I have a little Java project where I've set the properties of the class files to UTF-8 (I use a lot of foreign characters not found on the default CP1252).

The goal is to create a text file (in Windows) containing a list of items. When running the class files from Eclipse itself (hitting Ctrl+F11) it creates the file flawlessly and opening it in another editor (I'm using Notepad++) I can see the characters as I wanted.

+--------------------------------------------------+
¦                          Universidade2010 (18/18)¦
¦                                         hidden: 0¦
+--------------------------------------------------¦

But, when I export the project (using Eclipse) as a runnable Jar and run it using 'javaw -jar project.jar' the new file created is a mess of question marks

????????????????????????????????????????????????????
?                          Universidade2010 (19/19)?
?                                         hidden: 0?
????????????????????????????????????????????????????

I've followed some tips on how to use UTF-8 (which seems to be broken by default on Java) to try to correct this so now I'm using

Writer w = new OutputStreamWriter(fos, "UTF-8");

and writing the BOM header to the file like in this question already answered but still without luck when exporting to Jar

Am I missing some property or command-line command so Java knows I want to create UTF-8 files by default ?