The font property files for the chinese locales have to be updated for mercury. The following files need to be updated:
font.properties.zh_CN.Sun,
font.properties.zh_CN_UTF8.Sun,
font.properties.zh_HK.Sun,
font.properties.zh_HK_UTF8.Sun,
font.properties.zh_TW.Sun,
font.properties.zh_TW_UTF8.Sun

The updated files can be taken from mercury beta.