Is there a way to run a -.jar file (created with javaFx) without displaying anything(GUI, progressbar, …)?

Question

I wrote a java file including javaFX. Now, I want to run this file, like java -jar example.jar But I'd like to suppress the graphical output. Is there any possible, like a flag or anything else, to do this? My program normally shows a progressbar and after that a video of the simulation.

Thanks a lot.

Answer 1

To elaborate on JB Nizet 's comment. JAR files have manifests. In order to run your JAR using the command java -jar example.jar , the manifest must have a Main-Class entry. And your main class must have a main() method.

So launch your app like so...

java -jar example.jar NO_GUI

And in your main() method, write something like the following...

public static void main(String[] args) {
    if (args.length > 0  &&  "NO_GUI".equals(args[0]) {
        // Don't show GUI
    }
    else {
        // Show the GUI.
    }
}

Answer 2

你可以在场景上调用hide() ，这样窗口就会消失。

Answer 3

There is not really a way to force this.

Instead, implement it as feature. Create a command line argument nogui and react to it:

public static void main(String[] args) {
    boolean useGui = true;
    if (args.length > 0 && args[0].equals("nogui")) {
        doNotUseGui = false;
    }

    // Create your program and give it the flag
    Program prog = new Program(useGui);
    ...
}

Note that theoretically it would be possible to hack your application and remove any such calls, or to suppress the calls on a native level. But I guess that is not really the route you want to go.