JavaFX: Exception in thread “JavaFX Application Thread” java.lang.RuntimeException: java.lang.reflect.InvocationTargetException

Question

I am working on Java FX project I'm created two FXML file and i want to load another pane to main pain which is Border Pane. I want to load another pane to Border Pane center area!

Here is my entry point of my project that is a Java file

package javafxapplication8;

    import java.io.IOException;
    import javafx.application.Application;
    import javafx.fxml.FXML;
    import javafx.fxml.FXMLLoader;
    import javafx.scene.Parent;
    import javafx.scene.Scene;
    import javafx.scene.input.MouseEvent;
    import javafx.scene.layout.BorderPane;
    import javafx.stage.Stage;

    /**
     *
     * @author Anu
     */
    public class JavaFXApplication8 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();
        }
        @FXML
        void handleButtonAction(MouseEvent event) throws IOException {
        }
        /**
         * @param args the command line arguments
         */
        public static void main(String[] args) {
            launch(args);
        }
    }

After that this display the main FXML file which show my Border Pane

<?xml version="1.0" encoding="UTF-8"?>
    <?import com.jfoenix.controls.JFXButton?>
    <?import javafx.scene.layout.AnchorPane?>
    <?import javafx.scene.layout.BorderPane?>

    <AnchorPane id="AnchorPane" prefHeight="200" prefWidth="320" xmlns:fx="http://javafx.com/fxml/1" xmlns="http://javafx.com/javafx/8.0.171" 
                fx:controller="javafxapplication8.FXMLDocumentController">
       <children>
          <BorderPane fx:id="rootStage" layoutX="14.0" layoutY="-14.0" prefHeight="200.0" prefWidth="320.0" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
             <left>
                <JFXButton buttonType="RAISED" 
                           onAction="#handleButtonAction"
                            text="Load Pane" BorderPane.alignment="CENTER" />
             </left>
          </BorderPane>
       </children>
    </AnchorPane>

I set a button to display specific pane to that Border Pane center area.

<left>
   <JFXButton buttonType="RAISED" 
    onAction="#handleButtonAction"
    text="Load Pane" BorderPane.alignment="CENTER" />
</left>

This is my Controller class of that Border Pane contained class

package javafxapplication8;

    import java.io.IOException;
    import java.net.URL;
    import java.util.ResourceBundle;
    import javafx.event.ActionEvent;
    import javafx.fxml.FXML;
    import javafx.fxml.FXMLLoader;
    import javafx.fxml.Initializable;
    import javafx.scene.control.Label;
    import javafx.scene.layout.BorderPane;

    /**
     *
     * @author Anu
     */
    public class FXMLDocumentController implements Initializable {

        @FXML
        private BorderPane rootStage;

        @FXML
        private void handleButtonAction(ActionEvent event) throws IOException {
            System.out.println("Button Click");
            FXMLLoader loader = new FXMLLoader();  
            loader.setLocation(javafx.stage.Stage.class.getResource("FXML.fxml"));  

            BorderPane newScene = loader.load();  
            rootStage.setCenter(newScene);  
        }

        @Override
        public void initialize(URL url, ResourceBundle rb) {
            // TODO
            System.out.println("FXMLDocumentController");
        }    

    }

And this is FXML file i want to display in Border Pane center area.

        <?xml version="1.0" encoding="UTF-8"?>
    <?import javafx.scene.control.Label?>
    <?import javafx.scene.layout.AnchorPane?>
    <?import javafx.scene.text.Font?>

    <AnchorPane id="AnchorPane" prefHeight="400.0" prefWidth="600.0" xmlns:fx="http://javafx.com/fxml/1" xmlns="http://javafx.com/javafx/8.0.171" fx:controller="javafxapplication8.FXMLController">
       <children>
          <Label layoutX="252.0" layoutY="179.0" text="Label">
             <font>
                <Font size="41.0" />
             </font>
          </Label>
       </children>
    </AnchorPane>

But when i click Button That give me bunch of errors!

Executing C:\Users\Anu\Documents\NetBeansProjects\JavaFXApplication8\dist\run922593932\JavaFXApplication8.jar using platform C:\Program Files\Java\jdk1.8.0_172\jre/bin/java
    FXMLDocumentController
    Button Click
    Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
        at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1774)
        at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1657)
        at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
        at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
        at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
        at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
        at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
        at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
        at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
        at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
        at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
        at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
        at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
        at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
        at javafx.event.Event.fireEvent(Event.java:198)
        at javafx.scene.Node.fireEvent(Node.java:8411)
        at javafx.scene.control.Button.fire(Button.java:185)
        at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:182)
        at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:96)
        at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:89)
        at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
        at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
        at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
        at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
        at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
        at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
        at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
        at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
        at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
        at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
        at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
        at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
        at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
        at javafx.event.Event.fireEvent(Event.java:198)
        at javafx.scene.Scene$MouseHandler.process(Scene.java:3757)
        at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485)
        at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762)
        at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494)
        at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:394)
        at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295)
        at java.security.AccessController.doPrivileged(Native Method)
        at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$353(GlassViewEventHandler.java:432)
        at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
        at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:431)
        at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
        at com.sun.glass.ui.View.notifyMouse(View.java:937)
        at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
        at com.sun.glass.ui.win.WinApplication.lambda$null$147(WinApplication.java:177)
        at java.lang.Thread.run(Thread.java:748)
    Caused by: java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
        at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
        at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1769)
        ... 48 more
    Caused by: java.lang.IllegalStateException: Location is not set.
        at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2434)
        at javafx.fxml.FXMLLoader.load(FXMLLoader.java:2409)
        at javafxapplication8.FXMLDocumentController.handleButtonAction(FXMLDocumentController.java:33)
        ... 58 more

My project structure:

Can anybody show me where i am missed? Thank you.

Basically, your javafx.stage.Stage.class.getResource("FXML.fxml") call is returning null which means the "location is not set". When you call Class.getResource(String) with a String that does not have a leading / it looks for the resource relative to the Class(in your case, Stage). As it is incredibly unlikely that you're storing your FXML files inside JavaFX packages the resource doesn't exist. You should be calling getClass().getResource(String) to locate the resource relative to the calling class (i.e. FXMLDocumentController). Either that, or use an absolute resource name. — Slaw
– Slaw, Commented Jul 4, 2018 at 6:58
Since there's no info about where the file/jar structure in your classpath, it's impossible to come up with the correct path... — fabian
– fabian, Commented Jul 4, 2018 at 7:00

fabian · Accepted Answer · 2018-07-04 08:08:51Z

2

There are 2 reasons

javafx.stage.Stage.class.getResource("FXML.fxml")

returns null which is the cause for the exception:

Resources not starting with / are resolved relative to the class, i.e. the resource java is looking for in this case is /javafx/stage/FXML.fxml instead of the real location of your resouce
Stage for some reason seems to use a different classloader that cannot resolve resources located in the jar. Make sure to use a different class that is loaded by a classloader that has access to the jar, e.g. using FXMLDocumentController.class

loader.setLocation(FXMLDocumentController.class.getResource("/javafxapplication8/FXML.fxml"));

Note: You may need to use Clean and Build to get the new .class file to the jar.

edited Jul 4, 2018 at 8:08

answered Jul 4, 2018 at 8:02

fabian

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1 Comment

Sahan Pasindu Nirmal Over a year ago

finally this loader.setLocation(FXMLDocumentController.class.getResource("/javafxapplication8/FXML.fxml")); piece of code save my day sir. i need to say thank you so much. and i need to say more. but comments are not allow to it, it is used for only improve the answers. :)

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