[EJB3] Problème avec OneToMany

Bonjour

J'ai un soucis à la création d'un OneToMany dans une entity.
Classe Portfolio :

Code:

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@Entity
public class Portfolio {
 
	@Id
	private Integer id;
 
	private User user;
 
	@ManyToOne
	@JoinColumn(name = "user_fk")
	public User getUser(){
		return user;
	}
 
	public void setUser(User user){
		this.user = user;
	}
 
	public void setId(Integer id) {
		this.id = id;
	}
 
	public Integer getId() {
		return id;
	}

Classe User :

Code:

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@Entity
public class User {
 
	@Id
	private Integer id;
 
	private Collection<Portfolio> portfolios;
	@OneToMany(mappedBy = "user")
	public Collection<Portfolio> getPortfolios(){
		return portfolios;
	}
 
	public void setPortfolios(Collection<Portfolio> portfolios){
		this.portfolios = portfolios;
	}
 
	public void setId(Integer id) {
		this.id = id;
	}
 
	public Integer getId() {
		return id;
	}

Message d'erreur :

Citation:

error due to the following reason(s): org.hibernate.MappingException: Could not determine type for: java.util.Collection, at table: User, for columns: [org.hibernate.mapping.Column(portfolios)]

Merci d'avance pour votre aide.