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The podcast of foojay.io, a central resource for the Java community’s daily ​information needs, a place for friends of OpenJDK, ​and a community platform for the Java ecosystem​ — bringing together and helping Java professionals everywhere.

  1. From Code to Stage: Organizing Conferences and Finding Your Voice as a Speaker (#88)

    27/12/2025

    From Code to Stage: Organizing Conferences and Finding Your Voice as a Speaker (#88)

    What turns a nervous first-timer into a confident conference speaker? Let's find out. This the last Foojay Podcast of 2025 and also the last one with interviews recorded at the Devoxx and JFall conferences. Maybe you're already thinking about your goals for 2026: organizing a meetup, submitting your first conference talk, or taking a bigger role in the Java community. If that sounds like you, this episode is for you. I talked with the people behind these conferences and developers at different stages of their speaking journey. At Devoxx, I spoke with Stephan Janssen, who has been organizing Devoxx for 20 years, Susanne Pieterse, about what makes conferences valuable for learning, and Daniël Floor, a developer just starting out with public speaking. At JFall, I caught up with organizers Martin Smelt and Brian Vermeer, Berwout de Vries Robles, who coaches new speakers, and Annelore Egger about her journey from developer to conference speaker. You'll hear practical advice about what makes a good CFP, why conference organizers actively want new speakers, and how the Java community is set up to help you get started. Whether you're thinking about submitting your first talk or curious about what goes into organizing a conference, there's something here for you. 00:00 Introduction of topic and guests 01:33 Stephan Janssen https://www.linkedin.com/in/stephanjanssen/ Devoxx Organizer07:03 Martin Smelt https://www.linkedin.com/in/martin-paul-smelt-8b699a8/JFall Organizer 13:27 Brian Vermeer https://www.linkedin.com/in/brianvermeer/JFall Organizer and speakerTips for speakers, writing a CFPJoin a JUG! 21:02 Annelore Egger https://www.linkedin.com/in/anneloredev/How to become a speaker27:43 Daniël Floor https://www.linkedin.com/in/dani%C3%ABl-floor-266652208/Taking the first steps into public speakingFinding your speaking topic31:28 Berwout de Vries Robles https://www.linkedin.com/in/berwout-de-vries-robles/Tips for speakersPropose a talk to speak at a JUG37:08 Susanne Pieterse https://www.linkedin.com/in/susannepieterse/Learning at conferences, RAG, and other topicsMeeting and talking to the presenters and specialists at a conferenceCO-organizer of ML Con and DevOpsCon in Amsterdamhttps://mlconference.ai/https://devopscon.io/amsterdam/41:20 Conclusion

    42 min
  2. The Human Side of Development: Career Growth, Staying Healthy, and Why People Matter More Than AI (#87)

    20/12/2025

    The Human Side of Development: Career Growth, Staying Healthy, and Why People Matter More Than AI (#87)

    What if work-life balance is a myth, and the real secret is just... life? In this Foojay Podcast we're stepping away from pure code and diving into something equally important: how we live our lives as developers. Because let's be honest, being a great programmer isn't just about mastering Java or the latest framework. It's about managing your career, your health, your family, and finding purpose in all of it. Four incredible guests are all tackling different pieces of this puzzle. First up, Bruno Souza, the Brazilian Java Man, is back to challenge our thinking about work-life balance and share his philosophy on taking control of your career. Then Patricia Lenten talks about the real challenges of hacking parenting while being an engineer, and how we can inspire the next generation of developers. Georgios Diamantopoulos brings the hard data on why sitting is literally killing us and what we can actually do about it. And finally, April Schuppel shares lessons from Apryse's journey through 15 acquisitions in five years—and why people, not AI, are still the most important part of building great products. 00:00 Introduction of topic and guests 01:20 Bruno Souza https://www.linkedin.com/in/brjavaman/Grow your career podcast: https://foojay.io/today/foojay-podcast-72/Bruno's YouTube channel: https://www.youtube.com/@brjavamanWork-life balance doesn't exist, we only have life12:52 Patricia Lenten https://www.linkedin.com/in/patricialenten/Hacking your parentingTechnology is fun18:37 Georgios Diamantopoulos https://www.linkedin.com/in/georgiosd/Staying HealthyThe importance of getting out of your chairhttps://stateofhealth.tech/22:58 April Schuppel https://www.linkedin.com/in/aprilschuppel/Pull, Push, and Merge: Lessons from a Journey of Growth Through AcquisitionsThe people are the most crucial part to build a team, product, and company30:26 Outro

    32 min
  3. Agents, MCP, and Graph Databases: Java Developers Navigate the AI Revolution (#86)

    13/12/2025

    Agents, MCP, and Graph Databases: Java Developers Navigate the AI Revolution (#86)

    The AI revolution isn't replacing Java developers. No, it's forcing us to think harder. Welcome to another episode of the Foojay Podcast! Today, we're talking about AI and Java, how it's changing the way we work, what we need to watch out for, and why understanding what's really happening matters more than ever. I recorded interviews at Devoxx and JFall and spoke with people who build and use this technology every day. Marianne Hoornenborg opened my eyes to something important: every time an AI generates a token, there's a massive amount of computation happening behind the scenes. Viktor Gamov and Baruch Sadogursky did something really cool: they tested six different AI coding tools live on stage with the same task. The results were all over the place! But they found that the tools with access to good documentation performed much better. Stephen Chin showed me how graph databases can make AI responses more reliable by providing a solid source of truth rather than relying on vector search. Mario Fusco works on LangChain4J, a leading Java framework for AI. He explained that breaking down large tasks into smaller ones and using specialized agents can help reduce errors—hallucinations, as they're called. Jeroen Benckhuijsen and Martijn Dashorst shared their experiences working with enterprise Java. Even as frameworks are becoming lighter and we're running everything in containers, there are still complex problems that require real developer expertise. Maarten Mulders reminds us that AI is a tool, not a replacement—especially when you're solving problems no one has tackled before. You still need to know what you're doing. And finally, Simon Maple from Tessel discussed moving beyond vibe coding towards a more reliable, production-ready approach, using specifications to guide AI tools. 00:00 Introduction of topics and guests 02:12 Marianne Hoornenborg https://www.linkedin.com/in/mhoornenborg/The Simple Math behind AI The cost of tokens when using LLMs06:54 Viktor Gamov and Baruch Sadogursky https://www.linkedin.com/in/vikgamov/ https://www.linkedin.com/in/jbaruch/ Robocoders, about the many agentic tools that can be used for vibe coding https://context7.com/16:24 Stephen Chin https://www.linkedin.com/in/steveonjava/ Graph versus relational databases Explaining MCP and Agents23:09 Mario Fusco https://www.linkedin.com/in/mario-fusco-3467213/ AI and LangChain4j in Quarkus Coding tools with AI35:43 Jeroen Benckhuijsen https://www.linkedin.com/in/jeroenbenckhuijsen/ Java in business, Evolutions in Java Making use of containers and Kubernetes Learning from the community41:44 Martijn Dashorst https://www.linkedin.com/in/dashorst/ Investigating an OOM-killer in Kubernetes with the help of AI49:37 Maarten Mulders https://www.linkedin.com/in/mthmulders/How AI may impact our jobs How to improve your Maven builds 56:13 Simon Maple https://www.linkedin.com/in/simonmaple/ AI developer tool Tessl Spec-driven vibe coding Secure AI development01:02:12 Conclusion

    1 h y 4 min
  4. Code, Community, and Opportunity: Making Tech Accessible for Everyone (#85)

    06/12/2025

    Code, Community, and Opportunity: Making Tech Accessible for Everyone (#85)

    Episode 85 of the Foojay Podcast. All info, show notes, and links are available at https://foojay.io/today/category/podcast/. What if the future of Java depends on who we invite to learn it today? In this Foojay Podcast, we're diving into something that affects all of us in the Java community: How can we inspire the next generation of developers, and how do we make the developer world more inclusive? You'll hear four incredible guests who are actively working to make tech more accessible and inclusive. First, Daniel De Luca talks about Devoxx for Kids and how they support underprivileged students in IT education. Then Kenny Schwegler shares his insights on how we can actively promote diversity and inclusion in tech. Cassandra Chin, the youngest Java Champion and author, talks about inspiring young coders through hands-on projects and making technology fun. And finally, Igor De Souza discusses his mission to bring Java into Raspberry Pi education and bring more Java into coding clubs worldwide. These conversations share one message: Talent is everywhere, but opportunity isn't. And we have the power to change that! 01:19 Daniel De Luca https://www.linkedin.com/in/danieldeluca/ Founder Devoxx4Kids Activities of Devoxx4Kids How to inspire children of all ages to get interested in technology14:24 Kenny Schwegler https://www.linkedin.com/in/kenny-baas/ How to build inclusive, diverse teams How the IT industry became male-focused because of IBM marketing Books: https://www.manning.com/books/collaborative-software-design https://learningsystemsthinking.com/26:07 Cassandra Chin https://www.linkedin.com/in/cassandra-chin-developer/ Inspiring children and parents into technology Fun projects to introduce engineering to children Book: https://www.amazon.nl/Raising-Young-Coders-Teaching-Programming/dp/B0DVBQZ483 20% Discount code on the Springer website "APAUT" https://link.springer.com/book/10.1007/979-8-8688-1393-132:45 Igor De Souza https://www.linkedin.com/in/igfasouza/ Java in code clubs like CoderDojo Java in space Collecting Java tutorials and courses for children Java Catalog on Foojay GitHub https://github.com/foojayio/java-education-catalog Pi4J library https://www.pi4j.com/ HelloWorld magazine: https://downloads.ctfassets.net/oshmmv7kdjgm/6jGvFLH86Ems5AJR84Krsk/3888c571ddc1543c9cdb01ce5eff616d/HelloWorld28.pdf55:27 Conclusions

    57 min
  5. Developing Performant, Cost Efficient, and Eco-friendly Code (#84)

    29/11/2025

    Developing Performant, Cost Efficient, and Eco-friendly Code (#84)

    In this Foojay Podcast, we're exploring a critical topic that's becoming increasingly important in our industry: developing sustainable software that is both performant and environmentally friendly. At the Devoxx and JFall conferences, I had fascinating conversations about how we as Java developers can make a real impact on both our cloud costs and our carbon footprint. And it's interesting to learn how these two goals are often perfectly aligned: what's good for your budget is usually good for the planet too. We start with Daniel Witkowski. He published an article on Foojay that takes us on a deep dive into performance tuning. He explains why optimizing your code can have a thousand times more impact than saving 30% on cloud costs, and walks us through his journey of turning a simple integer validation challenge into a masterclass on Java performance optimization. Next, I caught up with Ko Turk, who shares his passion for sustainable engineering and space exploration. He introduces us to Kepler, a tool for monitoring the energy consumption of your applications, and explains how performance optimization naturally leads to sustainability improvements. Then Ronald Dehuysser, founder of JobRunr, reveals how his open-source job-scheduling library now enables carbon-aware job processing. He explains how JobRunr can automatically schedule non-time-critical jobs to run when renewable energy is most available. And finally, Jan Ouwens joins us to discuss practical strategies for reducing both costs and CO2 emissions in your applications. He explains why cloud spending is actually a good proxy for your carbon footprint. 00:00 Introduction of topic and guests 02:07 Daniel Witkowski https://www.linkedin.com/in/danielwitkowskihttps://foojay.io/today/the-art-of-performance-tuning-why-saving-30-in-the-cloud-means-nothing-if-your-code-wastes-1000x-more/https://foojay.io/today/foojay-podcast-83/Why Saving 30% in the Cloud Means Nothing if Your Code Wastes 1000× MorePerformance tuning is less about syntax and more about craftsmanship.29:46 Ko Turk https://www.linkedin.com/in/ko-turk-b271b929/https://github.com/sustainable-computing-io/keplerSustainable engineeringKubernetes Efficient Power Level Exporter (Kepler)32:46 Ronald Dehuysser https://www.linkedin.com/in/ronalddehuysser/https://www.jobrunr.io/en/Carbon-aware job processing with JobRunrGrowing from an open-source project to a company37:36 Jan Ouwens https://www.linkedin.com/in/janouwens/https://jqno.nl/Reducing the cost and CO2-emissions of your applicationPrivate cloud versus cloud providers45:14 Outro

    46 min
  6. OpenJDK Evolutions plus Tips and Tricks (#83)

    22/11/2025

    OpenJDK Evolutions plus Tips and Tricks (#83)

    Welcome to another episode of the Foojay Podcast! Just like in the previous episode, I bring you conversations from two of Europe's premier Java conferences - Devoxx in Belgium and JFall in the Netherlands. At these conferences, I had the opportunity to speak with members of the Java community about topics ranging from the evolution of Java itself to mobile development, performance optimization, and even automotive security. My first guest is Johan Vos, a Java Champion who takes us on a journey through Java's history - from porting Java to Linux in 1995 to his current work on bringing Java and JavaFX to mobile and embedded devices through the Java On Mobile project. Then we'll hear from Stephen Chin, author of "The Definitive Guide to Modern Java Clients with JavaFX," who shares insights on building cross-platform client applications and reflects on how his daughter has followed in his footsteps to become a published author and technology educator. From JFall, Joseph Phillips joins us to discuss Java's evolution, the differences between REST and gRPC, and whether virtual threads have replaced the need for async implementations in modern Java applications. Next, François Martin walks us through the world of Java performance benchmarking with JMH - the Java Microbenchmark Harness - and explains why it's so valuable for comparing different implementations and optimizing code. Wouter De Geus shares his inspiring journey from finance and mathematics into Java development, and how his employer, the Dutch Tax Authority, supports open-source contributions and the Java community. And finally, Roald Nefs demonstrates something truly unique - using Java and the Foreign Function & Memory API to hack into automotive systems, revealing important security considerations for both hardware and software. Content 00:00 Introduction of topics and guests 02:11 Johan Vos https://www.linkedin.com/in/johanvos/History of Java on LinuxHow the Java language and runtime are stable and evolving at the same timeLooking at the future of Write-Once-Run-Everywhere with Java(FX) on Mobilehttps://openjdk-mobile.github.io/19:04 Stephen Chin https://www.linkedin.com/in/steveonjava/Author of "The Definitive Guide to Modern Java Clients with JavaFX"Cassandra Chin: https://www.linkedin.com/in/cassandra-chin-developer/ Her book: https://www.amazon.nl/Raising-Young-Coders-Teaching-Programming/dp/B0DVBQZ48323:22 Joseph Phillips https://foojay.social/deck/@infosec812Java evolutions, communityREST versus gRPCDo we still need async or are virtual threads a better solution?27:49 François Martin https://www.linkedin.com/in/fran%C3%A7oismartinJava performance micro benchmarks with jmhhttps://github.com/openjdk/jmh33:30 Wouter De Geus https://www.linkedin.com/in/wadegeus/Moved from finance to software developmentContributing back to the open-source community39:33 Roald Nefs https://www.linkedin.com/in/roaldnefs/Hacking cars with the FFM APIHardware and software security concernsWhat you can learn from the Java community46:29 Outro

    47 min
  7. OpenJDK Projects (Leyden, Babylon, Panama) and TornadoVM (#82)

    15/11/2025

    OpenJDK Projects (Leyden, Babylon, Panama) and TornadoVM (#82)

    In this Foojay Podcast, we're diving deep into some of the most exciting developments happening within the OpenJDK and TornadoVM projects. At the Devoxx and JFall conferences, we spoke with several speakers and visitors about some of the major themes that are shaping the future of Java development. The first guest is Moritz Halbritter from the Spring Engineering team. He provides us with more insights into Project Leyden and how it's improving Java startup times through ahead-of-time compilation and profiling. We'll learn how Spring Boot developers can already take advantage of these improvements today. Next, we'll hear from John Cecerralli at Azul about performance optimizations, the evolution from x86 to ARM64 architectures, and how OpenJDK Projects bring improvements to the JVM itself at levels we couldn't achieve before. Then, Balkrishna Rawool will guide us through the world of vector databases and explain how Java's Vector API from Project Panama is perfectly positioned for AI use cases, despite its development beginning years before the current AI boom. And finally, we'll meet some of the team members behind TornadoVM - Christos Kotselidis and Michalis Papadimitriou from the University of Manchester - who will explain to us how Java developers can now harness the power of GPUs for AI workloads, running large language models in pure Java without leaving the Java ecosystem. They also explain the connection between TornadoVM and the OpenJDK Project Babylon. 00:00 Introduction of topics and guests 01:58 Moritz Halbritter * https://www.linkedin.com/in/moritz-halbritter-9301a1b1/ * Project Leyden and how it can already be used with Spring * Difference between the approach of Project Leyden and CRaC 11:02 John Cecerralli * https://www.linkedin.com/in/john-ceccarelli-95b7041/ * OpenJDK evolutions in Project Leyden * Startup time improvements in Azul Prime * Java performance * ARM Graviton 17:08 Balkrishna Rawool * https://www.linkedin.com/in/balkrishnarawool/ * Vector API, project Panama 22:44 Christos Kotselidis, Michalis Papadimitriou * https://www.linkedin.com/in/michalis-papadimitriou/ * https://www.linkedin.com/in/kotselidis/ * https://www.tornadovm.org/ * https://www.tornadovm.org/gpullama3 * https://github.com/beehive-lab/TornadoVM * TornadoVM status update, Java on GPU * How TornadoVM relates to Project Babylon and Project Panama 33:42 Outro

    35 min
  8. Maven 4 - The Future of Java Build Automation (#81)

    01/11/2025

    Maven 4 - The Future of Java Build Automation (#81)

    Maven 4 is approaching its release, bringing many improvements to the build tool powering millions of Java projects. In this Foojay Podcast episode, we talk about Apache Maven 4, a significant milestone that has been years in the making. Maven has been the backbone of Java dependency management and build automation since the early 2000s; however, the road to version 4 has been a long and deliberate one. With significant performance improvements, a modernized API for plugin developers, and changes that affect how we think about project structure, Maven 4 represents both an evolution and a revolution. What does this mean for the millions of developers who depend on Maven daily? How should teams prepare for the transition? And what's the story behind the Maven Central Repository changes that have been making headlines? To answer these questions and more, we're joined by a few of the many contributors who are actually building Maven 4 and stewarding its ecosystem. Guests    Hervé Boutemy       https://www.linkedin.com/in/hboutemy/     Guillaume Nodet       https://www.linkedin.com/in/guillaumenodet/     Maarten Mulders       https://www.linkedin.com/in/mthmulders/  Content 00:00 Introduction of the topic and guests 04:23 Status of Maven 4 release    https://maven.apache.org/whatsnewinmaven4.html     https://maven.apache.org/guides/mini/guide-migration-to-mvn4.html  07:57 Why we needed a new Maven version    https://maarten.mulders.it/2020/11/whats-new-in-maven-4/     https://maarten.mulders.it/2021/03/introduction-to-maven-toolchains/     https://www.javaadvent.com/2021/12/from-maven-3-to-maven-5.html  12:37 You can already start using Maven 4 14:35 Some benefits of switching to Maven 4 18:52 Changes in the pom file, and yes, still XML 20:30 Changes for Maven plugin developers and integrators 22:24 Changes for Maven users, for instance, the need for Java 17 28:34 Maven The Tool versus Maven The Repository 34:51 Reasons for the change in authentication for uploads to Maven Central 36:01 The one and only Maven Central URL to use    https://central.sonatype.com/  38:04 About the very first "server" hosting the Maven repository 40:32 The importance of setting up your own caching repository    https://www.sonatype.com/blog/maven-central-and-the-tragedy-of-the-commons     https://openssf.org/blog/2025/09/23/open-infrastructure-is-not-free-a-joint-statement-on-sustainable-stewardship/     https://www.youtube.com/watch?v=t74ClffSUW0  44:04 The relationship between POM, BOM, BOM-POM , and SBOM 49:43 Gradle versus Maven 57:54 How to contribute to Maven or any other open-source project, and how to get the support of your company to do so 01:05:23 How to upgrade your projects from Maven 3 to 4    https://maven.apache.org/tools/mvnup.html

    1 h y 7 min
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The podcast of foojay.io, a central resource for the Java community’s daily ​information needs, a place for friends of OpenJDK, ​and a community platform for the Java ecosystem​ — bringing together and helping Java professionals everywhere.

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