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I followed these steps to create a maven project with JavaFX in intelliJ.

But, running the project results in a Runtime Exception:

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:498) 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:498) 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$155(LauncherImpl.java:182) at java.lang.Thread.run(Thread.java:745) Caused by: java.lang.NullPointerException: Location is required. at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3207) at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3175) at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3148) at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3124) at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3104) at javafx.fxml.FXMLLoader.load(FXMLLoader.java:3097) at Valor.CM.Main.start(Main.java:13) at com.sun.javafx.application.LauncherImpl.lambda$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.win.WinApplication._runLoop(Native Method)

I tried searching, and modifying the main class, but nothing seem to work so far.

Main.java:

package Valor.CM; 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(Main.class.getResource("sample.fxml")); primaryStage.setTitle("Hello World"); primaryStage.setScene(new Scene(root, 300, 275)); primaryStage.show(); } public static void main(String[] args) { launch(args); } }

Controller.java:

package Valor.CM; public class Controller { }

sample.fxml:

<?import javafx.geometry.Insets?> <?import javafx.scene.layout.GridPane?> <?import javafx.scene.control.Button?> <?import javafx.scene.control.Label?> <GridPane fx:controller="Valor.CM.Controller" xmlns:fx="http://javafx.com/fxml" alignment="center" hgap="10" vgap="10"> </GridPane>

pom.xml:

<?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>Valor.CM</groupId> <artifactId>StopServiceTester</artifactId> <version>1.0-SNAPSHOT</version> </project>
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    Your sample.fxml path is incorrect: at Valor.CM.Main.start(Main.java:13): Commented Oct 2, 2017 at 9:17
  • What should be the correct path? Right now it's in the same location as the Main and Controller classes. Commented Oct 2, 2017 at 10:05
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    The question I asked is no longer relevant to me as I recreated the project using a different method. I simply ran this command and imported the mvn project to intelliJ: mvn archetype:generate -DarchetypeGroupId=com.zenjava -DarchetypeArtifactId=javafx-basic-archetype Commented Oct 2, 2017 at 11:03

1 Answer 1

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Since you're using 

Main.class.getResource("sample.fxml")

to find the resource. You shall move the sample.fxml to a folder named resources under src > main directory of your project.

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3 Comments

I moved the file, but I still get the same exception.
@AlexWeitz You should ensure that the Main.class is in the src>main>java folder and then similarily the sample.fxml is in src>main>resource. Another way to debug this is using the complete path to the resource on your directory like /Users/some/folder/some/other/path/to/sample.fxml which you can get by the file property fo sample.fxml.
I'm sorry, I couldn't solve the problem and eventually went with a different method for creating a project: mvn archetype:generate -DarchetypeGroupId=com.zenjava -DarchetypeArtifactId=javafx-basic-archetype

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