"gradle build" failing

[wusspuss]

./gradlew generate runs ok
But then

archie@archie-laptop:~/java-gtk$ ./gradlew build

(test:27009): GLib-GIO-CRITICAL **: 01:08:18.528: This application can not open files.

> Task :java-gtk:test

TestGdkRectangle > testRectangle() FAILED
    java.lang.UnsatisfiedLinkError at TestGdkRectangle.java:30

TestIntrospection > testTypeSize() FAILED
    java.lang.UnsatisfiedLinkError at TestIntrospection.java:21

TestIntrospection > testTypeId() FAILED
    java.lang.UnsatisfiedLinkError at TestIntrospection.java:32

TestListIndex > testListIndex() FAILED
    java.lang.UnsatisfiedLinkError at TestListIndex.java:31

27 tests completed, 4 failed

> Task :java-gtk:test FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':java-gtk:test'.
> There were failing tests. See the report at: file:///home/archie/java-gtk/java-gtk/build/reports/tests/test/index.html

* Try:
> Run with --scan to get full insights.

Deprecated Gradle features were used in this build, making it incompatible with Gradle 9.0.

You can use '--warning-mode all' to show the individual deprecation warnings and determine if they come from your own scripts or plugins.

For more on this, please refer to https://docs.gradle.org/8.5/userguide/command_line_interface.html#sec:command_line_warnings in the Gradle documentation.

BUILD FAILED in 57s
21 actionable tasks: 16 executed, 5 up-to-date
archie@archie-laptop:~/java-gtk$ 

[bailuk]

UnsatisfiedLinkError comes from INSTANCE = ch.bailu.gtk.lib.jna.Loader.load("gtk-4", Instance.class);. Either GTK 4 Libraries are not installed or they have an unexpected name.
What OS / Distribution are you using? Is libgtk-4 installed?

The gradle log gives you a link to a generated test report. This report might contain some more useful information.