title: JavaFX InvocationTargetException
body: <p>I have the code:</p>
  
  <pre><code>package core;
  
  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);
      }
  }
  </code></pre>
  
  <p>This is my project structure: <a href="https://imgur.com/a/5ipF1" rel="nofollow noreferrer">https://imgur.com/a/5ipF1</a></p>
  
  <p>And here is my error message:</p>
  
  <pre><code>"C:\Program Files\Java\jdk-9\bin\java" "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2017.2.5\lib\idea_rt.jar=54416:C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2017.2.5\bin" -Dfile.encoding=UTF-8 -classpath C:\Users\nikoe\OneDrive\Arbeit\MysteryShopper\Java\out\production\classes;C:\Users\nikoe\.gradle\caches\modules-2\files-2.1\org.xerial\sqlite-jdbc\3.21.0.1\81a0bcda2f100dc91dc402554f60ed2f696cded5\sqlite-jdbc-3.21.0.1.jar core.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: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:473)
      at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:372)
      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$FXHelper.main(LauncherHelper.java:945)
  Caused by: java.lang.RuntimeException: Exception in Application start method
      at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:973)
      at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(LauncherImpl.java:198)
      at java.base/java.lang.Thread.run(Thread.java:844)
  Caused by: java.lang.NullPointerException: Location is required.
      at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3246)
      at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3210)
      at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3179)
      at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3152)
      at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3129)
      at javafx.fxml/javafx.fxml.FXMLLoader.load(FXMLLoader.java:3122)
      at core.Main.start(Main.java:14)
      at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$9(LauncherImpl.java:919)
      at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$11(PlatformImpl.java:449)
      at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$9(PlatformImpl.java:418)
      at java.base/java.security.AccessController.doPrivileged(Native Method)
      at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:417)
      at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$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:189)
  ... 1 more
  Exception running application core.Main
  
  Process finished with exit code 1
  </code></pre>
  
  <p>It is weird, because it worked before I added Gradle to the project. After adding Gradle I had to remark "src" as "Sources Root".</p>
  
  <p>This structure is the basic structure that IntelliJ generates for JavaFX projects.</p>
  
  <p>Any ideas? </p>