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

Question

I am trying to get my JavaFX program to run but am having some difficulty  I keep getting an error of  java lang NullPointerException  Location is required   The fxml file is in the same package as Application class  Here is my very simple code   package com kromalights designer entry   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         Override     public void start Stage primaryStage  throws Exception          Parent root   FXMLLoader load getClass   getResource  main fxml             primaryStage setTitle  Kromalights Designer            primaryStage setScene new Scene root  300  275            primaryStage show                public static void main String   args            launch args             And here is a copy of my main fxml file    lt  xml version  1 0  encoding  UTF-8   gt    lt  import java lang    gt   lt  import javafx scene layout    gt   lt  import javafx scene layout BorderPane  gt   lt  scenebuilder-stylesheet mailStyles css  gt   lt  import java net    gt    lt BorderPane prefHeight  300 0  prefWidth  300 0  xmlns fx  http   javafx com fxml 1          xmlns  http   javafx com javafx 2 2          fx controller  com kromalights designer entry Controller  gt       lt bottom gt           lt Pane prefHeight  200 0  prefWidth  200 0   gt       lt  bottom gt       lt center gt           lt Pane prefHeight  200 0  prefWidth  200 0   gt       lt  center gt       lt left gt           lt VBox prefHeight  200 0  prefWidth  100 0   gt       lt  left gt       lt top gt           lt HBox prefHeight  100 0  prefWidth  200 0   gt       lt  top gt       lt stylesheets gt           lt URL value   mainStyles css    gt       lt  stylesheets gt   lt  BorderPane gt    The controller class does exist and is in the package specified in the fxml file  All of my names are correct and are where I think they should be  What am I missing  I did try renaming my fxml file in case it was a name issue  Please help  FYI  I am using Intellij IDEA on OSX   UPDATE  This is a Maven issue  I setup Maven for this project and that caused the issue  I removed Maven temporarily so I can continue working without it  Does anyone have any insight as to how I would best handle this when using Maven

User · Answer

I have found all of the above solutions work just fine because they trigger your IDE to rebuild the project. No magic involved.

The "real" solution for this issue is that you should just ditch your previous build directory.

If you are using Maven, just delete the target folder (or do a mvn clean)!
If you're using ANT, delete that respective folder (I think it's called out)!
If you're using Gradle, delete the build folder!

User · Answer

If you look at the docs  1   you see that the load   method can take a URL   load URL location    So if you re running Java 7 or newer  you can load the FXML file like this   URL url   Paths get    src main resources fxml Fxml fxml   toUri   toURL    Parent root   FXMLLoder load url     This example is from a Maven project  which is why the FXML file is in the resources folder    1  https   docs oracle com javase 8 javafx api javafx fxml FXMLLoader htm

User · Answer

instead of   Parent root   FXMLLoader load getClass   getResource  main fxml      put  Parent root   FXMLLoader load getClass   getResource   main fxml      Difference is of          Reason     1st one   getResource will try to find the resource relative to the package  2nd one   getResource will treat it as an absolute path and simply call the classloader

User · Answer

In my case all of the above were not the problem at all   My problem was solved when I replaced    getClass   getResource  ui layout fxml     with     getClass   getClassLoader   getResource  ui layout fxml

User · Answer

I was getting the same error  In my case there was a leading space-symbol in the fxml file name     fxml example fxml  instead of  fxml example fxml   I don t know where it came from  It was very difficult to notice it  When I removed the leading space  everything went ok  I didn t even knew that file name could start with the space-symbol

User · Answer

The root directory for the loader is in the  resources  folder for a maven project   So if you have src main java then the fxml file path should start from  src main resources  https   maven apache org guides introduction introduction-to-the-standard-directory-layout html

User · Answer

URL url   new File  src main java ua adeptius goit sample fxml   toURI   toURL    Parent root   FXMLLoader load url     That is helped for me because   getClass getResource  path     always returns me null

User · Answer

I had sometimes the same Exception    When i create a FXML-File with the Wizard in Eclipse  i write example fxml in the name field  Eclipse creates a file  like example fxml fxml  With this mistake  the FXMLLoader can t find the right FXML-File  So  my tip  check the name of the FXML-Filename in your start-Method and the real Name of File   Hopes i could help  Good luck

User · Answer

This problem can be caused by incorrect path to the FXML file   If you re using absolute paths  my package views view fxml   you have to precede then with a slash   getClass   getResource   my package views view fxml     You can use relative paths as well   getClass   getResource  views view fxml

User · Answer

If your project is Maven based Idea will ignore all but java files in your src main java folder  Like you said moving the file to src main resources works  but now SceneBuilder does not know about your controller class anymore because it s in a completely different directory and you lose all the insight  you build blindly   I believe this is an issue in intellij since SceneBuilder EXPECTS to find your controller class java file in  and i quote   the same directory  a direct subdirectory or the parent directory of the  fxml  document

User · Answer

Moving the file to the main resources directory worked

User · Answer

I ve seen this error a few times now   So often that I wrote a small project  called  Simple  with a Netbeans Maven FXML application template just to go back to as a kind of  reference model  when things go askew   For testing  I use something like this       String sceneFile     fxml main fxml       Parent root   null      URL    url    null      try               url    getClass   getResource  sceneFile            root   FXMLLoader load  url            System out println     fxmlResource       sceneFile              catch   Exception ex                 System out println   Exception on FXMLLoader load               System out println       url      url            System out println           ex            System out println       ---------------------------------------- n             throw ex          When you run that snippet and the load fails  you should see a reason  or at least a message from the FXMLLoader   Since it s a test  I throw the exception   You don t want to continue   Things to note   This is a maven project so the resources will be relative to the resources folder  hence      fxml main fxml   The leading slash is required  The resource passed to the FXMLLoader is case-sensitive      If you load  main fxml  and your file is called   Main fxml     You will will see the message      java lang NullPointerException  Location is required   If you get past that  location is required  issue  then you may have a problem in the FXML     Something like this           javafx fxml LoadException        file  D  sandbox javafx app examples person target person-00 00 01-SNAPSHOT jar  fxml tableWithDetails fxml 13   Will mean that there s a problem on Line 13  in the file  per    tableWithDetails fxml  13   In the message   At this point you need to read the FXML and see if you can spot the problem   You could try some of the tips in the related question   For this problem  my opinion is that the file name was proper case   Main fxml    When the file was moved the name was probably changed or the string retyped   Good luck   Related    FXML   FXMLLoader error diagnostic tool s  sought

User · Answer

If your problem is not Maven related and you get the same NullPointerException running this in a browser  while running it from the IDE is fine   try this      -  Netbeans -  Right-Click Project -  Properties -  Build -  Deployment -  Check  Request unrestricted access  Enable signing    self-signed        This is due to the  FXML Annotation needing permission to inject the   value from the FXML markup  see   http   docs oracle com javafx 2 fxml get started fxml deployment htm     I was running my App on JDK8u31 and it would never run without the certificate in Chrome   Firefox   IE

User · Answer

You should use getClassLoader   method in your root   Parent root   FXMLLoader load getClass   getClassLoader   getResource  main fxml

User · Answer

I tried above answers and it didn t work in my project  My project was with maven and openjfx in Windows   This solved the problem     FXMLLoader fxmlLoader   new FXMLLoader    fxmlLoader setLocation getClass   getResource   main fxml     root   fxmlLoader load

User · Answer

I couldn t use  getClass   getResource  views view fxml     because I put my controller class into  controllers  package  so here is my solution   getClass   getResource     views view fxml

[java] JavaFX "Location is required." even though it is in the same package

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