QuickFIX/J has limited support for configuring character sets to be used in decoding and encoding messages. However, the use of multibyte characters in FIX messages is not yet officially supported by QuickFIX/J although some users have modified their code to allow it.
By default QuickFIX/J is configured to use the ISO-8859-1 character set. This can
be modified at the JVM level (not per session) by using the