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Entity mapping not working as expected for non-PK referencedColumnName in JoinColumn

See original GitHub issue


In an entity, I have a @ManyToOne mapping with a non-PK referencedColumnName and I’m trying to map the target entity into an entity view. Here is an attempt to simplify the setup:

public class Cat {
    private Long id;
    private String name;
    @JoinColumn(referencedColumnName = "code")
    private CatFood favoriteFood;

public class CatFood extends AbstractBaseEntity implements Serializable
    private Long id;
    @Column(nullable = false, unique = true)
    private Long code;
    private String brand;
public interface CatView
    Long getId();
    String getName();
    CatFood getFavoriteFood();   

---------- ------------ -----------------
         1 Lucy           23
         2 Tom             1
         3 Kitty                                                                               

        ID BRAND        CODE
---------- ------------ ----------
         1 Whiskas           23
         2 Purina             1

Expected behavior

When the entity is queried directly, the favorite food should be loaded:

Cat cat = cbf.create(em, Cat.class).where("id").eq(2L).getSingleResult();
assertThat(cat.getFavoriteFood(), is(not(nullValue())));
assertThat(cat.getFavoriteFood().getBrand(), is("Purina"));

When the entity view is queried, the favorite food should also be loaded:

CriteriaBuilder<Cat> cb = cbf.create(em, Cat.class).where("id").eq(2L);
CriteriaBuilder<CatView> viewBuilder = evm.applySetting(EntityViewSetting.create(CatView.class), cb);
CatView catView = viewBuilder.getSingleResult();
assertThat(catView .getFavoriteFood(), is(not(nullValue())));
assertThat(catView .getFavoriteFood().getBrand(), is("Purina"));

Actual behavior

When querying the Cat entity directly, the behavior is as expected. For the catView though, getFavoriteFood() returns null.

Worse, in my original and much more complex setup the method corresponding to getFavoriteFood() in this example returns the wrong entity if the “food code” in the FK column matches another row with an “id” of the same value. Unfortunately, I couldn’t reproduce this exact behavior with the simplified setup.


Version: 1.6.3 JPA-Provider: Hibernate 5.5.7.Final DBMS: Oracle Application Server: Apache Tomcat, Spring Framework

Issue Analytics

  • State:closed
  • Created 2 years ago
  • Comments:8 (4 by maintainers)

github_iconTop GitHub Comments

cgraefecommented, Nov 10, 2021

Thanks again for your help and effort!

Ultimately, it will be better to use entity views all the way though because you can then fully control what is fetched and how, which entities not necessarily allow in all cases.

Generally, I agree! In my particular case, I am using Blaze Persistence to improve a large existing code base with some parts dating back more than 10 years. Being able to (at least temporarily) map entities into views is a nice feature that allows for a more gradual refactoring, imho.

cgraefecommented, Nov 22, 2021

Good to know, at least. Thanks for looking into this!

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