Java 191
Java is the core topic across this site. These posts cover modern Java features, OpenJDK evolutions, performance tuning, tooling, and hands-on development lessons from real projects.
Sheetmusic4J 0.0.3: ABC Notation, Guitar Pro, Engraving Improvements
Last week I introduced Sheetmusic4J , a Java(FX) library to render and interact with sheet music. That first 0.0.1 release was really a question more than a product: is there any …
Introducing Sheetmusic4J, a Java(FX) Library to Render and Interact with Sheet Music
I’m building MelodyMatrix with my son, an application to look at and play along with music. The app already shows a song in different views: falling blocks, chords, guitar …
First Test of Java on Banana Pi (ARM and RISC-V), Plus a Blinking LED with Pi4J
As part of my 2026 learning goals around Java on RISC-V (see this post about x86 versus ARM versus RISC-V ), I’ve asked various suppliers to send me evaluation boards. I …
Foojay Podcast #100: Java Podcasters on Why They Started, What Broke, and What They Learned
Foojay Podcast hits episode 100. No plan, no roadmap, it just happened. To mark the occasion, I turned the microphone around and invited other podcasters from the Java community to …
My Book 'Java Programming for Raspberry Pi' is Now Available as Softcover and Hardcover on Amazon
“Java Programming for Raspberry Pi: A Hands-On Guide to Electronics and IoT Projects” is now available as a softcover and hardcover paper book through Amazon, on top of …
Closing the Visual Gap Between the Official Lottie Webplayer and Lottie4J
A Lottie library is only as good as its output looks. If an animation renders differently in Lottie4J than it does in the official web player, that’s a bug, even when no …
Foojay Podcast #99: Testing the Untestable, LLM Security for Java Developers with Tiberius
Unit testing assumes that the same input gives the same output. Large language models break that assumption on purpose, which leaves Java developers wiring LLMs into their …
Foojay Podcast #98: The End of JNI Pain, How WebAssembly Is Quietly Replacing Native Libraries in Java
JNI has been the standard answer for calling native code from Java for almost three decades. It also brings most of the headaches anyone who has wrestled with it remembers: brittle …
Lottie4J Meets LottieFiles: A Conversation with Naail Abdul Rahman
Lottie animations run on Android, iOS, and the web. Getting them working on the JVM is a different story. Lottie4J started as a question: can JavaFX render them without a WebView? …
Foojay Podcast #97: From Scripting Language to AI Powerhouse with BoxLang
If you write Java day to day, the AI tooling conversation often defaults to Python. BoxLang takes a different route. It runs on the JVM, treats AI as a first-class concern, and …
Foojay Podcast #96: Local AWS Development Without LocalStack: Meet Floci, the GraalVM-Powered Alternative
Running AWS services on your laptop usually means waiting for a heavy emulator to boot, watching memory fill up, and hoping the API behavior matches the real cloud. Floci takes a …
Is Your Java App Actually Secure, Or Does It Just Look That Way?
Your Java app passes the build, the tests are green, and the dashboard looks fine. But are the libraries underneath still maintained, or are they quietly collecting …
Foojay Podcast #94: More Than a Blog: How Foojay Connects, Sustains, and Evolves the Java Community
What keeps a developer community alive after six years, and what does it take to stay relevant while AI reshapes how we write code? For Foojay’s sixth anniversary, we …
JCast: Van Commodore 64 tot Java Champion: code begrijpelijk maken
Code only helps people when they can read it, run it, and understand what it does. That same idea applies to documentation, to teaching kids how to program, and to the way …
Links from the JCON talk 'Foreign Function & Memory (FFM) API on Raspberry Pi'
These are the links from the JCON talk in Cologne, Germany, on April 22, 2026: “The Wait is Over: Foreign Function & Memory (FFM) API brings modern Java to the Raspberry …
MelodyMatrix V1.0.0 Released: Shipping a JavaFX App with jDeploy, GitHub Actions, and Auto-Update
Some side projects take a while to get to a proper release. MelodyMatrix is one of those. The app has been downloadable for quite some time thanks to jDeploy , but there was no …
Foojay Podcast #93: Update Your JDK, Read More Code, and Talk to Your Users: Interviews From VoxxedDays Amsterdam
A hallway at a Java conference often teaches you more than the talks. People share what broke in production, which JDK version finally pushed them off Java 8, and what tools …
Lottie4J 1.2.0: dotLottie Support, Marker Playback, Cropping, and a Big Speed Boost
Version 1.2.0 of Lottie4J is out, and it’s again a big release! The headline feature is support for the .lottie container format, but that’s just the start. This …
Foojay Podcast #92: Java 26 Is Here: What's New, What's Gone, and Why It Matters in 2026
Java 26 lands on March 17 with ten JEPs, a mix of cleanups, performance work, and new language features. Teams running on older LTS releases face a familiar question. What changes …
Lottie4J 1.1.0: Better Rendering, Smarter Debugging, and an animated Lottie4J Logo!
Just one week after the first public release of Lottie4J , the open-source Java library for rendering Lottie animations in JavaFX, version 1.1.0 is already out. And it’s a …