Java tutorials, experiments, and real-world projects by Frank Delporte, Java Champion, Technical Writer at Azul, and lead maintainer of Pi4J.

Whether you're running Java on a Raspberry Pi, building desktop UIs with JavaFX, exploring RISC-V single-board computers, or diving into JVM internals — you're in the right place.

Topics: Java, JavaFX, Lottie4J, Pi4J, Java on Single-Board Computers, and much more...

📘 Book: Getting Started with Java on the Raspberry Pi
🎙️ Foojay and other Podcasts
📺 Videos
🗣️ Presentations


The FFM API: How OpenJDK Changed the Game for Native Interactions (And Made Pi4J Better!)

The FFM API: How OpenJDK Changed the Game for Native Interactions (And Made Pi4J Better!)

This is a crosspost from the article I contributed to this year’s JVM Advent. The Pi4J project is a Java library that allows you to control the GPIO pins and electronic components connected to a Raspberry Pi with pure Java code. It removes the complexity of using native libraries and the Java Native Interface (JNI), allowing you to focus on your application logic.

JavaFX In Action #23 with Craig Raw about the Sparrow Bitcoin Wallet

JavaFX In Action #23 with Craig Raw about the Sparrow Bitcoin Wallet

I don’t have any bitcoin myself, but still find the idea of the blockchain and “public shared money” fascinating. And as it turns out, there is a free and open-source bitcoin wallet, created with JavaFX, that wants to help people understand how the Bitcoin system works, and make transactions easy to understand. Thanks to the work of Craig Raw, there is an easy-to-use desktop application to create and manage wallets. And while he explains the app itself, we also learn a lot about the Bitcoin ecosystem, reproducible builds, security, hardware wallets, and more!

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