To allow multiple character sets to be sent from the client, the UTF-8 encoding should be used, either by configuring utf8 as the default server character set, or by configuring the JDBC driver to use UTF-8 through the characterEncoding property. MySQL database should be created in single-byte encoding, e.g. "latin1":

CREATE DATABASE db1 CHARACTER SET latin1 COLLATE latin1_general_cs;

eXo JCR application (e.g. GateIn) should use JCR dialect "MySQL-UTF8".

In other words: MySQL database default encoding and JCR dialect cannot be UTF8 both. Use single-byte encoding (e.g. "latin1") for database and "mysql-utf8" dialect for eXo JCR.

Notice: "MySQL-UTF8" dialect cannot be auto-detected, it should be set explicitly in configuration.