@Entity
@EntityListeners({MessageHistory.class})
@Table(name = "MESSAGE")
@XmlRootElement
@NamedQueries({
 public class Message implements Serializable {

public class MessageHistory{
  @Inject
   private MessageLogFacade logFacade;
   
   private MessageLog messageLog;
    
    @PostPersist
    @PostUpdate
    public void prePersist(Message message) {
       
        messageLog = new MessageLog(message);
        logFacade.create(messageLog);
        
    }
}

@Stateless
public class MessageLogFacade extends AbstractFacade<MessageLog> {
    @PersistenceContext(unitName = "WebPU")
    private EntityManager em;

    @Override
    protected EntityManager getEntityManager() {
        return em;
    }

    public MessageLogFacade () {
        super(MessageLog.class);
    }
    
}

   public static BeanManager getMessageLogFacade() {
        try {
            InitialContext initialContext = new InitialContext();
            return (MessageLogFacade) initialContext.lookup("java:comp/MessageLogFacade");
        } catch (NamingException e) {
            e.printStackTrace();
            return null;
        }
    }