I have built a Windows application using the JavaFX native packager. The jar file contains manifest attribute:

SplashScreen-Image: mylogo.png

and "mylogo.png" is present at the root of the jar file.

If I run the .jar file directly (double click in Windows or use java -jar myjar.jar), the splash screen displays as expected. If however I run the .exe generated by the JavaFX packager, the splash screen image is never shown.

The splash screen is needed as the JVM takes a long time to load and display the first application screen (JavaFX stage) (upwards of 60-90 seconds) on some slow customer systems and the splash screen image provides more immediate feedback that the application is starting.