Is JOptionPane internationalized ?

[Bharat]

Hi folks,   I am testing my software for internationalization (Japanese) on w2k and solaris. I am using JOptionPane for warning dialogs, error dialogs etc. On Japanese W2k machine the "OK", "Cancel".. buttons are displayed in Japanese but on Japanese solaris machine they are still displayed in english. I am using jre1.3. Are there any registered bug for this? I saw some bugs but they all are closed.   Thanks - bharat