Javafx and Maven: Nullpointerexception: Location Is Required

JavaFX and maven: NullPointerException: Location is required

Make sure that your sample.fxml is in the src/main/resources/ directory (or a subdirectory). Then you can access the file like this:

Parent root = FXMLLoader.load(getClass().getClassLoader().getResource("sample.fxml"));

Explanation:
During the compile phase all resources and classes get copied to target/classes/. So your fxml file resides in this directory and your class in a subdirectory regarding its package name. If you call getClass().getResource("sample.fxml"); the file will be searched relative to the class file which will be this directory: target/classes/sample/.

Calling .getResource() on the classloader sets the relative search path to target/classes/ and therefore your file gets found.

P.S. You could also write:

Parent root = FXMLLoader.load(getClass().getResource("/sample.fxml"));

JavaFX Location is required. even though it is in the same package

Moving the file to the main/resources directory worked.

java.lang.NullPointerException: Location is required

Two problems exist:

1)The File path

2)The Controller was not set properly

Recommendation:

If you are using SceneBuilder, when you want to see what your controller might look like, you can go to View -> Show Sample Controller Skeleton.

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• Solution

Main class:

package application;

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.stage.Stage;
import javafx.scene.Parent;
import javafx.scene.Scene;

public class Main extends Application {

    @Override
    public void start(Stage primaryStage) {
        try {
            System.out.println(getClass().getResource("anwendung.fxml").getPath());

            //other solution
            //FXMLLoader loader = new FXMLLoader(getClass().getResource("anwendung.fxml"));
            //Parent root = loader.load();

            //Keep in mind that you are calling a static method
            Parent root = FXMLLoader.load(getClass().getResource("anwendung.fxml"));

            primaryStage.setTitle("Benutzerverwaltung");
            root.getStylesheets().add(getClass().getResource("application.css").toExternalForm());
            primaryStage.setScene(new Scene(root));
            primaryStage.show();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        launch(args);
    }
}

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Controller:

package application;

import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.scene.control.Button;
import javafx.scene.input.MouseEvent;

public class AnwendungsController {

    @FXML
    private Button closeButton;

    @FXML
    void handleCloseButtonAction(ActionEvent event) {

    }

    @FXML
    void onMouseClickedCancelBtn(MouseEvent event) {

    }

}

---

FXML:

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.text.Font?>

<AnchorPane prefHeight="140.0" prefWidth="350.0" xmlns="http://javafx.com/javafx/8.0.60" xmlns:fx="http://javafx.com/fxml/1" fx:controller="application.AnwendungsController">
  <children>
   <Button fx:id="closeButton" layoutX="18.0" layoutY="100.0" mnemonicParsing="false" onAction="#handleCloseButtonAction" onMouseClicked="#onMouseClickedCancelBtn" prefHeight="26.0" prefWidth="77.0" text="Abbrechen" />
   <Label layoutX="10.0" layoutY="27.0" prefHeight="27.0" prefWidth="342.0" text="Sie können das Systema nun verwenden" textAlignment="CENTER" textOverrun="CLIP">
     <font>
        <Font name="System Bold" size="18.0" />
     </font>
  </Label>
   </children>
  </AnchorPane>

Location is required exception when loading FXML file

The short answer is getClass().getResource("sample.fxml") returns null silently if the resource cannot be found on the runtime classpath, not the current directory etc.

So this depends on your IDE project setup, if you're using eclipse try adding the folder that sample.fxml resides in the run configuration.

Some ideas...

• try getClass().getResource("/sample.fxml") instead...
• try moving sample.fxml into the resources folder. I don't know much about your IDE, but I suspect that folder is only used for .java files... this is certainly true for gradle projects in eclipse - resources have to be in the src/main/resources tree as only that is added to the runtime classpath...

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