5.6. ロギング

private static final Log log = LogFactory.getLog(CreateOrderAction.class);
 
public Order createOrder(User user, Product product, int quantity) { 
  if ( log.isDebugEnabled() ) { 
    log.debug("Creating new order for user: " + user.username() + 
              " product: " + product.name() + " quantity: " + quantity);
  } 
  return new Order(user, product, quantity); 
}

@Logger private Log log; 

public Order createOrder(User user, Product product, int quantity) { 
  log.debug("Creating new order for user: #0 product: #1 quantity: #2", 
             user.username(), product.name(), quantity); 
          
  return new Order(user, product, quantity); 
}

@Logger private Log log; 
public Order createOrder(User user, Product product, int quantity) { 
  log.debug("Creating new order for user: #{user.username} 
             product: #{product.name} quantity: #0", quantity); 
  return new Order(user, product, quantity); 
}