Geertjan Wielenga

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Geertjan Wielenga

Geertjan is an open source and Java enthusiast, Java Champion, Apache Member, and leader of the Amsterdam Java User Group.

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Geertjan Wielenga

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Geertjan is an open source and Java enthusiast, Java Champion, Apache Member, and leader of the Amsterdam Java User Group.

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Dominika Tasarz

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I'm a community builder focused on growing the global Java and Jakarta EE ecosystems. I specialise in community strategy, open source engagement and developer-focused technical marketing, building strong and collaborative...

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Frank Delporte

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Frank Delporte is a Java Champion, Java Developer, Senior Technical Writer at Azul, Blogger, Author of "Java Programming for Raspberry Pi - A Hands-On Guide to Electronics and IoT Projects",...

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Observing Apache NetBeans with OpenTelemetry and Dash0

Table of Contents The question nobody thinks to askWhy this is more than a curiosityThe setupWhat I started withStep 1: Download the agentStep 2: Edit netbeans.confStep 3: Start NetBeansWhat arrives in Dash0Logs: the IDE's internal monologueSpans: every outbound HTTP callJVM ...

“Agentic” Was Everywhere at Money20/20 Amsterdam — Once I Started Looking

Table of Contents Core banking, reimagined as “AI-native”Payments and money movementLending, credit, and collectionsRisk, fraud, and complianceBuild-your-own-agent platforms and toolingData and infrastructure underneath it allContent, language, and trustServices and talentConclusionsI walked the floor at Money20/20 in Amsterdam with a simple …

From Zero (Really Zero) to OpenTelemetry

Table of Contents The Super Awesome PromptWhy This Prompt WorksAfter The Agent FinishesFollow Up Prompts You’ll Likely WantHere’s a super awesome prompt (e.g., for Claude Code) that you can use with https://github.com/dash0hq/agent-skills, the free collection of skills for AI coding …

Foojay Podcast #94: More Than a Blog: How Foojay Connects, Sustains, and Evolves the Java Community

Table of Contents YouTubePodcast AppsContentFoojay.io, the website for the Friends of OpenJDK, is turning six years old. To celebrate, Frank Delporte headed to JCON in Cologne, Germany, and sat down with twelve members of the Java community to talk about …

From Zero to Full Observability with Dash0

Table of Contents Before: A Service with No ObservabilityPart 1: Build the ApplicationPart 2: Containerize and PublishPart 3: Deploy to KubernetesPart 4: Generate Traffic (the Before State)After: Adding Observability with the Dash0 OperatorPart 5: Install the Dash0 OperatorPart 6: Configure …

Announcing: Sustainability for Java Developers — A New Collaborative Guide from the Foojay.io Community

Java developers from around the world are writing a book about a question that’s becoming impossible to ignore: how do we write software that’s good for both our projects and the planet? Sustainability for Java Developers: Towards an Understanding of …

Webinar: “Moving Applications From JDK 21 to JDK 25: What You Need to Know”

Table of Contents Why Upgrade?Upcoming Webinar: Your Migration GuideJDK 25 has arrived as the latest long-term support (LTS) release for Java, bringing performance improvements and enhanced stability for modern applications. If your organization is running JDK 21, now is the …

Super Early Bird Tickets: Voxxed Days Amsterdam

Table of Contents Speaker Line-upTickets & ParticipationAfter this year’s success, the Voxxed Amsterdam team is proud to announce that next year will be even bigger, with more speakers, breakouts, sponsors, and attendees. We warmly invite you to join and meet us at …

Take the State of Java 2025 Survey

Do you want to know which Java JDK distribution is used where for what and when? The time has come again to take the State of Java Survey and share insights while gaining Java ecosystem knowledge. All those participating will …

Ai4Devs Amsterdam: Successful Inaugural Developer-Focused AI Conference

Table of Contents 50% Live CodingThe inaugural AI4Devs conference in Amsterdam, held recently Friday 19 September, a collaboration between Java Champion Jonathan Vila, local developer agency IO Digital (in particular Joost Kaan, Arno Koehler, and Michel Blankenstein), and the Friends of OpenJDK (Foojay.io), …

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