For lazy relationship how to specify a fetch join that can force a eager loading in JPA?

@Entity
public EntityA implements Serializable {
    ...
    @OneToOne(fetch=FetchType.LAZY)
    private Entity开发者_高级运维B b;
    ...
}

How do i dynamically load the EntityB eagerly?

Using a query:

select a from EntityA a left join fetch a.b where a.id = :id