Building openjfx

[Kevin Rushforth]

I hadn't tried setting `org.gradle.java.home`, but if that works, it 
might be easier than our current recipe.

-- Kevin


On 10/14/2025 2:24 AM, Nir Lisker wrote:
> Gradle tells you how to find out what you're doing wrong:
>
>     * 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.
>
>
> In any case, the error message is straightforward: "Unsupported class 
> file major version 69" means that the corresponding Java version (25) 
> is unsupported in the Gradle version you're using. You can create a 
> file inside your gradle home directory (.gradle) called 
> "gradle.properties" and set the org.gradle.java.home property to the 
> path of a previous Java version if you don't want to change your 
> global env var.
>
> On Tue, Oct 14, 2025 at 9:41 AM Michael Zucchi <notzed at gmail.com> wrote:
>
>
>     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?
>     >
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mail.openjdk.org/pipermail/openjfx-dev/attachments/20251014/aa97c1de/attachment.htm>