@Entity
public T1{
	@Id
	@Column(name="id")
	int id;
	
	@Column(name="name")
	String name;
	
	@JoinColumn(name = "parentId")
	@OneToOne()
	T1 parentT1;	
}

@Entity
public class T1{
	@Id
	@Column(name = "id")
	public String id;
		
	@Column(name = "NAME")
	public String name;
		
	@JoinColumn(name = "PARENT_id")
	@OneToOne(fetch = FetchType.EAGER)
	public T1 parentT1;	
}


CriteriaBuilder cb = em.getCriteriaBuilder();
CriteriaQuery<?> cq = cb.createQuery(T1.class);
Root<?> root = cq.from(T1.class);
Selection<?>[] select = new Selection[]{root.get("id"),root.get("name"),root.get("parentT1").get("id"),root.get("parentT1").get("name")};
//cq.multiselect(select);  <-----  ok if comment 
Query query = em.createQuery(cq);
((org.eclipse.persistence.jpa.JpaQuery<?>)query).getDatabaseQuery().dontMaintainCache();
List<T1> listT1=query.getResultList();
for (T1 t12 : listT1) {
 System.out.println(t12.id+" "+t12.name+" "+t12.parentT1.id+" "+t12.parentT1.name);			
}