JavaFx Error: Exception in Application start method

Question

I am trying to create my first JavaFX program,using intelliJ IDEA

and i m getting this error :

Exception in Application start method
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:566)
at 
javafx.graphics/com.sun.javafx.application.LauncherImpl.
launchApplicationWithArgs(LauncherImpl.java:464)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.
launchApplication(LauncherImpl.java:363)
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:566)
at java.base/sun.launcher.LauncherHelper$FXHelper.main
(LauncherHelper.java:1051)
Caused by: java.lang.RuntimeException: Exception in Application 
start method
at 
javafx.graphics/com.sun.javafx.application.LauncherImpl.
launchApplication1(LauncherImpl.java:900)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.
lambda$launchApplication$2(LauncherImpl.java:195)
at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.lang.IllegalAccessError: class 
com.sun.javafx.fxml.FXMLLoaderHelper (in unnamed module 
@0x5ba89dd0) cannot access class com.sun.javafx.util.Utils (in 
module javafx.graphics) because module javafx.graphics does not 
export com.sun.javafx.util to unnamed module @0x5ba89dd0
at com.sun.javafx.fxml.FXMLLoaderHelper.<clinit> 
(FXMLLoaderHelper.java:38)
at javafx.fxml.FXMLLoader.<clinit>(FXMLLoader.java:2056)
at sample.Main.start(Main.java:13)
at 
javafx.graphics/com.sun.javafx.application.LauncherImpl.
lambda$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$10(PlatformImpl.java:428)
at java.base/java.security.AccessController.doPrivileged
(Native Method)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.
lambda$runLater$11(PlatformImpl.java:427)
at 
javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run
(InvokeLaterDispatcher.java:96)
at javafx.graphics/com.sun.glass.ui.gtk.GtkApplication._runLoop
(Native Method)
at 
javafx.graphics/com.sun.glass.ui.gtk.GtkApplication.
lambda$runLoop$11(GtkApplication.java:277)
... 1 more
Exception running application sample.Main

This is my FXML file :

`<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.control.Label?>
 <?import javafx.scene.layout.AnchorPane?>

 <AnchorPane prefHeight="386.0" prefWidth="621.0" 
 xmlns="http://javafx.com/javafx/8.0.172-ea" 
 xmlns:fx="http://javafx.com/fxml" fx:controller="sample.Controller">
 <children>
  <Label fx:id="m" layoutX="282.0" layoutY="192.0" text="this is a 
  test  " />
</children>
</AnchorPane>`

main.java :

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

public class Main extends Application {

@Override
public void start(Stage primaryStage) throws Exception{
Parent root=   
FXMLLoader.load(getClass().getResource("Main.fxml"));
    primaryStage.setTitle("Hello World");
    primaryStage.setScene(new Scene(root, 300, 275));
     primaryStage.show();
  }


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

  }}

this is the project structure :

project structure

I even changet the fxml file location but he keep on getting the same error.

the FXML file and Main.java are in the same package

i am Ubuntu

The image is cut exactly where the error message matters. Never post text as image, copy paste the stacktrace here in a code block so it maintains its format. — m0skit0, Mar 12 '19 at 14:35
Why did you put line breaks in there? Keep the stacktrace as it is, now it is unreadable... If you read the stacktrace you will find that the error is happening in FXMLLoaderHelper.java:38 which code you did not post. — m0skit0, Mar 12 '19 at 15:15
Caused by: java.lang.IllegalAccessError: class com.sun.javafx.fxml.FXMLLoaderHelper (in unnamed module @0x5a4c1df1) cannot access class com.sun.javafx.util.Utils (in module javafx.graphics) because module javafx.graphics does not export com.sun.javafx.util to unnamed module @0x5a4c1df1 — MehdiBal, Mar 12 '19 at 15:16
see https://stackoverflow.com/questions/53035454/javafx-module-javafx-graphics https://stackoverflow.com/questions/53617191/javafx-controls-could-not-be-found-javafx-11-jdk-11-0-1 https://stackoverflow.com/questions/53694905/javafx-modules-are-not-visible-for-vm — kai, Mar 12 '19 at 15:45

score 3 · Accepted Answer · answered Mar 12 '19 at 16:03

3

i have found the solution , i have added the JavaFX SDK to the modules and modified the module-info.java file because i am using jdk 11

module project-name {
requires javafx.fxml;
requires javafx.controls;

opens sample;
}

answered Mar 12 '19 at 16:03

MehdiBal

81
1
9

Where is the module-info.java file found? – RhysD Feb 23 '20 at 19:49

JavaFx Error: Exception in Application start method

1 Answers1