If you go to you database now (say through psql) and issue the query anonymous wrote : select nextval ('postmaster_sequence') I'm betting it would not be 51 and will probably be 2. anonymous wrote : 2006-07-27 16:09:40,004 DEBUG [org.hibernate.SQL] - select nextval ('postmaster_sequence') | 2006-07-27 16:09:40,043 DEBUG [org.hibernate.id.SequenceGenerator] - Sequence identifier generated: | 1 It looks like the postgres sequence returned 1. But the SequenceHiLoGenerated inserted a value of 50. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3961422#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...