InvocationTargetException when running a javafx program

Question

So this worked in the example from javafx when My pc had jdk 1.7.0 so this may be the new version of FX in java8 however;

I get a nice stack-trace

jfx-project-run:
Executing E:\workspace\PathFinderApp\dist\run1095471771\PathFinderApp.jar using platform C:\Program Files\Java\jdk1.8.0\jre/bin/java
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:483)
    at com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:367)
    at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:305)
    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:483)
    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:894)
    at com.sun.javafx.application.LauncherImpl.access$000(LauncherImpl.java:56)
    at com.sun.javafx.application.LauncherImpl$1.run(LauncherImpl.java:158)
    at java.lang.Thread.run(Thread.java:744)
Caused by: javafx.fxml.LoadException: 
file:/E:/workspace/PathFinderApp/dist/run1095471771/PathFinderApp.jar!/com/rpg/gui/main.fxml:11

    at javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2617)
    at javafx.fxml.FXMLLoader.access$700(FXMLLoader.java:104)
    at javafx.fxml.FXMLLoader$ValueElement.processAttribute(FXMLLoader.java:937)
    at javafx.fxml.FXMLLoader$InstanceDeclarationElement.processAttribute(FXMLLoader.java:976)
    at javafx.fxml.FXMLLoader$Element.processStartElement(FXMLLoader.java:216)
    at javafx.fxml.FXMLLoader$ValueElement.processStartElement(FXMLLoader.java:738)
    at javafx.fxml.FXMLLoader.processStartElement(FXMLLoader.java:2723)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2527)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2441)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3230)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3191)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3164)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3140)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3120)
    at javafx.fxml.FXMLLoader.load(FXMLLoader.java:3113)
    at com.rpg.gui.GUI.loadMainPane(GUI.java:34)
    at com.rpg.gui.GUI.initialize(GUI.java:20)
    at Main.start(Main.java:20)
    at com.sun.javafx.application.LauncherImpl$8.run(LauncherImpl.java:837)
    at com.sun.javafx.application.PlatformImpl$7.run(PlatformImpl.java:335)
    at com.sun.javafx.application.PlatformImpl$6$1.run(PlatformImpl.java:301)
    at com.sun.javafx.application.PlatformImpl$6$1.run(PlatformImpl.java:298)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.application.PlatformImpl$6.run(PlatformImpl.java:298)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.access$300(WinApplication.java:39)
    at com.sun.glass.ui.win.WinApplication$4$1.run(WinApplication.java:112)
    ... 1 more
Caused by: java.lang.InstantiationException: com.rpg.gui.MainController
    at java.lang.Class.newInstance(Class.java:418)
    at sun.reflect.misc.ReflectUtil.newInstance(ReflectUtil.java:51)
    at javafx.fxml.FXMLLoader$ValueElement.processAttribute(FXMLLoader.java:932)
    ... 26 more
Caused by: java.lang.NoSuchMethodException: com.rpg.gui.MainController.<init>()
    at java.lang.Class.getConstructor0(Class.java:2971)
    at java.lang.Class.newInstance(Class.java:403)
    ... 28 more
Exception running application Main
Java Result: 1

basically telling me something is wrong here "com/rpg/gui/main.fxml:11"

and that line is

<AnchorPane id="AnchorPane" prefHeight="400.0" prefWidth="600.0" xmlns:fx="http://javafx.com/fxml" fx:controller="com.rpg.gui.MainController">

so I can figure out that it doesn't like something to do with the main controller, so it has to be somthing to do with loading the fxml and the controller right? but thats about where my ideas end

MainController mainController = new MainController(path);
Pane mainPane = FXMLLoader.load(getClass().getResource("main.fxml"));
Window.setMainController(mainController);
Window.swap(path+"content.fxml");

that's the method it throws everything in anyone experienced in javaFX or know of any changes in java8 that'd do this??

I don't really know anything about JavaFX but looking at the stack trace it seems that it expects MainController to have a no-argument constructor (which it doesn't). — Radiodef
– Radiodef, Commented Apr 17, 2014 at 11:52
what is com.rpg.gui.GUI.loadMainPane(GUI.java:34)? show the code dude — user2889419
– user2889419, Commented Apr 17, 2014 at 11:53
@parsaporahmad I assume GUI.java:34 is Pane mainPane = FXMLLoader.load(getClass().getResource("main.fxml"));, as included in the OP right now. — Radiodef
– Radiodef, Commented Apr 17, 2014 at 12:00
I got rid of the constructor and im using setPath(path) now but its complaining about not seeing the location of content.fxml, should I edit the post above I mean technically speaking its fixed that issue — Matthew Optional Meehan
– Matthew Optional Meehan, Commented Apr 17, 2014 at 12:12
I don't think this has anything to do with changing from JavaFX2.2 to Java 8: your code would fail in either. — James_D
– James_D, Commented Apr 17, 2014 at 13:02

James_D · Accepted Answer · 2017-01-06 22:19:47Z

21

Your MainController doesn't have a zero-argument constructor. If the FXMLLoader encounters a fx:controller attribute on the root element, it attempts to create an instance of that controller by (effectively) calling the zero-argument constructor of the class specified in the attribute.

To fix this (the simplest way), remove the fx:controller attribute from the FXML file, and set the controller "by hand" on the FXMLLoader. You need to create an FXMLLoader instance instead of relying on the static load(...) method:

FXMLLoader loader = new FXMLLoader(getClass().getResource("main.fxml"));
loader.setController(new MainController(path));
Pane mainPane = loader.load();

edited Jan 6, 2017 at 22:19

answered Apr 17, 2014 at 12:31

James_D

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10 Comments

Inzimam Tariq IT Over a year ago

what is FXMLLoadergetClass() in the above code? i'm new in fx please help

James_D Over a year ago

@InzimamTariqIT Fixed the typo.

Inzimam Tariq IT Over a year ago

ok, my code is now working without this. I just clean and build the project and everything is fine.

Inzimam Tariq IT Over a year ago

if we remove fx:controller attribute and add controller by hand we need to add all actions by hand because if there is no reference of controller in fxml file in shows more errors for buttons and other things against which we are defining action in xml.

James_D Over a year ago

@InzimamTariqIT No, you shouldn't have to do that. It will act exactly the same way as if you declare the controller in the FXML.

|

Inzimam Tariq IT · Accepted Answer · 2017-01-06 23:29:57Z

I faced the same problem and want to share a little bit related to it. I'm using java 8 and Netbeans 8.1 and when I created a javafx FXML Application I got this one.
Here are some tips:

When you create new project clean and build your project before you try to run.
If you rename any file (controller, fxml) IDE do not apply changes to other files at least Netbeans is not doing so. So, you have to change those file names in other files manually.
You can define controller either in fxml file or in main class. If you want to define controller in main class use the method described by @James_D. If you want to define in fxml file than use fx:controller attribute as
```
 fx:controller="yourProjectName.yourFXMLDocumentControllerName"
```
and in main class reference it as
```
Parent root = FXMLLoader.load(getClass().getResource("yourFXMLFileName.fxml"));
```
If you think everything is correct but you still getting the error clean and build your project again and try to run.

Hope it would help someone.

TerryA · Accepted Answer · 2018-10-03 11:34:21Z

4

You used

Pane mainPane = FXMLLoader.load(getClass().getResource("main.fxml"));

Try

Pane mainPane = FXMLLoader.load(getClass().getResource("/main.fxml"));

edited Oct 3, 2018 at 11:34

TerryA

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answered Nov 5, 2015 at 9:02

idzik78

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1 Comment

fabian Over a year ago

This is not a solution to the issue in the question. If the path was wrong, the error message would be Location not set instead of the one posted in the question.

jdub1581 · Accepted Answer · 2014-05-14 20:41:00Z

2

I also encounter that a lot... There seems to be a bug in Scenebuilder/netbeans 8, where upon saving in Scenebuilder, it creates another xmlns:fx="..." so that may be an issue...

Also, looking at fxml's i have using java8, I have these: xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1"

where I noticed your's is: xmlns:fx="http://javafx.com/fxml"

answered May 14, 2014 at 20:41

jdub1581

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2 Comments

Matthew Optional Meehan Over a year ago

yeah that didnt seem to change much when I changed that line but without java 8 it was just running with xmlns:fx="javafx.com/fxml/1"

fabian Over a year ago

That would be an entirely different issue. If this was be the case the xml parser would complain, which would lead stacktrace that looks different. Caused by: java.lang.NoSuchMethodException: com.rpg.gui.MainController.<init>() tells you the FXMLLoader is trying to find a constructor which is not available.

parsa2820 · Accepted Answer · 2020-05-22 19:59:31Z

1

In Run >> Edit Configurations

Add this line to VM Options:

--module-path /path/to/JavaFX/lib --add-modules=javafx.controls,javafx.fxml

this worked for me after tones of search

answered May 22, 2020 at 19:59

parsa2820

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1 Comment

sirop Over a year ago

The author of the question uses Java 8. Does one have modules already in Java 8?

Ruthless · Accepted Answer · 2020-12-03 00:05:12Z

1

layout.getChildren().addAll(choiceBox, button);

I was trying to add a button to the layout, but I had not defined a button object, it looked like this :

Button button;

When I did this :

button = new Button("Click me");

Everything started working fine.

answered Dec 3, 2020 at 0:05

Ruthless

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Comments

Abderrahmane BECHIKH · Accepted Answer · 2018-08-28 08:59:16Z

0

If Any One does not fix the problem by following answers, The simple way is to create new fxml Empty class then click on edit of the fxml causin the problem and copy the xml code to the new class . Go to the start() methode, change the:

Pane mainPane = FXMLLoader.load(getClass().getResource("main.fxml"));

to

Pane mainPane = FXMLLoader.load(getClass().getResource("newClass.fxml"));

answered Aug 28, 2018 at 8:59

Abderrahmane BECHIKH

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