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why FXMLLoader giving error when used to load a FXML file? [duplicate]

This question already has answers here:
Module error when running JavaFx media application
(2 answers)
Closed 2 years ago.
I was following a JavaFX tutorial and wrote the following code.
All the required header files are imported.
Main.java
public class Main extends Application {
#Override
public void start(Stage primaryStage){
try {
Parent root = FXMLLoader.load(getClass().getResource("Main.fxml"));
Scene scene = new Scene(root);
scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());
primaryStage.setScene(scene);
primaryStage.setTitle("Random Number Generator");
primaryStage.show();
}catch(Exception e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
launch(args);
}
}
Main.fxml (created using SceneBuilder)
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.layout.AnchorPane?>
<AnchorPane minHeight="100.0" minWidth="100.0" prefHeight="300.0" prefWidth="500.0" xmlns="http://javafx.com/javafx/8.0.171" xmlns:fx="http://javafx.com/fxml/1" fx:controller="application.MainController">
<children>
<Button id="button_generateRandomNumber" layoutX="171.0" layoutY="212.0" mnemonicParsing="false" onAction="#generateRandom" text="Generate Random Number" textAlignment="CENTER" textFill="#1e4d0e" />
<Label fx:id="message" layoutX="112.0" layoutY="143.0" prefHeight="45.0" prefWidth="258.0" textAlignment="CENTER" />
</children>
</AnchorPane>
StackTrace
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:564)
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:564)
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$2(LauncherImpl.java:195)
at java.base/java.lang.Thread.run(Thread.java:832)
Caused by: java.lang.IllegalAccessError: class com.sun.javafx.fxml.FXMLLoaderHelper (in unnamed module #0x5d85fddd) cannot access class com.sun.javafx.util.Utils (in module javafx.graphics) because module javafx.graphics does not export com.sun.javafx.util to unnamed module #0x5d85fddd
at com.sun.javafx.fxml.FXMLLoaderHelper.<clinit>(FXMLLoaderHelper.java:38)
at javafx.fxml.FXMLLoader.<clinit>(FXMLLoader.java:2056)
at application.Main.start(Main.java:20)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$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$10(PlatformImpl.java:428)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$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.win.WinApplication._runLoop(Native Method)
at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:174)
... 1 more
Exception running application application.Main
I have tried every combination with getResource("Main.fxml") including relative and absolute path in every way possible still I am getting the error.
code is 100% same as of that tutorial.

In order to javafx work, you need to either download and import javafx sdk to your project or specify dependency, if you are using build tool like Maven or Gradle.
Moreover you need to add required modules (in this case javafx's .jars) either by using module-info.java and specifying required modules there, or adding modules to VM arguments - https://openjfx.io/openjfx-docs/#install-javafx.
Bonus:
Note that javafx was present in JDK up to version 10. Since version 11, they removed it. That is why you need to import javafx somehow to your project.

JavaFX Maven Exception in Application start method

So I've been stuck with this problem for a few days now. I found and read a lot of posts here on stackoverflow and other sites, but none of the solutions worked for me. I have a problem with my JavaFX in my maven project. I use java 15 and JavaFX 15.0.1.
Here are files that I have in my project:
The pom.xml file:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.example</groupId>
<artifactId>Maven_javaFx</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<maven.compiler.source>15</maven.compiler.source>
<maven.compiler.target>15</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>org.openjfx</groupId>
<artifactId>javafx-controls</artifactId>
<version>15.0.1</version>
</dependency>
<dependency>
<groupId>org.openjfx</groupId>
<artifactId>javafx-graphics </artifactId>
<version>15.0.1</version>
</dependency>
<dependency>
<groupId>org.openjfx</groupId>
<artifactId>javafx-fxml</artifactId>
<version>15.0.1</version>
</dependency>
</dependencies>
</project>
Here is my Main.java class:
package main;
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("src/main/java/resources/mainH/view.fxml"));
primaryStage.setTitle("Hello World");
primaryStage.setScene(new Scene(root, 300, 275));
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
Here is the view.fxml file:
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>
<AnchorPane prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/11.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="controllers.controller">
<children>
<Pane layoutX="200.0" layoutY="100.0" prefHeight="200.0" prefWidth="200.0">
<children>
<Button layoutX="74.0" layoutY="100.0" mnemonicParsing="false" text="Button" />
</children>
</Pane>
</children>
</AnchorPane>
Here is the message that pops out when I try to compile my code:
C:\Users\rafal\.jdks\openjdk-15\bin\java.exe --add-modules javafx.base,javafx.graphics --add-reads javafx.base=ALL-UNNAMED --add-reads javafx.graphics=ALL-UNNAMED "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2020.2.3\lib\idea_rt.jar=64406:C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2020.2.3\bin" -Dfile.encoding=UTF-8 -classpath C:\Users\rafal\Desktop\studia\Różne\Maven_javaFx\target\classes;C:\Users\rafal\.m2\repository\org\openjfx\javafx-controls\15.0.1\javafx-controls-15.0.1.jar;C:\Users\rafal\.m2\repository\org\openjfx\javafx-controls\15.0.1\javafx-controls-15.0.1-win.jar;C:\Users\rafal\.m2\repository\org\openjfx\javafx-graphics\15.0.1\javafx-graphics-15.0.1.jar;C:\Users\rafal\.m2\repository\org\openjfx\javafx-graphics\15.0.1\javafx-graphics-15.0.1-win.jar;C:\Users\rafal\.m2\repository\org\openjfx\javafx-base\15.0.1\javafx-base-15.0.1.jar;C:\Users\rafal\.m2\repository\org\openjfx\javafx-base\15.0.1\javafx-base-15.0.1-win.jar;C:\Users\rafal\.m2\repository\org\openjfx\javafx-fxml\15.0.1\javafx-fxml-15.0.1.jar;C:\Users\rafal\.m2\repository\org\openjfx\javafx-fxml\15.0.1\javafx-fxml-15.0.1-win.jar -p C:\Users\rafal\.m2\repository\org\openjfx\javafx-base\15.0.1\javafx-base-15.0.1-win.jar;C:\Users\rafal\.m2\repository\org\openjfx\javafx-graphics\15.0.1\javafx-graphics-15.0.1-win.jar main.Main
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:64)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
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:64)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at java.base/sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:1071)
Caused by: java.lang.RuntimeException: Exception in Application start method
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:900)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(LauncherImpl.java:195)
at java.base/java.lang.Thread.run(Thread.java:832)
Caused by: java.lang.IllegalAccessError: class com.sun.javafx.fxml.FXMLLoaderHelper (in unnamed module #0x5d7c5b47) cannot access class com.sun.javafx.util.Utils (in module javafx.graphics) because module javafx.graphics does not export com.sun.javafx.util to unnamed module #0x5d7c5b47
at com.sun.javafx.fxml.FXMLLoaderHelper.<clinit>(FXMLLoaderHelper.java:38)
at javafx.fxml.FXMLLoader.<clinit>(FXMLLoader.java:2138)
at main.Main.start(Main.java:13)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$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$10(PlatformImpl.java:428)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$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.win.WinApplication._runLoop(Native Method)
at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:174)
... 1 more
Exception running application main.Main
Most post that I saw with that issue were resolved by changing the directory in getResource() method.I tried that and many other solutions as you can probably see in pom file. I ask you for help in resolving this problem as I have no more ideas on what to do. Any help will be appreciated.
Thank you for helping in advance.

Thanks to a comment from #JoséPereda I found the solution to my problem. The issue was missing JavaFX Maven plugin and missing VM arguments.

Failure # Application Start Method (JavaFX 11, JDK 14 & Intellij)

I'll try to keep this short but include as many details as I can, basically i'm trying to create a simple MPG calculator using Javafx but I've ran into a snag, whenever I attempt to run the main file some errors appear regarding the FXMLLoader but I cant for the life of me figure out why, I researched as many Q&A's as I could (and there is a lot of them) and I tried implementing the answers given but none of them worked.
Im pretty sure this is the cause of my pain.
Parent root = FXMLLoader.load(getClass().getResource("/sample/sample.fxml"));
I am pretty much a newbie when it comes to javafx so any assistance would be appreciated, if more information is required I will provide it.
File Structure
File Structure
Main
package sample;
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("/sample/sample.fxml"));
primaryStage.setScene(new Scene(root, 300, 275));
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
sample.FXML
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.layout.ColumnConstraints?>
<?import javafx.scene.layout.GridPane?>
<?import javafx.scene.layout.RowConstraints?>
<?import javafx.scene.text.Font?>
<GridPane alignment="center" hgap="10" prefHeight="267.0" prefWidth="251.0" vgap="10" xmlns:fx="http://javafx.com/fxml/1" xmlns="http://javafx.com/javafx/11.0.1" fx:controller="sample.Controller">
<columnConstraints>
<ColumnConstraints />
</columnConstraints>
<rowConstraints>
<RowConstraints />
</rowConstraints>
<children>
<AnchorPane prefHeight="279.0" prefWidth="251.0">
<children>
<Label layoutX="12.0" layoutY="14.0" prefHeight="35.0" prefWidth="233.0" text="Miles Per Gallon Calculator" textAlignment="CENTER" underline="true">
<font>
<Font size="19.0" />
</font>
</Label>
<Label layoutX="16.0" layoutY="69.0" prefHeight="27.0" prefWidth="50.0" text="Miles">
<font>
<Font size="18.0" />
</font>
</Label>
<Label layoutX="16.0" layoutY="113.0" prefHeight="27.0" prefWidth="68.0" text="Gallons">
<font>
<Font size="18.0" />
</font>
</Label>
<Button layoutX="27.0" layoutY="151.0" mnemonicParsing="false" onAction="#calculateMPG" prefHeight="42.0" prefWidth="206.0" text="Calculate MPG" />
<TextField fx:id="milesField" layoutX="84.0" layoutY="70.0" />
<TextField fx:id="gallonsField" layoutX="84.0" layoutY="114.0" />
<Label layoutX="16.0" layoutY="204.0" prefHeight="27.0" prefWidth="68.0" text="MPG">
<font>
<Font size="18.0" />
</font>
</Label>
<TextField fx:id="mpgField" layoutX="84.0" layoutY="205.0" />
</children>
</AnchorPane>
</children>
</GridPane>
Controller
package sample;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.scene.control.TextField;
import java.text.DecimalFormat;
public class Controller {
DecimalFormat df = new DecimalFormat("#.###"); double mpg;
#FXML
private TextField milesField;
#FXML
private TextField gallonsField;
#FXML
private TextField mpgField;
#FXML
void calculateMPG(ActionEvent event) {
try {
double miles = Double.parseDouble(milesField.getText());
double gallons = Double.parseDouble(gallonsField.getText());
if(gallons == 0){
mpgField.setText("Cannot Divide by zero");
}
else {
mpg = miles / gallons;
mpgField.setText(df.format(mpg));
}
} catch (NumberFormatException e){
mpgField.setText("Please enter real numbers.");
}
}
}
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:564)
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:564)
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$2(LauncherImpl.java:195)
at java.base/java.lang.Thread.run(Thread.java:832)
Caused by: java.lang.NoSuchMethodError: 'java.lang.Object sun.reflect.misc.ReflectUtil.newInstance(java.lang.Class)'
at javafx.fxml.FXMLLoader$ValueElement.processAttribute(FXMLLoader.java:927)
at javafx.fxml.FXMLLoader$InstanceDeclarationElement.processAttribute(FXMLLoader.java:971)
at javafx.fxml.FXMLLoader$Element.processStartElement(FXMLLoader.java:220)
at javafx.fxml.FXMLLoader$ValueElement.processStartElement(FXMLLoader.java:744)
at javafx.fxml.FXMLLoader.processStartElement(FXMLLoader.java:2707)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2527)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2441)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3214)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3175)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3148)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3124)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3104)
at javafx.fxml.FXMLLoader.load(FXMLLoader.java:3097)
at sample.Main.start(Main.java:13)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$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$10(PlatformImpl.java:428)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$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.win.WinApplication._runLoop(Native Method)
at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:174)
... 1 more
Exception running application sample.Main
Process finished with exit code 1
As a quick side note, I was having issues setting up IntelliJ, for some reason when I imported JDK 14 for non-javafx programming it didnt import in any of the Jar files so I had to manually import those modules, same goes for JavaFX modules, here is the images of those as well, if something appears incorrect please let me know.
JDK1
JDK2
JDK3
Edit:
Just did a clean install of IntelliJ, JAvaFX,& JDK14, still got the same issue when I attempted to run the basic JavaFX "hello world" although the errors given are much more descriptive, Ill post the new errors here.
Exception in Application start method
java.lang.reflect.InvocationTargetException
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:464)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:363)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at java.base/sun.launcher.LauncherHelper$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$2(LauncherImpl.java:195)
at java.base/java.lang.Thread.run(Thread.java:832)
Caused by: java.lang.IllegalAccessError: class com.sun.javafx.fxml.FXMLLoaderHelper (in unnamed module #0x6af6aa0c) cannot access class com.sun.javafx.util.Utils (in module javafx.graphics) because module javafx.graphics does not export com.sun.javafx.util to unnamed module #0x6af6aa0c
at com.sun.javafx.fxml.FXMLLoaderHelper.<clinit>(FXMLLoaderHelper.java:38)
at javafx.fxml.FXMLLoader.<clinit>(FXMLLoader.java:2056)
at sample.Main.start(Main.java:13)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$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$10(PlatformImpl.java:428)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$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.win.WinApplication._runLoop(Native Method)
at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:174)
... 1 more
Exception running application sample.Main
Process finished with exit code 1
Edit 2:
Finally cleaned up the errors, after adding this line (see below) to VM options a single issue appeared. (Yes i put my path)
-p /%EnterPathToJavaFX%/lib --add-modules javafx.controls
Error occurred during initialization of boot layer
java.lang.module.FindException: Module javafx.base not found
Going to do some tinkering with the modules folder and see if i can fix this.

So after working on this for a couple of hours, i got a handle on the VM options (which was something I wasnt aware of when i first started) but i'm pretty sure the issue was caused by the use of forward and backward slashes, in a lot of the answers I read, they used forwards slashes instead of backwards slashes, I didnt realize this until about ten minutes ago, its a little embarrassing but, lesson learned.
Anyways, if youre still having this issue i'll give a basic rundown on what should be done (although there are a ton of good answers out there, just remember to use backslashes, dont be a dumb dumb like me).
Important Note: This implementation is for Windows Systems
1st:
Ensure that you have your JDK and JavaFX downloaded, try to keep the folder names simple (like JDK14 or JavaFX14).
2nd:
Open a new project and select your "Project SDK", in our case select the JDK you downloaded.
3rd:
After creating the project go to File -> Project Structure, then under 'Project Settings' select Libraries, then click the Plus icon to the right of project settings, select Java then navigate to your JavaFX folder and select 'lib'.
4th:
If you run the project now, you will get a runtime error, instead go to Run (at the top) then select 'Edit Configurations'. In the 'VM Options:' text field enter:
-p *Your_Drive_Partition*:\*path_to_JFX*\JavaFX\lib --add-modules=javafx.controls,javafx.fxml
And now you're done, welcome to JavaFX.
TL;DR: Forward slashes are for URI's and backslashes are for local (windows) files, do not forget this or end up in the same situation as me, going insane from doing the same thing over and over again expecting a different result.
Have a good day.

FXML Load Exception no resources specified

I am starting to build a program with SceneBuilder and JetBrains IDE, i want to internationalize the program so i made a properties file. Everything works fine on the SceneBuilder but when i try to run the program with JetBrains i get this exception
/usr/lib/jvm/java-8-oracle/bin/java -Didea.launcher.port=7532 -Didea.launcher.bin.path=/home/paulo/idea-IC-163.12024.16/bin -Dfile.encoding=UTF-8 -classpath /usr/lib/jvm/java-8-oracle/jre/lib/charsets.jar:/usr/lib/jvm/java-8-oracle/jre/lib/deploy.jar:/usr/lib/jvm/java-8-oracle/jre/lib/ext/cldrdata.jar:/usr/lib/jvm/java-8-oracle/jre/lib/ext/dnsns.jar:/usr/lib/jvm/java-8-oracle/jre/lib/ext/jaccess.jar:/usr/lib/jvm/java-8-oracle/jre/lib/ext/jfxrt.jar:/usr/lib/jvm/java-8-oracle/jre/lib/ext/localedata.jar:/usr/lib/jvm/java-8-oracle/jre/lib/ext/nashorn.jar:/usr/lib/jvm/java-8-oracle/jre/lib/ext/sunec.jar:/usr/lib/jvm/java-8-oracle/jre/lib/ext/sunjce_provider.jar:/usr/lib/jvm/java-8-oracle/jre/lib/ext/sunpkcs11.jar:/usr/lib/jvm/java-8-oracle/jre/lib/ext/zipfs.jar:/usr/lib/jvm/java-8-oracle/jre/lib/javaws.jar:/usr/lib/jvm/java-8-oracle/jre/lib/jce.jar:/usr/lib/jvm/java-8-oracle/jre/lib/jfr.jar:/usr/lib/jvm/java-8-oracle/jre/lib/jfxswt.jar:/usr/lib/jvm/java-8-oracle/jre/lib/jsse.jar:/usr/lib/jvm/java-8-oracle/jre/lib/management-agent.jar:/usr/lib/jvm/java-8-oracle/jre/lib/plugin.jar:/usr/lib/jvm/java-8-oracle/jre/lib/resources.jar:/usr/lib/jvm/java-8-oracle/jre/lib/rt.jar:/home/paulo/mysql-connector-java-5.1.41/mysql-connector-java-5.1.41-bin.jar:/home/paulo/ProjetoOrcamentos/WorkManager/out/production/WorkManager:/home/paulo/idea-IC-163.12024.16/lib/idea_rt.jar com.intellij.rt.execution.application.AppMain sample.Main
Exception in Application start method
Exception in thread "main" java.lang.RuntimeException: Exception in Application start method
at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$155(LauncherImpl.java:182)
at java.lang.Thread.run(Thread.java:748)
Caused by: javafx.fxml.LoadException: No resources specified.
/home/paulo/ProjetoOrcamentos/WorkManager/out/production/WorkManager/sample/sample.fxml:16
at javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2597)
at javafx.fxml.FXMLLoader.access$100(FXMLLoader.java:103)
at javafx.fxml.FXMLLoader$Element.resolvePrefixedValue(FXMLLoader.java:421)
at javafx.fxml.FXMLLoader$Element.processValue(FXMLLoader.java:363)
at javafx.fxml.FXMLLoader$Element.processPropertyAttribute(FXMLLoader.java:325)
at javafx.fxml.FXMLLoader$Element.processInstancePropertyAttributes(FXMLLoader.java:235)
at javafx.fxml.FXMLLoader$ValueElement.processEndElement(FXMLLoader.java:767)
at javafx.fxml.FXMLLoader.processEndElement(FXMLLoader.java:2823)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2532)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2441)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3214)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3175)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3148)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3124)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3104)
at javafx.fxml.FXMLLoader.load(FXMLLoader.java:3097)
at sample.Main.start(Main.java:13)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$162(LauncherImpl.java:863)
at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$175(PlatformImpl.java:326)
at com.sun.javafx.application.PlatformImpl.lambda$null$173(PlatformImpl.java:295)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$174(PlatformImpl.java:294)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
at com.sun.glass.ui.gtk.GtkApplication.lambda$null$49(GtkApplication.java:139)
... 1 more
This is the code i have so far
public class Main extends Application {
#Override
public void start(Stage primaryStage) throws Exception{
Parent root = FXMLLoader.load(getClass().getResource("sample.fxml"));
primaryStage.setScene(new Scene(root, 1200, 1000));
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
FXML File:
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.geometry.Insets?>
<?import javafx.scene.Cursor?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.layout.BorderPane?>
<?import javafx.scene.layout.HBox?>
<BorderPane maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8.0.111" xmlns:fx="http://javafx.com/fxml/1">
<top>
<HBox spacing="20.0" BorderPane.alignment="CENTER">
<children>
<Button mnemonicParsing="false" text="%newWorkButton">
<cursor>
<Cursor fx:constant="CLOSED_HAND" />
</cursor></Button>
<Button mnemonicParsing="false" text="%dbButton" />
</children>
<padding>
<Insets bottom="15.0" left="15.0" right="15.0" top="15.0" />
</padding>
<BorderPane.margin>
<Insets />
</BorderPane.margin>
</HBox>
</top>
</BorderPane>
I know that the problem occurred while trying to load the properties file, but why it is working in the SceneBuilder and it doesn't work when i try to run it?
PS: The problem happens when %newWorkButton or %dbButton appears because that is the part where it uses the property file.

I am answering my own post because i was able to find the answer a few days ago.
As you can see in Main i had this line loading the fxml:
Parent root = FXMLLoader.load(getClass().getResource("sample.fxml"))
But since i am using a property file i need to load it too, so this is what i did:
ResourceBundle resources = ResourceBundle.getBundle("Language/lang_pt");;
Parent root = FXMLLoader.load(getClass().getResource("sample.fxml"),resources);

I'm having a similar issue. I just found this and realized that I had forgotten to load my ResourceBundle and my app is blowing up on an i18n resource. I found my answer on this post:
javaFX application error: No resources specified

you must replace "/" with "." like this
ResourceBundle resources = ResourceBundle.getBundle("Language.lang_pt");

How do I create a custom JavaFX component library?

I've been toying with JavaFX for a while now and now I wanted to share some of the components I have built. For ease of use, I would like to be able to distribute the components as libraries, so another user can just import my libraries into JavFX project. However, building a a library file to import into SceneBuilder (SB) proved to be much harder than I had expected. I tried following this blog post but I must be doing something wrong. I want to create my own custom component, using a .fxml file and a .jar file.
I tried building this component:
TestPane.java
package pack;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.scene.layout.AnchorPane;
import java.io.IOException;
public class TestPane extends AnchorPane {
public TestPane(){
FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource("TestPane.fxml"));
fxmlLoader.setRoot(this);
fxmlLoader.setController(this);
try {
fxmlLoader.load();
} catch (IOException exception) {
throw new RuntimeException(exception);
}
}
#FXML protected void onClick(ActionEvent ae){
System.out.println("Click");
}
}
TestPane.fxml
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.*?>
<?import java.lang.*?>
<?import javafx.scene.layout.*?>
<fx:root type="AnchorPane" xmlns="http://javafx.com/javafx/8.0.40" xmlns:fx="http://javafx.com/fxml/1">
<Button fx:id="button" layoutX="6.0" layoutY="10.0" mnemonicParsing="false" text="Button" onAction="#onClick" />
</fx:root>
I use Eclipse Mars, created a new JavaFX Library project, created a new package called pack. In that package, I created the two components from above. I then right-clicked the project and selected "Export... -> Jar-file", and made no changes in the export dialogue.
I then created a new FXML project. I opened the .fxml file in SB and imported my exported .jar file, using the Import JAR/FXML File..." dialogue, and then dragged it into my view.
Here is the code for the test project I've created.
LibTest.java
package test;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
import java.io.IOException;
public class LibTest extends Application {
#Override
public void start(Stage primaryStage) throws IOException {
Parent root = FXMLLoader.load( getClass().getResource("LibTest.fxml") );
Scene scene = new Scene(root);
primaryStage.setScene(scene);
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
LibTest.fxml
<?xml version="1.0" encoding="UTF-8"?>
<?import pack.*?>
<?import java.lang.*?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.layout.AnchorPane?>
<AnchorPane prefHeight="199.0" prefWidth="126.0" xmlns:fx="http://javafx.com/fxml/1" xmlns="http://javafx.com/javafx/8.0.40">
<children>
<TestPane layoutX="34.0" layoutY="82.0" />
</children>
</AnchorPane>
I thought I had followed all the online guides and tutorials by now but there is something I must be missing. When I then try to launch my test project, I get the error bellow. I understand that Caused by: javafx.fxml.LoadException: TestPane is not a valid type. is the "key message", but what does it mean, and how do I fix this problem?
Exception in Application start method
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:389)
at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:328)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:767)
Caused by: java.lang.RuntimeException: Exception in Application start method
at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$152(LauncherImpl.java:182)
at com.sun.javafx.application.LauncherImpl$$Lambda$50/1645995473.run(Unknown Source)
at java.lang.Thread.run(Thread.java:745)
Caused by: javafx.fxml.LoadException: TestPane is not a valid type.
/D:/WorkspaceDir/ProjectDir/bin/test/LibTest.fxml:11
at javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2601)
at javafx.fxml.FXMLLoader.createElement(FXMLLoader.java:2778)
at javafx.fxml.FXMLLoader.processStartElement(FXMLLoader.java:2708)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2531)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2445)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3218)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3179)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3152)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3128)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3108)
at javafx.fxml.FXMLLoader.load(FXMLLoader.java:3101)
at test.LibTest.start(LibTest.java:15)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$159(LauncherImpl.java:863)
at com.sun.javafx.application.LauncherImpl$$Lambda$53/198061478.run(Unknown Source)
at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$172(PlatformImpl.java:326)
at com.sun.javafx.application.PlatformImpl$$Lambda$45/186276003.run(Unknown Source)
at com.sun.javafx.application.PlatformImpl.lambda$null$170(PlatformImpl.java:295)
at com.sun.javafx.application.PlatformImpl$$Lambda$48/1079803749.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$171(PlatformImpl.java:294)
at com.sun.javafx.application.PlatformImpl$$Lambda$47/237061348.run(Unknown Source)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$145(WinApplication.java:101)
at com.sun.glass.ui.win.WinApplication$$Lambda$36/2117255219.run(Unknown Source)
... 1 more
Exception running application test.LibTest
What is it that I am missing? What causes this problem and how do I fix it?

The problem is caused by the compiler (or the VM, I don't know the proper timing) does not know how to create an object of type TestPane.
Note from the error log that it says that the error occurred at D:/WorkspaceDir/ProjectDir/bin/test/LibTest.fxml:11. If we look at the LibTest.fxml, row 11, we see that this is the row that tries to create the TestPane.
The solution to the problem is to add the library file into the build path of the Java project. This will give your project the proper knowledge of how to create an object of type TestPane. Right-click the project -> Build Path -> Configure Build Path... Then, under the Libraries-tab, click Add JARs... (or Add External JARs..., if the .jar file is not located within your workspace) and find your exported .jar file.