Why do I get a constructor exception on JavaFX? - javafx

Question

Based on some online reference, I try to bring up a JavaFX applicaion with the simple following code.
#SpringBootApplication
public class DesktopApplication {
public static void main(String[] args) {
Application.launch(ChartApplication.class, args);
}
}
public class ChartApplication extends Application {
#Override
public void start(Stage stage) {
}
}
I can't start up the app due to an error
me#USAUS desktop % java -jar target/desktop-0.0.1-SNAPSHOT.jar
Aug 18, 2022 4:10:10 PM com.sun.javafx.application.PlatformImpl startup
WARNING: Unsupported JavaFX configuration: classes were loaded from 'unnamed module #69ec05a2'
Aug 18, 2022 4:10:15 PM com.sun.glass.ui.mac.MacApplication ambda$waitForReactivation$6
WARNING: Timeout while waiting for app reactivation
Exception in Application constructor
Exception in thread "main" java.lang.reflect.InvocationTargetException
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:568)
at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:49)
at org.springframework.boot.loader.Launcher.launch(Launcher.java:108)
at org.springframework.boot.loader.Launcher.launch(Launcher.java:58)
at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:65)
Caused by: java.lang.RuntimeException: Unable to construct Application instance: class com.example.desktop.ChartApplication
at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:891)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(LauncherImpl.java:196)
at java.base/java.lang.Thread.run(Thread.java:833)
Caused by: java.lang.NoSuchMethodException: com.example.desktop.ChartApplication.<init>()
at java.base/java.lang.Class.getConstructor0(Class.java:3585)
at java.base/java.lang.Class.getConstructor(Class.java:2271)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$8(LauncherImpl.java:802)
at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$12(PlatformImpl.java:484)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:457)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:456)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
I don't get why the class can't get constructed.
I use Java 17 and try various version of OpenJfx (versions from 18.0.2, 19 EA and 20 EA), and Spring Boot (2.7.3, 3.0.0-M4) with the same exception.

Answer 1

The cause is that JavaFX is removed from JDK after Java 11.