Hi.
First of all, sorry for my english :D
I am newby using seam and I am trying to develope a web application with a MVC
layer model (I have no choose, I didn't design the application).
I am some confused about what annotations a need for each layer and I can't
find any example that implements this model. Anyone can help me?:
Entity:
| @Entity
| @Name("libro")
| @Scope(CONVERSATION)
| @Table(name = "libros")
| public class Libro implements Serializable {
|
| private static final long serialVersionUID = -1252025299985845136L;
|
| private String isbn;
|
| private String titulo;
|
| private String autor;
|
| @Id
| @Column(name = "isbn")
| public String getIsbn() {
| return isbn;
| }
|
| public void setIsbn(String isbn) {
| this.isbn = isbn;
| }
|
| @NotNull
| @Column(name = "titulo")
| public String getTitulo() {
| return titulo;
| }
|
| public void setTitulo(String titulo) {
| this.titulo = titulo;
| }
|
| @NotNull
| @Column(name = "autor")
| public String getAutor() {
| return autor;
| }
|
| public void setAutor(String autor) {
| this.autor = autor;
| }
| }
|
Service Interface:
| @Local
| public interface LibroManager {
| ...
| public void add();
| ...
| }
|
Service Implementation:
| @Stateful
| @Name("libroManager")
| @Scope(CONVERSATION)
| public class LibroManagerAction implements LibroManager, Serializable {
|
| private static final long serialVersionUID = 4607492839166551543L;
|
| @In(required = false)
| @Out(required = false)
| private Libro libro;
|
| private LibroDAOhbn libroDAO = new LibroDAOhbn();
|
| ...
| public void add() {
| libroDAO.Create(libro);
| }
| ...
| }
|
Dao Interface:
| @Local
| public interface LibroDAO {
| public void Create(Libro libro);
|
| }
|
Dao Implementation:
| @Stateless
| @Name("libroDAO")
|
| public class LibroDAOhbn implements LibroDAO {
|
| @PersistenceContext
| private EntityManager em;
|
| public void Create(Libro libro) {
| System.out.println("Registrando " + libro.getTitulo());
|
| try {
| em.persist(libro);
| } catch (Exception e) {
| System.out.println(e.getMessage());
| }
| }
|
| }
|
Ok, when the Create(libro) method is called, I only get an exception: NULL. I
think that this is caused because I lost the EntityManager or Entity context,
but I don't know how to mend it.
I try to inject the libroDAOhbn in the service class with:
| @In (create=true)
| private LibroDAOhbn libroDAO = new LibroDAOhbn();
|
but I get an error everytime I call any service's method. I think that it must
to have an easy solution, but I can't find it :). Some suggestions?
If I don't use a DAO layer and I do all the implementation in the
service/controller , I have no problems. This runs perfectly:
| @Stateful
| @Name("libroManager")
| @Scope(CONVERSATION)
| public class LibroManagerAction implements LibroManager, Serializable {
|
| private static final long serialVersionUID = 4607492839166551543L;
|
| @In(required = false)
| @Out(required = false)
| private Libro libro;
|
| private LibroDAOhbn libroDAO = new LibroDAOhbn();
|
| ...
| public void add() {
|
| try {
| em.persist(libro);
|
| FacesMessages.instance().add( "Insertado correctamente: " +
libro.getTitulo());
|
| } catch (Exception e) {
| System.out.println("Exception: " + e.getMessage());
| }
| ....
| }
|
but I need the DAO's :(
Thank's for all.
PS: Sorry for my englis again.
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