Question

Consider the following code:

@Entity
@Table(name = "a")
public class A implements Serializable
{
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name="id")
    public int id;

    @Transient
    public B b;

    public B getB()
    {
        return B;
    }
}

When I fetch A, I’m manually filling B (another hibernate entity). If I try and access by by using a.b, then it fails, but, if I user a.getB(); then it succeeds.

Why is this?

Answer 1

1. Class members should ever be private!
2. If your object is attached to the Hibernate Session, you’re working on a proxy. So, if you like to access your class member directly (which is bad!), you have to detach the object first.