Talk 1: Proxy Power: Boosting Java App Performance with Open JDBC Proxy

Rogerio Robetti will explore the crucial role that database proxies play in building robust, high-performance Java applications. He will introduce OJP (Open JDBC Proxy), an open-source tool designed to simplify and optimize database connectivity, especially under heavy load.

The talk will cover why using a proxy can make a real difference in resource management, stability, and scalability. Rogerio will share detailed performance testing results comparing OJP with direct JDBC connections to highlight its impact on throughput and efficiency.

To wrap up, he will demonstrate OJP in action with a live demo, showing how easy it is to integrate and the benefits it brings to real-world workloads.

Discover More: https://github.com/open-jdbc-proxy/ojp .

About Rogerio Robetti

Rogerio Robetti is a Lead Software Engineer with over 17 years of experience building and leading engineering teams in the financial and technology sectors.

Based in Dublin, he has contributed to the success of organizations like Mastercard, Bank of America, Huawei, and more recently, Bank of Ireland. A published author, holding several industry certifications, and passionate about mentoring and innovation, Rogerio is a recognized advocate for modern software architecture and best practices in Java development.

This year, 2025, Rogerio started OJP – the Open JDBC Proxy, an open-source project aimed at simplifying and enhancing JDBC data source interactions for Java developers.

Find him on Linkedin .

Talk 2: Getting Started with Jakarta EE 11 and What’s New in Jakarta EE 12

Jakarta EE 11, released in June 2025, focused on productivity and innovation, delivered: updates to 16 specifications; a new specification, Jakarta Data; and sets the baseline to Java 21, the latest LTS release.

With a planned release of July 2026, work has already started with Jakarta EE 12. As of early May 2025, there are 24 specifications in which their respective reviews have passed. There are three new specifications for consideration in Jakarta EE 12: Jakarta Query, Jakarta Portlet and Jakarta Portlet Bridge.

In his presentation, Mike Redlich, Java Champion and leader of the Garden State JUG, will help get you started using Jakarta EE 11 with working examples along with a sneak peek at what you can expect in Jakarta EE 12.

About Mike Redlich

Michael Redlich has been an active member within the Java community for the past 25 years. He founded the Garden State Java User Group (formerly the ACGNJ Java Users Group) in 2001 where he serves as one of the directors. Since 2016, Mike has served as a Java community news editor for InfoQ where his contributions include the weekly Java news roundup, news items, technical articles and technical reviews from external authors. He is currently the lead Java Queue editor. 

He is the author of "Helidon Revealed: A Practical Guide to Oracle’s Microservices Framework," scheduled to be released in late-December 2024.

Mike has presented at venues such as Devnexus, Oracle Code One, JCON World, Emerging Technologies for the Enterprise, Trenton Computer Festival (TCF), TCF IT Professional Conference, and numerous Java User Groups. Mike serves as a committer on the Jakarta NoSQL and Jakarta Data specifications and the Eclipse JNoSQL project. He also participates on the leadership council of the Jakarta EE Ambassadors. Mike was named a Java Champion in April 2023.

He retired from ExxonMobil Technology & Engineering in June 2023 with 33½ years of service. His experience included developing custom scientific laboratory and web applications, polymer physics, chemometrics, infrared spectroscopy and automotive testing. He also has experience as a Technical Support Engineer at Ai-Logix, Inc. (now AudioCodes) where he provided technical support and developed telephony applications for customers.

Mike currently works at Payara as a contract Developer Advocate and Technical Writer.

About the Dublin Java User Group

Since 2006, the Dublin Java User Group, aka DubJUG, has been working with the global Java community to amplify technical knowledge for the benefit of Irish based developers and businesses. It is a resident member of Dublin's TechMeetup.space. 

Discover more: Website / LinkedIn

DubJUG, supported by our Partners

Squarespace, the design-driven platform that helps entrepreneurs build their brands and businesses online. Squarespace empowers millions of customers in more than 200 countries and territories with all the tools needed to create an online presence, build an audience, monetize, and scale their business. The Squarespace suite of products range from websites, domains, ecommerce, and marketing tools, as well as tools for scheduling with Acuity, and creating and managing social media presence with Unfold.

Their team of more than 1,700 professionals is headquartered in bustling New York City, with offices in Dublin, Ireland and Aveiro, Portugal, and coworking spaces in the UK, Netherlands, and Australia.

Discover more: Website / LinkedIn

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Integral Ad Science is a leading global media measurement and optimization platform that delivers the industry’s most actionable data to drive superior results for the world’s largest advertisers, publishers, and media platforms. IAS’s software provides comprehensive and enriched data that ensures ads are seen by real people in safe and suitable environments while improving return on ad spend for advertisers and yield for publishers. Our mission is to be the global benchmark for trust and transparency in digital media quality.

Discover more: Website / LinkedIn

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Stackand.Co enrich the professional lives of Java software professionals - with over 20 years experience in the Irish tech recruitment market, they have helped many great people elevate their careers, and many great companies build their teams. 

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

Discover more: Website / LinkedIn

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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.

Discover more: Website / LinkedIn

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FINEOS is a leading provider of core systems for life, accident and health insurers globally with 7 of the 10 largest group life and health carriers in the US as well as 6 of the largest life insurers in Australia. With employees and offices throughout the world, FINEOS continues to scale rapidly, working with innovative progressive insurers in North America, Europe, and Asia Pacific.

Discover more: Website / LinkedIn

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tcube is a low-cost no frills workspace provider located at O'Connell Bridge in Dublin city centre. They provide hot-desks, dedicated co-working desks, office-for-a-day, meeting rooms, and event space.

Discover more: Website / LinkedIn

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