hi al, can u explain the strategy us described reviously anonymous wrote : | 2) Don't specify the PK; dont set the ID | Given the ID in the debtor class is an int. | public void setId(int id) { | this.id = id; | } | | I have a question 1) The default value with be '0'. How does the entitymanager.merge differenciate between '0' default and a debtor.setId(0)? I can see how it can identified as 'null' by using a Integer object instead of an int. many thanks -lp View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3982261#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...