One aspect of JBoss Seam is its RAD (Rapid Application Development) capability. While not synonymous with RAD, one interesting tool in this space is dynamic languages. Until recently, choosing a dynamic language was required choosing a completely different development platform (a development platform with a set of APIs and a runtime so great that you would no longer want to use you old legacy Java [sic] APIs anymore, which would be lucky because you would be forced to use those proprietary APIs anyway). Dynamic languages built on top of the Java Virtual Machine, and Groovy in particular broke this approach in silos.

JBoss Seam now unites the dynamic language world with the Java EE world by seamlessly integrating both static and dynamic languages. JBoss Seam lets the application developer use the best tool for the task, without context switching. Writing dynamic Seam components is exactly like writing regular Seam components. You use the same annotations, the same APIs, the same everything.

    @Entity

    @Name("hotel")

    class Hotel implements Serializable

    {

        @Id @GeneratedValue

        Long id


        @Size(max=50) @NotNull

        String name


        @Size(max=100) @NotNull

        String address


        @Size(max=40) @NotNull

        String city


        @Size(min=2, max=10) @NotNull

        String state


        @Size(min=4, max=6) @NotNull

        String zip


        @Size(min=2, max=40) @NotNull

        String country


        @Column(precision=6, scale=2)

        BigDecimal price


        @Override

        String toString()

        {

            return "Hotel(Seam Reference Guide,${address},${city},${zip})"

        }

    }

@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])

    }

}