I have a class that contains a Date property - timestamp. Also, I have a form for persisting this object in the database. This form was created by the seam generator. In the database the timestamp is not nullable. The timestamp should be equal to a current time. A user should not insert it. So I removed this field from the form and changed the setter for this property public void setTimestamp(Date time) { if (time==null) { timestamp = new Date(); } this.timestamp = time; } However, the persisting mechanism does not use this setter. As a result I am getting the exception: Exception during request processing: javax.servlet.ServletException: #{projNotesHome.persist}: javax.persistence.PersistenceException: org.hibernate.PropertyValueException: not-null property references a null or transient value: : com.scea.spot4.ProjNotes.timestamp Any suggestion? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4035180#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...