The logs mention a possible transaction timeout on the operation that is being performed. However, the actual cause might be related to locks on the database table on which the operation is being carried out. Have you looked at the database table to check whether the table gets locked as part of this operation(Your DBA might be able to help you for checking the locks on tables)? Also, since you mention this occurs when multiple users try to perform the operation, i suspect it might have to do with the database table getting locked and subsequently leading to some sort of a deadlock. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3979875#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...