Vaadin Rendering issue for Unicode Charset

Hi mates, myself using vaadin framework 7 for webapplications, In my project i have some of the logs have an unicode chars like ‘�’,
in console its printed like symbols, but rendring that value into UI it has value like ‘fffd’. I tried many solutions from google,
but i cant get the Solution. if does anyone has an solution please kindly help.Thanks in Advance.

The log is like below.

<14>1 2018-05-25T11:54:55.502+00:00 - java 11428 AUDIT - �fffd�fffd�fffd11:54:55,502 INFO [AUDIT]
(default task-20).