Comment 5 for bug 472845

I am pretty sure this is related, someone had reported a test in Ubuntu Chinese forum, OpenJDK behaves differently when hard-coding different Chinese fonts in the fontconfig.properties file. The full report (in Chinese) can be seen here:
http://forum.ubuntu.com.cn/viewtopic.php?f=8&t=270097&sid=c14bc70002ab07beb8786498467c8f5a

the test screenshot is shown from this link:
http://forum.ubuntu.com.cn/download/file.php?id=102213&sid=c14bc70002ab07beb8786498467c8f5a&mode=view/test.png

The broken one at the bottom is "WenQuanYi Zen Hei". The one next to it is "WenQuanYi Zen Hei Mono". I suspect that the wrong metrics is related to the embedded bitmaps.