I18n for JOptionPane

I have a JOptionPane with OK/Cancel options.
I change the Default Locale when i need to change the app language.
It's alright when I change the default Locale the first time..the Ok and Cancel are shown in the appropriate language...(in the JOptionPane)
but when i'm changing the Locale the second time say back to English....it doesn't work....
I have done no Locale changes in the JOptionPane code....
using current;y JDK 1.4.1_02
Win/Mac
Any suggestions...!

I have observed that when launching an application from the command line using the -Duser.region= and -Duser.language= arguments, that any JOptionPane dialogs one's application might show shall always display their text using that language and locale no matter whether your program should call Locale.setDefault(), System.setProperty(), UIManager.setLookAndFeel(UIManager.getLookAndFeel()), or anything else you may try, at runtime. On the other hand, I have observed that if you launch your application WITHOUT having set those properties on the command line, then Locale.setDefault() and UIManager.setLookAndFeel(UIManager.getLookAndFeel()) will successfully cause JOptionPane to display all of its text using the "current" locale. This is true for the Windows, Motif and Metal look and feels on both Mac and Windows, under JDK 1.4 and 1.5. On Mac OS X however, the "Mac OS X" look and feel will "switch" (pun intended) to the current locale irrespective of whether or not the user.language and user.region system properties were set on the command line at launch time. This, I assume, is an instance of Macintosh "doing the right thing" for the end user despite what Java's designers may have had in mind...
To be frank, I would appreciate an authoritative answer from someone at Sun on this issue, as to whether or not the behavior I have described is intended -- and if so, why -- or whether it is a bug, or whether I have overlooked some salient fact in the Java documentation that I have no excuse for having overlooked.
Thank you for your time,
JL

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I18n for JOptionPane

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