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 <[email protected]> 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?
>
