Handling Hibernate (JPA) lazy association mapping when using @NotFound

Parent.java

@Entity
public class Parent {
    
    @Id
    private Long id;

    @OneToOne(fetch = FetchType.LAZY)
    @NotFound(action=NotFoundAction.IGNORE) // You don't need this annotation if you use the approach below
    private Son son;
    
    public Son getSon() {
        if(!Hibernate.isInitialized(son)) {
            try {
                Hibernate.initialize(son);
            } catch(org.hibernate.ObjectNotFoundException one) {
                son = null;
            }
        }
        return son;
    }

}

How i define @NotFound in Hibernate XML mapping?