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java - JavaFX: Could not find or load main class only on linux

I've developed a program in Windows with Java(FX) using Intellij Idea and that worked just fine, I then exported the artifact (jar) and there was no problem running it on Windows (both with the console and double clicking it).

I've then copied it to my Ubuntu VM, but there it says

Error: Could not find or load main class sample.Main

This is the Manifest:

Manifest-Version: 1.0
Main-Class: sample.Main

The JAR file structure looks like this:

test.jar
--- META-INF
--- --- MANIFEST.MF
--- org
--- --- json
--- --- --- // json library
--- sample
--- --- Contacts.class
--- --- Controller.class
--- --- Main.class
--- --- sample.fxml
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Ubuntu, like Debian, has a separate package for OpenJFX (OpenJDK's implementation of JavaFX). Why this is the case, when JavaFX is an integral part of the JRE - I do not know, but your problem should be solved by installing the OpenJFX package:

# aptitude install openjfx  

(or using any other package manager), or by using Oracle's JRE.


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