12.2.2. Seam component

@Scope(ScopeType.SESSION)
@Name("bookingList")
class BookingListAction implements Serializable
{
    @In EntityManager em
    @In User user
    @DataModel List<Booking> bookings
    @DataModelSelection Booking booking
    @Logger Log log

    @Factory 
    public void getBookings()
    {
        bookings = em.createQuery('''
        select b from Booking b
        where b.user.username = :username
        order by b.checkinDate''').
            setParameter("username", user.username).
            getResultList()
    }
        
    public void cancel()
    {
        log.info("Cancel booking: #{bookingList.booking.id} 
                 for #{user.username}")
        Booking cancelled = em.find(Booking.class, booking.id)
        if (cancelled != null) em.remove( cancelled )
           getBookings()
           FacesMessages.instance().add("Booking cancelled for confirmation 
                                         number #{bookingList.booking.id}", 
                                         new Object[0])
    }
}

@Scope(ScopeType.SESSION)
@Name("bookingList")
class BookingListAction implements Serializable
{
    @In EntityManager em
    @In User user
    @DataModel List<Booking> bookings
    @DataModelSelection Booking booking
    @Logger Log log

    @Factory 
    public void getBookings()
    {
        bookings = em.createQuery('''
        select b from Booking b
        where b.user.username = :username
        order by b.checkinDate''').
            setParameter("username", user.username).
            getResultList()
    }
        
    public void cancel()
    {
        log.info("Cancel booking: #{bookingList.booking.id} 
                 for #{user.username}")
        Booking cancelled = em.find(Booking.class, booking.id)
        if (cancelled != null) em.remove( cancelled )
           getBookings()
           FacesMessages.instance().add("Booking cancelled for confirmation 
                                         number #{bookingList.booking.id}", 
                                         new Object[0])
    }
}