Could you upgrade the version of MySQL used? I can try to but that might take me couple of days since I'm not a MySQL guru
Is the activitystream_events table correctly set up with utf8 encoding? Are the other tables using InnoDB or MyISAM? I have attached the file http://xwiki.475771.n2.nabble.com/file/n6884313/XwikiDatabaseCollationsAndEn... XwikiDatabaseCollationsAndEngines.txt with engines/collations/encodings information. All of tables are on UTF8 but it turns out that all tables of my XWiki use 'MyISAM' engine except for 'activitystream_events_params' which uses 'InnoDB'. I have a strong feeling that's not how it should have been. Can this issue be also related to changing the hibernate dialect from 'org.hibernate.dialect.MySQLDialect' to 'org.hibernate.dialect.MySQL5InnoDBDialect'?
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