Let's try first with UTF-8:
Change dbencoding to UTF-8, as well the "encoding" key in SystemGlobals.properties (take a look at jforum-custom.conf as well).
Make sure "dbunicode" is "true".
Test. If it doesn't work, try setting all encodings to GB2312, and a mix of "dbunicode" to "true" or "false".
Sometimes it can be hard to find the right configuration, because the OS encoding may interfer on the process.
Rafael
[originally posted on jforum.net by Rafael Steil]