Question

In my UserTbl entity, I have this

@OneToOne( cascade = CascadeType.REMOVE, mappedBy = "user", fetch=FetchType.EAGER )
private RetailPostUserTbl retailPostUser;

@OneToOne( cascade = CascadeType.REMOVE, mappedBy = "user", fetch=FetchType.EAGER )
private BackOfficeUserTbl backOfficeUser;

But both are ALWAYS null.

A user must belong to at least one of them or both but the query always return null.

I tried fetching it via the criteria api like this

    Root<UserTbl> root = cq.from( UserTbl.class );
    root.fetch( UserTbl_.retailPostUser, JoinType.LEFT );
    root.fetch( UserTbl_.backOfficeUser, JoinType.LEFT );

But they are still always null.

Any ideas why this is not working?

The reverse works fine, for eg

in RetailPostUserTbl, this works

@OneToOne( optional = false, cascade=CascadeType.REMOVE )
@PrimaryKeyJoinColumn
private UserTbl user;

Answer 1

You must be doing something wrong while saving or retrieving the entity, for @OneToOne mapping the FetchType is by default EAGER and you don’t have to mention it explicitly.
Have you tried to load the entity by –

entityManager.find();

if above method works and returns the entity with all the mapped objects then check your criteria query.