please change the field type to tinyint(1), and try again:) Hibernate maps the java Boolean data to bit(1) in MySQL, which should uses tinyint(1) as the type. There are 4 fields need to change: alter table jbp_instance modify modifiable tinyint(1) not null; alter table jbp_portlet_state_entry modify read_only tinyint(1) not null; alter table jbp_users modify jbp_viewrealemail tinyint(1); alter talbe jbp_users modify jbp_enabled tinyint(1); View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3975968#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...