Building OpenJFX using the OpenJDK build system

[Laurent Bourgès]

Hi johan,

We are back to the great OpenJDK / JFX all-in-one package as it was the
case in jdk8 to 10 !

I love it,
Let's go forward now!

Cheers,
Laurent


Le sam. 27 sept. 2025, 11:56, Johan Vos <johan.vos at gluonhq.com> a écrit :

> Hi,
>
> As part of my efforts to build OpenJFX using the OpenJDK build system, I
> created a script that exactly does this. The script is used in the Github
> Action in the repository https://github.com/openjdk-mobile/openjfx-build
> . For questions about why this is done in the openjdk-mobile organisation
> on github, see below.
>
> The steps that are executed in the GhA are described in the README.md at
> https://github.com/openjdk-mobile/openjfx-build .
> Basically, this boils down to
> 1. clone latest openjdk (or openjdk/mobile)
> 2. clone latest openjfx
> 3. apply a small patch to the openjdk repository (so that it can deal with
> --with-openjfx-modules)
> 4. run the gradle tasks to generate shaderclasses (to be removed)
> 5. configure and make the openjdk image.
>
> We do have GhA scripts that can do the build on-demand, and they can be
> modified to create daily/weekly/... builds. We do not recommend to use
> these scripts for production. At least with Gluon, we do builds from a
> Jenkins system where we have full control over the environment. This allows
> us to use e.g. an ubuntu 24.04 system and deliver binaries that are working
> on ubuntu 20.04, for example.
> The value of the Github Actions, imho, is to easily detect an issue with
> new code in either of the repositories.
>
> An important thing is that this is using the very latest openjdk and
> openjfx code. As I said before: it is not hard to create builds of OpenJFX
> using the OpenJDK for a very specific version, using (very specific)
> patches. The hard thing is to do this without requiring a huge maintenance
> effort.
>
> There are many todo's left, including:
> * make it work on windows, ios and android
> * include media and webkit
> * generate shaders using the OpenJDK code-generate approach
>
> This is an open effort, so everyone is welcome to contribute. But also, if
> others want to use a different approach, I'm all fine with that.
>
> - Johan
>
> Q: Why is this in a repository that is part of the openjdk-mobile
> initiative?
> A: JavaFX is an optional, but crucial part when running Java applications
> on mobile. Since on mobile, it is even more critical to use the correct
> compilers/tools/settings/flags than it is on desktop, it is really
> beneficial to use a single build system for all components that have native
> code. Hence, while building OpenJFX using the OpenJDK build system is very
> useful for desktop platforms, it is almost a requirement when building for
> mobile platforms.
> Note that currently, we only have scripts to build OpenJFX on OpenJDK for
> linux and mac (hence not yet for mobile).
>
>
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