Error resolving FXML file

[aalmiray]

As a follow up t #67, there seems to be a problem when resolving types consumed in an FXML file. The following code fails

App.java

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Scene;
import javafx.scene.layout.HBox;
import javafx.stage.Stage;

import java.net.URL;

public class App extends Application {
    @Override
    public void start(Stage stage) throws Exception {
        URL location = getClass().getResource("app.fxml");
        FXMLLoader fxmlLoader = new FXMLLoader(location);
        HBox hbox = fxmlLoader.load();

        Scene scene = new Scene(hbox);
        stage.setScene(scene);
        stage.setTitle("App");
        stage.show();
    }

    public static void main(String[] args) {
        launch();
    }
}

module-info.java

module app {
    exports app;
    requires javafx.base;
    requires javafx.graphics;
    requires javafx.controls;
    requires javafx.fxml;
}

layers.toml

[layers.javafx]
    modules = [
        "org.openjfx:javafx-base:jar:{{os.detected.jfxname}}:{{javafx_version}}",
        "org.openjfx:javafx-controls:jar:{{os.detected.jfxname}}:{{javafx_version}}",
        "org.openjfx:javafx-graphics:jar:{{os.detected.jfxname}}:{{javafx_version}}",
        "org.openjfx:javafx-fxml:jar:{{os.detected.jfxname}}:{{javafx_version}}"]
[layers.core]
    modules = [
        "org.kordamp.ikonli:app:{{project_version}}"]
    parents = ["javafx"]
[main]
  module = "app"
  class = "app.App"

versions.properties

project_version = 12.0.1-SNAPSHOT
javafx_version = 11

The error I get is

Exception in Application start method
Exception in thread "main" java.lang.RuntimeException: Couldn't run module main class
	at org.moditect.layrry.internal.LayersImpl.run(LayersImpl.java:139)
	at org.moditect.layrry.Layrry.launch(Layrry.java:56)
	at org.moditect.layrry.Layrry.run(Layrry.java:50)
	at org.moditect.layrry.launcher.LayrryLauncher.launch(LayrryLauncher.java:53)
	at org.moditect.layrry.launcher.LayrryLauncher.main(LayrryLauncher.java:35)
Caused by: java.lang.reflect.InvocationTargetException
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:564)
	at org.moditect.layrry.internal.LayersImpl.run(LayersImpl.java:136)
	... 4 more
Caused by: java.lang.RuntimeException: Exception in Application start method
	at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:900)
	at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(LauncherImpl.java:195)
	at java.base/java.lang.Thread.run(Thread.java:832)
Caused by: javafx.fxml.LoadException: 
file:///Users/aalmiray/.m2/repository/org/kordamp/ikonli/app/12.0.1-SNAPSHOT/app-12.0.1-SNAPSHOT.jar!/app/app.fxml

	at javafx.fxml/javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2625)
	at javafx.fxml/javafx.fxml.FXMLLoader.importClass(FXMLLoader.java:2863)
	at javafx.fxml/javafx.fxml.FXMLLoader.processImport(FXMLLoader.java:2707)
	at javafx.fxml/javafx.fxml.FXMLLoader.processProcessingInstruction(FXMLLoader.java:2676)
	at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2542)
	at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2466)
	at javafx.fxml/javafx.fxml.FXMLLoader.load(FXMLLoader.java:2435)
	at app@12.0.1-SNAPSHOT/app.App.start(App.java:33)
	at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$9(LauncherImpl.java:846)
	at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$12(PlatformImpl.java:455)
	at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
	at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427)
	at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
Caused by: java.lang.ClassNotFoundException: javafx.geometry.Insets
	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:606)
	at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:168)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
	at javafx.fxml/javafx.fxml.FXMLLoader.loadTypeForPackage(FXMLLoader.java:2931)
	at javafx.fxml/javafx.fxml.FXMLLoader.loadType(FXMLLoader.java:2920)
	at javafx.fxml/javafx.fxml.FXMLLoader.importClass(FXMLLoader.java:2861)

The javafx.geometry.Insets class is provided by the javafx.graphics module which is set as a requirement on the app module.

[aalmiray]

It's worth mentioning that marking the module as open did not make a difference.

[aalmiray]

As commented at #67 (comment) by @p-zalejko, the fix is to set an explicit classloader on the FXMLLoder instance. There's nothing to be done from Layrry's side other than documenting this use case.