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.

Here are the JavaFX LinksOfTheMonth of May 2026. You can find the weekly lists on jfx-central.com. Did we miss anything? Is there anything you want to have included in one of the next overviews? Let us know via links@jfx-central.com.

Here are the JavaFX LinksOfTheMonth of April 2026. You can find the weekly lists on jfx-central.com. Did we miss anything? Is there anything you want to have included in one of the next overviews? Let us know via links@jfx-central.com.

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 Pi”.

There are bugs you can solve by yourself, and bugs where you just need to sit down with someone who knows the internals. This video is in the second category. MelodyMatrix uses BentoFX for its dockable panel layout. Branches, leaves, tabs on the side, content panels that open and close. It works well until something fights the layout. But I had some visual problems I could not explain, some code that felt more complicated than it should be, and no good explanation for why.

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.

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 official V1.0.0 yet. No tagged release. No moment of “okay, this is it.” Just a rolling build on every commit to the main branch.

Pi4J contributor Tom Aarts joins Frank Delporte for a hands-on session focused on hardware testing in Pi4J V4. Tom has been a long-time contributor to the Pi4J ecosystem. He added example devices, improved core code by finding gaps through real-world usage, and most recently designed the Pi4J Smoke Test hardware setup that makes integration testing on real Raspberry Pi hardware practical and repeatable.

Here are the JavaFX LinksOfTheMonth of March 2026. You can find the weekly lists on jfx-central.com. Did we miss anything? Is there anything you want to have included in one of the next overviews? Let us know via links@jfx-central.com.

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.