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javaintellij-ideagradlejava-8illegalstateexception

Can't load resource, always returns null

I have the following problem:

I am developing a Java 8 Application with IntelliJ IDEA 15 using JavaFX as GUI and Gradle as build automation system (never worked with Gradle before though). I always get an IllegalStateException "Location is not set" when loading the fxml file, the reason is because getClass().getResource("gui.fxml") always returns null.

My Java Code:

package minerva.gui;

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 {

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

    @Override
    public void start(Stage primaryStage) throws Exception {
        System.out.println(getClass().getResource("gui.fxml")==null); // DEBUG: always returns true, but why?

        FXMLLoader loader = new FXMLLoader(getClass().getResource("gui.fxml"));
        Parent root = (Parent) loader.load();
        primaryStage.setTitle("Minerva");
        primaryStage.setScene(new Scene(root));
        Controller control = loader.getController();
        primaryStage.show();
    }
}

Maybe Gradle is responsible for this, I don't know.

build.gradle:

group 'minerva.impl'
version '1.0-SNAPSHOT'

apply plugin: 'java'

sourceCompatibility = 1.5

repositories {
    mavenCentral()
}

dependencies {
    compile 'org.hsqldb:hsqldb:2.3.1'
    testCompile group: 'junit', name: 'junit', version: '4.11'
}

settings.gradle:

rootProject.name = 'minerva'

I also checked the resource patterns in the settings of IntelliJ, they should be valid: !?.java;!?.form;!?.class;!?.groovy;!?.scala;!?.flex;!?.kt;!?.clj;!?*.aj

And here is also an image of my structure: Link to the image

Solution

  • Gradle has a similar project structure as maven and seperates between sources and resources. Ressources should be put into src/main/resources.

    Move your gui.fxml file into the resource folder and it should be found.

    Your resulting artifacts are placed in $PROJECT/target and if you have similar problems in the future, it is a good idea to look into your jar,war,ear or what ever archive in order to see, if the files are packed up as expected.