Reproducer for https://hibernate.atlassian.net/browse/HHH-14590
== Join not rendered when requested for embedded in secondary table if a single column is selected using the Criteria API
Related Spring Data issue: spring-projects/spring-data-jpa#2209
Given the following entities
@SecondaryTable(name = "secondary")
@Entity
public class RootEntity {
@Id
@GeneratedValue
Long id;
String rootValue;
@Embedded
PlainEmbeddable plainEmbeddable;
@Embedded
SecondTableEmbeddable secondaryEmbeddable;
}
@Embeddable
public class PlainEmbeddable {
String plainName;
String plainValue;
}
@Embeddable
public class SecondTableEmbeddable {
@Column(table = "secondary")
String secName;
@Column(table = "secondary")
String secValue;
}
This query fails because it renders a SQL statement with a missing join:
CriteriaBuilder builder = em.getCriteriaBuilder();
CriteriaQuery<Long> query = builder.createQuery(Long.class);
Root<RootEntity> root = query.from(RootEntity.class);
Join<Object, Object> join = root.join("secondaryEmbeddable");
Path<Object> name = join.get("secName");
query.select(root.get("id")).where(builder.equal(name, "secondary"));
em.createQuery(query).getSingleResult();
The rendered select is (Note the missing join and the wrong table used for secName):
select
rootentity0_.id as col_0_0_
from
RootEntity rootentity0_
where
rootentity0_1_.secName=?
The following variants work fine:
Embeddable not stored in secondary table
CriteriaBuilder builder = em.getCriteriaBuilder();
CriteriaQuery<Long> query = builder.createQuery(Long.class);
Root<RootEntity> root = query.from(RootEntity.class);
Join<Object, Object> join = root.join("plainEmbeddable"); // <<=== !!!!!!!!
Path<Object> name = join.get("plainName");
query.select(root.get("id")).where(builder.equal(name, "primary"));
em.createQuery(query).getSingleResult();
Selecting the full entity
CriteriaBuilder builder = em.getCriteriaBuilder();
CriteriaQuery<RootEntity> query = builder.createQuery(RootEntity.class);
Root<RootEntity> root = query.from(RootEntity.class);
Join<Object, Object> join = root.join("secondaryEmbeddable");
Path<Object> name = join.get("secName");
query.select(root).where(builder.equal(name, "secondary")); // <<=== !!!!!!!!
em.createQuery(query).getSingleResult();
Using a path instead of a join
CriteriaBuilder builder = em.getCriteriaBuilder();
CriteriaQuery<Long> query = builder.createQuery(Long.class);
Root<RootEntity> root = query.from(RootEntity.class);
Path<Object> path = root.get("secondaryEmbeddable"); // <<=== !!!!!!!!
Path<Object> name = path.get("secName");
query.select(root.get("id")).where(builder.equal(name, "secondary"));
em.createQuery(query).getSingleResult();
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