Turkish character set is included in ISO-8859-9. Hibernate uses toLowerCase/toUpperCase method to generate sql queries. But when you lowered the character "I" to lowercase it turns to "ı" (spotless i) and hibernate generated queries doesnt works. In mozilla plugin lots of thing has been changed since beta 2 and i think this problem is related with this issue. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4112746#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...