JavaFX plugin forces Gradle to put libraries on the modulepath instead of the classpath

[mrcjkb]

How to reproduce:

• Gradle version 6.7.1
• JavaFX plugin version 0.0.9

Given a modular project with a module-info.java in its main root.
And the following Gradle config:

java {
  modularity.inferModulePath.set(true)
  toolchain {
    languageVersion.set(JavaLanguageVersion.of(11))
  }
}

And a non-modular test dependency, e.g.
testImplementation("com.tngtech.archunit:archunit-junit5:0.14.1")

And a test case, e.g.

@AnalyzeClasses(packages = "*", importOptions =  { ImportOption.DoNotIncludeTests.class })
public class ArchitectureTest {
    @ArchTest
    public static final ArchRule CYCLE_RULE = slices().matching("..(*)..").should().beFreeOfCycles();
}

When I run the test case with Gradle 6.7.1

Expected behaviour: Then the test case runs
Current behaviour: Then the test case does not run, due to a java.lang.module.ResolutionException

[mrcjkb]

I believe this plugin no longer needs to depend on the modularity plugin, which appears to be the cause of this issue (as of Gradle 6.4).

[falkoschumann]

As workaround, remove javafx-gradle-plugin and add JavaFX manually:

def openjfxGroup = 'org.openjfx'
def openjfxVersion = '15.0.1'
def osName = System.properties['os.name'].toLowerCase()
def openjfxPlatform = osName.contains('mac') ? 'mac' : osName.contains('win') ? 'win' : osName.contains('linux') ? 'linux' : null

dependencies {
  api(group: openjfxGroup, name: 'javafx-base', version: openjfxVersion, classifier: openjfxPlatform)
  api(group: openjfxGroup, name: 'javafx-graphics', version: openjfxVersion, classifier: openjfxPlatform)
  api(group: openjfxGroup, name: 'javafx-controls', version: openjfxVersion, classifier: openjfxPlatform)
}

java {
  modularity.inferModulePath = true
}

This works with Gradle 6.7. All used JavaFX modules must be added because transitiv dependencies are not solved automatically. For my use case, the javafx-gradle-plugin should only resolve transitive dependencies of JavaFX module and platform.

[mrcjkb]

Thanks.
Heres is another workaround (I haven't tested it with the javafx plugin, but it works with another plugin that has the same issue), so it should work with this one too.

configurations {
    testRuntimeClasspath {
        attributes { attribute(Attribute.of("javaModule", Boolean::class.javaObjectType), false) }
    }
    testCompileClasspath {
        attributes { attribute(Attribute.of("javaModule", Boolean::class.javaObjectType), false) }
    }
}

[abhinayagarwal]

Hi @mrcjkb ,

Would you be interested in creating a PR for the plugin to remove its dependency on the modularity plugin when used with Gradle 6.4 and later.

[mrcjkb]

Sure. I'll look into it when I have some time.