JDK-8003228 fixed a problem on OS X with filenames containing non-ASCII characters. For instance, such files would not show up in file chooser dialogs under certain circumstances (launching via webstart or double-clicked .jars, or from the Terminal with LANG=C). Post-8003228, the sun.jnu.encoding property is always set to UTF-8 on Mac OS X.
The problem remains that once the file is loaded, non-ASCII characters *contained* in files do not display correctly. This is due to the "file.encoding" property being set to US-ASCII for apps launched with webstart.