ubuntu 11 app tray

[Vladimir Korennoy]

Hi all!
I'm trying to add my application to tray in ubuntu 11, but no luck!
Set 'all' to systray-whitelist - no difference.
In Java (with usual getSystemTray() method) it throws an AWTException : 
couldn't display TrayIcon.
In Python there's no error, but no effect too..

Is there something new about app tray I should know/read in ubuntu 11?

Any help or pointing to the right direction wil be appreciated!
Thanks in advance.
Vladimir K.