This lines are from GroovyFx project, which was written for Java 8.
What does the classpath variables mean and how can be this translated into the latest Gradle specifications?:

configurations {
    jansi.extendsFrom(runtime)
}

sourceSets {
    demo {
        compileClasspath += sourceSets.main.output + configurations.compile
        runtimeClasspath += sourceSets.main.output
     }
}

The issue may be related to migration from Gradle 5 to Gradle 8.
This generates an error when doing gradlew build:

Could not find class for Transformation Processor groovyx.javafx.beans.FXBindableASTTransformation declared by groovyx.javafx.beans.FXBindable