Hello , I'am a beginner in EJB 3. configuration: JBOSS 4 + EJB 3. Oracle. procedure: 1\ I persist and object in database (Oracle) using entitymanager. (primary key generate AUTO) 2\ I add manually an object in database unsing JDBC (increment last primary key genrate by 1) 3\ I try to persist and other object in database using entitymanger but i obtain a primary key violation. How synchronize entityManager' ID with database after adding an object manually ? (I have try Flush() but it don't work) What is the best way to generate primary key if i use Oracle ? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3959805#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...