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

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Answer 1

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:

1. When you create new project clean and build your project before you try to run.
2. 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.

3. 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"));
   

4. 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.

Answer 2

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

Answer 3

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"

Answer 4

You used

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

Try

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

Answer 5

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();

Answer 6

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"));