It is a short time that I'm studying Spring,I'm a student I have problems with dependency injection. In this project I have this error code in the method acquista.Why? Acquista in english is translated in "buy".If my Carrello (cart) is composed by more than one Articolo(Article) , in ArticoliOrdine(ArticlesOrder) I have only the first of them.Why?How can I solve it?
Error code:
Grave: Servlet.service() for servlet [applicationContext] in context with path [/SpringStore] threw exception [Request processing failed; nested exception is javax.persistence.PersistenceException: org.hibernate.PersistentObjectException: detached entity passed to persist: bean.Ordine] with root cause
org.hibernate.PersistentObjectException: detached entity passed to persist: bean.Ordine
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:139)
at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:75)
at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:811)
at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:784)
at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:789)
at org.hibernate.jpa.spi.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:1181)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:289)
at com.sun.proxy.$Proxy37.persist(Unknown Source)
at daoJPA.CarrelloDAOImpl.acquista(CarrelloDAOImpl.java:130)
CarrelloDAOImpl.java
@Transactional
public class CarrelloDAOImpl implements CarrelloDAO {
@PersistenceContext
private EntityManager em;
@Autowired
Carrello carrello;
@Autowired
private ArticoliOrdine articoliOrdine;
@Autowired
private Ordine ordine;
public void acquista(Cliente c){
ordine.setIdCliente(c);
ordine.setData(new Date(System.currentTimeMillis()));
ordine.setStato("In lavorazione");
em.persist(ordine);
Set<String> lista_articoli=carrello.getMappa_Articoli().keySet();
synchronized(lista_articoli){
Iterator<String> it=lista_articoli.iterator();
while(it.hasNext()){
String codice=it.next();
System.out.println("codice: "+codice);
Query q=em.createQuery("SELECT a FROM Articolo a WHERE a.codice =:codice");
q.setParameter("codice", codice);
Articolo a =(Articolo)q.getSingleResult();
ArticoliOrdinePK pk=articoliOrdine.getArticoliordinePK();
pk.setIdArticolo(a.getId());
pk.setIdOrdine(ordine.getId());
articoliOrdine.setArticolo(a);
articoliOrdine.setQuantita(carrello.getMappa_Articoli().get(codice));
em.persist(articoliOrdine);
//aggiorno la quantita' dell'articolo
Articolo articolo_update=em.find(Articolo.class,a.getId());
articolo_update.setQuantita(articolo_update.getQuantita()- articoliOrdine.getQuantita());
}//while
}//syncronized
}//acquista
}//CarrelloDAOImpl
Ordine.java
@Table(name="ordine")
@Entity
public class Ordine implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
@Column(name="id")
private Integer id;
@Temporal(TemporalType.TIMESTAMP)
@Column(name="data")
private Date data;
@Column(name="stato")
private String stato;
@ManyToOne(optional=false)
@JoinColumn(name="idCliente",referencedColumnName="id")
private Cliente idCliente;
@OneToMany(mappedBy="ordine",cascade=CascadeType.ALL,fetch=FetchType.LAZY)
Collection<ArticoliOrdine> articoliordineCollection;
public Ordine() {
}
public Ordine(Integer id) {
this.id = id;
}
public Ordine(Integer id, Date data, String stato) {
this.id = id;
this.data = data;
this.stato = stato;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public Date getData() {
return data;
}
public void setData(Date data) {
this.data = data;
}
public String getStato() {
return stato;
}
public void setStato(String stato) {
this.stato = stato;
}
public Cliente getIdCliente() {
return idCliente;
}
public void setIdCliente(Cliente idCliente) {
this.idCliente = idCliente;
}
public Collection<ArticoliOrdine> getArticoliordineCollection() {
return articoliordineCollection;
}
public void setArticoliordineCollection(
Collection<ArticoliOrdine> articoliordineCollection) {
this.articoliordineCollection = articoliordineCollection;
}
@Override
public boolean equals(Object o){
if(! (o instanceof Ordine) )
return false;
Ordine ordine=(Ordine)o;
return ordine.id==this.id;
}//equals
public String toString(){
return id+" cliente:"+idCliente.getId();
}//toString
}//Ordine
CarrelloController.java
@Controller
public class CarrelloController {
@Autowired
CarrelloDAO carrelloDAO;
@Autowired
Carrello carrello;
...
@RequestMapping(value="/acquista",method=RequestMethod.POST)
public String acquista(HttpServletRequest request,ModelMap model){
HttpSession session=request.getSession();
Cliente cliente=(Cliente)session.getAttribute("cliente");
carrelloDAO.acquista(cliente);
carrello.svuotaCarrello();
model.addAttribute("num_articoli",carrello.contaArticoliCarrello());
model.addAttribute("totale_carrello",carrello.getTotale());
return "redirect:/";
}//checkOut
}//CarrelloController
ApplicationContext.xml
<bean class="daoJPA.ClienteDAOImpl" id="clienteDAO"/>
<bean class="daoJPA.ArticoloDAOImpl" id="articoloDAO"/>
<bean class="bean.Carrello" id="carrello" scope="session">
<aop:scoped-proxy/>
</bean>
<bean class="daoJPA.CarrelloDAOImpl" id="carrelloDAO"/>
<bean class="bean.ArticoliOrdine" id="articoliOrdine" scope="prototype">
<property name="articoliordinePK">
<bean class="bean.ArticoliOrdinePK" id="articoliOrdinePK" scope="prototype"/>
</property>
</bean>
<bean class="bean.Ordine" id="ordine" scope="prototype"/>
