technology professionals.

Due to the overwhelming demand to attend our events they are always full so make sure you're subscribed to the wait-list to get the release notification of this and future Dublin Java User Group events.

Better still, email [email protected] and we'll tell you how to become a coveted platinum member of the Ireland's longest running and most respected Java User Group.

We reserve the right to cancel bookings if the attendee is not aligned to the intended audience. No refunds for cancellations, no-shows or misalignments.

##**MORE DUBLIN JAVA USER GROUP EVENTS**
**Java developers who are interested in this meetup are also attending other Dublin Java User Group meetups - check them at** [**DubJUG.org**](http://dubjug.org)

[**SORRY EVENT FINISHED - CLICK HERE TO VIEW UPCOMING JAVA EVENTS**](https://ti.to/dublin-java-user-group/)

For our second DubJUG event of 2018, we were very honoured to have Java Champion, JavaOne Rockstar, and leader of the NLJUG, Bert Jan Schrijver, come to Dublin to share his immense knowledge with our community. But this was not academic stuff! He shared real-life project cases, discussed why and how the Dutch National Police force implemented microservices, and why a startup uses the Vert.x event-driven, non-blocking, and polyglot toolkit for building reactive applications.

Bert Jan presented...

# **Microservices in Action at the Dutch National Police**

##and

# **Building Microservices with Vert.x**

##Doors Open 18:15 (evening session)

.
.

#**About Bert Jan Schrijver**

Bert Jan is a software craftsman at Dutch software consultancy JPoint and CTO at OpenValue. He has a strong focus on Java, Continuous Delivery and DevOps.

Bert Jan is a Java Champion, JavaOne Rock Star speaker and user group leader for NLJUG, the Dutch Java User Group. He loves to share his experience by speaking at conferences, writing for the Dutch Java magazine and helping out Devoxx4Kids with teaching kids how to code.

Follow Bert Jan on twitter at [**@bjschrijver**](https://twitter.com/bjschrijver)

.
.

# **Microservices in Action at the Dutch National Police**

Microservices? At the Police? Definitely!

At the Cloud, Big Data and Internet division of the Dutch National Police, 3 DevOps teams use the latest open source technology to build high tech web applications. These applications are used to support digital investigation and incident response with data from open, online sources and are built using Spring Boot, Angular 2.x, Spark, Kafka and Jenkins 2.

In this session, Bert Jan will share their experiences and real-world use cases for microservices. He will explain the architecture, why it was chosen, which challenges were faced and how this brought the three teams together to work on one product, loosely based on the models used by Spotify and Netflix.

Bert Jan will also share how the principles of DevOps and Continuous Delivery were applied, and how security, build pipelines, test automation, performance tests, automated deployments and monitoring were handled.

You'll leave this session with an understanding of how this approach enabled the team to have the agility of a startup within the large Police organisation.
.

# **Building Microservices with Vert.x**

Vert.x is a toolkit for building reactive applications on the JVM. It is event driven, non blocking and polyglot, which makes it an excellent platform for building microservices. It was awarded for 'Most Innovative Java Technology' at the JAX Innovation awards.

In this talk, Bert Jan will share experiences and real-world use cases from a Dutch company that started building reactive web applications with Vert.x about 4 years ago. You'll learn the concepts behind Vert.x, why Vert.x was chosen, how it is being used and the challenges that were faced.

Topics include the anatomy of the projects, (micro)services architecture, deployment model and DevOps, scalability, the upgrade from Vert.x 2 to Vert.x 3 and cooperation with the team behind Vert.x.

At the end of this session, you'll know enough about Vert.x to get started yourself right away!

.

##**REGISTRATION NOTES**

The Dublin Java User Group meetups are designed to enhance the knowledge of developers and technology professionals.

Due to the overwhelming demand to attend our events they are always full. On occasion, a small attendance fee may be required.

The organisers reserve the right to cancel the booking if the attendee is not aligned to the intended audience.

# **The Dublin Java User Group - Sponsor Messages**

**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?**](https://recruit.zoho.com/recruit/ViewJob.na?digest=7NZDPrAwelZRR7pgbV1JQlg7fAI9NqhUofQ6ctM2P.8-&embedsource=Embed)

Website: [**Stackand.Co**](http://stackand.co) / Twitter: [**StackanddotCo**](https://twitter.com/stackanddotco)

.

**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**](https://equifax.com) / Twitter: [**Equifax**](https://twitter.com/equifax)

.

**GuruTeam's** 'crème de la crème' instructors deliver an enthusing and valuable learning experience, equipping attendees with the vital skills applicable to their careers, and bringing true business value to organisations they work with.

Upcoming courses include CI with Jenkins, Apache Hadoop, Data Science & Big Data Analytics, Spring, GIT, Linux Foundation™, Angular 2, and OpenStack™

Website: [**GuruTeamIrl.com**](http://guruteamirl.com) / Twitter: [**GuruTeamIreland**](https://twitter.com/guruteamireland)

.

**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.”

Website: [**Version1.com**](https://version1.com) / Twitter: [**Version1Tweets**](https://twitter.com/Version1Tweets)

.

**Teckro** are rethinking every element of clinical research - the people, the processes, the technologies used. By making it possible for all relevant information to be instantly accessible to every active member of a clinical trial and for the entire study teams to be connected effortlessly, they are broadening the possibilities of what can be achieved. This means drugs and treatments for the world’s most complex diseases are being developed quicker, and Teckro's long-term goal of continuously improving healthcare for everyone is realised.

Teckro's partnership with DubJUG means that they can interact and exchange ideas with some of Dublin’s best developers.

Website: [**Teckro.com**](http://Teckro.com) / Twitter: [**TeckroOfficial**](https://twitter.com/teckroofficial?lang=en)

.

**Sonorplex** add the edge to event attendance with their innovative 'Mark and Review' video platform. Download the Sonorplex app on your smartphone, attend DubJUG, and click points of interest in realtime. Your own personal 'marked' copy will be available for reviewing within hours, allowing you to relive the presentations again and again!

Website: [**Sonorplex.com**](https://sonorplex.com) / Twitter: [**Sonorplex**](https://twitter.com/sonorplex)

.

**tcube** provides city-centre co-working / hotdesks and fully serviced office space for ICT professionals and companies specifically. Their community knits so well together remote workers, contractors, city visitors and entrepreneurs / startups immediately become a part of a network of like-minded people who are able and willing to help one another. Offices in Fleet Street, Trinity Street and Grafton Street provide great locations with a huge benefit when it comes to hiring and retaining millennials.

Website: [**tcubedublin.com**](https://tcubedublin.com) / Twitter: [**tcubeDublin**](https://twitter.com/tcubedublin)

.

##**MORE DUBLIN JAVA USER GROUP EVENTS**
**Java developers who are interested in this meetup are also attending other Dublin Java User Group meetups - check them at** [**DubJUG.org**](http://dubjug.org)

[**SORRY EVENT FINISHED - CLICK HERE TO VIEW UPCOMING JAVA EVENTS**](https://ti.to/dublin-java-user-group/)

With Java 8 EE taking way longer to release than first expected, it seemed like Java 9 EE could have been some time off, and since there were many companies in Dublin using Java 7, their engineers were interested in our first DubJUG event of 2018, which saw Senior Java EE Engineer Roberto Cortez from the Seattle-based startup Tomitribe talk about how Java EE 7 meets Java 8, and clustering MicroProfile applications using CDI and JCache.

Roberto presented...

# **Java EE 7 Meets Java 8**

##and

# **Cluster your MicroProfile Application using CDI and JCache**

##Doors Open 18:15 (evening session)

.
.

#**About Roberto Cortez**

Robert was born in Venezuela, but has spent most of his life in Coimbra, Portugal. With a degree in Informatics Engineering (equivalent to the Bologna Master’s degree) from the Department of Informatics Engineering of the University of Coimbra, he has been working as a Java Developer for 10 years in business areas like Finance, Insurance and Government.

Roberto works with many Java based technologies like JavaEE, Spring, Hibernate, GWT, JBoss AS and Maven just to name a few, always relying on IntelliJ IDEA, which he says is his favourite IDE.

As a Freelancer / Independent Contractor he travels the world to customers, but also to speak at Java conferences. The direct contact with the Java community made him want to become an active member in the community itself. For that reason, he created the Coimbra Java User Group, and started to contribute to Open Source on Github so he can share some of the knowledge that he has gained over the years.

After working for a few major corporations, he became eager to help and grow something from the ground up, so currently works with Seattle based start-up Tomitribe which focus on developing and supporting TomEE, a Java Application server based on Tomcat with Java EE support.

Follow Roberto on twitter at [**@radcortez**](https://twitter.com/radcortez)

.
.

# **Java EE 7 Meets Java 8**

The last few years have been pretty exciting for Java with new versions of EE and SE platforms.

Java EE, introduced a new API to build WebSockets; a new API to parse, process and generate JSON; a new Client API in JAX-RS to invoke REST services, and finally the Batch Processing API to build batch applications.

Java SE brought us the long awaited Lambda expressions; the powerful Streams API to perform operations like filtering, mapping or sorting in a very easy and fluent way, and a brand new Date Time API, to deal with the complexities of Timezones and Periods.

This session will combine all of these elements together and show you how to easily develop an application using Java SE 8 with Java EE 7, with live coding and samples.

.
.

# **Cluster your MicroProfile Application using CDI and JCache**

Microprofile is a new platform definition that optimizes Enterprise Java for a Microservices Architecture and delivers application portability across multiple runtimes. You can use a subset of the Java EE specifications to develop Microprofile applications, with JAX-RS, CDI and JSON-P. Now you need to make it highly available and scalable across a large number of machines.

The session will feature a live coding demo where we will turn this Microprofile application, into a fully clustered application using only standard Java API’s. Finally, to show you how light it is, we will run the entire cluster in a set up of Raspberry PI’s.

##**REGISTRATION NOTES**

The Dublin Java User Group meetups are designed to enhance the knowledge of developers and technology professionals.

Due to the overwhelming demand to attend our events they are always full. On occasion, a small attendance fee may be required.

The organisers reserve the right to cancel the booking if the attendee is not aligned to the intended audience.

# **The Dublin Java User Group - Sponsor Messages**

**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?**](https://recruit.zoho.com/recruit/ViewJob.na?digest=7NZDPrAwelZRR7pgbV1JQlg7fAI9NqhUofQ6ctM2P.8-&embedsource=Embed)

Website: [**Stackand.Co**](http://stackand.co) / Twitter: [**StackanddotCo**](https://twitter.com/stackanddotco)

.

**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**](https://equifax.com) / Twitter: [**Equifax**](https://twitter.com/equifax)

.

**GuruTeam's** 'crème de la crème' instructors deliver an enthusing and valuable learning experience, equipping attendees with the vital skills applicable to their careers, and bringing true business value to organisations they work with.

Upcoming courses include CI with Jenkins, Apache Hadoop, Data Science & Big Data Analytics, Spring, GIT, Linux Foundation™, Angular 2, and OpenStack™

Website: [**GuruTeamIrl.com**](http://guruteamirl.com) / Twitter: [**GuruTeamIreland**](https://twitter.com/guruteamireland)

.

**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.”

Website: [**Version1.com**](https://version1.com) / Twitter: [**Version1Tweets**](https://twitter.com/Version1Tweets)

.

**Teckro** are rethinking every element of clinical research - the people, the processes, the technologies used. By making it possible for all relevant information to be instantly accessible to every active member of a clinical trial and for the entire study teams to be connected effortlessly, they are broadening the possibilities of what can be achieved. This means drugs and treatments for the world’s most complex diseases are being developed quicker, and Teckro's long-term goal of continuously improving healthcare for everyone is realised.

Teckro's partnership with DubJUG means that they can interact and exchange ideas with some of Dublin’s best developers.

Website: [**Teckro.com**](http://Teckro.com) / Twitter: [**TeckroOfficial**](https://twitter.com/teckroofficial?lang=en)

.

**Sonorplex** add the edge to event attendance with their innovative 'Mark and Review' video platform. Download the Sonorplex app on your smartphone, attend DubJUG, and click points of interest in realtime. Your own personal 'marked' copy will be available for reviewing within hours, allowing you to relive the presentations again and again!

Website: [**Sonorplex.com**](https://sonorplex.com) / Twitter: [**Sonorplex**](https://twitter.com/sonorplex)

.

**tcube** provides city-centre co-working / hotdesks and fully serviced office space for ICT professionals and companies specifically. Their community knits so well together remote workers, contractors, city visitors and entrepreneurs / startups immediately become a part of a network of like-minded people who are able and willing to help one another. Offices in Fleet Street, Trinity Street and Grafton Street provide great locations with a huge benefit when it comes to hiring and retaining millennials.

Website: [**tcubedublin.com**](https://tcubedublin.com) / Twitter: [**tcubeDublin**](https://twitter.com/tcubedublin)

.

##**MORE DUBLIN JAVA USER GROUP EVENTS**
**Java developers who are interested in this meetup are also attending other Dublin Java User Group meetups - check them at** [**DubJUG.org**](http://dubjug.org)

[**SORRY EVENT FINISHED - CLICK HERE TO VIEW UPCOMING JAVA EVENTS**](https://ti.to/dublin-java-user-group/)

Our last event of 2017 saw Barry Evans and Rafael Chinelato Del Nero present *10 Java Challenges*, an interactive Java quiz that stretched attendees’ grey matter. Representing the Dublin Java User Group, the duo had first presented *Java Challenges* at JavaOne and had since put developers in Belfast, Brazil, and Bangladesh to the test — so it was about time they challenged you guys in Dublin too. Well done to Synchronoss guys Brian Matthews and Fatih Aydin, who scored 8/10!

# **Java Challenges**

##by

# **Barry Evans and Rafael Chinelato Del Nero**

##Doors Open 18:15

**Your Speakers**

**Barry Evans** is a seasoned web application engineer with over 10 years experience developing enterprise applications predominantly in the financial sector. Presently, he is an Oracle Certified Senior Applications Consultant at DubJUG partner Version 1, where he has been using Java SE, Spring, and ORM to build middleware for RIA apps written in Adobe Flex & AS3, Angular JS, and HTML 5.

Recently OCP Java SE 8 certified, he is keen to increase his knowledge with Java EE and is working towards the OCMJEA certification.

Barry is also interested in meeting other JUG leaders, finding out what brings Java developers together, and to help the Dublin JUG in Ireland grow by getting involved with the global Java community.

You can follow him on twitter at [**@Bazza\_NI**](https://twitter.com/bazza_ni)

.

**Rafael Chinelato Del Nero** believes there are many techniques involved in creating high-quality software that developers are often unaware of. His life's purpose is to help Java developers use best programming practices to code quality software for stress-free projects with fewer bugs

He is creator of [**NoBugsProject**](https://twitter.com/search?q=nobugsproject&src=typd), and is the author of "No Bugs, No Stress - Create a Life Changing Software Without Destroying Your Life."

You can follow him on twitter at [**@RafaDelNero**](https://twitter.com/RafaDelNero)

.

##**Java Challenges - Learn the Concepts Behind 10 Java Challenges and Eliminate Stressful Bugs**

Bugs are a daily stress in our work as Java developers. Those pesky bugs hide behind important Java concepts; there is no way out of this.

**But can we have fun hunting them? You bet!**

How about solving a series of Java puzzles and challenges as a way to learn concepts and save a lot of time finding those tricky bugs?

Together with Barry and Rafael, attendees can solve fun Java challenges and gain a clear understanding of what causes the most stressful Java bugs—and have fun eliminating them from your projects.

##**REGISTRATION NOTES**

The Dublin Java User Group meetups are designed to enhance the knowledge of developers and technology professionals.

Due to the overwhelming demand to attend our events they are always full. On occasion, a small attendance fee may be required.

The organisers reserve the right to cancel the booking if the attendee is not aligned to the intended audience.

# **The Dublin Java User Group - Sponsor Messages**

**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?**](https://recruit.zoho.com/recruit/ViewJob.na?digest=7NZDPrAwelZRR7pgbV1JQlg7fAI9NqhUofQ6ctM2P.8-&embedsource=Embed)

Website: [**Stackand.Co**](http://stackand.co) / Twitter: [**StackanddotCo**](https://twitter.com/stackanddotco)

.

**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**](https://equifax.com) / Twitter: [**Equifax**](https://twitter.com/equifax)

.

**GuruTeam's** 'crème de la crème' instructors deliver an enthusing and valuable learning experience, equipping attendees with the vital skills applicable to their careers, and bringing true business value to organisations they work with.

Upcoming courses include CI with Jenkins, Apache Hadoop, Data Science & Big Data Analytics, Spring, GIT, Linux Foundation™, Angular 2, and OpenStack™

Website: [**GuruTeamIrl.com**](http://guruteamirl.com) / Twitter: [**GuruTeamIreland**](https://twitter.com/guruteamireland)

.

**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.”

Website: [**Version1.com**](https://version1.com) / Twitter: [**Version1Tweets**](https://twitter.com/Version1Tweets)

.

**Teckro** are rethinking every element of clinical research - the people, the processes, the technologies used. By making it possible for all relevant information to be instantly accessible to every active member of a clinical trial and for the entire study teams to be connected effortlessly, they are broadening the possibilities of what can be achieved. This means drugs and treatments for the world’s most complex diseases are being developed quicker, and Teckro's long-term goal of continuously improving healthcare for everyone is realised.

Teckro's partnership with DubJUG means that they can interact and exchange ideas with some of Dublin’s best developers.

Website: [**Teckro.com**](http://Teckro.com) / Twitter: [**TeckroOfficial**](https://twitter.com/teckroofficial?lang=en)

.

**Sonorplex** add the edge to event attendance with their innovative 'Mark and Review' video platform. Download the Sonorplex app on your smartphone, attend DubJUG, and click points of interest in realtime. Your own personal 'marked' copy will be available for reviewing within hours, allowing you to relive the presentations again and again!

Website: [**Sonorplex.com**](https://sonorplex.com) / Twitter: [**Sonorplex**](https://twitter.com/sonorplex)

.

**tcube** provides city-centre co-working / hotdesks and fully serviced office space for ICT professionals and companies specifically. Their community knits so well together remote workers, contractors, city visitors and entrepreneurs / startups immediately become a part of a network of like-minded people who are able and willing to help one another. Offices in Fleet Street, Trinity Street and Grafton Street provide great locations with a huge benefit when it comes to hiring and retaining millennials.

Website: [**tcubedublin.com**](https://tcubedublin.com) / Twitter: [**tcubeDublin**](https://twitter.com/tcubedublin)

.

##**MORE DUBLIN JAVA USER GROUP EVENTS**
**Java developers who are interested in this meetup are also attending other Dublin Java User Group meetups - check them at** [**DubJUG.org**](http://dubjug.org)

[**SORRY EVENT FINISHED - CLICK HERE TO VIEW UPCOMING JAVA EVENTS**](https://ti.to/dublin-java-user-group/)

Our March event was special! We hosted Java Champion and JavaOne Rockstar Simon Maple, founder of the Virtual JUG, co-leader of the London Java Community, RebelLabs author, and Duke’s Choice award winner.

Simon presented...

# **Do You Really Get Class Loaders**

##and

# **Productive and Effective Development with Spring and Java EE**

##Doors Open 18:15 (evening session)

.
Simon is an experienced speaker, having presented at JavaOne, JavaZone, Jfokus, DevoxxUK, DevoxxFR, JavaZone, JMaghreb and many more including many JUG tours. His passion is around user groups and communities.

When not traveling, Simon enjoys spending quality time with his family, cooking and eating great food.

You can follow him on twitter at [**@sjmaple**](https://twitter.com/sjmaple), [**@virtualjug**](https://twitter.com/virtualjug) and [**@zeroturnaround**](https://twitter.com/zeroturnaround)

.

##**Do You Really Get Class Loaders**

Class loaders are at the core of the Java language. Java EE containers, OSGi, NetBeans modules, Tapestry 5, Grails, and many others use class loaders heavily. Yet if something went wrong, would you know how to solve it?

This session takes a tour of the Java class loading mechanism, from both the JVM and developer points of view.

It looks at typical class loading problems and how to solve them. ClassNoDefError, IncompatibleClassChangeError, LinkageError, and many others are symptoms of specific things going wrong that you can usually find and fix.

For each problem, the presentation goes through a hands-on demo with a corresponding solution. It also takes a look at how and why class loaders leak and how you can remedy that.

##**Productive and Effective Development with Spring and Java EE**

This live coding session shines some light on a range of productivity tools that make software development a pleasure rather than a chore.

Simon will live-code two applications. The first, a Java EE application with JBoss Forge that uses JPA, Bean Validation, REST, and Angular, is tested with Arquillian from within JBoss Forge. You’ll see how a Java EE microservice can be developed in Forge and run with JBoss Swarm.

The second application is developed on Spring Boot, and you’ll see how to develop and run a Spring application with JRebel. You’ll learn how to write code productively with tools designed for developers.

.

##**REGISTRATION NOTES**

The Dublin Java User Group meetups are designed to enhance the knowledge of developers and technology professionals.

Due to the overwhelming demand to attend our events they are always full so make sure you're subscribed to the wait-list to get the release notification of this and future Dublin Java User Group events.

Better still, email [email protected] and we'll tell you how to become a coveted platinum member of the Ireland's longest running and most respected Java User Group.

We reserve the right to cancel bookings if the attendee is not aligned to the intended audience.

# **The Dublin Java User Group - Sponsor Messages**

**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?**](https://recruit.zoho.com/recruit/ViewJob.na?digest=7NZDPrAwelZRR7pgbV1JQlg7fAI9NqhUofQ6ctM2P.8-&embedsource=Embed)

Website: [**Stackand.Co**](http://stackand.co) / Twitter: [**StackanddotCo**](https://twitter.com/stackanddotco)

.

**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**](https://equifax.com) / Twitter: [**Equifax**](https://twitter.com/equifax)

.

**GuruTeam's** 'crème de la crème' instructors deliver an enthusing and valuable learning experience, equipping attendees with the vital skills applicable to their careers, and bringing true business value to organisations they work with.

Upcoming courses include CI with Jenkins, Apache Hadoop, Data Science & Big Data Analytics, Spring, GIT, Linux Foundation™, Angular 2, and OpenStack™

Website: [**GuruTeamIrl.com**](http://guruteamirl.com) / Twitter: [**GuruTeamIreland**](https://twitter.com/guruteamireland)

.

**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.”

Website: [**Version1.com**](https://version1.com) / Twitter: [**Version1Tweets**](https://twitter.com/Version1Tweets)

.

**Teckro** are rethinking every element of clinical research - the people, the processes, the technologies used. By making it possible for all relevant information to be instantly accessible to every active member of a clinical trial and for the entire study teams to be connected effortlessly, they are broadening the possibilities of what can be achieved. This means drugs and treatments for the world’s most complex diseases are being developed quicker, and Teckro's long-term goal of continuously improving healthcare for everyone is realised.

Teckro's partnership with DubJUG means that they can interact and exchange ideas with some of Dublin’s best developers.

Website: [**Teckro.com**](http://Teckro.com) / Twitter: [**TeckroOfficial**](https://twitter.com/teckroofficial?lang=en)

.

**Sonorplex** add the edge to event attendance with their innovative 'Mark and Review' video platform. Download the Sonorplex app on your smartphone, attend DubJUG, and click points of interest in realtime. Your own personal 'marked' copy will be available for reviewing within hours, allowing you to relive the presentations again and again!

Website: [**Sonorplex.com**](https://sonorplex.com) / Twitter: [**Sonorplex**](https://twitter.com/sonorplex)

.

**tcube** provides city-centre co-working / hotdesks and fully serviced office space for ICT professionals and companies specifically. Their community knits so well together remote workers, contractors, city visitors and entrepreneurs / startups immediately become a part of a network of like-minded people who are able and willing to help one another. Offices in Fleet Street, Trinity Street and Grafton Street provide great locations with a huge benefit when it comes to hiring and retaining millennials.

Website: [**tcubedublin.com**](https://tcubedublin.com) / Twitter: [**tcubeDublin**](https://twitter.com/tcubedublin)

.

##**MORE DUBLIN JAVA USER GROUP EVENTS**
**Java developers who are interested in this meetup are also attending other Dublin Java User Group meetups - check them at** [**DubJUG.org**](http://dubjug.org)

[**SORRY EVENT FINISHED - CLICK HERE TO VIEW UPCOMING JAVA EVENTS**](https://ti.to/dublin-java-user-group/)

Towards the end of November, we hosted the lead of the Eclipse Collections project, Nikhil Nanivadekar, as he whistle-stopped around Europe and beyond. Nikhil, who is also a VP at Goldman Sachs, was a regular sight at the world’s top Java conferences.

Nikhil presented...

# **How to Make a Project Java 9-Compatible**

##and

# **Collections.compare: JDK, Eclipse, Guava, Apache...**

##Doors Open 18:15 (evening session)

.
Nikhil Nanivadekar is a Vice President in Private Wealth Management in the Technology division of Goldman Sachs, and is also the project lead and committer for Eclipse Collections. He graduated in 2012 from University of Utah with a Masters in Mechanical Engineering with specialization in Robotics and Controls.

He has presented at JavaOne, DevoxxUS and Java User Group meetups. He is passionate about robotics has conducted robotics workshops at JCrete4Kids, JavaOne4Kids and Devoxx4Kids.

You can follow him on twitter at [**@NikhilNanivade**](https://twitter.com/NikhilNanivade)

.

##**How to Make a Project Java 9-Compatible**

Java 9 brings numerous changes that might break existing applications. This presentation is a case study of making a third-party Java Collections library (Eclipse Collections) Java 9–compatible.

You will get an overview of all the steps taken and the evolution of the final, Java 9–compatible product. These steps are essentially similar to those you might have to take to upgrade your application to use JDK 9.

The session covers available tooling and simple yet practical tips and tricks that will help you in the upgrade process.

##**Collections.compare: JDK, Eclipse, Guava, Apache...**

Collections are a staple in any programming language: the need to collect, sort, or iterate over values is needed by nearly all developers. The Java language introduced the Collections framework long ago. It has plenty to offer, but many find it lacking: the number of collection libraries as active open source projects demonstrates the need for something else.

This session does a holistic comparison of the most-common collections (pun intended!) frameworks, what they have to offer, and what you should consider for your next project. It also shows common programmer use cases; how each library handles them; and the impact on memory, processing power, and ease of use/coding.

Come and let us help you choose the right bag for your tricks!

.

##**REGISTRATION NOTES**

The Dublin Java User Group meetups are designed to enhance the knowledge of developers and technology professionals.

Due to the overwhelming demand to attend our events they are always full. On occasion, a small attendance fee may be required.

The organisers reserve the right to cancel the booking if the attendee is not aligned to the intended audience.

# **The Dublin Java User Group - Sponsor Messages**

**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?**](https://recruit.zoho.com/recruit/ViewJob.na?digest=7NZDPrAwelZRR7pgbV1JQlg7fAI9NqhUofQ6ctM2P.8-&embedsource=Embed)

Website: [**Stackand.Co**](http://stackand.co) / Twitter: [**StackanddotCo**](https://twitter.com/stackanddotco)

.

**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**](https://equifax.com) / Twitter: [**Equifax**](https://twitter.com/equifax)

.

**GuruTeam's** 'crème de la crème' instructors deliver an enthusing and valuable learning experience, equipping attendees with the vital skills applicable to their careers, and bringing true business value to organisations they work with.

Upcoming courses include CI with Jenkins, Apache Hadoop, Data Science & Big Data Analytics, Spring, GIT, Linux Foundation™, Angular 2, and OpenStack™

Website: [**GuruTeamIrl.com**](http://guruteamirl.com) / Twitter: [**GuruTeamIreland**](https://twitter.com/guruteamireland)

.

**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.”

Website: [**Version1.com**](https://version1.com) / Twitter: [**Version1Tweets**](https://twitter.com/Version1Tweets)

.

**Teckro** are rethinking every element of clinical research - the people, the processes, the technologies used. By making it possible for all relevant information to be instantly accessible to every active member of a clinical trial and for the entire study teams to be connected effortlessly, they are broadening the possibilities of what can be achieved. This means drugs and treatments for the world’s most complex diseases are being developed quicker, and Teckro's long-term goal of continuously improving healthcare for everyone is realised.

Teckro's partnership with DubJUG means that they can interact and exchange ideas with some of Dublin’s best developers.

Website: [**Teckro.com**](http://Teckro.com) / Twitter: [**TeckroOfficial**](https://twitter.com/teckroofficial?lang=en)

.

**Sonorplex** add the edge to event attendance with their innovative 'Mark and Review' video platform. Download the Sonorplex app on your smartphone, attend DubJUG, and click points of interest in realtime. Your own personal 'marked' copy will be available for reviewing within hours, allowing you to relive the presentations again and again!

Website: [**Sonorplex.com**](https://sonorplex.com) / Twitter: [**Sonorplex**](https://twitter.com/sonorplex)

.

**tcube** provides city-centre co-working / hotdesks and fully serviced office space for ICT professionals and companies specifically. Their community knits so well together remote workers, contractors, city visitors and entrepreneurs / startups immediately become a part of a network of like-minded people who are able and willing to help one another. Offices in Fleet Street, Trinity Street and Grafton Street provide great locations with a huge benefit when it comes to hiring and retaining millennials.

Website: [**tcubedublin.com**](https://tcubedublin.com) / Twitter: [**tcubeDublin**](https://twitter.com/tcubedublin)

.

##**MORE DUBLIN JAVA USER GROUP EVENTS**
**Java developers who are interested in this meetup are also attending other Dublin Java User Group meetups - check them at** [**DubJUG.org**](http://dubjug.org)

[**SORRY EVENT FINISHED - CLICK HERE TO VIEW UPCOMING JAVA EVENTS**](https://ti.to/dublin-java-user-group/)

Our final October meetup was presented by Las Vegas-based Microsoft Developer Advocate Brian Benz, who showed some of the easiest ways for Java developers to deliver their code to the cloud using Linux command line tools.

Brian was a Senior Developer Advocate at Microsoft, helping Java developers get the most out of Azure. Before joining Microsoft, he had been a solution architect, consultant, developer, author, and presenter at IBM, Deloitte, and other companies.

You could follow him on Twitter at @bbenz.

.

##**Top Ways to Deliver Your Java Code to the Cloud**

Brian will highlight the easiest ways for Java developers to deliver their code to the cloud and the best ways to reliably make updates and maintain production cloud code.

The focus will be on real-world examples using Linux command line tools, open source tools such as Jenkins, and other free SDKs and tools available on GitHub.

The examples, tools and demos that he shows will be applicable to any cloud platform, and all are available on GitHub. He will show Microsoft Azure running the samples - this is a technical talk that will focus on the code.

.

##**REGISTRATION NOTES**

The Dublin Java User Group meetups are designed to enhance the knowledge of developers and technology professionals.

To reduce the number of people who do not show up, there is a small attendance cost. But sure, you'll get the value back in knowledge, beer and pizza! We also offer a limited number of free tickets.

Due to the overwhelming demand to attend our events they are always full so make sure you're subscribed to the wait-list to get the release notification.

We reserve the right to cancel bookings if the attendee is not aligned to the intended audience.

**Doors Open 18:15 / Presentations 19:00**

# **The Dublin Java User Group - Sponsor Messages**

**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?**](https://recruit.zoho.com/recruit/ViewJob.na?digest=7NZDPrAwelZRR7pgbV1JQlg7fAI9NqhUofQ6ctM2P.8-&embedsource=Embed)

Website: [**Stackand.Co**](http://stackand.co) / Twitter: [**StackanddotCo**](https://twitter.com/stackanddotco)

.

**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**](https://equifax.com) / Twitter: [**Equifax**](https://twitter.com/equifax)

.

**GuruTeam's** 'crème de la crème' instructors deliver an enthusing and valuable learning experience, equipping attendees with the vital skills applicable to their careers, and bringing true business value to organisations they work with.

Upcoming courses include CI with Jenkins, Apache Hadoop, Data Science & Big Data Analytics, Spring, GIT, Linux Foundation™, Angular 2, and OpenStack™

Website: [**GuruTeamIrl.com**](http://guruteamirl.com) / Twitter: [**GuruTeamIreland**](https://twitter.com/guruteamireland)

.

**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.”

Website: [**Version1.com**](https://version1.com) / Twitter: [**Version1Tweets**](https://twitter.com/Version1Tweets)

.

**Teckro** are rethinking every element of clinical research - the people, the processes, the technologies used. By making it possible for all relevant information to be instantly accessible to every active member of a clinical trial and for the entire study teams to be connected effortlessly, they are broadening the possibilities of what can be achieved. This means drugs and treatments for the world’s most complex diseases are being developed quicker, and Teckro's long-term goal of continuously improving healthcare for everyone is realised.

Teckro's partnership with DubJUG means that they can interact and exchange ideas with some of Dublin’s best developers.

Website: [**Teckro.com**](http://Teckro.com) / Twitter: [**TeckroOfficial**](https://twitter.com/teckroofficial?lang=en)

.

**Sonorplex** add the edge to event attendance with their innovative 'Mark and Review' video platform. Download the Sonorplex app on your smartphone, attend DubJUG, and click points of interest in realtime. Your own personal 'marked' copy will be available for reviewing within hours, allowing you to relive the presentations again and again!

Website: [**Sonorplex.com**](https://sonorplex.com) / Twitter: [**Sonorplex**](https://twitter.com/sonorplex)

.

**tcube** provides city-centre co-working / hotdesks and fully serviced office space for ICT professionals and companies specifically. Their community knits so well together remote workers, contractors, city visitors and entrepreneurs / startups immediately become a part of a network of like-minded people who are able and willing to help one another. Offices in Fleet Street, Trinity Street and Grafton Street provide great locations with a huge benefit when it comes to hiring and retaining millennials.

Website: [**tcubedublin.com**](https://tcubedublin.com) / Twitter: [**tcubeDublin**](https://twitter.com/tcubedublin)

.

##**MORE DUBLIN JAVA USER GROUP EVENTS**
**Java developers who are interested in this meetup are also attending other Dublin Java User Group meetups - check them at** [**DubJUG.org**](http://dubjug.org)

[**SORRY EVENT FINISHED - CLICK HERE TO VIEW UPCOMING JAVA EVENTS**](https://ti.to/dublin-java-user-group/)

Microservices was a hot topic, but how did you migrate from relational monoliths to distributed data? We heard Red Hat’s Edson Yanaga explain how, and also how Google’s Kubernetes was used to wrap and deploy Docker into production.

Edson presented…

# **Migrating to Microservice Databases: From Relational Monolith to Distributed Data**

##and

# **Kubernetes for Java / Docker Developers**

##Doors Open 14:00 (afternoon session) / 18:15 (evening session)

.

This month, for only the second time in our ten year history, we are hosting our meetup on a Sunday. We are incredibly privileged to welcome Edson Yanaga, [Red Hat's Director of Developer Experience.](https://developers.redhat.com)

Edson is a Java Champion and a Microsoft MVP. He is also a published author and a frequent speaker at international conferences, discussing Java, Microservices, Cloud Computing, DevOps, and Software Craftsmanship.

Yanaga considers himself a software craftsman and is convinced that we all can create a better world for people with better software. His life's purpose is to deliver and help developers worldwide to deliver better software faster and safely - and he can even call that a job!

You can follow him on twitter at [**@yanaga**](https://twitter.com/@yanaga)

.

##**Migrating to Microservice Databases: From Relational Monolith to Distributed Data**

In a distributed system with multiple moving parts, which is the case of Microservices, we can’t allow that a single complement downtime breaks down the entire system. Dealing with stateless code is easy, but it gets much harder when we have to deal with persistent state. In this scenario, zero downtime migrations are paramount to guarantee integrity and consistency.

Within all the Microservices characteristics, undoubtedly the one that creates more perplexity is the “one database per Microservice”. However, very few teams have the privilege of starting something from scratch: most of the times they have a legacy database that will survive any new implementation.

In legacy systems you traditionally have a model that adopts transactions, strong consistency, and CRUD. In order to guarantee integrity and consistency with zero downtime, we must reassess some of these concepts. In this talk we’ll discuss strong and eventual consistency, CRUD and CQRS, Event Sourcing, and how these techniques relate to each other in many different integration and evolution strategies for relational databases. We’ll explore Views, Materialized Views, Mirror Tables, Event Sourcing/Streaming, Data Virtualization, Change Data Capture, and how these strategies enable you to build up a Microservices architecture from a legacy monolithic relational database.

[Download Edson's recently released O'Reilly book](https://developers.redhat.com/promotions/migrating-to-microservice-databases/)

##**Kubernetes for Java / Docker Developers**

Yes, Docker is great! We are all very aware of that but now it’s time to take the next step: wrapping it all and deploying to a production environment. For this scenario, we need something more. For that “more” we have Kubernetes by Google - a container platform based on the same technology used to deploy billions of containers per month on Google’s infrastructure.

Ready to leverage your Docker skills and package your current Java app (WAR, EAR or JAR)? Come to this session to see how your current Docker skillset can be easily mapped to Kubernetes concepts and commands. And get ready to deploy your containers in production!

.

##**REGISTRATION NOTES**

The Dublin Java User Group meetups are designed to enhance the knowledge of developers and technology professionals.

Due to the overwhelming demand to attend our events they are always full. Tickets are mostly free, although, on occasion, a refundable attendance fee is required.

The organisers reserve the right to cancel the booking if the attendee is not aligned to the intended audience.

# **The Dublin Java User Group - Sponsor Messages**

**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?**](https://recruit.zoho.com/recruit/ViewJob.na?digest=7NZDPrAwelZRR7pgbV1JQlg7fAI9NqhUofQ6ctM2P.8-&embedsource=Embed)

Website: [**Stackand.Co**](http://stackand.co) / Twitter: [**StackanddotCo**](https://twitter.com/stackanddotco)

.

**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**](https://equifax.com) / Twitter: [**Equifax**](https://twitter.com/equifax)

.

**GuruTeam's** 'crème de la crème' instructors deliver an enthusing and valuable learning experience, equipping attendees with the vital skills applicable to their careers, and bringing true business value to organisations they work with.

Upcoming courses include CI with Jenkins, Apache Hadoop, Data Science & Big Data Analytics, Spring, GIT, Linux Foundation™, Angular 2, and OpenStack™

Website: [**GuruTeamIrl.com**](http://guruteamirl.com) / Twitter: [**GuruTeamIreland**](https://twitter.com/guruteamireland)

.

**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.”

Website: [**Version1.com**](https://version1.com) / Twitter: [**Version1Tweets**](https://twitter.com/Version1Tweets)

.

**Teckro** are rethinking every element of clinical research - the people, the processes, the technologies used. By making it possible for all relevant information to be instantly accessible to every active member of a clinical trial and for the entire study teams to be connected effortlessly, they are broadening the possibilities of what can be achieved. This means drugs and treatments for the world’s most complex diseases are being developed quicker, and Teckro's long-term goal of continuously improving healthcare for everyone is realised.

Teckro's partnership with DubJUG means that they can interact and exchange ideas with some of Dublin’s best developers.

Website: [**Teckro.com**](http://Teckro.com) / Twitter: [**TeckroOfficial**](https://twitter.com/teckroofficial?lang=en)

.

**Sonorplex** add the edge to event attendance with their innovative 'Mark and Review' video platform. Download the Sonorplex app on your smartphone, attend DubJUG, and click points of interest in realtime. Your own personal 'marked' copy will be available for reviewing within hours, allowing you to relive the presentations again and again!

Website: [**Sonorplex.com**](https://sonorplex.com) / Twitter: [**Sonorplex**](https://twitter.com/sonorplex)

.

**tcube** provides city-centre co-working / hotdesks and fully serviced office space for ICT professionals and companies specifically. Their community knits so well together remote workers, contractors, city visitors and entrepreneurs / startups immediately become a part of a network of like-minded people who are able and willing to help one another. Offices in Fleet Street, Trinity Street and Grafton Street provide great locations with a huge benefit when it comes to hiring and retaining millennials.

Website: [**tcubedublin.com**](https://tcubedublin.com) / Twitter: [**tcubeDublin**](https://twitter.com/tcubedublin)

.

##**MORE DUBLIN JAVA USER GROUP EVENTS**
**Java developers who are interested in this meetup are also attending other Dublin Java User Group meetups - check them at** [**DubJUG.org**](http://dubjug.org)

[**SORRY EVENT FINISHED - CLICK HERE TO VIEW UPCOMING JAVA EVENTS**](https://ti.to/dublin-java-user-group/)

“We were incredibly privileged to welcome back Tim Berglund, Director of Developer Experience at Confluent, the company that brings you the distributed messaging system and streaming data platform, Apache Kafka.

Tim presented…


#**Apache Kafka: A Streaming Data Platform**

##and

# **Heraclitus, the Metaphysics of Change, and Streaming Data**

##Doors Open 18:15 / Doors Close and Presentation Begins 19:00

Tim can frequently be found at speaking at conferences in the United States and all over the world. He is the co-presenter of various O’Reilly training videos on topics ranging from Git to Distributed Systems, and is the author of Gradle Beyond the Basics. He is also the co-host of the http://devrelrad.io podcast, and lives in Littleton, CO, USA with the wife of his youth and their youngest child; the other two having mostly grown up.

You can follow him on twitter at [**@tlberglund**](https://twitter.com/tlberglund).
.

##**Apache Kafka: A Streaming Data Platform**

When it comes time to choose a distributed messaging system, everyone knows the answer: Apache Kafka. But how about when you’re on the hook to choose a world-class, horizontally scalable stream data processing system? When you need not just publish and subscribe messaging, but also long-term storage, a flexible integration framework, and a means of deploying real-time stream processing applications at scale without having to integrate a number of different pieces of infrastructure yourself? The answer is still Apache Kafka.

In this talk, we’ll make a rapid-fire review of the breadth of Kafka as a streaming data platform. We’ll look at its internal architecture, including how it partitions messaging workloads in a fault-tolerant way. We’ll learn how it provides message durability. We’ll look at its approach to pub/sub messaging. We’ll even take a peek at how Kafka Connect provides code-free, scalable, fault-tolerant integration, and how the Streams API provides a complete framework for computation over all the streaming data in your cluster
.
.

**STOP PRESS.....** [**Check out the new Dublin Java User Group Website**](http://dubjug.org)
.

##**Heraclitus, the Metaphysics of Change, and Streaming Data**

Hailing from the Persian city of Ephesus in around 500 BC, the Greek philosopher Heraclitus is famous for his trenchant analysis of stream processing systems, saying “You never step into the same river twice.” Central to his philosophy was the idea that all things change constantly. His close readers also know him as the Weeping Philosopher—perhaps because dealing with constantly changing data at low latency is actually pretty hard. It doesn’t need to be that way.

Almost as famous as Heraclitus is Apache Kafka, the de facto standard open-source distributed stream processing system. Many of us know Kafka’s architectural and pub/sub API particulars as well as we know the philosophy of Heraclitus, but that doesn’t mean we’re equipped to build the kind of real-time streaming data systems that the next generation of business requirements are doing to demand. Like Heraclitus was telling us 2,500 years ago: we need to get on board with streams.

This talk is a thorough introduction to the Streams API, an important recent addition to Kafka that lets us build sophisticated stream processing systems that are as scalable and fault-tolerant as Kafka itself, and also happen to align quite well with the microservices sensibilities that are so common in contemporary architectural thinking. We’ll talk about how to deploy Streams applications and look at actual working code that will bring your thinking about streaming data systems from the ancient history of pub/sub paradigms into the current era.

.

# **The Dublin Java User Group - Sponsor Messages**

**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?**](https://recruit.zoho.com/recruit/ViewJob.na?digest=7NZDPrAwelZRR7pgbV1JQlg7fAI9NqhUofQ6ctM2P.8-&embedsource=Embed)

Website: [**Stackand.Co**](http://stackand.co) / Twitter: [**@StackanddotCo**](https://twitter.com/stackanddotco)

.

**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**](https://equifax.com) / Twitter: [**@Equifax**](https://twitter.com/equifax)

.

**GuruTeam's** 'crème de la crème' instructors deliver an enthusing and valuable learning experience, equipping attendees with the vital skills applicable to their careers, and bringing true business value to organisations they work with.

Upcoming courses include CI with Jenkins, Apache Hadoop, Data Science & Big Data Analytics, Spring, GIT, Linux Foundation™, Angular 2, and OpenStack™

Website: [**GuruTeamIrl.com**](http://guruteamirl.com) / Twitter: [**@GuruTeamIreland**](https://twitter.com/guruteamireland)

.

**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.”

Website: [**Version1.com**](https://version1.com) / Twitter: [**@Version1Tweets**](https://twitter.com/Version1Tweets)

.

**Teckro** are rethinking every element of clinical research - the people, the processes, the technologies used. By making it possible for all relevant information to be instantly accessible to every active member of a clinical trial and for the entire study teams to be connected effortlessly, they are broadening the possibilities of what can be achieved. This means drugs and treatments for the world’s most complex diseases are being developed quicker, and Teckro's long-term goal of continuously improving healthcare for everyone is realised.

Teckro's partnership with DubJUG means that they can interact and exchange ideas with some of Dublin’s best developers.

Website: [**Teckro.com**](http://Teckro.com) / Twitter: [**@TeckroOfficial**](https://twitter.com/teckroofficial?lang=en)

.

**Sonorplex** add the edge to event attendance with their innovative 'Mark and Review' video platform. Download the Sonorplex app on your smartphone, attend DubJUG, and click points of interest in realtime. Your own personal 'marked' copy will be available for reviewing within hours, allowing you to relive the presentations again and again!

Website: [**Sonorplex.com**](https://sonorplex.com) / Twitter: [**@Sonorplex**](https://twitter.com/sonorplex)

.

**tcube** provides city-centre co-working / hotdesks and fully serviced office space for ICT professionals and companies specifically. Their community knits so well together remote workers, contractors, city visitors and entrepreneurs / startups immediately become a part of a network of like-minded people who are able and willing to help one another. Offices in Fleet Street, Trinity Street and Grafton Street provide great locations with a huge benefit when it comes to hiring and retaining millennials.

Website: [**tcubedublin.com**](https://tcubedublin.com) / Twitter: [**@tcubeDublin**](https://twitter.com/tcubedublin)

.
##**BOOKING NOTES**

The Dublin Java User Group meetups are designed for the benefit of developers and technology professionals to enhance knowledge. The organisers reserve the right to cancel the booking if the attendee is not aligned to the intended audience.

Due to the overwhelming demand to attend our events they are always full. Tickets are mostly free, although, on occasion, a refundable attendance fee is required.

The attendance fee you pay today will be refunded, in whole, providing you attend the event at the allocated time. If you do not attend the event for whatever reason or are ineligible to attend, the fee you have paid will be allocated to the running of future Dublin Java User Group events. Tickets are non-transferable.

##**MORE JAVA EVENTS**
**Java developers who are interested in this meetup are also attending other Dublin Java User Group meetups - check them at** [**DubJUG.org**](http://dubjug.org)

On the 10th September 2017, we were incredibly privileged to welcome Dr Venkat Subramaniam to DubJUG. It was the first time in our ten-year history that we hosted our meetup on a Sunday.

Venkat was an award-winning author, founder of Agile Developer, Inc., creator of agilelearner.com, and an instructional professor at the University of Houston.

He had trained and mentored thousands of software developers in the US, Canada, Europe, and Asia (and finally Ireland!), and was a regularly-invited speaker at several international conferences. Venkat helped his clients effectively apply and succeed with sustainable agile practices on their software projects.

Venkat was (co)author of multiple technical books, including the 2007 Jolt Productivity award-winning book *Practices of an Agile Developer*. A list of his books was available at agiledeveloper.com.

You could follow him on Twitter at @venkat\_s.

.

##**Twelve Ways to Make Code Suck Less**

We all have seen our share of bad code and some really good code as well. What are some of the common anti patterns that seem to be recurring over and over in code that sucks? By learning about these code smells and avoiding them, we can greatly help make our code better. Come to this talk to learn about some common code smell and how to improve the quality of code.
.

##**Designing Functional Programs**

Functional Programming promotes immutability and the use of higher order functions. For those of us who have designed and architected applications using an imperative style of programming and the object-oriented paradigm, this largely appears like a strange idea. We often ask, how is it practical to apply these ideas, realistically to build practical applications. It turns out it's highly practical but we have to change how we design and how we model our systems. Come to this presentation to think about functional style and how to start viewing design to make better use of this way of programming.
.

##**REGISTRATION NOTES**

The Dublin Java User Group meetups are designed to enhance the technical knowledge of attendees, and due to the overwhelming demand to attend our events they are always full.

The organizers and the speaker are giving their time for this event to share knowledge with you at the Dublin Java User Group community, freely. The booking fee you pay today will be refunded, in whole, providing you attend the event at the allocated time. If you do not attend the event for whatever reason, the fee you have paid will instead be allocated to the running of Dublin Java User Group events. The Dublin Java User Group events are for developers only. Tickets are non-transferable."

# **The Dublin Java User Group - Sponsor Messages**

**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?**](https://recruit.zoho.com/recruit/ViewJob.na?digest=7NZDPrAwelZRR7pgbV1JQlg7fAI9NqhUofQ6ctM2P.8-&embedsource=Embed)

Website: [**Stackand.Co**](http://stackand.co) / Twitter: [**StackanddotCo**](https://twitter.com/stackanddotco)

.

**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**](https://equifax.com) / Twitter: [**Equifax**](https://twitter.com/equifax)

.

**GuruTeam's** 'crème de la crème' instructors deliver an enthusing and valuable learning experience, equipping attendees with the vital skills applicable to their careers, and bringing true business value to organisations they work with.

Upcoming courses include CI with Jenkins, Apache Hadoop, Data Science & Big Data Analytics, Spring, GIT, Linux Foundation™, Angular 2, and OpenStack™

Website: [**GuruTeamIrl.com**](http://guruteamirl.com) / Twitter: [**GuruTeamIreland**](https://twitter.com/guruteamireland)

.

**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.”

Website: [**Version1.com**](https://version1.com) / Twitter: [**Version1Tweets**](https://twitter.com/Version1Tweets)

.

**Teckro** are rethinking every element of clinical research - the people, the processes, the technologies used. By making it possible for all relevant information to be instantly accessible to every active member of a clinical trial and for the entire study teams to be connected effortlessly, they are broadening the possibilities of what can be achieved. This means drugs and treatments for the world’s most complex diseases are being developed quicker, and Teckro's long-term goal of continuously improving healthcare for everyone is realised.

Teckro's partnership with DubJUG means that they can interact and exchange ideas with some of Dublin’s best developers.

Website: [**Teckro.com**](http://Teckro.com) / Twitter: [**TeckroOfficial**](https://twitter.com/teckroofficial?lang=en)

.

**Sonorplex** add the edge to event attendance with their innovative 'Mark and Review' video platform. Download the Sonorplex app on your smartphone, attend DubJUG, and click points of interest in realtime. Your own personal 'marked' copy will be available for reviewing within hours, allowing you to relive the presentations again and again!

Website: [**Sonorplex.com**](https://sonorplex.com) / Twitter: [**Sonorplex**](https://twitter.com/sonorplex)

.

**tcube** provides city-centre co-working / hotdesks and fully serviced office space for ICT professionals and companies specifically. Their community knits so well together remote workers, contractors, city visitors and entrepreneurs / startups immediately become a part of a network of like-minded people who are able and willing to help one another. Offices in Fleet Street, Trinity Street and Grafton Street provide great locations with a huge benefit when it comes to hiring and retaining millennials.

[**SORRY EVENT FINISHED - CLICK HERE TO VIEW UPCOMING JAVA EVENTS**](https://ti.to/dublin-java-user-group/)

Ahead of the long-awaited release of Java EE 8, Oracle Belgium’s Server-Side Software Evangelist David Delabassée visited Dublin to explain the features that would be released. It was a great opportunity for our members to ask questions at the coal face.

## **About David**

David Delabassée is a Software Evangelist working for Oracle; his focus is Server-side Java including Java EE (Java Enterprise Edition). Prior to Oracle, David spent a decade at Sun Microsystems focusing on Java end-to-end, i.e. from the smart card to the high end servers. In his various roles, David has been involved in numerous Java projects since the early days of this technology.

David lives in Belgium. In his spare time, he enjoys playing video games with his daughter and tinkering with technologies such as Home Automation, 3D printers, electronics and pinballs.

[**David Delabassee Linkedin**](https://www.linkedin.com/in/daviddelabassee/)

[**David Delabassee on Twitter**](https://twitter.com/delabassee/)

## **Java EE 8 – A Drill Down**

Quite a few things have changed since the original Java EE 8 proposal. In this session David discussed what Java EE 8 will be about.

He covered in detail the new capabilities that are slated for inclusion in the Java EE platform, such as

* JAX-RS 2.1’s new Reactive client API
* Servlet 4.0 HTTP/2 support
* CDI 2.0 Asynchronous events
* Various Bean Validation 2.0’s improvements
* A new JSON Binding API and a new Security API, etc.

# **The Dublin Java User Group - Sponsor Messages**

**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?**](https://recruit.zoho.com/recruit/ViewJob.na?digest=7NZDPrAwelZRR7pgbV1JQlg7fAI9NqhUofQ6ctM2P.8-&embedsource=Embed)

Website: [**Stackand.Co**](http://stackand.co)

.

**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**](https://equifax.com)

.

**GuruTeam's** 'crème de la crème' instructors deliver an enthusing and valuable learning experience, equipping attendees with the vital skills applicable to their careers, and bringing true business value to organisations they work with.

Some places are subsidised by Skillnets. [**Check out upcoming course details here**](http://www.guruteamirl.com/?post_type=tribe_events)

.

**Version 1** Announcing Soon.

Website: [**Version1.com**](https://version1.com)

.

**Sonorplex** add the edge to event attendance with their innovative 'Mark and Review' video platform. Download the Sonorplex app on your smartphone, attend DubJUG, and click points of interest in realtime. Your own personal 'marked' copy will be available for reviewing within hours, allowing you to relive the presentations again and again!

Website: [**Sonorplex.com**](https://sonorplex.com)

.

**tcube** provides city-centre co-working / hotdesks and fully serviced office space for ICT professionals and companies specifically. Their community knits so well together remote workers, contractors, city visitors and entrepreneurs / startups immediately become a part of a network of like-minded people who are able and willing to help one another. Offices in Fleet Street, Trinity Street and Grafton Street provide great locations with a huge benefit when it comes to hiring and retaining millennials.

Website: [**tcubedublin.com**](https://tcubedublin.com)

##**MORE DUBLIN JAVA USER GROUP EVENTS**
**Our members also attended many more Dublin Java User Group meetups** - [**DETAILS HERE**](http://dubjug)

[**SORRY EVENT FINISHED - CLICK HERE TO VIEW UPCOMING JAVA EVENTS**](https://ti.to/dublin-java-user-group/)

**In July 2017, we were delighted to welcome London-based Java Rockstar and Java Champion, Ben Evans, to Ireland to share his deep knowledge of Java 9. In his talk, *State of Play for Java 9*, Ben addressed an audience of 40 local developers and generously gave away licences for jClarity’s Illuminate.**

**Ben is an author, speaker, consultant, and educator. He is a Java Champion, JavaOne Rockstar speaker, and Java Editor at InfoQ. Ben also represents the user community as a voting member on the Java Community Process Executive Committee.**


**More About Ben**
Ben is the author of 'The Well-Grounded Java Developer', 'Java: The Legend', the new edition of 'Java in a Nutshell' and the forthcoming 'Optimizing Java'. He is a regular speaker and educator on topics such as the Java platform, systems architecture, security, performance and concurrency at companies and conferences all over the world.

His career highlights to date include Chief Architect for Listed Derivatives at DB, performance testing the Google IPO, building award-winning websites for some of Hollywood’s biggest hits of the 90s, building multi-billion dollar low-latency trading systems and designing technology to help some of the UK’s most vulnerable people.

[**Ben Evans Linkedin**](https://www.linkedin.com/in/benevans2/)

[**kittylyst on Twitter**](https://twitter.com/kittylyst/)

##An Update on the State of Play for Java 9

The upcoming version of Java (Java 9) is in the tech press headlines at the moment, as the flagship feature has caused unprecedented controversy within the Java Community Process (the body that approves new Java standards). In this talk, Ben Evans (JCP Executive Committee member & Java Champion) will explain what the fuss is all about, how Java 9 compares to previous versions and explore some of the long-term roadmap for Java as well as how previous versions have evolved to lead us to this point, and discuss what it all means for the working Java programmer and the future of the ecosystem.

##Raffle - two licences for jClarity's Illuminate

On the night, Ben raffled off a couple of free annual licenses of Illuminate (worth $1428 per annum each) to people at our meetup! Illuminate is jClarity's Machine Learning driven Java / JVM application performance analyser (phew wordage!) that organisations like Kayak, Goldman Sachs and Intel are using to save themselves a massive amount of time and money when it comes to solving performance issues.

The lucky winners also received backing from jClarity's engineering team as their performance tuning mentors :-).

[**Click here to learn about and get your trial copy of Illuminate**](https://hopper.jclarity.com/product/illuminate-free-trial/)

# **The Dublin Java User Group - Sponsor Messages**

**GuruTeam's** 'crème de la crème' instructors deliver an enthusing and valuable learning experience, equipping attendees with the vital skills applicable to their careers, and bringing true business value to organisations they work with.

**Whilst here in Dublin, Ben is presenting his newly launched Optimising Java course on 6th and 7th July in Dublin, and you and your colleague can attend this two-day course for a heavily subsidised price of just €500 each.**

[**View Course Description HERE**](https://guruteam.clearbookings.com/index.php?option=com_jbooka&view=listing&lid=125871/)

(Extra dates scheduled in Belfast, Cork and Galway)

.

**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?**](https://recruit.zoho.com/recruit/ViewJob.na?digest=7NZDPrAwelZRR7pgbV1JQlg7fAI9NqhUofQ6ctM2P.8-&embedsource=Embed)

Website: [**Stackand.Co**](http://stackand.co)

.

**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**](https://equifax.com)

.

**Sonorplex** add the edge to event attendance with their innovative 'Mark and Review' video platform. Download the Sonorplex app on your smartphone, attend DubJUG, and click points of interest in realtime. Your own personal 'marked' copy will be available for reviewing within hours, allowing you to relive the presentations again and again!

Website: [**Sonorplex.com**](https://sonorplex.com)

.

**tcube** provides city-centre co-working / hotdesks and fully serviced office space for ICT professionals and companies specifically. Their community knits so well together remote workers, contractors, city visitors and entrepreneurs / startups immediately become a part of a network of like-minded people who are able and willing to help one another. Offices in Fleet Street, Trinity Street and Grafton Street provide great locations with a huge benefit when it comes to hiring and retaining millennials.

Website: [**tcubedublin.com**](https://tcubedublin.com)

##**MORE JAVA EVENTS**
**Java developers who came to this meetup also attended Dublin Java User Group's July meetup with Oracles's Server Side Software Evangelist David Delabassee** - [**DETAILS HERE**](https://ti.to/dublin-java-user-group/Java-8EE-drill-down-oracle-david-delabassee)

[**SORRY EVENT FINISHED - CLICK HERE TO VIEW UPCOMING JAVA EVENTS**](https://ti.to/dublin-java-user-group/)