如何从JPA中的数据库中检索字节数组

Question

@Entity
public class MyImage implements Serializable {

    @Id 
    @Column(nullable = false, length = 20)
    private long id;
    @Lob
    private byte[] picture;

    public MyImage(long id, byte[] picture) {
        this.id = id;
        this.picture = picture;
    }

    public MyImage() {
    }

}