title: Can not refresh not managed object
body: <p>I've to refresh a list of <code>Eleve</code> from the database to a Jtable. 
  The <code>Jtable</code> it's self is bound to an observable <code>list&lt; Eleve &gt;</code>, so any add/delete to the list is automatically updated in the <code>Jtable</code>.</p>
  
  <p>My code explain it's self:</p>
  
  <pre><code>EleveJpaController ejc = new EleveJpaController(emf);
  java.util.Collection&lt;Eleve&gt; data = ejc.findEleveByNiveauClasseNomPrenom(niv, classe, nom, prenom);
  
  for (Eleve entity : data) {
      entityManager.refresh(entity);
  }
  
  list.clear();
  list.addAll(data);
  </code></pre>
  
  <p>List&lt; Eleve > findEleveByNiveauClasseNomPrenom(a,v,x,n):</p>
  
  <pre><code> public List&lt;Eleve&gt; findEleveByNiveauClasseNomPrenom(String niv,String classe,String nom, String prenom)
      {
          EntityManager em = getEntityManager();
          Query qr= em.createQuery("SELECT e FROM Eleve e WHERE e.niv.niv like '%"+niv+"%' and e.class1.libelle like '%"+classe+"%' and e.nom like '%"+nom+"%' and e.prenom like '%"+prenom+"%'");
  
         return qr.getResultList(); 
      }
  </code></pre>
  
  <p>As you can see, It's well manged list of <code>Eleve</code> objects.. So why this exception is thrown ?</p>
  
  <pre><code>[EL Info]: 2013-12-02 13:25:33.312--ServerSession(1903253526)--EclipseLink, version: Eclipse Persistence Services - 2.3.0.v20110604-r9504
  [EL Info]: 2013-12-02 13:25:35.005--ServerSession(1903253526)--file:/C:/Users/marwen/Documents/NetBeansProjects/JocondeFinale/build/classes/_JocondeFinalePU login successful
  Exception in thread "AWT-EventQueue-0" java.lang.IllegalArgumentException: Can not refresh not managed object: entities.Eleve[ idEleve=7 ].
      at org.eclipse.persistence.internal.jpa.EntityManagerImpl.refresh(EntityManagerImpl.java:943)
      at org.eclipse.persistence.internal.jpa.EntityManagerImpl.refresh(EntityManagerImpl.java:849)
      at entities.GestionPaiement.niveauJcbbxItemStateChanged(GestionPaiement.java:736)
      at entities.GestionPaiement.access$2000(GestionPaiement.java:32)
      at entities.GestionPaiement$FormListener.itemStateChanged(GestionPaiement.java:607)
      at javax.swing.JComboBox.fireItemStateChanged(JComboBox.java:1225)
      at javax.swing.JComboBox.selectedItemChanged(JComboBox.java:1273)
      at javax.swing.JComboBox.contentsChanged(JComboBox.java:1329)
      at javax.swing.AbstractListModel.fireContentsChanged(AbstractListModel.java:118)
      at javax.swing.DefaultComboBoxModel.setSelectedItem(DefaultComboBoxModel.java:94)
      at javax.swing.JComboBox.setSelectedItem(JComboBox.java:578)
      at javax.swing.JComboBox.setSelectedIndex(JComboBox.java:624)
      at javax.swing.plaf.basic.BasicComboPopup$Handler.mouseReleased(BasicComboPopup.java:835)
      at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:290)
      at java.awt.Component.processMouseEvent(Component.java:6505)
      at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
      at javax.swing.plaf.basic.BasicComboPopup$1.processMouseEvent(BasicComboPopup.java:499)
      at java.awt.Component.processEvent(Component.java:6270)
      at java.awt.Container.processEvent(Container.java:2229)
      at java.awt.Component.dispatchEventImpl(Component.java:4861)
      at java.awt.Container.dispatchEventImpl(Container.java:2287)
      at java.awt.Component.dispatchEvent(Component.java:4687)
      at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
      at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)
      at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
      at java.awt.Container.dispatchEventImpl(Container.java:2273)
      at java.awt.Window.dispatchEventImpl(Window.java:2719)
      at java.awt.Component.dispatchEvent(Component.java:4687)
      at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:735)
      at java.awt.EventQueue.access$200(EventQueue.java:103)
      at java.awt.EventQueue$3.run(EventQueue.java:694)
      at java.awt.EventQueue$3.run(EventQueue.java:692)
      at java.security.AccessController.doPrivileged(Native Method)
      at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
      at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
      at java.awt.EventQueue$4.run(EventQueue.java:708)
      at java.awt.EventQueue$4.run(EventQueue.java:706)
      at java.security.AccessController.doPrivileged(Native Method)
      at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
      at java.awt.EventQueue.dispatchEvent(EventQueue.java:705)
      at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
      at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
      at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
      at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
      at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
      at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
  </code></pre>
  
  <p>Cheers.</p>