JavaFX launch failure with ExceptionInInitializerError does not exit normally.

[dg444]

I've setup and run the sample HelloFX app using JDK23+JavaFX23 (same with EA JDK24+JavaFX24). If there is a runtime issue in the static initialisation, the error is reported but JVM does not exit normally - I assume JavaFX non-daemon threads are running.

Demonstrate this by running the following class with and without "-DHelloFX.crash=" in the command line:

// OK - stack trace + exit:
// java --module-path yourmods;C:\java\javafx-sdk-23\lib -m mymodule/HelloFX
// Fail - stack trace and locks VM:
// java --module-path yourmods;C:\java\javafx-sdk-23\lib -DHelloFX.crash= -m mymodule/HelloFX

public class HelloFX extends Application {
    static {
        if (System.getProperty("HelloFX.crash") != null)
            throw new java.lang.ExceptionInInitializerError("HelloFX.crash");
    }
    public static void main(String[] args) {
        Application.launch(HelloFX.class, args);
    }

    @Override
    public void start(Stage stage) {
        String javaVersion = System.getProperty("java.version");
        String javafxVersion = System.getProperty("javafx.version");
        Label l = new Label("Hello, JavaFX " + javafxVersion + ", running on Java " + javaVersion + ".");
        Scene scene = new Scene(new StackPane(l), 640, 480);
        stage.setScene(scene);
        stage.show();
    }
}

Add another class calling the same main(), and all is fine - ie there is a failure as expected and JVM exits:

public class LaunchHelloFX {
    static {
        if (System.getProperty("LaunchHelloFX.crash") != null)
            throw new java.lang.ExceptionInInitializerError("LaunchHelloFX.crash");
    }
    public static void main(String[] args) {
        HelloFX.main(args);
    }
}

// OK - stack trace + exit:
// java --module-path yourmods;C:\java\javafx-sdk-23\lib -m mymodule/LaunchHelloFX
// OK - stack trace + exit:
// java --module-path yourmods;C:\java\javafx-sdk-23\lib -DHelloFX.crash= -m mymodule/LaunchHelloFX

Expected result for all launches should be stack trace and JVM exit:

Exception in thread "main" java.lang.reflect.InvocationTargetException
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:118)
at java.base/java.lang.reflect.Method.invoke(Method.java:580)
at java.base/sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:1164)
Caused by: java.lang.ExceptionInInitializerError: HelloFX.crash
at fxexample/HelloFX.(Unknown Source)
at java.base/jdk.internal.misc.Unsafe.ensureClassInitialized0(Native Method)
at java.base/jdk.internal.misc.Unsafe.ensureClassInitialized(Unsafe.java:1161)
at java.base/jdk.internal.reflect.MethodHandleAccessorFactory.ensureClassInitialized(MethodHandleAccessorFactory.java:340)
at java.base/jdk.internal.reflect.MethodHandleAccessorFactory.newMethodAccessor(MethodHandleAccessorFactory.java:71)
at java.base/jdk.internal.reflect.ReflectionFactory.newMethodAccessor(ReflectionFactory.java:154)
at java.base/java.lang.reflect.Method.acquireMethodAccessor(Method.java:726)
at java.base/java.lang.reflect.Method.invoke(Method.java:577)
at javafx.graphics@23/com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:464)
at javafx.graphics@23/com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:364)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)