JavaEE 6:EJB3.1新特性

	@javax.ejb.Lock(WRITE)
	public class ChatRoom { 
	
	   private java.util.Map<User,Collection<String>> userComments; 
	
	   @PostConstruct 
	   public void setup (){ 
	     userComments = new java.util.concurrent.ConcurrentHashMap<User,Collection<String>>(); 
	     /* ...*/
	   }
	   public void join(User usr){ /* ...*/ }
	   public void disconnect(User usr){  /* ...*/ }
	   public void say(String msg){ /* ...*/  }
	
	   @javax.ejb.Lock(READ)
	   public int getCountOfActiveUsers(){ /* ... run through the map and count ... */ } 
	}
	

	@javax.ejb.Singleton 
	public class ChatRoom {
	
	   private java.util.Map<User,Collection<String>> userComments;
	        
	   @javax.ejb.Schedule(minute="1", hour="*") 
	   public void cleanOutOldDataFromChatLogs() { 
	      /** ... not reprinting all the existing code ... */
	   }
	} 
	

	public CarHotelAndAirLineBookingServiceBean implements CarHotelAndAirLineBookingService  {
	  @javax.ejb.Asynchronous  
	  public Future<BookingConfirmation> bookCarHotelAndAirLine( Car rental, Hotel hotel, AirLine airLine) { 
	    /**  ...  */
	   } 
	 }
	
	  //客戶端程式碼
	
	  public BookingAction { 
	
	        @javax.ejb.EJB  private  CarHotelAndAirLineBookingServiceBean bookingService; 
	
	        private Future<BookingConfirmation> confirmation;
	
	        public String makeRequest(){ 
	
	                Hotel hotelSelection = ... ;
	                Car rentalSelection = ... ;
	                AirLine airLineSelection = ... ; 
	
	                confirmation = bookingService.bookCarHotelAndAirLine(
	                    rentalSelection, hotelSelection, airLineSelection ) ; 
	                return "showConfirmationPending";
	        }
	
	        public Future<BookingConfirmation> getConfirmation(){ /* ... */ }
	
	        /* ... */
	}