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JavaFX invalid URL or resource not found

i am having some trouble including images in my JavaFX project. The project stores the resources in the src/main/resources folder and it houses the FXML documents and all the images. The FXML documents load just fine, but the image locations all show null.
My code is as follows...
package VennDiagram;
import java.io.File;
import javax.imageio.ImageIO;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.image.Image;
import javafx.stage.Stage;
public class View extends Application{
public static Stage primaryStage;
public static Scene promptWindow;
public static Scene refactor;
public static Scene scene;
public static void main(String[] args) {
launch(args);
}
#Override
public void start(Stage stage) throws Exception{
System.out.println(getClass().getResource("/views/View.fxml"));
System.out.println(getClass().getResource("/views/openingPage.fxml"));
System.out.println(getClass().getClassLoader().getResource("/views/openingPage.css"));
primaryStage = stage;
System.out.println(getClass().getResourceAsStream("/views/newFileButton.png"));
Parent root = FXMLLoader.load(getClass().getResource("/views/View.fxml"));
Parent root2 = FXMLLoader.load(getClass().getResource("/views/openingPage.fxml"));
scene = new Scene(root);
promptWindow = new Scene(root2,1020,580);
primaryStage.setOnCloseRequest(event ->{
quitProgramAlert.display("Confirm Exit", "Are you sure you want to exit?");
if(!quitProgramAlert.closePressed) {
event.consume();
}
});
primaryStage.setMinHeight(600);
primaryStage.setMinWidth(750);
primaryStage.setTitle("VennDiagram Creator");
primaryStage.setScene(promptWindow);
primaryStage.setResizable(false);
primaryStage.show();
}
}
It gives me an error saying the resource cannot be found.
Additional Details:
The project is built using gradle. I load my FXML files in using the same method as i do for the images.
It works just fine with the the FXML documents.
EDIT: The project structure is shown below...

Swap JavaFX scene when clicking a button

I am trying to create a program to teach people about GNU/Linux and the command line, I have my main.java
package sample;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
public class Main extends Application {
Stage window;
public static void main(String[] args) {
launch(args);
}
#Override
public void start(Stage primaryStage) throws Exception {
window = primaryStage;
Parent root = FXMLLoader.load(getClass().getResource("login.fxml"));
primaryStage.setTitle("Learnix");
primaryStage.setScene(new Scene(root, 800, 500));
primaryStage.show();
}
}
And the controller to go with it.
package sample;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import java.io.IOException;
public class loginController {
public Button loginBtn;
public void loginBtnClick() throws IOException {
System.out.println("You are logged in");
}
}
I have tried things such as:
FXMLLoader.load(getClass().getResource("lessons.fxml"));
But I can't figure out how to get it to swap scenes. I have seen many tutorials on YouTube and it Stack Overflow but many of them have all of the JavaFX on the main.java and not in separate files as I am using scenebuilder.
Thank you.

You can either call Stage.setScene() to change the whole scene or just substitute a root to the new one by Scene.setRoot():
Parent newRoot = FXMLLoader.load(getClass().getResource("lessons.fxml"));
primaryStage.getScene().setRoot(newRoot);

Javafx Button With EventHandler. Getting cannot find symbol error

I am trying to get a button to print out Java is fun after being clicked and I keep getting a Cannot find symbol error when I run it. I'm not sure whether it is my import statements or an actual error in the code itself. I was wondering if someone could help me figure out why I'm getting the error?
import javafx.application.Application;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.Pane;
import javafx.stage.Stage;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
public class ButtonHandler extends Application {
#Override // Override the start method in the Application class
public void start(Stage primaryStage) {
Pane pane = new Pane();
Button btOK = new Button("OK");
pane.getChildren().add(btOK);
btOK.setOnAction((ActionEvent e) -> {
System.out.println("Java is Fun");
});
// Create a scene and place it in the stage
Scene scene = new Scene(Pane);
primaryStage.setTitle("Button Demo"); // Set title
primaryStage.setScene(scene); // Place the scene in the stage
primaryStage.show(); // Display the stage
}
public static void main(String[] args) {
launch(args);
}
}

Eclipse doesn't want to run simple JavaFX application

I have other classes named Test in other packages and one class with the same name in the default package.
When I click the Run button in Eclipse, instead of running this class, it runs another Test class from inside another package instead:
package jfx;
import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.shape.Circle;
import javafx.stage.Stage;
public class Test extends Application {
public void start(Stage stage) {
Circle circ = new Circle(40, 40, 30);
Group root = new Group(circ);
Scene scene = new Scene(root, 400, 300);
stage.setTitle("My JavaFX Application");
stage.setScene(scene);
stage.show();
}
}
How can I fix this?

Add a main method to allow Eclipse recognize the program as runnable application
public static void main(String[] args) {
Application.launch(args);
}

MiGLayout sizing not working properly in JavaFX

Here's my snippet:
package javafxdemo;
import org.tbee.javafx.scene.layout.MigPane;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.stage.Stage;
public class FXDemo extends Application {
#Override
public void start (Stage stage) throws Exception {
MigPane root = new MigPane();
Scene scene = new Scene(root);
Button b = new Button("Hello");
root.getChildren().add(b);
stage.setScene(scene);
stage.setTitle("FX");
stage.show();
}
public static void main (String[] args) {
launch (args);
}
}
When running the gui doesn't show properly: the frame size is smaller than the button. Why does it happens? In HBox Layout when setting the scene it is automatically resized, so why with MiGLayout it doesn't work?
I'm using MigLayout 4.3

So, I filed an issue and later found out a workaround for this:
just add stage.sizeToScene() after stage.show().