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Re: [eclipselink-users] NullPointerException returned using a StoredProcedureCall class
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My guess is that getActiveSession is null because you are not in a
transaction. But looking at the line number in your stack trace would
confirm it.
Try using getSession, or,
em.unwrap(JpaEntityManager).createQuery(query).getSingleResult();
Oggie wrote:
>
>
> Hi,
>
>
>
> I am developing a JPA, EJB and JSF 2.0 web app. I persist an entity
> PedidoUsuario and after it I want to get its PK in
>
> the corresponding table ALMACEN.PEDIDO_USUARIO. To persist the entity I
> use an special EJB that calls another EJBs.
>
>
>
> Here is the EJB,
>
> @Stateless
> @TransactionManagement(TransactionManagementType.CONTAINER)
> public class ManejadorPedido {
>
> @PersistenceContext(unitName = "AlmacenJPA")
> private EntityManager em;
> @Resource
> private SessionContext context;
> @EJB
> private PedidoUsuarioFacade pedidoUsuarioFacade;
> @EJB
> private PiezaPedidaFacade piezaPedidaFacade;
> @EJB
> private ObtenerMaxIdPedidoUsuario obtenerMaxIdPedidoUsuario;
>
> @TransactionAttribute(TransactionAttributeType.REQUIRED)
> public long placeOrder(Usuario usuario, ShoppingCart cart) {
>
> try {
> //Usuario usuario = addUsuario(nombre, apellidos, email,
> telefono, username, password);
> PedidoUsuario pedido = addPedido(usuario, cart);
> long orderId = obtenerMaxIdPedidoUsuario.ObtenerMaxId();
> addPedidoItems(orderId, cart);
> return orderId;
> } catch (Exception e) {
> e.printStackTrace();
> context.setRollbackOnly();
> return 0L;
> }
> }
>
> /*
> private Usuario addUsuario(String nombre, String apellidos, String
> email, String telefono, String username, String password) {
>
> Usuario usuario = new Usuario();
> usuario.setNombre(nombre);
> usuario.setApellidos(apellidos);
> usuario.setEmail(email);
> usuario.setTelefono(telefono);
> usuario.setUsername(username);
> usuario.setPassword(password);
>
> em.persist(usuario);
> return usuario;
> }
> */
>
> private PedidoUsuario addPedido(Usuario usuario, ShoppingCart cart) {
>
> // set up customer order
> PedidoUsuario order = new PedidoUsuario();
> order.setIdUsuario(new BigDecimal(usuario.getIdUsuario()));
> java.util.Date utilDate = Calendar.getInstance().getTime();
> java.sql.Date sqlDate = new java.sql.Date(utilDate.getTime());
> order.setFechaPedido(sqlDate);
> cart.calculateTotal();
> order.setTotal(BigDecimal.valueOf(cart.getTotal()));
>
> // create confirmation number
> Random random = new Random();
> int i = random.nextInt(999999999);
> order.setNumeroConfirmacion(new BigDecimal(i));
>
> //em.persist(order);
> pedidoUsuarioFacade.create(order);
> return order;
> }
>
> private void addPedidoItems(long orderId, ShoppingCart cart) {
>
> //em.flush();
>
> List<ShoppingCartItem> items = cart.getItems();
>
> // iterate through shopping cart and create OrderedProducts
> for (ShoppingCartItem scItem : items) {
>
> long idPieza = scItem.getPieza().getIdPieza();
>
> // set up primary key object
> PiezaPedidaPK piezaPedidaPK = new PiezaPedidaPK();
> piezaPedidaPK.setIdPedidousuario(orderId);
> piezaPedidaPK.setIdPieza(idPieza);
>
> // create ordered item using PK object
> PiezaPedida itemPedido = new PiezaPedida();
> itemPedido.setId(piezaPedidaPK);
>
> // set quantity
> itemPedido.setCantidad(new BigDecimal(scItem.getCantidad()));
>
> //em.persist(itemPedido);
> piezaPedidaFacade.create(itemPedido);
> }
> }
>
> }
>
> The problem is in the method placeOrder(Usuario
> usuario, ShoppingCart cart) when I try to get the PK of the persisted
> PedidoUsuario.
>
> For it I use an EJB that implements a StoredProcedureCall class. Why? The
> reason why is that if I use JPQL, being the PK type of sequence,
>
> it returns a wrong PK. So I guessed it could be resolved attacking the
> database directly.
>
>
>
> Here is the EJB,
>
>
>
> @Stateless
> public class ObtenerMaxIdPedidoUsuario implements Serializable {
>
> private static final long serialVersionUID = 1L;
>
> /**
> * Default constructor.
> */
> public ObtenerMaxIdPedidoUsuario() {
> // TODO Auto-generated constructor stub
> }
>
> public long ObtenerMaxId() throws Exception {
>
> final Logger logger =
> Logger.getLogger("ObtenerMaxIdPedidoUsuario");
>
> EntityManagerFactory emf =
> Persistence.createEntityManagerFactory("AlmacenJPA");
> EntityManager em = emf.createEntityManager();
>
> try {
>
> JpaEntityManager jpaEntityManager =
> JpaHelper.getEntityManager(em);
> Session session = jpaEntityManager.getActiveSession();
> StoredProcedureCall call = new StoredProcedureCall();
>
> call.setProcedureName("ALMACEN.OBTENER_MAX_ID_PEDIDO_USUARIO");
> call.addNamedOutputArgument("RESULT");
>
> ValueReadQuery query = new ValueReadQuery();
> query.setCall(call);
>
> return (Long)session.executeQuery(query);
>
> } catch (Exception ex) {
> logger.severe("ERROR: " + ex.getMessage());
> throw ex;
> }
> }
>
> }
>
> being the Oracle SP as follows,
>
>
> CREATE OR REPLACE PROCEDURE ALMACEN.OBTENER_MAX_ID_PEDIDO_USUARIO (result
> OUT NUMBER)
> IS
> BEGIN
> SELECT MAX(ID_PEDIDOUSUARIO) INTO result
> FROM PEDIDO_USUARIO;
> EXCEPTION
> WHEN NO_DATA_FOUND THEN
> result := 0;
> END;
> /
>
> But it fails. The EJB method ObtenerMaxId() returns a
> NullPointerException.
>
>
>
> Maybe I am wrong in the code of the SP or maybe in the EJBs, I do not
> know.
>
>
>
> Please help.
>
>
-----
http://wiki.eclipse.org/User:James.sutherland.oracle.com James Sutherland
http://www.eclipse.org/eclipselink/
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