@Entity	
@Table(name = "MYTABLE")
public class MyEntity {

...

@Lob
@Column(name = "Photo")
private byte[] photo = null;

...

}

public byte[] getPhoto(String id) {
	CriteriaBuilder cb = getEntityManager().getCriteriaBuilder();
	CriteriaQuery<byte[]> cq = cb.createQuery(byte[].class);

Root<MyEntity> root = cq.from(MyEntity.class);

cq.select(root.get(MyEntity_.photo))
		.where(cb.equal(root.get(MyEntity_.id), id));

TypedQuery<byte[]> q = getEntityManager().createQuery(cq);

return q.getSingleResult();

}