JavaFX Errors with FXMLLoader.load(getClass().getClassLoader().getResource("Login.fxml")); [duplicate]

Question

I can not figure out for the life of me the problem with this code. I have done research on many similar questions here, addressing whether the directories were correct, possible wrong function calls etc.

I am hoping someone can help me out. Everything is in a file called login in an app called loginapp.

Here is Login.java

/*
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 * and open the template in the editor.
 */
package login;

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


public class Login extends Application   {

    @Override
    public void start(Stage stage) throws Exception {
        FXMLLoader loader = new FXMLLoader(getClass().getResource("Login.fxml"));
        Parent root = FXMLLoader.load(getClass().getClassLoader().getResource("Login.fxml"));
        Scene scene = new Scene(root);
        stage.setScene(scene);
        stage.setTitle("Fracken");
        stage.show();
    }
}

Here is Login.fxml

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

<?import java.lang.*?>
<?import java.util.*?>
<?import javafx.scene.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>

<AnchorPane id="AnchorPane" prefHeight="317.0" prefWidth="326.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="login.Login">
   <children>
      <TextField fx:id="txtUsername" layoutX="110.0" layoutY="45.0" promptText="Username" />
      <PasswordField fx:id="txtPassword" layoutX="110.0" layoutY="115.0" promptText="Password" />
      <Button fx:id="btnLogin" layoutX="110.0" layoutY="184.0" mnemonicParsing="false" onAction="btnLoginAction" text="Login" />
      <Button fx:id="btnReset" layoutX="232.0" layoutY="184.0" mnemonicParsing="false" onAction="btnResetAction" text="Reset" />
      <Label fx:id="lblMessage" layoutX="110.0" layoutY="236.0" prefHeight="31.0" prefWidth="187.0" />
   </children>
</AnchorPane>

I am sure the issue is with

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

I get this error.

Executing C:\Users\David\Desktop\Java Project\loginapp\dist\run122343396\loginapp.jar using platform C:\Program Files\Java\jdk1.8.0_111\jre/bin/java
Exception in Application start method
Exception in thread "main" 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:498)
    at sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:767)
Caused by: java.lang.RuntimeException: Exception in Application start method
    at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917)
    at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$155(LauncherImpl.java:182)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException: Location is required.
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3207)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3175)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3148)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3124)
    at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3104)
    at javafx.fxml.FXMLLoader.load(FXMLLoader.java:3097)
    at login.Login.start(Login.java:23)
    at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$162(LauncherImpl.java:863)
    at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$175(PlatformImpl.java:326)
    at com.sun.javafx.application.PlatformImpl.lambda$null$173(PlatformImpl.java:295)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.application.PlatformImpl.lambda$runLater$174(PlatformImpl.java:294)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
    ... 1 more
Java Result: 1

Please help me, I have looked at other's similar issues on here but no solutions worked.

Answer 1

getClass().getResource("Login.fxml") should return a non-null value, since using Class.getResource looks up the resouce relative to the class. Since you seem to have placed the resource in the login package, using a class in that package with resource name Login.fxml should work.

For some reason you do not use the FXMLLoader that you pass this resource URL to. Instead you use

getClass().getClassLoader().getResource("Login.fxml")

I.e. you use the classloader to load the file. The classloader however does not know about the class you retrieve it from and therefore tries to locate Login.fxml in the default package.

If you use a classloader, you should use the full path, i.e.

getClass().getClassLoader().getResource("login/Login.fxml")