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You need to configure you database to support those characters.Check out how to add support for UTF-8 and UTF-16 character in your database.Just do that and restart the server.
create database alfresco WITH ENCODING 'UTF8';
Yes, I was using the mysql db where we need to do changed in some configuration file and it works fine.I am sure that was UTF-16 or UTF-8.The other thing is your JSP files should also have some tag which specifies the support for the same encoding.