Exception in Application start method java.lang.reflect.InvocationTargetException

Question

I am just starting out with JavaFX, and I am trying to build a simple application with a label, text field and button which, when clicked, sets the label\'s value to that of

Answer 1

Another cause might be missing VM options:

--module-path <path-to-javafx>/javafx-sdk-11.0.2/lib 
--add-modules=javafx.controls,javafx.fxml

Answer 2

For anyone who has this exact same problem in the future, as James_D and the other answer contributors mentioned, removing the "/" at the beginning of the path fixes the problem so use

FXMLLoader loader = new FXMLLoader(Main.class.getResource("MainWindowView.fxml"));

instead of

FXMLLoader loader = new FXMLLoader(Main.class.getResource("/MainWindowView.fxml"));

Answer 3

I've been looking through this thread and the answers but the cases are a bit different for me

the code written in the main file is not as mentioned like this:

FXMLLoader loader = new FXMLLoader(Main.class.getResource("MainWindowView.fxml"));

the code in my case is like this:

FXMLLoader fxmlLoader = new FXMLLoader(App.class.getResource(fxml + ".fxml"));

and I encountered the same error(approx.)

Answer 4

guess its this ?

@FXML
void handleButton(ActionEvent event) {

Answer 5

The same problem happened to me. It's because of maven library. I have different version of jfoenix library in scene builder jfoenix:0.1.8 and in IDE jfoenix:9.0.9.so i downloaded the same version in both and it worked for me.

And also for the nullpointer exception this code worked for me:

FXMLLoader fxmlLoader=new FXMLLoader (Main.class.getResource ("sample.fxml"));
Parent root =fxmlLoader.load ();

The fxml file and Main is in same package.

Answer 6

Perform the following operation

FXMLLoader loader = new FXMLLoader(Main.class.getResource("MainWindowView.fxml"));
Parent root =  loader.load();

Remove / from in front of .fxml file name. I think it should work. It solved the same error for me.