Lottie4J on webtechie.be

Closing the Visual Gap Between the Official Lottie Webplayer and Lottie4J

Thu, 02 Jul 2026 00:00:00 +0000

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 exception is thrown and the code looks correct.

Lottie4J Meets LottieFiles: A Conversation with Naail Abdul Rahman

Thu, 04 Jun 2026 00:00:00 +0000

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? That question turned into a library with a first release in March 2026! Since then, I received the first pull requests, recently added headless unit testing with JavaFX 26, and now this: a video conversation with Naail from the LottieFiles team.

Testing Lottie4J JavaFX Animations in GitHub Actions Without a Display: JavaFX 26 Headless to the Rescue

Mon, 20 Apr 2026 00:00:00 +0000

When I released Lottie4J 1.1.0 , I mentioned something a bit embarrassing in the release notes and this blog post : there was a new unit test to compare the JavaFX player output against a JavaScript reference player, but it “can not run on CI, because it requires a display output.” A TODO. A known limitation. One of those notes you write hoping future-you will figure it out.

Lottie4J 1.2.0: dotLottie Support, Marker Playback, Cropping, and a Big Speed Boost

Fri, 20 Mar 2026 00:00:00 +0000

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 release also brings marker-based playback, cropping, adaptive rendering, significant performance improvements, and a lot of core model fixes driven by testing more complex real-world animations.

Lottie4J 1.1.0: Better Rendering, Smarter Debugging, and an animated Lottie4J Logo!

Tue, 10 Mar 2026 00:00:00 +0000

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 big one!

Introducing Lottie4J, a Java(FX) Library to Parse and Play Lottie Animation Files

Mon, 02 Mar 2026 00:00:00 +0000

I’m proud to present a new JavaFX library: Lottie4J, that brings Lottie animations to JavaFX applications. I first learned about Lottie many years ago when we were developing a mobile app. We used Lottie animations to explain to users how to operate a physical device. The animations made the instructions so much clearer than static images or text alone.

One Year as a Technical Writer at Azul: A Journey of Growth and Learning.

Sun, 11 Jun 2023 00:00:00 +0000

Writing has always been my passion, and even in my previous jobs as a developer, I stood out as the one who enjoyed creating and maintaining documentation. But June 9th, 2023, marked my first birthday as a full-time technical writer at Azul. Yes, it’s already a year ago that I changed from being a developer-who-also-writes to a writer-who-also-develops. Let’s take a moment to reflect on my incredible journey over the past year.

Open Source Projects

Mon, 01 Jan 0001 00:00:00 +0000

I spend a fair amount of time building and maintaining open-source Java projects. Most of them started from a personal itch (run Java on a Pi, render Lottie animations in JavaFX, control DMX lights from code) and grew from there. Here is a short tour of the ones I am most involved with.