[java] JavaFX Location is not set error message

I've stumbled upon the same problem. Program was running great from Eclipse via "Run" button, but NOT from runnable JAR which I'd exported before. My solution was:

1) Move Main class to default package

2) Set other path for Eclipse, and other while running from the JAR file (paste this into Main.java)

public static final String sourcePath = isProgramRunnedFromJar() ? "src/" : "";
public static boolean isProgramRunnedFromJar() {
    File x = getCurrentJarFileLocation();
    if(x.getAbsolutePath().contains("target"+File.separator+"classes")){
        return false;
    } else {
        return true;
    }
}
public static File getCurrentJarFileLocation() {
        try {
            return new File(Main.class.getProtectionDomain().getCodeSource().getLocation().toURI().getPath());
        } catch(URISyntaxException e){
            e.printStackTrace();
            return null;
        }
}

And after that in start method you have to load files like this:

FXMLLoader loader = new FXMLLoader(getClass().getResource(sourcePath +"MainScene.fxml"));

It works for me in Eclipse Mars with e(fx)clipse plugin.

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