title: How to fix this "Exception in Application start method"?
body: <p>I'm new to JavaFX and I was trying to make a JavaFX FXML Application project using Netbeans IDE but I face this exception.</p>
  
  <p>This my java class:</p>
  
  <pre><code>    public class JavaFXApplication9 extends Application {
  
          @Override
          public void start(Stage stage) throws Exception {
              Parent root = FXMLLoader.load(getClass().getResource("FXMLDocument.fxml"));
  
              Scene scene = new Scene(root);
  
              stage.setScene(scene);
              stage.show();
          }
  
          /**
           * @param args the command line arguments
           */
          public static void main(String[] args) {
              launch(args);
          }
  
      }
  </code></pre>
  
  <p>This My FXML Code:</p>
  
  <pre><code>    &lt;?xml version="1.0" encoding="UTF-8"?&gt;
  
      &lt;?import javafx.scene.control.Button?&gt;
      &lt;?import javafx.scene.layout.AnchorPane?&gt;
  
      &lt;AnchorPane id="AnchorPane" prefHeight="200" prefWidth="320" xmlns:fx="http://javafx.com/fxml/1" xmlns="http://javafx.com/javafx/8.0.171" fx:controller="javafxapplication9.FXMLDocumentController"&gt;
          &lt;children&gt;
              &lt;Button fx:id="button" layoutX="126" layoutY="90" onAction="#handleButtonAction" text="Click Me!" /&gt;
          &lt;/children&gt;
      &lt;/AnchorPane&gt;
  </code></pre>
  
  <p>This is my controller class :</p>
  
  <pre><code>    public class FXMLDocumentController implements Initializable {
  
          @FXML
          private Label label;
  
          @FXML
          private void handleButtonAction(ActionEvent event) {
              System.out.println("You clicked me!");
              label.setText("Hello World!");
          }
  
          @Override
          public void initialize(URL url, ResourceBundle rb) {
              // TODO
          }    
  
      }
  </code></pre>
  
  <p>That is Exception in Application start method <code>java.lang.reflect.InvocationTargetException</code> javafx</p>
  
  <pre><code>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$155(LauncherImpl.java:182)
      at java.lang.Thread.run(Thread.java:745)
      Caused by: java.lang.NullPointerException: Location is required.
      at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3207)
      at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3175)
      at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3148)
      at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3124)
      at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3104)
      at javafx.fxml.FXMLLoader.load(FXMLLoader.java:3097)
      at javafxapplication9.JavaFXApplication9.start(JavaFXApplication9.java:22)
      at com.sun.javafx.application.LauncherImpl.lambda$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)
      at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
      ... 1 more
      Exception running application javafxapplication9.JavaFXApplication9
      E:\Netbeans Project\JavaFXApplication9\nbproject\build-impl.xml:1052: The following error occurred 
      while executing this line:
      E:\Netbeans Project\JavaFXApplication9\nbproject\build-impl.xml:806: Java returned: 1
      BUILD FAILED (total time: 1 second)
  </code></pre>