JavaFX Error with Netbeans Standard FXML application - Nullpointer for .fxml file

Question

When I create a new Netbeans Projekt (JavaFX FXML Application) with application class I receive a template as usual (one .fxml, one controller class and the main application). When I try to run this I get an exception:

Exception in thread "main" java.lang.RuntimeException: Exception in Application start method
    at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:403)
    at com.sun.javafx.application.LauncherImpl.access$000(LauncherImpl.java:47)
    at com.sun.javafx.application.LauncherImpl$1.run(LauncherImpl.java:115)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException: Location is required.
    at javafx.fxml.FXMLLoader.load(FXMLLoader.java:2825)
    at javafx.fxml.FXMLLoader.load(FXMLLoader.java:2809)
    at javafx.fxml.FXMLLoader.load(FXMLLoader.java:2795)
    at javafx.fxml.FXMLLoader.load(FXMLLoader.java:2782)
    at javafx.fxml.FXMLLoader.load(FXMLLoader.java:2771)
    at volltextsuche.Volltextsuche.start(Volltextsuche.java:25)
    [...]

This is my start() method:

@Override
public void start(Stage stage) throws Exception {
    URL url = getClass().getResource("FXMLDocument.fxml");
    System.out.println(url == null);
    Parent root = FXMLLoader.load(getClass().getResource("FXMLDocument.fxml"));
    Scene scene = new Scene(root);
    stage.setScene(scene);
    stage.show();
}

and somehow the URL is null. Line 25 is the Parent root = [...] part. The .fxml document has the exact same name as the Strings tell and is in the same package as the main application class. I didn't change anything, just the null check for the URL. I googled for a long time, but I couldn't find anything regarding this error.

JDK 8.0_45
Netbeans 8.0.2
Win 8.1 x64

IDE with project

Is the FXML file in the same package as the Application class whose code you showed? — James_D
– James_D, Commented May 6, 2015 at 17:23
Yes it is. Sadly the URL is instantly null and I'm not able to print the path... — Matthias Brück
– Matthias Brück, Commented May 6, 2015 at 17:28
Can you see if the FXML is deployed along with the class files to wherever it is that Netbeans deploys its class files? (I'm not a NetBeans user, but I understand that sometimes it needs coercing to deploy resources other than class files from the source folders.) — James_D
– James_D, Commented May 6, 2015 at 17:40
Good hint, for some reason the log says Compiling 1 source file to D:\NetbeansProjects\Volltextsuche\build\classes and just the main application file got compiled. Not even the controller class. But I really have no clue why. — Matthias Brück
– Matthias Brück, Commented May 6, 2015 at 17:44
I compiled the controller manually, but the error stays the same (I can't compile the .fxml). — Matthias Brück
– Matthias Brück, Commented May 6, 2015 at 17:46

Community · Accepted Answer · 2017-05-23 10:30:59Z

1

Ok, I found the error, see here. The error is differnent but the solution is the same. I found a broken reference to dist.jar in my project settings. As the answered question in the link states I had to CLEAN and build the project for the first build. The broken reference got fixed by that. I deleted all already compiled files and now the compiler does everything needed and compiles the whole project.

edited May 23, 2017 at 10:30

CommunityBot

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answered May 6, 2015 at 18:00

Matthias Brück

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Comments

devil_io · Accepted Answer · 2016-05-05 00:17:06Z

0

This is sort of a temporary solution that works.

First copy the resource to the same directory as src folder.

So if your src folder path is C:app/src , then copy all resources to C :app

Run the application again.

answered May 5, 2016 at 0:17

devil_io

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