JavaFX desktop app can't read files

Question

Hi!
I have a javaFX application with Java and JavaFX mixed code what works fine when I start it using : javafx -cp ... appClass
But when I try to start it using: javaws app.jnpl it doesn't work (Main stage does not displayed)
I found that app silently fails at first disk access: somewhere like that
  File folder = new File(".");
  File[] listOfFiles = folder.listFiles();
  for (int i = 0; i < listOfFiles.length; i++) {... in Java class
or that :
design.label.text= new File("test").getAbsolutePath();in Java.fx class
I never used Java Web Start before.If that is a web start access limitation or restriction is there any way to bypass it?
Thank you.

Answer 1

It's probably the case.
Modify the options of Java in the control panel to automatically display the Java Console when starting a program or an applet so you can try to see any uncaught exception. You'll probably get a SecurityException or an IllegalAccess.
You'll then need to change your JNLP to request all permissions and to sign you app (see Java Web Start documentation on how to generate a temporary certificate - also NetBeans can do that for you, have a look at the project's settings).