Building openjfx

[Michael Zucchi]

Orion,

I believe you have to use openjdk 24 as gradle 8.14.x doesn't support 25.

I also had to add -Dorg.gradle.java.home=/correct/path as it insisted on 
using the wrong version of many installed locally.

Otherwise I found it pretty trivial to build, good luck.

  Z


On 14/10/25 10:52, Orion Poplawski wrote:
> So I'm stepping back to simply try building openjfx with gradlew but I 
> get:
>
> $ sh gradlew --info build
> Initialized native services in: /home/orion/.gradle/native
> Initialized jansi services in: /home/orion/.gradle/native
> The client will now receive all logging from the daemon (pid: 253483). 
> The daemon log file: 
> /home/orion/.gradle/daemon/8.14.2/daemon-253483.out.log
> Starting 2nd build in daemon [uptime: 2 mins 22.763 secs, performance: 
> 97%, GC rate: 0.00/s, heap usage: 2% of 512 MiB, non-heap usage: 9% of 
> 384 MiB]
> Using 6 worker leases.
> Now considering [/home/orion/openjfx-25/jfx25u-25-29] as hierarchies 
> to watch
> Now considering [/home/orion/openjfx-25/jfx25u-25-29/buildSrc, 
> /home/orion/openjfx-25/jfx25u-25-29] as hierarchies to watch
> Watching the file system is configured to be enabled if available
> File system watching is active
> Starting Build
> Caching disabled for Groovy DSL script compilation (settings) because:
>   Build cache is disabled
>   Not worth caching.
> Compiling settings file 
> '/home/orion/openjfx-25/jfx25u-25-29/settings.gradle' using 
> BuildScriptTransformer.
>
> FAILURE: Build failed with an exception.
>
> * What went wrong:
> BUG! exception in phase 'semantic analysis' in source unit 
> '_BuildScript_' Unsupported class file major version 69
> > Unsupported class file major version 69
>
> * Try:
> > Run with --stacktrace option to get the stack trace.
> > Run with --debug option to get more log output.
> > Run with --scan to get full insights.
> > Get more help at https://help.gradle.org.
>
> BUILD FAILED in 466ms
>
> $ java --version
> openjdk 25 2025-09-16
> OpenJDK Runtime Environment (Red_Hat-25.0.0.0.36-1) (build 25+36)
> OpenJDK 64-Bit Server VM (Red_Hat-25.0.0.0.36-1) (build 25+36, mixed 
> mode, sharing)
>
> What am I doing wrong?
>