I tried to do this with this piece of code:
JFileChooser chooser = new JFileChooser();
int retval = JFileChooser.CANCEL_OPTION;
chooser.setFileSelectionMode( JFileChooser.DIRECTORIES_ONLY);
retval = chooser.showDialog(null, "Select");
But it didn't work. Console just waited for input...
You need to run it as java -jar exported.jar