To reproduce, run the following program:

import javafx.application.Application;
import javafx.application.Platform;
import javafx.stage.Stage;

public class App extends Application {

    @Override
    public void start(Stage primaryStage) {
        System.out.println("Application launched successfully");
        Platform.exit();
    }

    // non-static
    public void main(String[] args) {
        System.out.println("main method called");
        Application.launch(args);
    }

}

The following exception is thrown:

$ java App
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:62)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:565)
        at java.base/sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:1051)
Caused by: java.lang.NullPointerException
        at java.base/java.lang.reflect.Method.invoke(Method.java:558)
        at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:464)
        at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:363)
        ... 5 more